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[Server] Announce listChanged only where list changes are delivered - #593
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chr-hertel merged 2 commits intoOct 14, 2026
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🟡 Changes recommended
The key listChanged-only edge case lacks direct coverage, and the builder documentation ambiguously reverses the registry condition.
2 open findings
What changed in this PR
Corrects listChanged capability advertisement to match actual notification delivery paths.
Changes:
- Removes
listChangedfrom handshake initialization. - Limits automatic advertisement to notification buses using the built-in registry.
- Adds regression tests and changelog documentation.
| File | Description |
|---|---|
src/Schema/ServerCapabilities.php |
Adds capability transformation for handshake responses. |
src/Server/Handler/Request/InitializeHandler.php |
Strips list-change flags during initialization. |
src/Server/Builder.php |
Refines automatic capability detection. |
tests/Unit/Server/BuilderTest.php |
Tests builder detection conditions. |
tests/Unit/Server/Handler/Request/InitializeHandlerTest.php |
Tests handshake capability filtering. |
tests/Unit/Server/Stateless/StatelessProtocolTest.php |
Tests modern discovery advertisement. |
CHANGELOG.md |
Records the corrected behavior. |
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This was referenced Oct 18, 2026
valtzu
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Nov 15, 2026
…without a restart The MCP SDK removes listChanged from the answer to initialize (modelcontextprotocol/php-sdk#593), so a wrapper of the initialize handler adds it back.
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The server announced
listChangedwhenever an event dispatcher was set, but list changes only reach clients throughsubscriptions/listen. Handshake-era clients never got them, and neither did anyone without a notification bus.initializeno longer carrieslistChanged(newServerCapabilities::withoutListChanged())listChangedonly with a notification bus and the built-in registrysetCapabilities()still keep it onserver/discoverFixes chr-hertel#76
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