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[Schema][Client] Bump default spec version - #550
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🟡 Changes recommended
Transport error handling and stream scheduling contain unresolved correctness issues.
4 open findings
What changed in this PR
Defaults the PHP MCP client to 2026-07-28, with handshake fallback for older servers, and adds dual-era stdio support.
Changes:
- Adds protocol probing, configurable fallback, and modern client behavior.
- Updates stdio routing, streaming, and transport failure handling.
- Expands compatibility tests, documentation, and examples.
| File | Description |
|---|---|
| tests/Unit/Server/Transport/StdioDualEraTest.php | Tests dual-era routing and streaming. |
| tests/Unit/Server/Stateless/StatelessProtocolTest.php | Tests inline requests and refusals. |
| tests/Unit/Server/ProtocolTest.php | Checks refusal response IDs. |
| tests/Unit/ClientTest.php | Tests logging connection requirements. |
| tests/Unit/Client/Transport/StdioTransportTest.php | Tests process exit and notification ordering. |
| tests/Unit/Client/Transport/HttpTransportTest.php | Tests refusals, fallback, and ordering. |
| tests/Unit/Client/ProtocolTest.php | Expands negotiation coverage. |
| tests/Unit/Client/ConfigurationTest.php | Tests defaults and fallback validation. |
| tests/Integration/SamplingToolsTest.php | Pins sampling to handshake protocol. |
| tests/Integration/SamplingTest.php | Tests sampling across protocol eras. |
| tests/Integration/RootsTest.php | Pins roots to handshake protocol. |
| tests/Integration/NotificationTest.php | Tests notifications across both eras. |
| tests/Integration/IntegrationTestCase.php | Adds shared protocol-era provider. |
| tests/Integration/HttpNegotiationTest.php | Tests HTTP protocol compatibility. |
| tests/Integration/HandshakeTest.php | Expands stdio negotiation tests. |
| tests/Integration/Fixture/http.php | Adds configurable HTTP server fixture. |
| tests/Integration/Fixture/handshake.php | Adds handshake-only fixture mode. |
| tests/Integration/ElicitationTest.php | Tests era-specific elicitation failures. |
| src/Server/Transport/StdioTransport.php | Adds dual-era routing and streams. |
| src/Server/Stateless/StatelessProtocol.php | Supports headerless dispatch and pacing. |
| src/Server/Protocol.php | Preserves request IDs in refusals. |
| src/Schema/Result/InitializeResult.php | Keeps initialization defaults handshake-compatible. |
| src/Schema/JsonRpc/MessageInterface.php | Bumps default protocol version. |
| src/Client/Transport/StdioTransport.php | Handles process failures and progress ordering. |
| src/Client/Transport/HttpTransport.php | Handles HTTP refusals and progress ordering. |
| src/Client/Stateless/RequestEnvelope.php | Adds per-request logging level. |
| src/Client/Protocol.php | Implements probing and handshake fallback. |
| src/Client/Configuration.php | Updates defaults and validates fallback. |
| src/Client/Builder.php | Exposes fallback configuration. |
| src/Client.php | Adapts calls to negotiated protocol. |
| examples/server/bootstrap.php | Updates transport documentation comments only. |
| examples/client/stdio_client_communication.php | Explicitly enables server logging. |
| examples/client/http_client_communication.php | Explicitly enables server logging. |
| docs/run/protocol-eras.md | Documents dual-era stdio behavior. |
| docs/protocol-versions.md | Explains negotiation and modern behavior. |
| docs/client/connecting.md | Documents defaults and fallback configuration. |
| CHANGELOG.md | Records compatibility and transport changes. |
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🟢 Approval recommended
The defaults match existing negotiation support, and targeted inspection found no blocking regression in the examples’ input-request handling.
1 open finding
3 resolved since last review
🧠 Review effort: Balanced
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Replaces #537