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fix(agents): use text placeholders for historical attachments to avoid token overflow 

Historical images/PDFs were being re-downloaded and base64-encoded for
every API call, causing 200K+ token requests. Now only the current
message includes full attachment blocks; historical ones use text
placeholders like "[用户上传了图片: photo.png]".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
hailin 2026-02-07 08:22:02 -08:00
parent 06226a3d74
commit f2903bd67a
1 changed files with 8 additions and 4 deletions
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12
packages/services/conversation-service/src/infrastructure/agents/coordinator/coordinator-agent.service.ts
View File

@ -449,13 +449,17 @@ export class CoordinatorAgentService implements OnModuleInit {
): Promise<ClaudeMessage[]> {
const messages: ClaudeMessage[] = [];
// Convert previous messages
// Convert previous messages (use text placeholders for historical attachments to save tokens)
if (context.previousMessages) {
for (const msg of context.previousMessages) {
if (msg.attachments?.length) {
const contentBlocks = await this.buildAttachmentBlocks(msg.attachments);
contentBlocks.push({ type: 'text', text: msg.content });
messages.push({ role: msg.role, content: contentBlocks });
const placeholders = msg.attachments.map(
(att) => `[用户上传了${att.type === 'image' ? '图片' : '文件'}: ${att.originalName}]`,
);
messages.push({
role: msg.role,
content: placeholders.join('\n') + '\n' + msg.content,
});
} else {
messages.push({ role: msg.role, content: msg.content });
}