How to Build OpenClaw Channel Plugins

A channel plugin connects OpenClaw to a messaging platform. The docs are clear about the division of responsibility: the plugin does not need to invent its own send, edit, or react tool because core owns the shared message tool. The plugin owns provider-specific config, security, pairing, session grammar, outbound delivery, threading, and optional heartbeat typing. That split keeps new channels powerful without fragmenting the agent-facing tool surface.

30-second answer

Start with the basic plugin package and manifest, then implement the channel adapter surfaces. Model the account config, DM policy, allowlists, pairing flow, target parsing, outbound delivery, threading semantics, and media behavior. If your platform needs typing indicators for heartbeat targets, expose heartbeat.sendTyping and heartbeat.clearTyping. If you add media-source parameters, declare them through describeMessageTool so core can normalize sandbox paths safely.

Where it fits

Build a channel plugin when OpenClaw needs to live inside a new messaging platform, not when you only need a webhook or one-off API call. A real channel has inbound messages, identity, sessions, replies, target resolution, and outbound delivery. If those concepts matter, the channel plugin shape gives you the right seams.

Docs-grounded facts

• Core owns one shared message tool.
• Channel plugins own config, security, pairing, session grammar, outbound delivery, and threading.
• heartbeat.sendTyping and clearTyping are optional channel capabilities.
• describeMessageTool mediaSourceParams declares provider-specific media fields.
• messaging.resolveSessionConversation is the canonical conversation parsing hook.
• Hot entrypoints should avoid importing heavy runtime clients.

Set it up deliberately

Keep hot entrypoints narrow. The docs recommend channel-plugin-api.ts exporting the plugin object without importing setup wizards, transport clients, socket listeners, subprocess launchers, or service startup modules. Runtime pieces should load from registerFull, runtime setters, or lazy capability adapters. If setup/status surfaces need metadata before runtime starts, add a setup-safe openclaw.setupEntry in package.json.

Use it safely

Security is not optional. Model DM policy and allowlists, use shared approval capability helpers when the channel needs native approvals, and preserve accountId plus approvalKind end to end. For mentions, gather local facts such as reply-to-bot, quoted-bot, thread participation, and service-message exclusions, then pass them through shared mention gating policy helpers instead of hardcoding final policy in every channel.

Common mistakes

The common mistake is putting channel-specific branches into core or duplicating the message tool. The docs push the other way: core owns generic dispatch and the shared message tool, while plugins expose capability seams. Another mistake is loading heavy clients from setup or discovery paths. That makes read-only commands slow and fragile.

Verification checklist

Write target-resolution tests, account inspection tests that do not leak secrets, inbound mention tests, outbound delivery tests, and threading tests. Then run a real end-to-end DM and thread reply. For media channels, verify sandbox path normalization and attachment handling with allowed media-source params.

Playbook angle

The OpenClaw Playbook’s channel-plugin rule is simple: respect core boundaries. A good channel feels native to users while still looking like the same OpenClaw message surface to agents.

Operator note

How to Build OpenClaw Channel Plugins works best when it is written into a small runbook instead of left as tribal knowledge. Record the intended owner, the exact config surface, the channel where results should appear, the allowed inputs, the expected output, and the rollback step. OpenClaw gives agents broad tools, but the durable value comes from making each tool boring, repeatable, and auditable. I would rather have one well-scoped channel plugin workflow that survives a restart than five clever demos nobody can safely run next week. If the runbook cannot explain when not to use it, keep refining before automation becomes default.

Keep the final proof simple: name the source doc, run the smallest check that proves the path works, and save the result where the next operator will look first.