ACP terminal MCP | BEFORE | 6f21b0f02a
Linux x86_64 | Node v26.12.1 | effect 4.1.3
Real CLI subprocess + real loopback HTTP/SSE peer; fresh synthetic state

CASE: server request ping before successful tool result
$ node apps/server/src/bin.ts acp-mcp-call echo '{}'
peer <- {"jsonrpc":"2.0","id":"t3-cli-0","method":"initialize","params":...}
peer <- {"jsonrpc":"2.0","method":"notifications/initialized"}
peer <- {"jsonrpc":"2.0","id":"t3-cli-1","method":"tools/call","params":...}
peer -> {"jsonrpc":"2.0","id":"server-ping","method":"ping"}
peer -> {"jsonrpc":"2.0","id":"t3-cli-1","result":{"content":[{"type":"text","text":"ok"}]}}
peer <- DELETE session
CLI stdout: {"content":[{"type":"text","text":"ok"}]}
CLI exit: 0 | handshake: OK | tool result: OK
Matching empty result: MISSING

CASE: server request unsupported/example before successful tool result
$ node apps/server/src/bin.ts acp-mcp-call echo '{}'
peer <- {"jsonrpc":"2.0","id":"t3-cli-0","method":"initialize","params":...}
peer <- {"jsonrpc":"2.0","method":"notifications/initialized"}
peer <- {"jsonrpc":"2.0","id":"t3-cli-1","method":"tools/call","params":...}
peer -> {"jsonrpc":"2.0","id":"server-unsupported","method":"unsupported/example"}
peer -> {"jsonrpc":"2.0","id":"t3-cli-1","result":{"content":[{"type":"text","text":"ok"}]}}
peer <- DELETE session
CLI stdout: {"content":[{"type":"text","text":"ok"}]}
CLI exit: 0 | handshake: OK | tool result: OK
Matching method-not-found response: MISSING

RESULT: defect reproduced; interleaved server requests dropped