# Code Review — Step 3: Collapse `schemaCatalogClient`

**Verdict: approve.**

The Step 3 change removes the now-dead `schemaCatalogClient` type, compile-time interface assertions, and per-interface stub methods from `internal/toolchecks/schema_stability.go`. The existing no-network real `*intervals.Client` path and schema-catalog allow-list remain in place, so the 30-tool schema/catalog surface is preserved while eliminating the hand-maintained fake fan-out targeted by this task.

No blocking findings.

## Notes

- `GenerateSchemaSnapshots()` and `GenerateToolCatalog()` still share `generateSchemaCatalogTools()`, keeping schema stability and confusable-name checks on the same filtered catalog.
- The no-network guard remains via `schemaCatalogRoundTripper`, so schema/catalog generation will fail if registration attempts HTTP.
- `grep -R "schemaCatalogClient" internal/toolchecks` now returns no matches.

## Verification

Commands run:

- `git diff 1c5fafffb0697e858618154edaaa7e17863e9584..HEAD --name-only`
- `git diff 1c5fafffb0697e858618154edaaa7e17863e9584..HEAD`
- `grep -R "schemaCatalogClient" internal/toolchecks || true` — no matches
- `go test ./internal/toolchecks` — passes
- `go run ./scripts/check_schema_stability.go` — passes
- `go run ./scripts/check_confusable_names.go` — passes
- `go test ./...` — passes
- `make lint` — passes
