# Plan Review: Step 4 — Parity tests

## Verdict

APPROVE

## Findings

No blocking findings.

## Notes

- The plan is appropriately scoped to the Step 4 acceptance criteria: run the shared protocol scenarios against both the existing in-memory/stdio-equivalent SDK path and Streamable HTTP, then compare stable handler outputs where practical.
- The listed coverage matches the prompt checklist: initialize, `tools/list`, successful and missing tool calls, sanitized tool errors, resources list/read/not-found/sanitized errors, prompts list/get, and malformed HTTP requests.
- Keep the parity assertion focused on stable SDK result payloads serialized to canonical JSON. Avoid comparing transport-specific envelopes, session IDs, timing fields, or headers.
- If any existing protocol coverage remains outside `TestProtocolSharedTransportSuite`, either move it into the shared suite or explicitly justify why it is not transport-relevant.
- Be precise in the status/code review wording: these tests compare handler behavior across the existing SDK in-memory/stdio-equivalent path and Streamable HTTP, not raw stdio process I/O unless a real stdio harness is added.
