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feat: use thoughtSignature bypass for Gemini tool part injection #270

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Merged
Tarquinen merged 5 commits into from
Jan 16, 2026
Merged

feat: use thoughtSignature bypass for Gemini tool part injection #270

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922ef17
Merge pull request #260 from Opencode-DCP/dev
Tarquinen Jan 14, 2026
bdc5f78
Merge pull request #264 from Opencode-DCP/dev
Tarquinen Jan 15, 2026
f0bdb8c
Merge pull request #267 from Opencode-DCP/dev
Tarquinen Jan 15, 2026
5bfba81
feat: use thoughtSignature bypass for Gemini tool part injection
Tarquinen Jan 16, 2026
e3006bc
format
Tarquinen Jan 16, 2026
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6 changes: 2 additions & 4 deletions lib/messages/inject.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ import { loadPrompt } from "../prompts"
import {
extractParameterKey,
buildToolIdList,
createSyntheticAssistantMessageWithToolPart,
createSyntheticAssistantMessage,
isIgnoredUserMessage,
} from "./utils"
import { getFilePathFromParameters, isProtectedFilePath } from "../protected-file-patterns"
Expand Down Expand Up @@ -149,7 +149,5 @@ export const insertPruneToolContext = (

const userInfo = lastUserMessage.info as UserMessage
const variant = state.variant ?? userInfo.variant
messages.push(
createSyntheticAssistantMessageWithToolPart(lastUserMessage, prunableToolsContent, variant),
)
messages.push(createSyntheticAssistantMessage(lastUserMessage, prunableToolsContent, variant))
}
24 changes: 6 additions & 18 deletions lib/messages/utils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ const isGeminiModel = (modelID: string): boolean => {
return lowerModelID.includes("gemini")
}

export const createSyntheticAssistantMessageWithToolPart = (
export const createSyntheticAssistantMessage = (
baseMessage: WithParts,
content: string,
variant?: string,
Expand All @@ -39,24 +39,11 @@ export const createSyntheticAssistantMessageWithToolPart = (
...(variant !== undefined && { variant }),
}

// For Gemini models, inject as text to avoid thought signature requirements
// Gemini 3+ has strict validation requiring thoughtSignature on functionCall parts
if (isGeminiModel(userInfo.model.modelID)) {
return {
info: baseInfo,
parts: [
{
id: SYNTHETIC_PART_ID,
sessionID: userInfo.sessionID,
messageID: SYNTHETIC_MESSAGE_ID,
type: "text",
text: content,
},
],
}
}
// For Gemini models, add thoughtSignature bypass to avoid validation errors
const toolPartMetadata = isGeminiModel(userInfo.model.modelID)
? { google: { thoughtSignature: "skip_thought_signature_validator" } }
: undefined

// For other models, use tool part for cleaner context
return {
info: baseInfo,
parts: [
Expand All @@ -75,6 +62,7 @@ export const createSyntheticAssistantMessageWithToolPart = (
metadata: {},
time: { start: now, end: now },
},
...(toolPartMetadata && { metadata: toolPartMetadata }),
},
],
}
Expand Down