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fix(patch): cherry-pick 3332703 to release/v0.12.0-preview.5-pr-12317 to patch version v0.12.0-preview.5 and create version 0.12.0-preview.6#12334

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mattKorwel merged 1 commit intorelease/v0.12.0-preview.5-pr-12317from
hotfix/v0.12.0-preview.5/0.12.0-preview.6/preview/cherry-pick-3332703/pr-12317
Oct 31, 2025
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fix(patch): cherry-pick 3332703 to release/v0.12.0-preview.5-pr-12317 to patch version v0.12.0-preview.5 and create version 0.12.0-preview.6#12334
mattKorwel merged 1 commit intorelease/v0.12.0-preview.5-pr-12317from
hotfix/v0.12.0-preview.5/0.12.0-preview.6/preview/cherry-pick-3332703/pr-12317

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This PR automatically cherry-picks commit 3332703 to patch version v0.12.0-preview.5 in the preview release to create version 0.12.0-preview.6.

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Summary of Changes

Hello @gemini-cli-robot, 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 streamlines the chat history compression configuration by replacing a nested object structure with a direct numerical setting. This change simplifies how users define the compression threshold and adjusts the default value to trigger compression earlier, aiming to improve performance or context management. The update involves refactoring across documentation, CLI configuration, and core service logic to align with the new setting.

Highlights

  • Configuration Simplification: The chatCompression object, which previously contained contextPercentageThreshold, has been replaced by a single, direct compressionThreshold number property under the model settings.
  • Default Value Adjustment: The default value for the chat history compression threshold has been changed from 0.7 (70%) to 0.2 (20%), meaning compression will now trigger earlier.
  • Codebase Refactoring: All related code, including documentation, configuration loading, settings merging logic, and core service implementation, has been updated to reflect this new, simplified configuration structure.
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@mattKorwel mattKorwel enabled auto-merge (squash) October 31, 2025 01:48
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Size Change: +81 B (0%)

Total Size: 20.2 MB

ℹ️ View Unchanged
Filename Size Change
./bundle/gemini.js 20.2 MB +81 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

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Code Review

This pull request refactors the chat history compression setting, changing it from a nested object chatCompression: { contextPercentageThreshold: ... } to a simpler top-level numeric property compressionThreshold. The changes are applied consistently across documentation, configuration schemas, core logic, and tests. The default threshold for compression has also been changed from 0.7 to 0.2. My main feedback is regarding the lack of validation for the new compressionThreshold setting, which could lead to unexpected behavior if misconfigured by the user.

Comment on lines 109 to +110
const threshold =
config.getChatCompression()?.contextPercentageThreshold ??
DEFAULT_COMPRESSION_TOKEN_THRESHOLD;
config.getCompressionThreshold() ?? DEFAULT_COMPRESSION_TOKEN_THRESHOLD;
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high

The compressionThreshold is documented to be a value between 0 and 1. However, there is no validation to enforce this range. A user could provide an invalid value (e.g., > 1 or < 0) in their settings, leading to unexpected behavior without any feedback. For example, a value greater than 1 would likely prevent automatic compression from ever triggering, while a negative value could cause it to trigger on every turn.

This is a regression, as a test for warning on invalid values was removed for the old chatCompression setting but not replaced for the new compressionThreshold. It's recommended to add validation for this value. If it's outside the valid range, you could log a warning and fall back to the default value.

      let threshold =
        config.getCompressionThreshold() ?? DEFAULT_COMPRESSION_TOKEN_THRESHOLD;

      if (threshold < 0 || threshold > 1) {
        // TODO: Consider using a more formal logging mechanism if available.
        console.warn(
          `Invalid compressionThreshold value: ${threshold}. It must be between 0 and 1. Using default value ${DEFAULT_COMPRESSION_TOKEN_THRESHOLD}.`,
        );
        threshold = DEFAULT_COMPRESSION_TOKEN_THRESHOLD;
      }

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Looks good to me but @scidomino or @abhipatel12 please confirm.

@mattKorwel mattKorwel merged commit fe44afe into release/v0.12.0-preview.5-pr-12317 Oct 31, 2025
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@mattKorwel mattKorwel deleted the hotfix/v0.12.0-preview.5/0.12.0-preview.6/preview/cherry-pick-3332703/pr-12317 branch October 31, 2025 01:58
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3 participants