### read_briefing
Read a briefing previously produced for a specialist handover.

Use this exact Agent Zero tool-call shape:
```json
{"tool_name":"read_briefing","tool_args":{"briefing_id":"BRIEFING_ID"}}
```

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.