feat: unify agent turn timeout and fix codex render boundary

[axeldelafosse]

Summary

• Unified turn timeout: Extracted a single AGENT_TURN_TIMEOUT_MS constant in constants.ts, replacing the duplicated WAIT_TIMEOUT_MS (codex) and DEFAULT_WAIT_TIMEOUT_MS (claude) definitions. Both servers now import from one source of truth.
• Increased timeout: Bumped from 10 minutes to ~11.7 hours to support long-running agent sessions without spurious timeouts.
• Codex render fix: Skip message boundary insertion when a completed event matches an item already streamed via deltas, preventing spurious line breaks mid-stream.

Test plan

• Verify long-running codex and claude turns no longer time out prematurely
• Confirm codex pretty-format output doesn't insert extra newlines between delta-streamed and completed messages
• Run bun run check — passes cleanly

[gemini-code-assist]

Summary of Changes

Hello @axeldelafosse, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors agent timeout mechanisms by consolidating disparate timeout constants into a single, shared source and substantially extending the timeout duration to accommodate prolonged agent interactions. Additionally, it addresses a rendering anomaly in the Codex agent to ensure cleaner output by preventing unnecessary message boundaries when streaming content.

Highlights

• Unified Agent Turn Timeout: A new constant, AGENT_TURN_TIMEOUT_MS, has been introduced in constants.ts to centralize the timeout definition for both Claude and Codex agents, replacing previously duplicated WAIT_TIMEOUT_MS and DEFAULT_WAIT_TIMEOUT_MS.
• Increased Timeout Duration: The agent turn timeout has been significantly increased from 10 minutes to approximately 11.7 hours (42,000,069 ms) to prevent premature timeouts during long-running agent sessions.
• Codex Render Boundary Fix: Logic was added to codex-render.ts to prevent spurious line breaks by skipping message boundary insertion when a completed event corresponds to an item already streamed via deltas.

Changelog

• src/loop/claude-sdk-server.ts
  • Replaced DEFAULT_WAIT_TIMEOUT_MS with the new AGENT_TURN_TIMEOUT_MS constant for consistency.
• src/loop/codex-app-server.ts
  • Removed the local WAIT_TIMEOUT_MS constant and adopted the unified AGENT_TURN_TIMEOUT_MS.
  • Updated timeout calls to use the new AGENT_TURN_TIMEOUT_MS constant.
• src/loop/codex-render.ts
  • Implemented conditional logic to skip message boundary insertion if a completed event matches an already delta-streamed item, preventing redundant newlines.
• src/loop/constants.ts
  • Added a new constant AGENT_TURN_TIMEOUT_MS and set its value to 42,000,069 milliseconds.

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[gemini-code-assist]

Code Review

This pull request successfully unifies the agent turn timeout into a single constant, AGENT_TURN_TIMEOUT_MS, and significantly increases its value to support long-running sessions. The change is correctly applied across both the Claude and Codex servers. Additionally, it introduces a fix in the Codex renderer to prevent extra newlines, improving output formatting. The changes are logical and well-implemented. I have one suggestion regarding the new timeout constant to improve code maintainability.