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fix(acp): resolve agent mode disconnect and improve mode awareness#26332

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sripasg merged 1 commit intomainfrom
sripas_fix_1647
May 1, 2026
Merged

fix(acp): resolve agent mode disconnect and improve mode awareness#26332
sripasg merged 1 commit intomainfrom
sripas_fix_1647

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@sripasg sripasg commented May 1, 2026

Summary

Fixes the disconnect between ACP Client ( such as JetBrains/Zed ) and the agent regarding the agent mode (Plan, Default, YOLO, Auto-Edit). Addresses both the scenario where the agent ignores a mode change from the client, and the scenario where the UI is not updated after an internal mode change. Also improves prompt to make agent aware of current mode.

Details

To resolve the issue :

  • Added ApprovalModeChanged event to CoreEvent.
  • Emitted it in Config.setApprovalMode().
  • Listened to it in GeminiClient to update system instructions.
  • Listened to it in Session to send sessionUpdate() to client.
  • Included current mode in the preamble of the system prompt in snippets.ts and promptProvider.ts.
  • Updated snapshots and tests.

Related Issues

Fixes google-gemini/maintainers-gemini-cli#1647

How to Validate

image

Pre-Merge Checklist

  • [NA] Updated relevant documentation and README (if needed)
  • [✅] Added/updated tests (if needed)
  • [NA] Noted breaking changes (if any)
  • [✅] Validated on required platforms/methods:
    • [✅] MacOS
      • [✅] npm run
      • npx
      • Docker
      • Podman
      • Seatbelt
    • Windows
      • npm run
      • npx
      • Docker
    • Linux
      • npm run
      • npx
      • Docker

@sripasg sripasg requested review from a team as code owners May 1, 2026 15:55
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gemini-cli Bot commented May 1, 2026

Hi @sripasg, thank you so much for your contribution to Gemini CLI! We really appreciate the time and effort you've put into this.

We're making some updates to our contribution process to improve how we track and review changes. Please take a moment to review our recent discussion post: Improving Our Contribution Process & Introducing New Guidelines.

Key Update: Starting January 26, 2026, the Gemini CLI project will require all pull requests to be associated with an existing issue. Any pull requests not linked to an issue by that date will be automatically closed.

Thank you for your understanding and for being a part of our community!

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github-actions Bot commented May 1, 2026

Size Change: +1.9 kB (+0.01%)

Total Size: 33.9 MB

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Summary of Changes

Hello, 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 addresses synchronization issues between the ACP client and the agent regarding operational modes (Plan, Default, YOLO, Auto-Edit). By implementing a robust event-based notification system, the changes ensure that both the agent's internal state and the client's UI remain aligned. Additionally, the agent's system prompt has been enhanced to include the current mode, improving the agent's contextual awareness during task execution.

Highlights

  • Event-Driven Mode Synchronization: Introduced the ApprovalModeChanged event in CoreEvent to ensure consistent communication between the ACP client and the agent regarding mode changes.
  • System Prompt Awareness: Updated the system prompt preamble to explicitly include the current agent mode, ensuring the model is always aware of its operational context.
  • Improved UI/Client Feedback: Implemented listeners in GeminiClient and Session to trigger system instruction updates and notify the client via sessionUpdate whenever the approval mode changes.
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@gemini-cli gemini-cli Bot added the status/need-issue Pull requests that need to have an associated issue. label May 1, 2026
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Code Review

This pull request implements a mechanism to track and propagate changes to the approval mode across the application. It introduces a new ApprovalModeChanged event, updates the system prompt to reflect the current operating mode (Default, Plan, YOLO, or Auto-Edit), and ensures that both the GeminiClient and ACP sessions respond to these changes. Feedback is provided regarding a potential memory leak in acpSession.ts due to missing event listener cleanup and an optimization to prevent redundant event emissions in config.ts.

Note: Security Review is unavailable for this PR.

Comment thread packages/cli/src/acp/acpSession.ts
Comment thread packages/core/src/config/config.ts Outdated
@sripasg sripasg force-pushed the sripas_fix_1647 branch from ae1549d to debf18c Compare May 1, 2026 16:16
@sripasg sripasg requested a review from a team as a code owner May 1, 2026 16:16
@sripasg sripasg force-pushed the sripas_fix_1647 branch from c6cb606 to 45c3afc Compare May 1, 2026 17:19
@sripasg sripasg self-assigned this May 1, 2026
@sripasg sripasg added 🔒 maintainer only ⛔ Do not contribute. Internal roadmap item. ACP labels May 1, 2026
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github-actions Bot commented May 1, 2026

66 tests passed successfully on gemini-3-flash-preview.

🧠 Model Steering Guidance

This PR modifies files that affect the model's behavior (prompts, tools, or instructions).

  • ⚠️ Consider adding Evals: No behavioral evaluations (evals/*.eval.ts) were added or updated in this PR. Consider adding a test case to verify the new behavior and prevent regressions.
  • 🚀 Maintainer Reminder: Please ensure that these changes do not regress results on benchmark evals before merging.

This is an automated guidance message triggered by steering logic signatures.

Comment thread packages/cli/src/acp/acpSession.ts Outdated
Fixes the disconnect between JetBrains IDE UI and the agent regarding the agent mode (Plan, Default, YOLO, Auto-Edit). Addresses both the scenario where the agent ignores a mode change from the client, and the scenario where the UI is not updated after an internal mode change. Also improves prompt to make agent aware of current mode.

- Added ApprovalModeChanged event to CoreEvent.
- Emitted it in Config.setApprovalMode (only when mode actually changes).
- Listened to it in GeminiClient to update system instructions.
- Listened to it in Session to send sessionUpdate to client.
- Included current mode in the preamble of the system prompt in snippets.ts and promptProvider.ts.
- Updated snapshots and tests.
- Fixed test failures in config.test.ts by updating mock.
- Implemented dispose mechanism for Session to avoid memory leaks.
@sripasg sripasg force-pushed the sripas_fix_1647 branch from afc6109 to 3525570 Compare May 1, 2026 22:16
@sripasg sripasg requested a review from scidomino May 1, 2026 22:52
@sripasg sripasg added this pull request to the merge queue May 1, 2026
Merged via the queue into main with commit 4e17552 May 1, 2026
29 checks passed
@sripasg sripasg deleted the sripas_fix_1647 branch May 1, 2026 23:12
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