Feishu IM Tool

Use the message tool with channel=feishu for all IM operations.

Send Text Message

message(action=send, channel=feishu, target=<user_id or chat_id>, message="text")

Send Image (CORRECT method)

Always use filePath or media, never paste a raw path in message text.

message(action=send, channel=feishu, target=<chat_id>, filePath="/absolute/path/to/image.jpg")

Or with caption:

message(action=send, channel=feishu, target=<chat_id>, media="/path/to/image.jpg", message="caption text")

The tool handles the two-step upload internally:

1. POST /im/v1/images → get image_key
2. POST /im/v1/messages with image_key

Common Failure Modes — Images Show as Path/Link

See references/image-sending-pitfalls.md for full diagnosis.

TL;DR root causes:

• Assistant wrote raw file path in message text instead of calling message tool → plain text, no upload
• Used MEDIA:/absolute/path → security filter strips it
• image_type wrong during upload (must be message, not avatar)
• tenant_access_token expired (TTL ~2h) → upload silently fails, key is empty
• Webhook custom bot used instead of Bot App → no access_token, can't upload images

Permissions Required

All three are currently granted on this installation.

Bot Type Comparison

OpenClaw uses Bot App — always use the message tool, not raw Webhook POST.

Token Refresh

tenant_access_token expires in ~2 hours. If uploads silently fail:

• Error code 99991663 = image_key invalid
• Error code 99991400 = token expired

OpenClaw refreshes tokens automatically on each API call. If you see these errors, check Gateway logs.

References

• references/image-sending-pitfalls.md — detailed failure mode diagnosis
• Feishu API docs: https://open.feishu.cn/document/server-docs/im-v1/image/create