fix: WorkerTransport doesn't persist clientCapabilities, breaking elicitation in serverless #27667
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Update documentation to reflect changes from cloudflare/agents PR #783: - Add initializeParams field to TransportState interface - Document automatic persistence and restoration of client capabilities - Explain behavior in serverless environments (Durable Objects/Agents) - Note backward compatibility with older stored state Related to: cloudflare/agents#783
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This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:
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Update MCP handler API documentation to reflect that WorkerTransport now persists and restores client capabilities across serverless restarts. Changes: - Document that client capabilities (elicitation, sampling) are persisted - Update TransportState interface to show initializeParams field - Add explanation of capability restoration mechanism - Include backward compatibility note - Add links to elicitation and sampling specifications Related to cloudflare/agents#783 Co-Authored-By: Claude Sonnet 4.5 <[email protected]>
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Preview URL: https://7704885a.preview.developers.cloudflare.com Files with changes (up to 15) |
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Summary
Document the new client capabilities persistence feature in
WorkerTransportfrom cloudflare/agents PR #783.Changes
Updated
/agents/model-context-protocol/mcp-handler-api/documentation to reflect:initializeParamsfield inTransportStateinterface that stores client capabilities, clientInfo, and protocolVersioninitializeParamsfieldContext
The original PR (cloudflare/agents#783) fixed a critical bug where client capabilities were not persisted in serverless environments. This caused features like elicitation to fail after Durable Object/Agent hibernation.
The fix ensures that when using
WorkerTransportwith persistent storage, client capabilities are:This documentation update makes developers aware of this behavior and the new fields in
TransportState.Related PR