### plan_mode_guard
Check or update the current Plan Mode and blocked action policy.

Use this exact Agent Zero tool-call shape:
```json
{"tool_name":"plan_mode_guard","tool_args":{"action":"check","project_name":"my_project"}}
```

Rules:
- Do not use this tool to discover, read, infer, validate, or print credential values.
- If the tool is not found, stop and report a runtime tool-registration failure. Do not switch to WebUI login, CSRF, HTTP cache-refresh, shell credential scans, or `.env`/config/log searches.