Feishu Doc

Read, write, and manage Feishu/Lark documents (Docs) using the Feishu Open API.

• Base URL: https://open.feishu.cn/open-apis
• Auth: obtain a tenant access token via POST /auth/v3/tenant_access_token/internal with {"app_id": ..., "app_secret": ...}. Cache the token (valid 2 hours) in memory.
• List documents: GET /docx/v1/documents — returns document list for the current user.
• Get document content: GET /docx/v1/documents/{document_id}/raw_content — returns Markdown-like plain text.
• Get blocks: GET /docx/v1/documents/{document_id}/blocks — returns structured block tree.
• Create a document: POST /docx/v1/documents with {"folder_token": "...", "title": "..."}.
• Update a block: PATCH /docx/v1/documents/{document_id}/blocks/{block_id} with block content.
• Append content: use POST /docx/v1/documents/{document_id}/blocks/{parent_block_id}/children to add new blocks.
• Support block types: paragraph, heading1–heading9, bullet, ordered, code, quote, callout, table.
• Always refresh the access token before API calls if it may have expired.