diff --git a/package-lock.json b/package-lock.json
index 2df0bec840..aee3116f4b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5152,13 +5152,11 @@
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@@ -5167,13 +5165,11 @@
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@@ -5212,13 +5204,11 @@
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@@ -5227,13 +5217,11 @@
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       "license": "MIT",
       "optional": true,
       "os": [
         "freebsd"
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+      ]
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@@ -5242,13 +5230,11 @@
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         "linux"
-      ],
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+      ]
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@@ -5257,13 +5243,11 @@
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       "optional": true,
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         "linux"
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+      ]
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@@ -5272,13 +5256,11 @@
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       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
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+      ]
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@@ -5287,13 +5269,11 @@
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-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
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     "node_modules/@rollup/rollup-linux-loong64-gnu": {
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@@ -5302,13 +5282,11 @@
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-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
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     "node_modules/@rollup/rollup-linux-loong64-musl": {
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@@ -5317,13 +5295,11 @@
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       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
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     "node_modules/@rollup/rollup-linux-ppc64-gnu": {
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@@ -5332,13 +5308,11 @@
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       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
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     "node_modules/@rollup/rollup-linux-ppc64-musl": {
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@@ -5347,13 +5321,11 @@
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       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
-      ],
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+      ]
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     "node_modules/@rollup/rollup-linux-riscv64-gnu": {
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@@ -5362,13 +5334,11 @@
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       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-riscv64-musl": {
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@@ -5377,13 +5347,11 @@
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       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-s390x-gnu": {
       "version": "4.59.0",
@@ -5392,13 +5360,11 @@
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       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
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     "node_modules/@rollup/rollup-linux-x64-gnu": {
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@@ -5407,13 +5373,11 @@
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         "x64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-linux-x64-musl": {
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@@ -5422,13 +5386,11 @@
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         "x64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "linux"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-openbsd-x64": {
       "version": "4.59.0",
@@ -5437,13 +5399,11 @@
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         "x64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "openbsd"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-openharmony-arm64": {
       "version": "4.59.0",
@@ -5452,13 +5412,11 @@
       "cpu": [
         "arm64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "openharmony"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-win32-arm64-msvc": {
       "version": "4.59.0",
@@ -5467,13 +5425,11 @@
       "cpu": [
         "arm64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "win32"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-win32-ia32-msvc": {
       "version": "4.59.0",
@@ -5482,13 +5438,11 @@
       "cpu": [
         "ia32"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "win32"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-win32-x64-gnu": {
       "version": "4.59.0",
@@ -5497,13 +5451,11 @@
       "cpu": [
         "x64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "win32"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rollup/rollup-win32-x64-msvc": {
       "version": "4.59.0",
@@ -5512,13 +5464,11 @@
       "cpu": [
         "x64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
         "win32"
-      ],
-      "peer": true
+      ]
     },
     "node_modules/@rtsao/scc": {
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@@ -11289,7 +11239,6 @@
       "os": [
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@@ -11307,7 +11256,6 @@
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-      "peer": true,
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         "node": ">=18"
       }
@@ -11325,7 +11273,6 @@
       "os": [
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-      "peer": true,
       "engines": {
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@@ -11343,7 +11290,6 @@
       "os": [
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         "node": ">=18"
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@@ -11361,7 +11307,6 @@
       "os": [
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-      "peer": true,
       "engines": {
         "node": ">=18"
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@@ -11379,7 +11324,6 @@
       "os": [
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@@ -11397,7 +11341,6 @@
       "os": [
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@@ -11415,7 +11358,6 @@
       "os": [
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@@ -11433,7 +11375,6 @@
       "os": [
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       "engines": {
         "node": ">=18"
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@@ -11451,7 +11392,6 @@
       "os": [
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-      "peer": true,
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         "node": ">=18"
       }
@@ -11469,7 +11409,6 @@
       "os": [
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-      "peer": true,
       "engines": {
         "node": ">=18"
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@@ -11487,7 +11426,6 @@
       "os": [
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-      "peer": true,
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@@ -11505,7 +11443,6 @@
       "os": [
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-      "peer": true,
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@@ -11523,7 +11460,6 @@
       "os": [
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-      "peer": true,
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         "node": ">=18"
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@@ -11541,7 +11477,6 @@
       "os": [
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-      "peer": true,
       "engines": {
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@@ -11559,7 +11494,6 @@
       "os": [
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-      "peer": true,
       "engines": {
         "node": ">=18"
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@@ -11577,7 +11511,6 @@
       "os": [
         "linux"
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-      "peer": true,
       "engines": {
         "node": ">=18"
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@@ -11595,7 +11528,6 @@
       "os": [
         "netbsd"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -11613,7 +11545,6 @@
       "os": [
         "netbsd"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -11631,7 +11562,6 @@
       "os": [
         "openbsd"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -11649,7 +11579,6 @@
       "os": [
         "openbsd"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -11667,7 +11596,6 @@
       "os": [
         "openharmony"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -11685,7 +11613,6 @@
       "os": [
         "sunos"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -11703,7 +11630,6 @@
       "os": [
         "win32"
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-      "peer": true,
       "engines": {
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       }
@@ -11721,7 +11647,6 @@
       "os": [
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-      "peer": true,
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@@ -11739,7 +11664,6 @@
       "os": [
         "win32"
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-      "peer": true,
       "engines": {
         "node": ">=18"
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@@ -13398,7 +13322,6 @@
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
       "integrity": "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==",
-      "dev": true,
       "hasInstallScript": true,
       "license": "MIT",
       "optional": true,
@@ -25369,6 +25292,7 @@
         "@netlify/api": "^14.0.19",
         "@netlify/headers-parser": "^9.0.3",
         "@netlify/redirect-parser": "^15.0.4",
+        "@sindresorhus/transliterate": "^1.6.0",
         "chalk": "^5.0.0",
         "cron-parser": "^4.1.0",
         "deepmerge": "^4.2.2",
@@ -25407,6 +25331,18 @@
         "node": ">=18.14.0"
       }
     },
+    "packages/config/node_modules/@sindresorhus/transliterate": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/@sindresorhus/transliterate/-/transliterate-2.3.1.tgz",
+      "integrity": "sha512-gVaaGtKYMYAMmI8buULVH3A2TXVJ98QiwGwI7ddrWGuGidGC2uRt4FHs22+8iROJ0QTzju9CuMjlVsrvpqsdhA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "packages/config/node_modules/@types/node": {
       "version": "18.19.130",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-18.19.130.tgz",
diff --git a/packages/build/tests/core/snapshots/tests.js.md b/packages/build/tests/core/snapshots/tests.js.md
index b960cebcb0..6e53343bcd 100644
--- a/packages/build/tests/core/snapshots/tests.js.md
+++ b/packages/build/tests/core/snapshots/tests.js.md
@@ -806,6 +806,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/build/tests/core/fixtures/basereldir/_headers",␊
diff --git a/packages/build/tests/core/snapshots/tests.js.snap b/packages/build/tests/core/snapshots/tests.js.snap
index 82c05655b4..c758b6c648 100644
Binary files a/packages/build/tests/core/snapshots/tests.js.snap and b/packages/build/tests/core/snapshots/tests.js.snap differ
diff --git a/packages/build/tests/monitor/snapshots/tests.js.md b/packages/build/tests/monitor/snapshots/tests.js.md
index d224593613..c314462d5b 100644
--- a/packages/build/tests/monitor/snapshots/tests.js.md
+++ b/packages/build/tests/monitor/snapshots/tests.js.md
@@ -70,6 +70,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "buildCommand": "node --invalid",␊
         "buildCommandOrigin": "config",␊
         "configPath": "packages/build/tests/monitor/fixtures/command/netlify.toml"␊
@@ -212,6 +213,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "event": "load",␊
         "packageName": "./plugin.js",␊
         "input": "test",␊
@@ -308,6 +310,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "event": "load",␊
         "packageName": "./plugin.js",␊
         "loadedFrom": "local",␊
@@ -396,6 +399,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "event": "onPreBuild",␊
         "packageName": "./plugin.js",␊
         "loadedFrom": "local",␊
@@ -484,6 +488,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "event": "onPreBuild",␊
         "packageName": "./plugin.js",␊
         "loadedFrom": "local",␊
@@ -572,6 +577,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "event": "onPreBuild",␊
         "packageName": "./plugin.js",␊
         "loadedFrom": "local",␊
@@ -647,6 +653,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "event": "onPreBuild",␊
         "packageName": "./plugin.js",␊
         "loadedFrom": "local",␊
@@ -739,6 +746,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "event": "onPreBuild",␊
         "packageName": "./plugin.js",␊
         "loadedFrom": "local",␊
@@ -832,6 +840,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "error",␊
       "unhandled": true,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/test",␊
         "endpoint": "cancelSiteDeploy",␊
         "parameters": {␊
           "deploy_id": "test"␊
@@ -1040,6 +1049,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "buildCommand": "node --invalid",␊
         "buildCommandOrigin": "config",␊
         "configPath": "packages/build/tests/monitor/fixtures/command/netlify.toml"␊
@@ -1120,6 +1130,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "buildCommand": "node --invalid",␊
         "buildCommandOrigin": "config",␊
         "configPath": "packages/build/tests/monitor/fixtures/command/netlify.toml"␊
@@ -1199,6 +1210,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "buildCommand": "node --invalid",␊
         "buildCommandOrigin": "config",␊
         "configPath": "packages/build/tests/monitor/fixtures/command/netlify.toml"␊
@@ -1286,6 +1298,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "event": "onPreBuild",␊
         "packageName": "./plugin.js",␊
         "loadedFrom": "local",␊
@@ -1373,6 +1386,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "event": "onPreBuild",␊
         "packageName": "./plugin.js",␊
         "loadedFrom": "local",␊
@@ -1461,6 +1475,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "event": "onPreBuild",␊
         "packageName": "./plugin.js",␊
         "loadedFrom": "local",␊
@@ -1612,6 +1627,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "format": "eszip",␊
         "runtime": "deno",␊
         "functionType": "edge"␊
@@ -1690,6 +1706,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "bundler": "esbuild",␊
         "functionName": "trouble",␊
         "runtime": "js"␊
@@ -1781,6 +1798,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "functionName": "trouble",␊
         "runtime": "rs"␊
       },␊
@@ -1856,6 +1874,7 @@ Generated by [AVA](https://avajs.dev).
       "severity": "info",␊
       "unhandled": false,␊
       "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0",␊
         "bundler": "esbuild",␊
         "functionName": "trouble",␊
         "runtime": "js"␊
diff --git a/packages/build/tests/monitor/snapshots/tests.js.snap b/packages/build/tests/monitor/snapshots/tests.js.snap
index b90e6a3e0e..3bfaf729ac 100644
Binary files a/packages/build/tests/monitor/snapshots/tests.js.snap and b/packages/build/tests/monitor/snapshots/tests.js.snap differ
diff --git a/packages/build/tests/telemetry/snapshots/tests.js.md b/packages/build/tests/telemetry/snapshots/tests.js.md
index 58dc8aea3d..24c6766447 100644
--- a/packages/build/tests/telemetry/snapshots/tests.js.md
+++ b/packages/build/tests/telemetry/snapshots/tests.js.md
@@ -96,6 +96,9 @@ Generated by [AVA](https://avajs.dev).
       "groupingHash": "Telemetry error/nResponse code: 0",␊
       "severity": "error",␊
       "unhandled": true,␊
+      "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0"␊
+      },␊
       "pluginPackageJson": false,␊
       "BUILD_ID": "0",␊
       "other": {␊
@@ -418,6 +421,9 @@ Generated by [AVA](https://avajs.dev).
       "groupingHash": "Telemetry error/nThe operation was aborted due to timeout",␊
       "severity": "error",␊
       "unhandled": true,␊
+      "location": {␊
+        "buildLogs": "https://app.netlify.com/sites/site-name/deploys/0"␊
+      },␊
       "pluginPackageJson": false,␊
       "BUILD_ID": "0",␊
       "other": {␊
diff --git a/packages/build/tests/telemetry/snapshots/tests.js.snap b/packages/build/tests/telemetry/snapshots/tests.js.snap
index 38d2b9c5f2..3dfb955c48 100644
Binary files a/packages/build/tests/telemetry/snapshots/tests.js.snap and b/packages/build/tests/telemetry/snapshots/tests.js.snap differ
diff --git a/packages/config/package.json b/packages/config/package.json
index d3a2ef3d2e..3a68305d20 100644
--- a/packages/config/package.json
+++ b/packages/config/package.json
@@ -62,6 +62,7 @@
     "@netlify/api": "^14.0.19",
     "@netlify/headers-parser": "^9.0.3",
     "@netlify/redirect-parser": "^15.0.4",
+    "@sindresorhus/transliterate": "^1.6.0",
     "chalk": "^5.0.0",
     "cron-parser": "^4.1.0",
     "deepmerge": "^4.2.2",
diff --git a/packages/config/src/env/main.ts b/packages/config/src/env/main.ts
index 4a8cab1608..514bc9cafd 100644
--- a/packages/config/src/env/main.ts
+++ b/packages/config/src/env/main.ts
@@ -1,11 +1,18 @@
 import type { NetlifyAPI } from '@netlify/api'
+import transliterate from '@sindresorhus/transliterate'
 import omit from 'omit.js'
+import { env } from 'node:process'
 
 import { removeFalsy } from '../utils/remove_falsy.js'
 
 import { getEnvelope } from './envelope.js'
 import { getGitEnv } from './git.js'
 
+const NETLIFY_DEFAULT_DOMAIN = '.netlify.app'
+// `site.name` is `undefined` when there is no token or siteId
+const DEFAULT_SITE_NAME = 'site-name'
+const DEFAULT_SITE_ID = '00000000-0000-0000-0000-000000000000'
+
 // Retrieve this site's environment variable. Also take into account team-wide
 // environment variables.
 // The buildbot already has the right environment variables. This is mostly
@@ -111,8 +118,8 @@ const getGeneralEnv = async function ({
   const gitEnv = await getGitEnv(buildDir, branch)
   const deployUrls = getDeployUrls({ siteInfo: siteInfo as $TSFixMe, branch, deployId })
   return removeFalsy({
-    SITE_ID: id,
-    SITE_NAME: name,
+    SITE_ID: id ?? DEFAULT_SITE_ID,
+    SITE_NAME: name ?? env.SITE_NAME ?? DEFAULT_SITE_NAME, // env.SITE_NAME used in monitor/tests.js
     DEPLOY_ID: deployId,
     NETLIFY_SKEW_PROTECTION_TOKEN: skewProtectionToken,
     BUILD_ID: buildId,
@@ -150,6 +157,19 @@ const getInternalEnv = function (
   )
 }
 
+/**
+ * Function matching the backend logic to slugify strings
+ * @param str string to slugify
+ * @returns string
+ */
+const slugify = (str: string) =>
+  transliterate(str)
+    .replace(/[-\u2010\u2012\u2013\u2014\u2015\u2043\u2212\u00ad]/g, '-')
+    .toLowerCase()
+    .replace(/[^a-z0-9 ]/g, ' ')
+    .trim()
+    .replace(/ +/g, '-')
+
 const getDeployUrls = function ({
   siteInfo: {
     name = DEFAULT_SITE_NAME,
@@ -160,17 +180,13 @@ const getDeployUrls = function ({
   deployId,
 }) {
   return {
-    URL: sslUrl,
+    URL: sslUrl ?? `https://${name}${NETLIFY_DEFAULT_DOMAIN}`,
     REPOSITORY_URL,
-    DEPLOY_PRIME_URL: `https://${branch}--${name}${NETLIFY_DEFAULT_DOMAIN}`,
+    DEPLOY_PRIME_URL: `https://${slugify(branch)}--${name}${NETLIFY_DEFAULT_DOMAIN}`,
     DEPLOY_URL: `https://${deployId}--${name}${NETLIFY_DEFAULT_DOMAIN}`,
   }
 }
 
-const NETLIFY_DEFAULT_DOMAIN = '.netlify.app'
-// `site.name` is `undefined` when there is no token or siteId
-const DEFAULT_SITE_NAME = 'site-name'
-
 // Environment variables specified by the user
 const getUserEnv = async function ({ api, config, siteInfo, accounts, context }) {
   const accountEnv = await getAccountEnv({ api, siteInfo, accounts, context })
@@ -223,8 +239,12 @@ const READONLY_ENV = [
   'CACHED_COMMIT_REF',
   'COMMIT_REF',
   'CONTEXT',
+  'DEPLOY_ID',
+  'DEPLOY_PRIME_URL',
+  'DEPLOY_URL',
   'HEAD',
   'REPOSITORY_URL',
+  'SITE_ID',
   'URL',
 
   // CI builds set NETLIFY=true while CLI and programmatic builds set
diff --git a/packages/config/tests/api/snapshots/tests.js.md b/packages/config/tests/api/snapshots/tests.js.md
index 9e8d95787c..cddaf33011 100644
--- a/packages/config/tests/api/snapshots/tests.js.md
+++ b/packages/config/tests/api/snapshots/tests.js.md
@@ -130,6 +130,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "hasApi": true,␊
@@ -267,6 +285,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "hasApi": true,␊
@@ -407,6 +443,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "hasApi": true,␊
@@ -550,6 +604,18 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "test"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/api/fixtures/empty/_headers",␊
@@ -693,6 +759,18 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "test"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/api/fixtures/empty/_headers",␊
@@ -1010,6 +1088,18 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "test"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/api/fixtures/empty/_headers",␊
@@ -1147,6 +1237,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "hasApi": true,␊
@@ -1290,6 +1398,18 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "test"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/api/fixtures/empty/_headers",␊
@@ -2044,6 +2164,18 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "test"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/api/fixtures/base/_headers",␊
@@ -2181,6 +2313,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "hasApi": true,␊
@@ -2402,9 +2552,3 @@ Generated by [AVA](https://avajs.dev).
       },␊
       "token": "test"␊
     }`
-
-## Integrations are not returned if failed to fetch integrations
-
-> Snapshot 1
-
-    'Failed retrieving extensions for site test: Unexpected status code 500 from fetching extensions. Double-check your login status with \'netlify status\' or contact support with details of your error.'
diff --git a/packages/config/tests/api/snapshots/tests.js.snap b/packages/config/tests/api/snapshots/tests.js.snap
index ff72afb27c..aae639088d 100644
Binary files a/packages/config/tests/api/snapshots/tests.js.snap and b/packages/config/tests/api/snapshots/tests.js.snap differ
diff --git a/packages/config/tests/base/snapshots/tests.js.md b/packages/config/tests/base/snapshots/tests.js.md
index 450b2061cc..d3d657c566 100644
--- a/packages/config/tests/base/snapshots/tests.js.md
+++ b/packages/config/tests/base/snapshots/tests.js.md
@@ -133,6 +133,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/base/fixtures/default_config/base/_headers",␊
@@ -275,6 +293,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/base/fixtures/prop_config/base/publish/_headers",␊
@@ -413,6 +449,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/base/fixtures/recursive/base/_headers",␊
@@ -555,6 +609,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/base/fixtures/prop_config/publish/_headers",␊
@@ -698,6 +770,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/base/fixtures/base_without_publish/base/_headers",␊
@@ -834,6 +924,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/base/fixtures/base_without_publish/base/_headers",␊
@@ -970,6 +1078,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/base/fixtures/base_without_publish/base/_headers",␊
diff --git a/packages/config/tests/base/snapshots/tests.js.snap b/packages/config/tests/base/snapshots/tests.js.snap
index 11828670cd..557e0b1c4f 100644
Binary files a/packages/config/tests/base/snapshots/tests.js.snap and b/packages/config/tests/base/snapshots/tests.js.snap differ
diff --git a/packages/config/tests/cli/snapshots/tests.js.md b/packages/config/tests/cli/snapshots/tests.js.md
index 11e898c78e..154601b48a 100644
--- a/packages/config/tests/cli/snapshots/tests.js.md
+++ b/packages/config/tests/cli/snapshots/tests.js.md
@@ -179,6 +179,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cli/fixtures/empty/_headers",␊
@@ -325,6 +343,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cli/fixtures/empty/_headers",␊
@@ -464,6 +500,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cli/fixtures/empty/_headers",␊
@@ -486,6 +540,18 @@ Generated by [AVA](https://avajs.dev).
       "integrations": [],␊
       "accounts": [],␊
       "env": {␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
         "DEPLOY_ID": {␊
           "sources": [␊
             "general"␊
@@ -498,6 +564,12 @@ Generated by [AVA](https://avajs.dev).
           ],␊
           "value": "0"␊
         },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
+        },␊
         "DEPLOY_PRIME_URL": {␊
           "sources": [␊
             "general"␊
@@ -742,6 +814,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cli/fixtures/empty/_headers",␊
@@ -884,6 +974,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cli/fixtures/toml/_headers",␊
@@ -1025,6 +1133,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cli/fixtures/toml/_headers",␊
@@ -1166,6 +1292,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cli/fixtures/toml/_headers",␊
diff --git a/packages/config/tests/cli/snapshots/tests.js.snap b/packages/config/tests/cli/snapshots/tests.js.snap
index b3294ed4e7..8528b0ec56 100644
Binary files a/packages/config/tests/cli/snapshots/tests.js.snap and b/packages/config/tests/cli/snapshots/tests.js.snap differ
diff --git a/packages/config/tests/context/snapshots/tests.js.md b/packages/config/tests/context/snapshots/tests.js.md
index 19d1f91adf..d760646086 100644
--- a/packages/config/tests/context/snapshots/tests.js.md
+++ b/packages/config/tests/context/snapshots/tests.js.md
@@ -134,6 +134,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/context_flag/_headers",␊
@@ -273,6 +291,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/context_flag/_headers",␊
@@ -412,6 +448,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/context_default/_headers",␊
@@ -496,7 +550,7 @@ Generated by [AVA](https://avajs.dev).
           "sources": [␊
             "general"␊
           ],␊
-          "value": "https://testBranch--site-name.netlify.app"␊
+          "value": "https://testbranch--site-name.netlify.app"␊
         },␊
         "DEPLOY_URL": {␊
           "sources": [␊
@@ -551,6 +605,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/branch/_headers",␊
@@ -635,7 +707,7 @@ Generated by [AVA](https://avajs.dev).
           "sources": [␊
             "general"␊
           ],␊
-          "value": "https://testBranch--site-name.netlify.app"␊
+          "value": "https://testbranch--site-name.netlify.app"␊
         },␊
         "DEPLOY_URL": {␊
           "sources": [␊
@@ -690,6 +762,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/branch/_headers",␊
@@ -768,7 +858,7 @@ Generated by [AVA](https://avajs.dev).
           "sources": [␊
             "general"␊
           ],␊
-          "value": "https://testBranch--site-name.netlify.app"␊
+          "value": "https://testbranch--site-name.netlify.app"␊
         },␊
         "DEPLOY_URL": {␊
           "sources": [␊
@@ -823,6 +913,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "/tmp-dir/_headers",␊
@@ -950,6 +1058,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "/tmp-dir/_headers",␊
@@ -1092,6 +1218,24 @@ Generated by [AVA](https://avajs.dev).
           ],␊
           "value": "false"␊
         },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
+        },␊
         "one": {␊
           "sources": [␊
             "configFile"␊
@@ -1244,6 +1388,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/array_merge/_headers",␊
@@ -1330,7 +1492,7 @@ Generated by [AVA](https://avajs.dev).
           "sources": [␊
             "general"␊
           ],␊
-          "value": "https://testBranch--site-name.netlify.app"␊
+          "value": "https://testbranch--site-name.netlify.app"␊
         },␊
         "DEPLOY_URL": {␊
           "sources": [␊
@@ -1385,6 +1547,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/priority_merge/_headers",␊
@@ -1528,6 +1708,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/context_reset/_headers",␊
@@ -1664,6 +1862,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/context_edge_functions_build/_headers",␊
@@ -1805,6 +2021,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/context_edge_functions_top/_headers",␊
@@ -1887,7 +2121,7 @@ Generated by [AVA](https://avajs.dev).
           "sources": [␊
             "general"␊
           ],␊
-          "value": "https://feat/test-wildcard--site-name.netlify.app"␊
+          "value": "https://feat-test-wildcard--site-name.netlify.app"␊
         },␊
         "DEPLOY_URL": {␊
           "sources": [␊
@@ -1942,6 +2176,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/branch_wildcard/_headers",␊
@@ -2024,7 +2276,7 @@ Generated by [AVA](https://avajs.dev).
           "sources": [␊
             "general"␊
           ],␊
-          "value": "https://feat/special--site-name.netlify.app"␊
+          "value": "https://feat-special--site-name.netlify.app"␊
         },␊
         "DEPLOY_URL": {␊
           "sources": [␊
@@ -2079,6 +2331,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/branch_wildcard/_headers",␊
@@ -2216,6 +2486,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/branch_wildcard/_headers",␊
@@ -2298,7 +2586,7 @@ Generated by [AVA](https://avajs.dev).
           "sources": [␊
             "general"␊
           ],␊
-          "value": "https://feat/nested/deep-branch--site-name.netlify.app"␊
+          "value": "https://feat-nested-deep-branch--site-name.netlify.app"␊
         },␊
         "DEPLOY_URL": {␊
           "sources": [␊
@@ -2353,6 +2641,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/branch_wildcard/_headers",␊
@@ -2435,7 +2741,7 @@ Generated by [AVA](https://avajs.dev).
           "sources": [␊
             "general"␊
           ],␊
-          "value": "https://feature/new-feature--site-name.netlify.app"␊
+          "value": "https://feature-new-feature--site-name.netlify.app"␊
         },␊
         "DEPLOY_URL": {␊
           "sources": [␊
@@ -2490,6 +2796,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/branch_wildcard/_headers",␊
@@ -2627,6 +2951,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/context/fixtures/branch_wildcard/_headers",␊
diff --git a/packages/config/tests/context/snapshots/tests.js.snap b/packages/config/tests/context/snapshots/tests.js.snap
index 6242bb3bf6..ab0d317d43 100644
Binary files a/packages/config/tests/context/snapshots/tests.js.snap and b/packages/config/tests/context/snapshots/tests.js.snap differ
diff --git a/packages/config/tests/cwd/snapshots/tests.js.md b/packages/config/tests/cwd/snapshots/tests.js.md
index d2b8750fbd..ce79712929 100644
--- a/packages/config/tests/cwd/snapshots/tests.js.md
+++ b/packages/config/tests/cwd/snapshots/tests.js.md
@@ -131,6 +131,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cwd/fixtures/empty/_headers",␊
@@ -267,6 +285,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/_headers",␊
@@ -403,6 +439,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cwd/fixtures/build_base_cwd/base/_headers",␊
@@ -539,6 +593,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cwd/fixtures/build_base_override/subdir/_headers",␊
@@ -674,6 +746,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cwd/fixtures/empty/_headers",␊
@@ -809,6 +899,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cwd/fixtures/empty/_headers",␊
@@ -936,6 +1044,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "/tmp-dir/_headers",␊
@@ -1096,6 +1222,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/cwd/fixtures/build_base_package_json/subdir/_headers",␊
diff --git a/packages/config/tests/cwd/snapshots/tests.js.snap b/packages/config/tests/cwd/snapshots/tests.js.snap
index 9528b89443..7c7ffbaec9 100644
Binary files a/packages/config/tests/cwd/snapshots/tests.js.snap and b/packages/config/tests/cwd/snapshots/tests.js.snap differ
diff --git a/packages/config/tests/env/tests.js b/packages/config/tests/env/tests.js
index ab944ac2d4..727ec1fd13 100644
--- a/packages/config/tests/env/tests.js
+++ b/packages/config/tests/env/tests.js
@@ -277,11 +277,12 @@ test('Sets SITE_ID environment variable', async (t) => {
   t.is(SITE_ID.value, 'test')
 })
 
-test('Does not set SITE_ID environment variable if no flag is provided', async (t) => {
+test('Set default SITE_ID environment variable if no flag is provided', async (t) => {
   const {
     env: { SITE_ID },
   } = await new Fixture('./fixtures/empty').runWithConfigAsObject()
-  t.is(SITE_ID, undefined)
+  t.deepEqual(SITE_ID.sources, ['general'])
+  t.is(SITE_ID.value, '00000000-0000-0000-0000-000000000000')
 })
 
 test('Sets SITE_NAME environment variable', async (t) => {
@@ -294,13 +295,14 @@ test('Sets SITE_NAME environment variable', async (t) => {
   t.is(SITE_NAME.value, 'test-name')
 })
 
-test('Does not set SITE_NAME environment variable if offline', async (t) => {
+test('Set default SITE_NAME environment variable if offline', async (t) => {
   const {
     env: { SITE_NAME },
   } = await new Fixture('./fixtures/empty')
     .withFlags(AUTH_FLAGS_OFFLINE)
     .runConfigServerAsObject(SITE_INFO_RESPONSE_ENV)
-  t.is(SITE_NAME, undefined)
+  t.deepEqual(SITE_NAME.sources, ['general'])
+  t.is(SITE_NAME.value, 'site-name')
 })
 
 test('Sets URL environment variable', async (t) => {
diff --git a/packages/config/tests/load/snapshots/tests.js.md b/packages/config/tests/load/snapshots/tests.js.md
index c3228ffd57..99a081c947 100644
--- a/packages/config/tests/load/snapshots/tests.js.md
+++ b/packages/config/tests/load/snapshots/tests.js.md
@@ -130,6 +130,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/empty/_headers",␊
@@ -258,6 +276,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "/tmp-dir/_headers",␊
@@ -394,6 +430,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/_headers",␊
@@ -530,6 +584,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/_headers",␊
@@ -674,6 +746,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/default_merge/publish/_headers",␊
@@ -815,6 +905,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/default_merge/publish/_headers",␊
@@ -952,6 +1060,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/default_priority/_headers",␊
@@ -1102,6 +1228,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/plugins_merge/_headers",␊
@@ -1244,6 +1388,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/empty/_headers",␊
@@ -1385,6 +1547,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/empty/_headers",␊
@@ -1522,6 +1702,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/default_merge/publish/_headers",␊
@@ -1663,6 +1861,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/default_merge/publish/_headers",␊
@@ -1800,6 +2016,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/default_priority/_headers",␊
@@ -1937,6 +2171,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/default_priority/_headers",␊
@@ -2073,6 +2325,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/merge_base/base/_headers",␊
@@ -2218,6 +2488,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/default_priority/_headers",␊
@@ -2355,6 +2643,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/default_priority/_headers",␊
@@ -2492,6 +2798,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/default_priority/_headers",␊
@@ -2629,6 +2953,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/default_priority/_headers",␊
@@ -2779,6 +3121,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/empty/_headers",␊
@@ -2916,6 +3276,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/cached_config/_headers",␊
@@ -3053,6 +3431,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/cached_config/_headers",␊
@@ -3190,6 +3586,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/cached_config/_headers",␊
@@ -3327,6 +3741,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "hasApi": true,␊
@@ -3472,6 +3904,18 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "test"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/cached_config/_headers",␊
@@ -3609,6 +4053,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/empty/_headers",␊
@@ -3744,6 +4206,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/empty/_headers",␊
@@ -3918,6 +4398,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/load/fixtures/empty/_headers",␊
diff --git a/packages/config/tests/load/snapshots/tests.js.snap b/packages/config/tests/load/snapshots/tests.js.snap
index 7cab4cc9dd..105d37a7c0 100644
Binary files a/packages/config/tests/load/snapshots/tests.js.snap and b/packages/config/tests/load/snapshots/tests.js.snap differ
diff --git a/packages/config/tests/log/snapshots/tests.js.md b/packages/config/tests/log/snapshots/tests.js.md
index f30481c7a6..0e794f0896 100644
--- a/packages/config/tests/log/snapshots/tests.js.md
+++ b/packages/config/tests/log/snapshots/tests.js.md
@@ -169,6 +169,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/log/fixtures/simple/_headers",␊
@@ -337,6 +355,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/log/fixtures/empty/_headers",␊
@@ -518,6 +554,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/log/fixtures/empty/_headers",␊
@@ -721,6 +775,24 @@ Generated by [AVA](https://avajs.dev).
             "configFile"␊
           ],␊
           "value": "true"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/log/fixtures/simple/_headers",␊
@@ -896,6 +968,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/log/fixtures/simple/_headers",␊
@@ -1084,6 +1174,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/log/fixtures/simple/_headers",␊
diff --git a/packages/config/tests/log/snapshots/tests.js.snap b/packages/config/tests/log/snapshots/tests.js.snap
index f058a0d9f8..c9c3a14d43 100644
Binary files a/packages/config/tests/log/snapshots/tests.js.snap and b/packages/config/tests/log/snapshots/tests.js.snap differ
diff --git a/packages/config/tests/mutate/snapshots/tests.js.md b/packages/config/tests/mutate/snapshots/tests.js.md
index 8ebb20d4fe..4c29a8861c 100644
--- a/packages/config/tests/mutate/snapshots/tests.js.md
+++ b/packages/config/tests/mutate/snapshots/tests.js.md
@@ -132,6 +132,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/mutate/fixtures/update/_headers",␊
@@ -269,6 +287,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/mutate/fixtures/context/_headers",␊
@@ -407,6 +443,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/mutate/fixtures/merge/_headers",␊
diff --git a/packages/config/tests/mutate/snapshots/tests.js.snap b/packages/config/tests/mutate/snapshots/tests.js.snap
index 334636ec3c..5e59cd6fca 100644
Binary files a/packages/config/tests/mutate/snapshots/tests.js.snap and b/packages/config/tests/mutate/snapshots/tests.js.snap differ
diff --git a/packages/config/tests/normalize/snapshots/tests.js.md b/packages/config/tests/normalize/snapshots/tests.js.md
index a87148b694..c1f677bff7 100644
--- a/packages/config/tests/normalize/snapshots/tests.js.md
+++ b/packages/config/tests/normalize/snapshots/tests.js.md
@@ -130,6 +130,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/command_empty/_headers",␊
@@ -278,11 +296,29 @@ Generated by [AVA](https://avajs.dev).
           ],␊
           "value": "false"␊
         },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
         "TEST": {␊
           "sources": [␊
             "configFile"␊
           ],␊
           "value": "test"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/props_case/base/publish/_headers",␊
@@ -430,11 +466,29 @@ Generated by [AVA](https://avajs.dev).
           ],␊
           "value": "false"␊
         },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
         "TEST": {␊
           "sources": [␊
             "configFile"␊
           ],␊
           "value": "test"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/props_case_default_config/base/publish/_headers",␊
@@ -569,6 +623,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/empty/_headers",␊
@@ -704,6 +776,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/command_empty/_headers",␊
@@ -841,6 +931,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/command_origin_config/_headers",␊
@@ -978,6 +1086,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/command_origin_context/_headers",␊
@@ -1114,6 +1240,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/empty/_headers",␊
@@ -1251,6 +1395,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/default_functions_not_defined/_headers",␊
@@ -1388,6 +1550,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/legacy_default_functions_not_defined/_headers",␊
@@ -1522,6 +1702,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/default_functions_not_defined_directory_not_found/_headers",␊
@@ -1660,6 +1858,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/default_functions_defined/_headers",␊
@@ -1798,6 +2014,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/default_functions_defined_legacy/_headers",␊
@@ -1943,6 +2177,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/default_functions_star_priority_first/_headers",␊
@@ -2088,6 +2340,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/default_functions_star_priority_last/_headers",␊
@@ -2223,6 +2493,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/default_edge_functions_not_defined/_headers",␊
@@ -2359,6 +2647,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/default_edge_functions_defined/_headers",␊
@@ -2500,6 +2806,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/function_config_top_level/_headers",␊
@@ -2655,6 +2979,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/function_config_all_levels/_headers",␊
@@ -2795,6 +3137,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/function_config_ambiguous/_headers",␊
@@ -2946,6 +3306,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/function_config_included_files/_headers",␊
@@ -3105,6 +3483,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/merge_netlify_toml_default/_headers",␊
@@ -3264,6 +3660,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/merge_netlify_toml_context/_headers",␊
@@ -3410,6 +3824,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/normalize/fixtures/merge_netlify_toml_context_last/_headers",␊
diff --git a/packages/config/tests/normalize/snapshots/tests.js.snap b/packages/config/tests/normalize/snapshots/tests.js.snap
index 2db7a214f2..9877b49d44 100644
Binary files a/packages/config/tests/normalize/snapshots/tests.js.snap and b/packages/config/tests/normalize/snapshots/tests.js.snap differ
diff --git a/packages/config/tests/parse/snapshots/tests.js.md b/packages/config/tests/parse/snapshots/tests.js.md
index c8e9a33fbf..ef37018ac9 100644
--- a/packages/config/tests/parse/snapshots/tests.js.md
+++ b/packages/config/tests/parse/snapshots/tests.js.md
@@ -132,6 +132,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/toml/_headers",␊
@@ -289,6 +307,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/parse_backslash_valid/_headers",␊
@@ -453,6 +489,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/parse_backslash_trailing_double_multiline/_headers",␊
@@ -589,6 +643,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/parse_backslash_single/_headers",␊
@@ -725,6 +797,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/parse_backslash_single_multiline/_headers",␊
@@ -861,6 +951,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/parse_backslash_equal/_headers",␊
@@ -1005,6 +1113,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/redirects_file/publish/_headers",␊
@@ -1150,6 +1276,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/redirects_field/_headers",␊
@@ -1311,6 +1455,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/redirects_both/publish/_headers",␊
@@ -1466,6 +1628,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/redirects_file_error/publish/_headers",␊
@@ -1622,6 +1802,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/redirects_field_error/_headers",␊
@@ -1765,6 +1963,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/redirects_no_publish/_headers",␊
@@ -1900,6 +2116,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/empty/_headers",␊
@@ -2070,6 +2304,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/empty/_headers",␊
@@ -2215,6 +2467,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/redirects_file/publish/_headers",␊
@@ -2357,6 +2627,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/headers_file/publish/_headers",␊
@@ -2500,6 +2788,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/headers_field/_headers",␊
@@ -2657,6 +2963,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/headers_both/publish/_headers",␊
@@ -2810,6 +3134,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/headers_file_error/publish/_headers",␊
@@ -2964,6 +3306,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/headers_field_error/_headers",␊
@@ -3105,6 +3465,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/headers_no_publish/_headers",␊
@@ -3240,6 +3618,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/empty/_headers",␊
@@ -3410,6 +3806,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/empty/_headers",␊
@@ -3553,6 +3967,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/headers_file/publish/_headers",␊
@@ -3698,6 +4130,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/headers_duplicate_case_same/_headers",␊
@@ -3848,6 +4298,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/parse/fixtures/headers_duplicate_case_different/_headers",␊
diff --git a/packages/config/tests/parse/snapshots/tests.js.snap b/packages/config/tests/parse/snapshots/tests.js.snap
index c3e4475498..c1eb433e95 100644
Binary files a/packages/config/tests/parse/snapshots/tests.js.snap and b/packages/config/tests/parse/snapshots/tests.js.snap differ
diff --git a/packages/config/tests/validate/snapshots/tests.js.md b/packages/config/tests/validate/snapshots/tests.js.md
index 3622b2c8e9..c5d059053d 100644
--- a/packages/config/tests/validate/snapshots/tests.js.md
+++ b/packages/config/tests/validate/snapshots/tests.js.md
@@ -433,6 +433,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/validate/fixtures/build_publish_parent_build/publish/_headers",␊
@@ -815,6 +833,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/validate/fixtures/build_context_plugins_warn/_headers",␊
@@ -956,6 +992,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/validate/fixtures/build_context_plugins_nowarn_global/_headers",␊
@@ -1097,6 +1151,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/validate/fixtures/build_context_plugins_nowarn_none/_headers",␊
@@ -1256,6 +1328,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/validate/fixtures/build_context_plugins_warn_inputs/_headers",␊
@@ -1802,6 +1892,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/validate/fixtures/edge_functions_mode_allowed/_headers",␊
@@ -1991,6 +2099,24 @@ Generated by [AVA](https://avajs.dev).
             "general"␊
           ],␊
           "value": "false"␊
+        },␊
+        "SITE_ID": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "HEXADECIMAL_ID"␊
+        },␊
+        "SITE_NAME": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "site-name"␊
+        },␊
+        "URL": {␊
+          "sources": [␊
+            "general"␊
+          ],␊
+          "value": "https://site-name.netlify.app"␊
         }␊
       },␊
       "headersPath": "packages/config/tests/validate/fixtures/edge_functions_header_allowed/_headers",␊
diff --git a/packages/config/tests/validate/snapshots/tests.js.snap b/packages/config/tests/validate/snapshots/tests.js.snap
index 2e1186898a..418830da6a 100644
Binary files a/packages/config/tests/validate/snapshots/tests.js.snap and b/packages/config/tests/validate/snapshots/tests.js.snap differ