Feishu Bitable Attachment

Overview

This skill uploads files to Feishu (Lark) Bitable attachment fields through the material upload flow:

1. Get source file (local copy, URL download, or Feishu message download)
2. Upload to Bitable upload endpoint with parent_type=bitable_file
3. Get file_token from upload response
4. Create/Update record with attachment field

Key design: This is a general-purpose skill for ANY Bitable your app can access. Nothing is hardcoded.

Verification Status

Local Tests Passed

• All Python modules pass syntax check (py_compile)
• All custom exception classes are properly imported
• File not found raises SkillFileNotFoundError (not NameError)
• Input validation raises SkillInputError for missing parameters
• All payload example files are valid JSON
• main.py --help runs successfully

Requires Real Environment Verification

• Bitable record update/create response format
• Table/field listing API response structure
• Record search API filter syntax

If any API calls fail in your environment, check references/feishu-api-notes.md for extensibility points.

Supported Source Types

Target Resolution

This skill supports flexible target specification to work with any Bitable:

Table Specification (priority: table_id > table_name)

• Provide table_id directly for fastest resolution
• Or provide table_name for automatic lookup (lists all tables and matches by name)

Field Specification (priority: field_id > field_name)

• Provide field_id directly for fastest resolution
• Or provide field_name for automatic lookup (lists all fields and matches by name)

Record Specification

• Provide record_id to update existing record
• Or provide lookup to search for record by field value
• Or omit both to create new record

Input JSON Structure

{
  "target": {
    "app_token": "bascxxxxxxxxxxxxx",
    "table_id": "tblxxxxxxxxxx",
    "table_name": "",
    "record_id": "recxxxxxxxxxx",
    "field_id": "fldxxxxxxxxxx",
    "field_name": "附件",
    "lookup": {
      "field_name": "合同编号",
      "field_id": "",
      "value": "HT-2026-001"
    },
    "allow_create_if_lookup_missing": false
  },
  "source": {
    "type": "local",
    "ref": "/path/to/file.pdf"
  },
  "append": true
}

Target Parameters

Lookup Config

"lookup": {
  "field_name": "合同编号",
  "field_id": "",
  "value": "HT-2026-001"
}

Source Parameters

Append Mode

Upload Flow

Small Files (≤20MB)

Direct upload to material endpoint:

POST /open-apis/drive/v1/upload
multipart/form-data fields:
  - file: \x3Cfile content>
  - file_name: filename
  - size: file size in bytes
  - parent_type: bitable_file
  - parent_node: {app_token}
  - extra: {"drive_route_token": "{app_token}"}

Large Files (>20MB)

Chunked upload in 5MB parts:

1. POST /open-apis/drive/v1/chunked_upload/prepare → upload_id
2. POST /open-apis/drive/v1/chunked_upload (per part) → etag
3. POST /open-apis/drive/v1/chunked_upload/finish → file_token

Environment Variables

Set these before running:

export FEISHU_APP_ID=your_app_id
export FEISHU_APP_SECRET=your_app_secret
export FEISHU_BASE_URL=https://open.feishu.cn  # optional

Usage Examples

Local file with known record_id

python scripts/main.py --input payload.local.json

URL download with replace mode

python scripts/main.py --input payload.url.json

Feishu message attachment

python scripts/main.py --input payload.feishu_message.json

Auto-resolve table by name

python scripts/main.py --input payload.table_name.json

Lookup record by field value

python scripts/main.py --input payload.lookup.json

Create new record with attachment

python scripts/main.py --input payload.create_record.json

Basic Verification

Run syntax check before use:

python -m py_compile scripts/*.py

This verifies:

• All Python modules have valid syntax
• No undefined variables or imports

Output

Success

{
  "ok": true,
  "file_token": "vobxxxxxxxxxx",
  "app_token": "bascxxxxxxxxxx",
  "table_id": "tblxxxxxxxxxx",
  "table_name": "合同归档",
  "record_id": "recxxxxxxxxxx",
  "field_name": "附件",
  "field_id": "fldxxxxxxxxxx",
  "upload_type": "direct",
  "attachment_count": 3,
  "mode": "append",
  "message": "Successfully uploaded 'report.pdf'..."
}

Error

{
  "ok": false,
  "error": "Table 'xxx' not found. Available tables: 表 1, 表 2",
  "error_type": "resolve_error"
}

Common Errors

Why This Skill Works with Any Bitable

This skill is not hardcoded to a specific Bitable:

1. Dynamic app_token: Read from input, not hardcoded
2. Dynamic table resolution: Supports table_id (direct) or table_name (API lookup)
3. Dynamic field resolution: Supports field_id (direct) or field_name (API lookup)
4. Dynamic record resolution: Supports record_id, lookup search, or create-new mode

References

See references/feishu-api-notes.md for:

• Why file_token from IM/Drive cannot be reused directly
• Why upload to bitable_file upload point is required
• API implementation notes and extensibility points
• Known uncertainties that may need environment-specific verification