feat: superposition MCP server (smithy-generated)

Cargo.toml

@@ -20,6 +20,8 @@ members = [
     "crates/superposition",
     "crates/superposition_types",
     "crates/superposition_macros",
+    "crates/superposition_mcp",
+    "crates/superposition_mcp_server",
     "crates/superposition_derives",
     "crates/superposition_core",
     "crates/superposition_provider",

crates/superposition_mcp/CHANGELOG.md

@@ -0,0 +1,5 @@
+# Changelog
+
+This file is hand-maintained alongside the otherwise auto-generated `superposition_mcp` crate.
+
+## Unreleased

crates/superposition_mcp/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "superposition_mcp"
+version.workspace = true
+edition = "2021"
+license = { workspace = true }
+homepage = { workspace = true }
+readme = "README.md"
+
+[dependencies]
+smithy-mcp-runtime = { git = "https://github.com/juspay/smithy-mcp-generator.git", rev = "6ec7445755c1410c052947f00eef1dd65011aadc", features = ["stdio", "http"] }
+superposition_sdk = { path = "../superposition_sdk" }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+async-trait = "0.1"
+tokio = { version = "1", features = ["full"] }

crates/superposition_mcp/README.md

@@ -0,0 +1,9 @@
+# superposition_mcp
+
+Generated Rust crate exposing the `io.superposition#Superposition` smithy service as an MCP (Model Context Protocol) server.
+
+**Do not edit files in this crate by hand** — they are regenerated by `make smithy-clients` from `smithy/models/*.smithy`. The exceptions are `README.md` and `CHANGELOG.md`, which are hand-preserved and restored after regeneration.
+
+The deployable binary that wraps this crate lives in `../superposition_mcp_server/`.
+
+See `docs/superpowers/specs/2026-05-11-superposition-mcp-server-design.md` for design context.

crates/superposition_mcp/src/lib.rs

@@ -0,0 +1,7 @@
+pub mod types;
+pub mod tools;
+pub mod server;
+pub mod conversions;
+
+pub use types::*;
+pub use server::McpServer;