[chilung-cgu]

Summary

Vertex AI and direct Gemini requests previously forwarded only thinkingLevel inside generationConfig.thinkingConfig, ignoring provider.showThinkingSummary. Without includeThoughts: true, Google withholds thought: true chunks for the entire internal reasoning phase—leaving long Vertex gemini-4-argon turns completely silent on the SSE stream until reasoning finishes and tripping the 200 s routed-model response-byte inactivity guard during web-search turns.

This extends the existing provider.showThinkingSummary opt-in (already supported on Cloud Code Assist) to thinking-eligible Vertex and direct Gemini requests:

• When thinkingEligible && provider.showThinkingSummary === true && parsed.options.hideThinkingSummary !== true && /^gemini-/.test(routedModelId), include includeThoughts: true in generationConfig.thinkingConfig alongside thinkingLevel (or on its own when no explicit effort was mapped).
• Set returnsThoughtSummaries under the same thinkingEligible && provider.showThinkingSummary === true guard so returned thought: true parts classify as thinking_delta summaries rather than raw reasoning.
• Default behavior is unchanged: google-vertex and google presets still leave showThinkingSummary unset (false), explicit client reasoning.summary: "none" (hideThinkingSummary: true) suppresses includeThoughts, and unladdered Vertex models or image-capable models are excluded.

Verification

• bun test tests/adapters/google/google-adapter.test.ts: 58 pass, 0 fail (5 new test cases including stream=false/true parity and reused-adapter provenance reset across eligible, unladdered, and image-capable models, covering Vertex and direct Gemini includeThoughts opt-in, omission when unset/false/client-suppressed, exclusion of unladdered Vertex and image models, and thinking_delta vs reasoning_raw_delta provenance).
• OCX_TEST_NO_QUEUE=1 bun test tests/adapters/google/google-adapter.test.ts tests/adapters/google/google-hardening.test.ts tests/adapters/google/google-wire-compiler.test.ts tests/responses/responses-show-thinking-summary.test.ts tests/responses/protocol-argon-thought-boundary.test.ts tests/ci-workflows/file-size-ratchet.test.ts tests/ci-workflows/structure-ssot.test.ts: 289 pass, 0 fail.
• OCX_TEST_NO_QUEUE=1 bun test tests/providers/opencode-go-gemini-wire.test.ts tests/providers/opencode-zen-gemini-wire.test.ts: 68 pass, 0 fail.
• bun x tsc --noEmit, bun run structure:check, bun run privacy:scan, bun run skill:surface:check: exit 0.
• Live against Vertex gemini-4-argon with showThinkingSummary: true: first response.reasoning_summary_text.delta SSE chunk arrives in ~2.8–3.8 s and streams every 4–6 s throughout reasoning; with reasoning: { summary: "none" }, no summary deltas are emitted.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

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Summary by CodeRabbit

• New Features
  • Eligible direct Gemini, Vertex, and Cloud Code Assist Gemini requests can include thought summaries when display is enabled and summaries aren’t suppressed.
  • Thought summaries remain unavailable for image-capable models, unladdered Vertex models, and models excluded from reasoning; existing exclusions for Claude and gpt-oss are unchanged.
  • Thought text from opted-in eligible Gemini requests, including Cloud Code Assist Gemini, is now recognized as a thinking update.
• Documentation
  • Updated the configuration reference to describe when thought summaries are included.

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• tests/adapters/google/google-adapter.test.ts

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📝 Walkthrough

Eligible CCA, Vertex, and direct Gemini requests can opt into thought summaries. The Google adapter classifies marked thought parts as thinking_delta for supported requests. Documentation and tests cover opt-in conditions, exclusions, and response classification.

Changes: Google thought summaries

Layer / File(s)	Summary
Enable thought summaries for eligible requests src/adapters/google.ts, structure/providers/google.md, docs-site/src/content/docs/reference/configuration/providers.md, tests/adapters/google/google-adapter.test.ts	Eligible requests can include thinkingConfig.includeThoughts: true when provider opt-in and per-request display conditions allow it. The request configuration is emitted when a thinking level or thought summaries are requested. Tests cover enabled and excluded cases, including unladdered Vertex and image-capable models.
Classify returned thought text structure/providers/google.md, tests/adapters/google/google-adapter.test.ts	The classifier includes built CCA Gemini requests when it classifies marked thought parts as thinking_delta. Tests verify reasoning_raw_delta for requests without opt-in and unladdered Vertex models. They also cover successive requests on a reused adapter.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 28560

Eligible Gemini requests can opt into thought summaries, while configured exclusions and hidden-summary settings remain respected. No actionable merge-blocking risk was identified.

Pre-merge checks: 5

Check name	Status	Explanation
Docstring Coverage		Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 2 files.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the primary change: applying showThinkingSummary to Vertex and direct Gemini requests. It matches the documented implementation and test scope.

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✅ READY

• all PR quality gates passed; the review readiness checklist is complete.

Review readiness checklist

• ✅ Required local validation passed; commands, results, and any full-suite exception are documented.
• ✅ I pushed my PR to a recent dev commit (at most 10 behind; a maintainer may still ask for the exact tip before merge).
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Maintainers: @lidge-jun @Ingwannu

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/adapters/google.ts:
- Line 1031: Update the thinking-eligibility condition in the Google adapter
around configuredReasoningEfforts so an empty reasoning ladder is not eligible;
retain the direct-Gemini fallback only when the model is not excluded by
noReasoningModels.

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• src/adapters/google.ts
• structure/providers/google.md
• tests/adapters/google/google-adapter.test.ts

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[Ingwannu]

Code/test review at 4fd43d5035: the opt-in is confined to thinking-eligible Gemini, the empty ladder/noReasoningModels exclusion is now explicit, and request suppression keeps includeThoughts off. The added buffered tests check payload and event provenance; please also keep stream-path parity and adapter reuse across eligible/ineligible models explicit in the verification scope. Current head has successful readiness/hygiene/target checks but no functional CI run in its rollup; a historical cancelled gate is not the current result, and bot READY is not executed adapter coverage. Holding approval until head-bound functional CI evidence is available. No live Google request or local suite was run in this review.

[Ingwannu]

Intake/scoped review at 2856074117650b775fa5bb89ae1ad1b95f4b04df.

The new head adds thought-summary behavior and buffered/streaming eligibility coverage for direct Gemini/Vertex. Retain the explicit opt-in, noReasoningModels/empty-ladder exclusions and stream/buffered parity requested previously. The named current-head tests/CI, rather than a previous-head aggregate, must establish readiness.

Current-head functional workflows are awaiting fork approval; that is pending execution, not a passing test result. No local suite was run for this branch in this intake. No workflow approval, new scan, live configuration change or merge was performed. Required review/readiness gates remain in force.

[lidge-jun]

Carried into #7394 (squash 74463a2) on dev with a Co-authored-by trailer, as part of the B4 provider-adapter bundle. It ships in the next release (2.90.0). Thanks!