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Registrars for agent-visible tools, custom commands, node-host commands, and widget presenters. Part of the Plugin SDK overview.

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Tools and commands

Use defineToolPlugin for simple tool-only plugins with fixed tool names. Use api.registerTool(...) directly for mixed plugins or fully dynamic tool registration. Explicit widget presenters declare a unique model-visible target such as node_panel. Current-channel presenters use target: "current_channel", provide a synchronous match(context) predicate over trusted delivery facts, and declare supported source kinds and delivery limits. Multiple transport presenters may coexist, but core selects an implicit route only when exactly one matches. Core validates the canonical show_widget schema, composes the bounded HTML document, and passes immutable HTML plus an optional hosted URL to present(...). Presenters return either a generic message receipt or a node receipt. Expected availability and presentation failures use the closed error result instead of throwing; core falls back inline only for an actual inline-widgets client and otherwise surfaces the failure. Computer Use providers use registerComputerUseProvider(api, provider) from openclaw/plugin-sdk/computer-use. It registers the shared screen.snapshot/computer.act node-host envelope once while the provider keeps its driver, frame, availability, and execution lifecycle local. Its optional prepare(context) hook settles native startup before the node’s first capability declaration, without opening a Computer Use execution. Plugin commands can set agentPromptGuidance when the agent needs a short, command-owned routing hint. Keep that text about the command itself; do not add provider- or plugin-specific policy to core prompt builders. Commands may also declare a bounded client presentation action for parsed no-argument invocations:
The action union is closed and intentionally does not accept routes, callbacks, URLs, or arbitrary client data. Supporting clients handle the action only when they can complete it; otherwise the command follows its normal remote path. This metadata expresses presentation intent, not authorization: the Gateway remains authoritative for every RPC the client flow performs. Guidance entries may be legacy strings, which apply to every prompt surface, or structured entries:
Structured surfaces may include openclaw_main, codex_app_server, cli_backend, acp_backend, or subagent. pi_main remains a deprecated alias for openclaw_main. Omit surfaces for intentional all-surface guidance. Do not pass an empty surfaces array; it is rejected so accidental scope loss does not become global prompt text. Native Codex app-server developer instructions are stricter than other prompt surfaces: only guidance explicitly scoped to codex_app_server is promoted into that higher-priority lane. Legacy string guidance and unscoped structured guidance remain available to non-Codex prompt surfaces for compatibility. Node-host commands run on the connected node host, not inside the Gateway process. If agentTool is present, the node publishes a descriptor after a successful Gateway connect; the Gateway exposes it to agent runs only while that node is connected and only if the descriptor’s command is in the node’s approved command surface. Set agentTool.defaultPlatforms to opt a non-dangerous command into the default node command allowlist; otherwise require explicit gateway.nodes.commands.allow or a node-invoke policy. agentTool.name must be provider-safe: start with a letter, use only letters, digits, underscores, or hyphens, and stay within 64 characters. MCP-backed node tools can set agentTool.mcp metadata so catalog and tool-search surfaces can show the remote MCP server/tool identity, but execution still goes through the advertised node command.