# Code Review — Step 2: Mechanical file split

Decision: **Approved**

No blocking findings.

## What I checked

- Ran the requested changed-file and full-diff commands against `2e7a84b9445c21db4bf9b7b3874290d7b7a12c71..HEAD`.
- Re-read `PROMPT.md` and `STATUS.md` for the Step 2 scope: a mechanical split only, with coach behavior still deferred to Step 3.
- Reviewed the changed `internal/mcp` files:
  - `server.go` is narrowed to the constructor/server surface.
  - `transport.go` contains the runtime/HTTP transport declarations.
  - `schema.go` contains schema mutation, validation, and SDK conversion helpers.
  - `registrar_tools.go` contains the tool registrar and existing coach-mode logic unchanged for this step.
  - `registrar_resources.go` contains the resource registrar.
  - `recover.go` contains panic recovery and SDK server construction helper.
  - `catalog_hash.go` now also hosts `(*Server).CatalogHash`.
- Verified the existing split-adjacent prompt registrar remains in `prompts.go` without introducing a duplicate registrar file.
- Checked formatting/whitespace:

```sh
gofmt -l internal/mcp/catalog_hash.go internal/mcp/recover.go internal/mcp/registrar_resources.go internal/mcp/registrar_tools.go internal/mcp/schema.go internal/mcp/server.go internal/mcp/transport.go
git diff --check 2e7a84b9445c21db4bf9b7b3874290d7b7a12c71..HEAD
```

- Ran the recorded Step 1 regression gate successfully:

```sh
go test ./internal/mcp ./internal/tools ./internal/coach ./internal/toolcatalog
```

- Also ran the broader package test suite successfully:

```sh
go test ./...
```

## Notes

- The split appears mechanical: I did not see wire-shape, error-string, ACL, catalog-hash, or transport behavior changes in the moved code.
- `CHANGELOG.md` is still not updated for TP-064; that is called out in the task documentation and should be handled before the overall task is finalized, but I do not consider it a blocker for this Step 2 mechanical split review.
