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fix(agents): correct Claude API file size limits (image 5MB, PDF 25MB) 

Claude API enforces a hard 5MB limit per image (not 20MB as previously
set). PDFs have a 32MB total request limit; set individual PDF cap to
25MB to leave room for prompt/messages. The downloadAsBase64 method now
accepts a per-type maxSize parameter.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
hailin 2026-02-07 04:55:54 -08:00
parent e867ba5529
commit 5338bdfc0f
1 changed files with 9 additions and 7 deletions
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16
packages/services/conversation-service/src/infrastructure/agents/coordinator/coordinator-agent.service.ts
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@ -330,8 +330,10 @@ export class CoordinatorAgentService implements OnModuleInit {
/** 文本类文件最大嵌入大小 (超过则截断) */
private readonly MAX_TEXT_EMBED_SIZE = 50_000;
/** 二进制文件最大 base64 大小 (20MB，Claude API 限制) */
private readonly MAX_BINARY_SIZE = 20 * 1024 * 1024;
/** 图片最大 5MB（Claude API 硬限制） */
private readonly MAX_IMAGE_SIZE = 5 * 1024 * 1024;
/** PDF 最大 25MB（Claude API 整个请求 32MB 限制，留 7MB 给 prompt/messages） */
private readonly MAX_PDF_SIZE = 25 * 1024 * 1024;
/**
* 获取 file-service 内部地址
@ -364,13 +366,13 @@ export class CoordinatorAgentService implements OnModuleInit {
try {
if (att.type === 'image') {
const { base64, mediaType } = await this.downloadAsBase64(contentUrl, att.mimeType);
const { base64, mediaType } = await this.downloadAsBase64(contentUrl, att.mimeType, this.MAX_IMAGE_SIZE);
blocks.push({
type: 'image',
source: { type: 'base64', media_type: mediaType, data: base64 },
});
} else if (att.mimeType === 'application/pdf') {
const { base64 } = await this.downloadAsBase64(contentUrl, att.mimeType);
const { base64 } = await this.downloadAsBase64(contentUrl, att.mimeType, this.MAX_PDF_SIZE);
blocks.push({
type: 'document',
source: { type: 'base64', media_type: 'application/pdf', data: base64 },
@ -405,14 +407,14 @@ export class CoordinatorAgentService implements OnModuleInit {
* 从内部 URL 下载文件并转为 base64
* conversation-service 与 file-service 同在 Docker 网络内
*/
private async downloadAsBase64(url: string, mimeType: string): Promise<{ base64: string; mediaType: string }> {
private async downloadAsBase64(url: string, mimeType: string, maxSize: number): Promise<{ base64: string; mediaType: string }> {
const response = await fetch(url);
if (!response.ok) {
throw new Error(`HTTP ${response.status} from ${url}`);
}
const arrayBuffer = await response.arrayBuffer();
if (arrayBuffer.byteLength > this.MAX_BINARY_SIZE) {
throw new Error(`文件过大 (${(arrayBuffer.byteLength / 1024 / 1024).toFixed(1)}MB)，超过 ${this.MAX_BINARY_SIZE / 1024 / 1024}MB 限制`);
if (arrayBuffer.byteLength > maxSize) {
throw new Error(`文件过大 (${(arrayBuffer.byteLength / 1024 / 1024).toFixed(1)}MB)，超过 ${(maxSize / 1024 / 1024).toFixed(0)}MB 限制`);
}
const base64 = Buffer.from(arrayBuffer).toString('base64');
return { base64, mediaType: mimeType };