docs: clarify global policy rules application in plan mode

[jerop]

Clarify in docs/cli/plan-mode.md that policy rules without an explicit 'modes' setting apply to Plan Mode. Added a new section 'Global vs. mode-specific rules' with an example of how to exclude rules from Plan Mode by specifying other modes.

See: docs/reference/policy-engine.md#approval-modes

Closes #21709
Closes #21585

[github-actions]

Size Change: -4 B (0%)

Total Size: 26.1 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	25.7 MB	-4 B (0%)
./bundle/node_modules/@google/gemini-cli-devtools/dist/client/main.js	221 kB	0 B
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/_client-assets.js	227 kB	0 B
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/index.js	11.5 kB	0 B
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/types.js	132 B	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-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B
./bundle/sandbox-macos-strict-open.sb	4.82 kB	0 B
./bundle/sandbox-macos-strict-proxied.sb	5.02 kB	0 B

_{compressed-size-action}

[gemini-code-assist]

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 enhances the documentation for Plan Mode by clarifying how global policy rules are applied and providing an example of how to define mode-specific rules. This change helps users understand how to configure policies to behave differently in Plan Mode versus other modes.

Highlights

• Policy Rule Application: Clarifies that policy rules without an explicit 'modes' setting apply to Plan Mode.
• Mode-Specific Rules: Introduces a new section explaining how to exclude rules from Plan Mode by specifying other modes.
• Example Configuration: Provides an example of how to configure a rule to apply to 'default' and 'autoEdit' modes but not 'plan' mode.

Changelog

• docs/cli/plan-mode.md
  • Clarified the application of global policy rules in Plan Mode.
  • Added a new section explaining how to exclude rules from Plan Mode by specifying other modes.
  • Provided an example of configuring a rule to apply to specific modes.

Activity

• The pull request addresses and closes issues Gemini made changes in /plan mode. #21709 and Gemini 3.1 Pro using Shell tool to edit files while in planning mode #21585.
• The changes involve documentation updates to clarify policy rule behavior in Plan Mode.

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[gemini-code-assist]

Code Review

This pull request enhances the documentation for Plan Mode by adding a new section, 'Global vs. mode-specific rules'. This addition clarifies that policy rules lacking an explicit modes attribute are considered global and thus apply in Plan Mode. The change includes a practical example demonstrating how to configure a rule to apply to specific modes while excluding it from Plan Mode. The update is accurate and significantly improves the clarity of the policy engine's behavior for users. The changes have been reviewed and no issues were found.

_{Note: Security Review has been skipped due to the limited scope of the PR.}