mullion-hostlisted

# Mullion agent guide (pointer) If you're reading this, you're running as an agent CLI inside a Mullion-hosted session — regardless of which repo this session's working directory is in. Mullion gives a hosted session three ways to reach back into the system hosting it: the `mullion` CLI, an MCP server, and a hook socket — each scoped to the session itself, not full operator access. A session-specific copy of the full guide was written for you at: ``` $(dirname "$MULLION_HOOK_SOCKET")/$MULLION_SESSION_ID.agent-guide.md ``` Both `$MULLION_HOOK_SOCKET` and `$MULLION_SESSION_ID` are environment variables every Mullion-hosted session has. Read that file — it covers the four environment variables every session gets, what's reachable at session scope vs. full scope, CLI vs. MCP, browser automation, child-session spawning, and notifying the human — before reaching for any command syntax. This skill deliberately does not point at a path inside any particular repo's checkout (e.g. `docs/agent-guide.md`): it is delivered into every session Mullion hosts, in every project, and the per-session copy above is the only location guaranteed to exist regardless of which repo you're in.