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Fix false positive billing error detection in agent messages #76

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Fix false positive billing error detection in agent messages #76

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19 changes: 18 additions & 1 deletion src/ai/message-handlers.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,20 @@ export function extractMessageContent(message: AssistantMessage): string {
return String(messageContent.content);
}

// Extracts only text content (no tool_use JSON) to avoid false positives in error detection
export function extractTextOnlyContent(message: AssistantMessage): string {
const messageContent = message.message;

if (Array.isArray(messageContent.content)) {
return messageContent.content
.filter((c: ContentBlock) => c.type === 'text' || c.text)
.map((c: ContentBlock) => c.text || '')
.join('\n');
}

return String(messageContent.content);
}

export function detectApiError(content: string): ApiErrorDetection {
if (!content || typeof content !== 'string') {
return { detected: false };
Expand Down Expand Up @@ -106,7 +120,10 @@ export function handleAssistantMessage(
): AssistantResult {
const content = extractMessageContent(message);
const cleanedContent = filterJsonToolCalls(content);
const errorDetection = detectApiError(content);
// Use text-only content for error detection to avoid false positives
// from tool_use JSON (e.g. security reports containing "usage limit")
const textOnlyContent = extractTextOnlyContent(message);
const errorDetection = detectApiError(textOnlyContent);

const result: AssistantResult = {
content,
Expand Down