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fix(ai): filter empty error assistant messages in transformMessages

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When 429/500 errors occur during tool execution, empty assistant messages
with stopReason='error' get persisted. These break the tool_use -> tool_result
chain for Claude/Gemini APIs.

Added centralized filtering in transformMessages to skip assistant messages
with empty content and no tool calls. Provider-level filters remain for
defense-in-depth.
This commit is contained in:
Mario Zechner 2026-01-16 22:34:58 +01:00
parent d2f9ab110c
commit fbb74bb29e
11 changed files with 125 additions and 8 deletions
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8
packages/ai/src/providers/transform-messages.ts
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@ -118,6 +118,14 @@ export function transformMessages<TApi extends Api>(messages: Message[], model:
existingToolResultIds = new Set();
}
// Skip empty assistant messages (no content and no tool calls)
// This handles error responses (e.g., 429/500) that produced no content
// All providers already filter these in convertMessages, but we do it here
// centrally to prevent issues with the tool_use -> tool_result chain
if (assistantMsg.content.length === 0 && toolCalls.length === 0) {
continue;
}
result.push(msg);
} else if (msg.role === "toolResult") {
existingToolResultIds.add(msg.toolCallId);