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fix(ai): signature support for non-Anthropic models in Amazon Bedrock provider (#727)

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* Add Amazon Bedrock models test suite for agent package

Tests basic prompts, multi-turn conversations with thinking, and
synthetic thinking signatures across all Bedrock models.

Known issues are categorized and skipped:
- Models requiring inference profile (5)
- Invalid model IDs for us-east-1 region (6)
- Max tokens config exceeds model limit (2)
- No signature support in reasoningContent (10)
- Rejects reasoning content in user messages (25)
- Validates signature format - Anthropic newer models (7)

* Fix Bedrock signature support for non-Anthropic models

Only include the signature field in reasoningContent.reasoningText for
Anthropic Claude models. Other models (OpenAI, Qwen, Minimax, Moonshot,
etc.) reject this field with:
"This model doesn't support the reasoningContent.reasoningText.signature field"

This fix enables multi-turn conversations with thinking content for
10 additional Bedrock models that previously failed.

https://buildwithpi.ai/session?7e39c05f66ea358da3f993c267fe3e29

* Add a CHANGELOG entry
This commit is contained in:
Burak Varlı 2026-01-14 18:21:35 +00:00 • committed by GitHub
parent a497fccd06
commit 9a438465eb
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3 changed files with 318 additions and 5 deletions
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32
packages/ai/src/providers/amazon-bedrock.ts
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@ -290,6 +290,17 @@ function supportsPromptCaching(model: Model<"bedrock-converse-stream">): boolean
return false;
}
/**
* Check if the model supports thinking signatures in reasoningContent.
* Only Anthropic Claude models support the signature field.
* Other models (OpenAI, Qwen, Minimax, Moonshot, etc.) reject it with:
* "This model doesn't support the reasoningContent.reasoningText.signature field"
*/
function supportsThinkingSignature(model: Model<"bedrock-converse-stream">): boolean {
const id = model.id.toLowerCase();
return id.includes("anthropic.claude") || id.includes("anthropic/claude");
}
function buildSystemPrompt(
systemPrompt: string | undefined,
model: Model<"bedrock-converse-stream">,
@ -354,11 +365,22 @@ function convertMessages(context: Context, model: Model<"bedrock-converse-stream
case "thinking":
// Skip empty thinking blocks
if (c.thinking.trim().length === 0) continue;
contentBlocks.push({
reasoningContent: {
reasoningText: { text: sanitizeSurrogates(c.thinking), signature: c.thinkingSignature },
},
});
// Only Anthropic models support the signature field in reasoningText.
// For other models, we omit the signature to avoid errors like:
// "This model doesn't support the reasoningContent.reasoningText.signature field"
if (supportsThinkingSignature(model)) {
contentBlocks.push({
reasoningContent: {
reasoningText: { text: sanitizeSurrogates(c.thinking), signature: c.thinkingSignature },
},
});
} else {
contentBlocks.push({
reasoningContent: {
reasoningText: { text: sanitizeSurrogates(c.thinking) },
},
});
}
break;
default:
throw new Error("Unknown assistant content type");