# R001 Code Review — Step 2: Implement the typed tool

## Verdict

**Approved.** The Step 2 implementation adds a typed `get_athlete_profile` tool, registers it through a concrete registry, uses a fakeable profile-client interface, rejects unsupported arguments at runtime, propagates the MCP request context into the intervals client call, and maps upstream failures to short public tool errors.

## Findings

No blocking findings.

## Notes

- App-level wiring to instantiate the intervals client and pass `tools.NewRegistry(...)` is still deferred, which matches the Step 2/Step 5 split in `STATUS.md`.
- Tests are still outstanding under Step 4. The important cases to cover remain registration metadata, no secret arguments, strict argument rejection (`null`, non-object JSON, unknown fields like `api_key`), success with a fake client, include-full behavior, cancellation/error mapping, normalized athlete IDs, and `_meta.server_version`.

## Checks run

- `git diff 6a79a13..HEAD --name-only`
- `git diff 6a79a13..HEAD`
- `go test ./...` — passed
- `gofmt -l internal/tools/get_athlete_profile.go internal/tools/registry.go` — no output
- `go vet ./...` — passed
