fix: enable reasoning for thinking models via kilo-gateway

[cbrunnkvist]

Summary

• Fixes bug where thinking models (e.g. kimi-k2-thinking) fail with "Reasoning is mandatory for this endpoint" when accessed via Kilo Gateway
• Adds automatic reasoning: { enabled: true } for models using @kilocode/kilo-gateway SDK that have reasoning capability and "thinking" in their model ID
• Adds tests for the fix

Changes

• packages/opencode/src/provider/transform.ts: Add logic to enable reasoning for thinking models via Kilo Gateway
• packages/opencode/test/provider/transform.test.ts: Add tests

Testing

Verified that kimi-k2-thinking now works:

• Before:

% bun run dev -- run --model kilo/moonshotai/kimi-k2-thinking "Vad heter du?"
$ bun run --cwd packages/opencode --conditions=browser src/index.ts run --model "kilo/moonshotai/kimi-k2-thinking" "Vad heter du?"

> code · moonshotai/kimi-k2-thinking

Error: Reasoning is mandatory for this endpoint and cannot be disabled.
^C

• After:

% bun run dev -- run --model kilo/moonshotai/kimi-k2-thinking "Vad heter du?"                                                                                                     [130]
$ bun run --cwd packages/opencode --conditions=browser src/index.ts run --model "kilo/moonshotai/kimi-k2-thinking" "Vad heter du?"

> code · moonshotai/kimi-k2-thinking

Kilo

Fixes #503

[kiloconnect]

WARNING: Potential reasoning overwrite — the block above (line 771) sets result["reasoning"] = { effort: "high" } for kilo-gateway models whose api.id includes "gemini-3". This new block will overwrite that value with { enabled: true } if a model's api.id contains both "gemini-3" and "thinking" (e.g. a hypothetical google/gemini-3-thinking).

This is unlikely with current model names, but the ordering dependency is fragile. Consider adding an early-return guard (e.g. && !input.model.api.id.includes("gemini-3")) or restructuring to make the precedence explicit.

[kiloconnect]

Code Review Summary

Status: 1 Issue Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	1
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
packages/opencode/src/provider/transform.ts	789	Potential reasoning overwrite — the gemini-3 block (line 771) sets { effort: "high" } and this new block could overwrite it with { enabled: true } if a model ID contains both "gemini-3" and "thinking"

Files Reviewed (2 files)

• packages/opencode/src/provider/transform.ts - 1 issue
• packages/opencode/test/provider/transform.test.ts - 0 issues

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