Bug type

Regression (worked before, now fails)

Beta release blocker

No

Summary

Bug: Image attachments dropped even when model supports images

Environment: OpenClaw 2026.4.14 / 2026.4.15, minimax/MiniMax-M2.7

Problem: When sending images via webchat, the image appears as a thumbnail momentarily then disappears. The gateway log shows:

parseMessageWithAttachments: 1 attachment(s) dropped — model does not support images Expected: Image should be processed and sent to the agent.

Config:

agents.defaults.model.primary: minimax/MiniMax-M2.7 minimax model has input: ["text", "image"] configured models.mode: replace Logs show the model IS minimax/MiniMax-M2.7 but attachments are still dropped. Also, setting models.mode: replace changed the behavior — now image URLs (from OSS) are shown in chat instead of the image disappearing entirely, suggesting a merge-mode bug with model capability detection.

Steps to reproduce

Run: openclaw config set models.mode replace

1. Set minimax/MiniMax-M2.7 as the primary model (ensure model has image capability configured)
2. Open webchat interface
3. Send a message with an image attachment
4. Observe — image disappears or shows as a URL link instead of being processed

Expected: Image is analyzed and agent can see it Actual: Image dropped with log: "parseMessageWithAttachments: 1 attachment(s) dropped — model does not support images"

Expected behavior

Images should be processed and sent to the agent when the model configuration declares image support.

Prior behavior: With models.mode: replace, images appear as URLs in chat (indicating images reached OSS/attachment system). This proves the model CAN handle images if properly routed.

Reference: minimax model has input: ["text", "image"] configured — capability is declared but not respected at message parse time.

Actual behavior

Images are dropped at parse time, even though the model is configured with image support.

Evidence from gateway log: parseMessageWithAttachments: 1 attachment(s) dropped — model does not support images

User-visible result: Image thumbnail appears briefly then disappears, or image is converted to a URL link in chat. The agent receives no image data and cannot analyze it.

Note: When models.mode is set to replace, the symptom changes from "image disappears" to "image shows as URL" — suggesting the capability check runs in merge/parse logic before the mode replacement takes effect.

OpenClaw version

2026.4.15

Operating system

Win10 pro 22h2 / Ubuntu 22.04

Install method

No response

Model

MiniMax-M2.7

Provider / routing chain

openclaw->minimax

Additional provider/model setup details

No response

Logs, screenshots, and evidence

Impact and severity

No response

Additional information

No response