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Add per-request timeout configuration support#38

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jancurn merged 7 commits intomainfrom
claude/fix-mcpc-timeout-YImuH
Mar 7, 2026
Merged

Add per-request timeout configuration support#38
jancurn merged 7 commits intomainfrom
claude/fix-mcpc-timeout-YImuH

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@jancurn jancurn commented Mar 7, 2026

Summary

This PR adds support for configurable per-request timeouts throughout the MCP client stack, allowing users to override the default 3-minute timeout on a per-request basis via a CLI --timeout flag.

Key Changes

  • SessionClient: Added setRequestTimeout() method and requestTimeout property to store per-request timeout values. Updated all MCP operation methods to pass the timeout to bridge client requests.

  • BridgeClient: Modified request() method to accept an optional timeout parameter (in seconds), convert it to milliseconds, and use it instead of the default REQUEST_TIMEOUT constant. The timeout is also included in the IPC message payload.

  • McpClient: Added setRequestTimeout() method to allow setting timeout values (in milliseconds) for subsequent requests.

  • BridgeProcess: Added logic to extract per-request timeout from IPC messages and apply it to the client before executing requests.

  • CLI helpers: Updated withMcpClient() to accept a timeout option and pass it through to withSessionClient().

  • Type definitions: Extended IpcMessage interface to include optional timeout field for per-request timeout specification.

Implementation Details

  • Timeout values flow through the stack as seconds (CLI → SessionClient → BridgeClient → IPC message) and are converted to milliseconds at the point of use
  • The per-request timeout overrides the default 3-minute timeout when specified
  • All existing MCP operation methods (listTools, callTool, listResources, readResource, listPrompts, getPrompt, etc.) have been updated to pass the timeout parameter
  • The implementation maintains backward compatibility - when no timeout is specified, the default behavior is preserved

https://claude.ai/code/session_01HmGaGAavxHEZcSRfNguGeo

claude and others added 7 commits March 7, 2026 09:25
… client

The --timeout flag was parsed from CLI options but never propagated to
the actual request. The timeout now flows through the full chain:
CLI → withMcpClient → withSessionClient → SessionClient → BridgeClient → Bridge → McpClient.

- BridgeClient.request() accepts optional timeout parameter (seconds)
- IpcMessage includes timeout field forwarded to bridge process
- Bridge applies per-request timeout override on McpClient before each call
- SessionClient stores and passes timeout to all BridgeClient requests
- withSessionClient/withMcpClient thread timeout from CLI options

https://claude.ai/code/session_01HmGaGAavxHEZcSRfNguGeo
Tests that --timeout causes tool calls to fail when the server is slower
than the timeout, succeeds when generous enough, and produces valid JSON
errors in --json mode.

https://claude.ai/code/session_01HmGaGAavxHEZcSRfNguGeo
The MCP SDK may produce different error messages on timeout depending on
timing (timeout, abort, or session-not-found). Relax assertion to check
for failure and non-empty stderr rather than specific "timeout" text.
Also increase delays for CI reliability.

https://claude.ai/code/session_01HmGaGAavxHEZcSRfNguGeo
@jancurn jancurn merged commit ecb279b into main Mar 7, 2026
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jancurn added a commit that referenced this pull request Mar 7, 2026
* fix: thread --timeout flag through session commands to bridge and MCP client

The --timeout flag was parsed from CLI options but never propagated to
the actual request. The timeout now flows through the full chain:
CLI → withMcpClient → withSessionClient → SessionClient → BridgeClient → Bridge → McpClient.

- BridgeClient.request() accepts optional timeout parameter (seconds)
- IpcMessage includes timeout field forwarded to bridge process
- Bridge applies per-request timeout override on McpClient before each call
- SessionClient stores and passes timeout to all BridgeClient requests
- withSessionClient/withMcpClient thread timeout from CLI options

https://claude.ai/code/session_01HmGaGAavxHEZcSRfNguGeo

* test: add E2E integration tests for --timeout flag

Tests that --timeout causes tool calls to fail when the server is slower
than the timeout, succeeds when generous enough, and produces valid JSON
errors in --json mode.

https://claude.ai/code/session_01HmGaGAavxHEZcSRfNguGeo

* fix: make timeout E2E test resilient to varying error messages

The MCP SDK may produce different error messages on timeout depending on
timing (timeout, abort, or session-not-found). Relax assertion to check
for failure and non-empty stderr rather than specific "timeout" text.
Also increase delays for CI reliability.

https://claude.ai/code/session_01HmGaGAavxHEZcSRfNguGeo

* docs: add --timeout fix to changelog

https://claude.ai/code/session_01HmGaGAavxHEZcSRfNguGeo

---------

Co-authored-by: Claude <noreply@anthropic.com>
jancurn pushed a commit that referenced this pull request Mar 7, 2026
…ommands

- Add RequestOptionsOverride type and 'set-request-options' IPC message
- CLI sends --header flags to bridge via IPC before each command
- Bridge applies headers to MCP client transport in-memory (no persistence)
- McpClient gains updateTransportHeaders() for runtime header updates
- BridgeClient gains sendRequestOptions() for one-way IPC messages
- Add debug logging to existing setRequestTimeout() (from PR #38)
- Remove --profile option from session commands (use connect --profile)
- Timeout handled by PR #38's per-request IPC path (no duplication)
@jancurn jancurn deleted the claude/fix-mcpc-timeout-YImuH branch March 12, 2026 14:17
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3 participants