perf(cli): truncate large debug logs and limit message history

[mattKorwel]

Summary

This PR fixes memory bloat and potential OOM crashes when running the Gemini CLI with the --debug flag enabled. It introduces truncation for large console logs and output chunks, and limits the total number of debug messages stored in the UI.

Details

• Implemented log truncation in ConsolePatcher (capped at 10,000 characters).
• Implemented output chunk truncation in useConsoleMessages hook (capped at 10,000 characters).
• Added a limit of 1,000 messages for the debug console history in useConsoleMessages reducer.

Related Issues

Related to the out-of-memory error crashes reported during session.

How to Validate

1. Run the CLI with the --debug flag.
2. Trigger large outputs (e.g., npm run test or reading large files).
3. Open the debug drawer and verify that large messages are truncated and indicated with "... [Truncated X characters]".
4. Verify that the UI remains responsive and memory usage stays stable even after many messages are logged.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run

[gemini-code-assist]

Summary of Changes

Hello @mattKorwel, 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 significantly enhances the stability and performance of the Gemini CLI, particularly when operating in debug mode. By introducing intelligent truncation mechanisms for excessively large log messages and output data, and by capping the historical record of debug messages, the changes effectively mitigate memory consumption issues. This ensures a more robust and responsive user interface, preventing crashes that could arise from overwhelming the system with verbose debug information.

Highlights

• Memory Optimization: Implemented truncation for large console logs and output chunks to prevent memory bloat and potential Out-Of-Memory (OOM) crashes when running the CLI with the --debug flag.
• Debug Message History Limit: Limited the total number of debug messages stored in the UI to 1,000 to maintain responsiveness and stable memory usage.
• User Feedback for Truncation: Truncated messages and output chunks now include an indicator '... [Truncated X characters]' to inform the user about the truncation.

Changelog

• packages/cli/src/ui/hooks/useConsoleMessages.ts
  • Introduced MAX_CONSOLE_MESSAGES constant set to 1000 to limit the number of stored console messages.
  • Added logic within the ADD_MESSAGES case to slice the newMessages array, ensuring the message history does not exceed MAX_CONSOLE_MESSAGES.
  • Defined MAX_OUTPUT_CHUNK_LENGTH constant as 10000 for truncating large output chunks.
  • Implemented truncation for payload.chunk content if its length exceeds MAX_OUTPUT_CHUNK_LENGTH, appending a truncation message.
• packages/cli/src/ui/utils/ConsolePatcher.ts
  • Modified the formatArgs private method to include truncation logic for formatted console messages.
  • Messages exceeding MAX_CONSOLE_MSG_LENGTH (10000 characters) are now truncated, with a '... [Truncated X characters]' suffix added.

Activity

• The pull request was opened by mattKorwel to address memory bloat and OOM crashes.
• No further review comments or activity have been recorded since the initial commit.

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[github-actions]

Size Change: +670 B (0%)

Total Size: 23.9 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	23.9 MB	+670 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

_{compressed-size-action}

[jacob314]

nit: add a helper for this string truncation logic

[jacob314]

nit: move const to the top level.

[jacob314]