openclaw - 💡(How to fix) Fix [Bug]: exec tool call is invoked with empty arguments, missing required command [2 comments, 2 participants]

Bug type

Behavior bug (incorrect output/state without crash)

Beta release blocker

No

Summary

The agent attempted to invoke the exec tool with empty arguments {}, causing validation to fail because the required command property was missing.

Steps to reproduce

1. start openclaw 5.7
2. use a agent to generate long context to json (always in subagent)

Expected behavior

When the agent invokes the exec tool, the tool call arguments should include the required command property.

Actual behavior

The agent failed with the following validation error:

Validation failed for tool "exec":

command: must have required properties command

Received arguments: {}

OpenClaw version

2026.5.7 2026.5.7 2026.4.23

Operating system

windows 11

Install method

No response

Model

qwen3.6 27B

Provider / routing chain

openclaw -> custom OpenAI-compatible endpoint -> local vLLM serving Qwen3.6-27B

Additional provider/model setup details

The model is deployed locally with vLLM and exposed through an OpenAI-compatible API endpoint. The endpoint is configured in OpenClaw as a custom provider.

Logs, screenshots, and evidence

Impact and severity

No response

Additional information

No response