Initial commit: OpenClaw Skill Collection

6 custom skills (assign-task, dispatch-webhook, daily-briefing,
task-capture, qmd-brain, tts-voice) with technical documentation.
Compatible with Claude Code, OpenClaw, Codex CLI, and OpenCode.

openclaw-knowhow-skill/docs/infrastructure/gateway/gateway-lock.md

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+> ## Documentation Index
+> Fetch the complete documentation index at: https://docs.openclaw.ai/llms.txt
+> Use this file to discover all available pages before exploring further.
+
+# Gateway Lock
+
+# Gateway lock
+
+Last updated: 2025-12-11
+
+## Why
+
+* Ensure only one gateway instance runs per base port on the same host; additional gateways must use isolated profiles and unique ports.
+* Survive crashes/SIGKILL without leaving stale lock files.
+* Fail fast with a clear error when the control port is already occupied.
+
+## Mechanism
+
+* The gateway binds the WebSocket listener (default `ws://127.0.0.1:18789`) immediately on startup using an exclusive TCP listener.
+* If the bind fails with `EADDRINUSE`, startup throws `GatewayLockError("another gateway instance is already listening on ws://127.0.0.1:<port>")`.
+* The OS releases the listener automatically on any process exit, including crashes and SIGKILL—no separate lock file or cleanup step is needed.
+* On shutdown the gateway closes the WebSocket server and underlying HTTP server to free the port promptly.
+
+## Error surface
+
+* If another process holds the port, startup throws `GatewayLockError("another gateway instance is already listening on ws://127.0.0.1:<port>")`.
+* Other bind failures surface as `GatewayLockError("failed to bind gateway socket on ws://127.0.0.1:<port>: …")`.
+
+## Operational notes
+
+* If the port is occupied by *another* process, the error is the same; free the port or choose another with `openclaw gateway --port <port>`.
+* The macOS app still maintains its own lightweight PID guard before spawning the gateway; the runtime lock is enforced by the WebSocket bind.