PolicyEngine · anth-volk · May 29, 2026 · Jun 1, 2026 · Jun 1, 2026
diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
@@ -0,0 +1,15 @@
+# Copilot Instructions
+
+Follow the repository's canonical engineering skills under
+`docs/engineering/skills/`.
+
+For API v2 migration contract, route-group metadata, generated migration docs,
+or migration guard changes, read
+`docs/engineering/skills/migration_contracts.md`.
+
+For tests, read `docs/engineering/skills/testing.md` before adding, moving, or
+reviewing test files.
+
+For pull requests, read `docs/engineering/skills/github-prs.md` before opening,
+replacing, or sharing a PR.
+
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
@@ -18,6 +18,18 @@ jobs:
         run: pip install ruff>=0.9.0
       - name: Format check with ruff
         run: ruff format --check .
+  quality-guards:
+    name: Quality guards
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - name: Run quality guards
+        run: python scripts/run_quality_guards.py
   check-changelog:
     name: Check changelog fragment
     runs-on: ubuntu-latest

diff --git a/AGENTS.md b/AGENTS.md
@@ -0,0 +1,29 @@
+# Agent Instructions
+
+These instructions apply repository-wide.
+
+## Skills System
+
+Canonical AI-facing engineering skills live under `docs/engineering/skills/`.
+Use those files as the source of truth across Codex, Claude, Copilot, and other
+AI tools.
+
+When changing API v2 migration contracts, route-group migration metadata, PR
+cutover plans, generated migration docs, or migration guard scripts, read
+`docs/engineering/skills/migration_contracts.md`.
+
+When adding, moving, or reviewing tests, read
+`docs/engineering/skills/testing.md`.
+
+## GitHub PRs
+
+Read `docs/engineering/skills/github-prs.md` before opening, replacing, or
+sharing any pull request.
+
+Before creating or sharing a migration PR, run the focused migration guards:
+
+```bash
+python scripts/run_quality_guards.py
+python scripts/export_migration_contracts.py
+```
+
diff --git a/CLAUDE.md b/CLAUDE.md
@@ -0,0 +1,31 @@
+# Claude Instructions
+
+These instructions apply repository-wide.
+
+## Canonical Guidance
+
+Repository-wide AI-facing engineering guidance lives in `AGENTS.md`.
+Canonical skills live under `docs/engineering/skills/`.
+
+Use those files as the source of truth. This file is a Claude adapter and should
+stay thin; do not duplicate detailed testing, CI, formatting, or architecture
+rules here.
+
+## Required Skill Lookup
+
+Before opening, replacing, or sharing a PR, read
+`docs/engineering/skills/github-prs.md`.
+
+When changing API v2 migration contracts, route-group migration metadata,
+generated migration docs, or migration guard scripts, read
+`docs/engineering/skills/migration_contracts.md`.
+
+When adding, moving, or reviewing tests, read
+`docs/engineering/skills/testing.md`.
+
+## Safety Boundaries
+
+Do not claim a route, database table, compute path, or deployment surface has
+migrated unless the relevant contract tests, migration flags, and generated
+migration docs identify that state.
+
diff --git a/Makefile b/Makefile
@@ -11,8 +11,11 @@ test-env-vars:
 	pytest tests/env_variables
 
 test:
-	MAX_HOUSEHOLDS=1000 coverage run -a --branch -m pytest tests/to_refactor tests/unit tests/integration/test_budget_window_in_flight_dedupe.py --disable-pytest-warnings
-	coverage xml -i
+	MAX_HOUSEHOLDS=1000 python -m coverage run -a --branch -m pytest tests/to_refactor tests/unit tests/contract tests/integration/test_budget_window_in_flight_dedupe.py --disable-pytest-warnings
+	python -m coverage xml -i
+
+quality-guards:
+	python scripts/run_quality_guards.py
 
 debug-test:
 	MAX_HOUSEHOLDS=1000 FLASK_DEBUG=1 pytest -vv --durations=0 tests

diff --git a/changelog.d/migration-pr1-contract-harness.added.md b/changelog.d/migration-pr1-contract-harness.added.md
@@ -0,0 +1 @@
+Added migration contract tests, typed migration registries, no-op source flags, migration-context logging, baseline capture tooling, and model-agnostic AI harness docs for the API v2 migration.
diff --git a/docs/engineering/migration-contracts.md b/docs/engineering/migration-contracts.md
@@ -0,0 +1,100 @@
+# Migration Contracts
+
+Generated from `policyengine_api/migration_registry.py` and `tests/contract/registry.py`.
+
+## Summary
+
+| Metric | Count |
+| --- | ---: |
+| route group count | 10 |
+| workflow count | 7 |
+| request count | 14 |
+| db entity count | 6 |
+| sim flow count | 3 |
+
+## Route Groups
+
+| Route group | Path segments | DB entity | Simulation flow |
+| --- | --- | --- | --- |
+| `metadata` | `metadata` | `metadata` | `none` |
+| `policy` | `policy`, `policies`, `user-policy` | `policy` | `none` |
+| `household` | `household`, `calculate`, `calculate-full` | `household` | `household` |
+| `economy` | `economy` | `simulation` | `economy` |
+| `simulation` | `simulation`, `simulations` | `simulation` | `economy` |
+| `report` | `report` | `report` | `report` |
+| `user_profile` | `user-profile` | `user` | `none` |
+| `simulation_analysis` | `simulation-analysis` | `none` | `none` |
+| `tracer_analysis` | `tracer-analysis` | `none` | `none` |
+| `ai` | `ai-prompts` | `none` | `none` |
+
+## App V2 Workflow Contracts
+
+### `policy_save_search`
+
+- Current contract: `api_v1_compatible`
+- Future owner: PR 10: Policy Migration
+
+| Method | Path | Status | Route group | Stable response fields |
+| --- | --- | ---: | --- | --- |
+| `POST` | `/us/policy` | 201 | `policy` | `status`, `message`, `result.policy_id` |
+| `GET` | `/us/policy/{policy_id}` | 200 | `policy` | `status`, `message`, `result` |
+| `GET` | `/us/policies` | 200 | `policy` | `result` |
+
+### `household_save_edit_read`
+
+- Current contract: `api_v1_compatible`
+- Future owner: PR 11: Household Migration
+
+| Method | Path | Status | Route group | Stable response fields |
+| --- | --- | ---: | --- | --- |
+| `POST` | `/us/household` | 201 | `household` | `status`, `message`, `result.household_id` |
+| `PUT` | `/us/household/{household_id}` | 200 | `household` | `status`, `message`, `result.household_id` |
+| `GET` | `/us/household/{household_id}` | 200 | `household` | `status`, `message`, `result` |
+
+### `household_calculate`
+
+- Current contract: `api_v1_compatible`
+- Future owner: PR 13: Household Calculation Compute Cutover
+
+| Method | Path | Status | Route group | Stable response fields |
+| --- | --- | ---: | --- | --- |
+| `POST` | `/us/calculate` | 200 | `household` | `status`, `message`, `result` |
+
+### `region_selection`
+
+- Current contract: `api_v1_compatible`
+- Future owner: PR 9: v2 Metadata, Regions, Datasets, Parameters, and Variables
+
+| Method | Path | Status | Route group | Stable response fields |
+| --- | --- | ---: | --- | --- |
+| `GET` | `/us/metadata` | 200 | `metadata` | `status`, `result.current_law_id`, `result.economy_options.region`, `result.economy_options.time_period` |
+| `GET` | `/uk/metadata` | 200 | `metadata` | `status`, `result.current_law_id`, `result.economy_options.region`, `result.economy_options.time_period` |
+
+### `simulation_submit_poll`
+
+- Current contract: `api_v1_compatible`
+- Future owner: PR 13: Household Calculation Compute Cutover
+
+| Method | Path | Status | Route group | Stable response fields |
+| --- | --- | ---: | --- | --- |
+| `POST` | `/us/simulation` | 201 | `simulation` | `status`, `message`, `result.id`, `result.status` |
+| `GET` | `/us/simulation/{simulation_id}` | 200 | `simulation` | `status`, `message`, `result` |
+
+### `report_create_poll`
+
+- Current contract: `api_v1_compatible`
+- Future owner: PR 14: Economy Simulation and Economic Impact Compute Cutover
+
+| Method | Path | Status | Route group | Stable response fields |
+| --- | --- | ---: | --- | --- |
+| `POST` | `/us/report` | 201 | `report` | `status`, `message`, `result.id`, `result.status` |
+| `GET` | `/us/report/{report_id}` | 200 | `report` | `status`, `message`, `result` |
+
+### `budget_window_submit_poll`
+
+- Current contract: `api_v1_compatible`
+- Future owner: PR 15: Budget-Window and Remaining Simulation API Migration
+
+| Method | Path | Status | Route group | Stable response fields |
+| --- | --- | ---: | --- | --- |
+| `GET` | `/us/economy/{policy_id}/over/{baseline_policy_id}/budget-window?region=us&start_year=2026&window_size=1` | 200 | `economy` | `status`, `result.kind`, `progress`, `completed_years`, `computing_years`, `queued_years`, `error` |
diff --git a/docs/engineering/skills/README.md b/docs/engineering/skills/README.md
@@ -0,0 +1,17 @@
+# Engineering Skills
+
+This directory is the canonical source for AI-facing engineering rules.
+
+Tool-specific instruction files such as `AGENTS.md`, `CLAUDE.md`, and
+`.github/copilot-instructions.md` should point here instead of duplicating
+implementation-specific guidance. When a rule changes, update the skill here
+first, then keep adapters thin.
+
+Current skills:
+
+- `github-prs.md`: PR workflow and migration PR handoff expectations.
+- `migration_contracts.md`: API v2 migration route contracts, route-group
+  metadata, generated migration artifacts, and quality guards.
+- `testing.md`: focused test commands and dependency boundaries for migration
+  work.
+
diff --git a/docs/engineering/skills/github-prs.md b/docs/engineering/skills/github-prs.md
@@ -0,0 +1,27 @@
+# GitHub PRs
+
+Use this skill before opening, replacing, or sharing a pull request.
+
+## Migration PRs
+
+Migration PRs should keep the user experience stable unless the PR explicitly
+declares an API contract change. If a PR changes migration route contracts,
+route-group metadata, generated migration artifacts, or the cutover guardrails,
+it should:
+
+1. Include a changelog fragment.
+2. Refresh generated migration artifacts with
+   `python scripts/export_migration_contracts.py`.
+3. Run `python scripts/run_quality_guards.py`.
+4. Run the focused contract or unit tests that cover the changed surface.
+
+## PR Descriptions
+
+For migration work, identify:
+
+- which route groups or workflows are covered;
+- what remains on the Flask/API v1 path;
+- what is newly prepared for FastAPI, SQLAlchemy/Alembic, Supabase, Cloud Run,
+  or Modal migration;
+- which user-visible API contract changes are intentionally introduced.
+
diff --git a/docs/engineering/skills/migration_contracts.md b/docs/engineering/skills/migration_contracts.md
@@ -0,0 +1,47 @@
+# Migration Contracts
+
+Use this skill when changing API v2 migration contracts, route-group migration
+metadata, generated migration docs, or guard scripts.
+
+## Sources Of Truth
+
+- `policyengine_api/migration_registry.py` defines route groups, path segments,
+  database entities, and simulation flows used by migration flags and request
+  logging.
+- `tests/contract/registry.py` defines app-v2 user workflows and stable route
+  response fields that must be preserved while the migration is staged.
+- `scripts/export_migration_contracts.py` merges those sources into:
+  - `docs/generated/migration_contracts.json`
+  - `docs/engineering/migration-contracts.md`
+
+Generated migration artifacts are checked-in review material. If a PR changes a
+route group, workflow contract, stable response field, or future owner PR, run
+the exporter and commit the regenerated files in the same PR.
+
+## Update Workflow
+
+```bash
+python scripts/export_migration_contracts.py
+python scripts/run_quality_guards.py
+python -m pytest tests/contract tests/unit/test_migration_contract_artifacts.py -q
+```
+
+The migration-contracts guard checks that workflow names and route requests are
+unique, every contract route group is declared in the migration registry, stable
+response fields are present, and generated artifacts match the current
+registry.
+
+## Annotation Rules
+
+Keep contract metadata explicit and durable:
+
+- Use stable route-group names that match the migration flag environment
+  surface.
+- Record the current user-facing contract, not an aspirational target.
+- Keep `future_owner_pr` at the granularity of the migration plan so reviewers
+  can tell which later PR owns each workflow.
+- Add only response fields that are meaningful user-facing compatibility
+  anchors.
+- If a route intentionally changes its API contract, update the generated docs
+  and call that out in the PR description.
+
diff --git a/docs/engineering/skills/testing.md b/docs/engineering/skills/testing.md
@@ -0,0 +1,27 @@
+# Testing Skill
+
+Use this skill whenever adding, moving, or reviewing tests.
+
+## Migration Test Layout
+
+- Put API migration compatibility tests under `tests/contract/`.
+- Put focused unit tests for migration flags, generated artifacts, guard
+  scripts, or baseline tools under `tests/unit/`.
+- Keep contract tests isolated from live Cloud SQL, Modal, external AI APIs, and
+  network credentials unless the test is explicitly marked as a live integration
+  probe.
+
+## Focused Commands
+
+For PR 1 migration harness changes, prefer these focused checks before running
+the full suite:
+
+```bash
+python scripts/run_quality_guards.py
+python scripts/export_migration_contracts.py
+python -m pytest tests/contract tests/unit/test_migration_flags.py tests/unit/test_migration_contract_artifacts.py tests/unit/test_capture_migration_baseline.py tests/unit/routes/test_migration_context_logging.py -q
+```
+
+Run `ruff format --check` and `ruff check` on changed Python files before
+handoff.
+
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Added migration contract tests, typed migration registries, no-op source flags, migration-context logging, baseline capture tooling, and model-agnostic AI harness docs for the API v2 migration.