deepseek-harness/website/zh-CN/api/harness/commands.md

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# ctx.commands

`CommandService` — provided by `@deepseek-ai/dsh-commands`.

Human-command registry. Plain-context definitions are global; definitions registered through a command-injected child of an agent context shadow globals for that agent.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/ui/commands/src/index.ts#L207)

### ctx.commands.register(definition)

```ts website-api
/**
 * Register a global or calling-agent-scoped command.
 * @param definition - discovery metadata and direct UI handler.
 * @returns the exact effect disposer that unregisters this definition.
 */
register(definition: CommandDefinition): () => void
```

Register a global or calling-agent-scoped command.

- `definition` — discovery metadata and direct UI handler.

**Returns** the exact effect disposer that unregisters this definition.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/ui/commands/src/index.ts#L220)

### ctx.commands.list(agent)

```ts website-api
/**
 * List the effective immutable command descriptors for one agent.
 * @param agent - exact receiving agent and scoped-layer key.
 * @returns name-sorted descriptors after scoped shadowing.
 */
list(agent: Agent): readonly CommandDescriptor[]
```

List the effective immutable command descriptors for one agent.

- `agent` — exact receiving agent and scoped-layer key.

**Returns** name-sorted descriptors after scoped shadowing.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/ui/commands/src/index.ts#L247)

### ctx.commands.find(agent, name)

```ts website-api
/**
 * Resolve one effective command definition.
 * @param agent - exact receiving agent and scoped-layer key.
 * @param name - command name without a slash.
 * @returns the scoped shadow or global definition.
 */
find(agent: Agent, name: string): CommandDefinition | undefined
```

Resolve one effective command definition.

- `agent` — exact receiving agent and scoped-layer key.
- `name` — command name without a slash.

**Returns** the scoped shadow or global definition.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/ui/commands/src/index.ts#L260)

### ctx.commands.execute(agent, line, signal)

```ts website-api
/**
 * Parse and execute a known command without sending it to the model.
 * @param agent - exact receiving agent.
 * @param line - complete slash-command line.
 * @param signal - cancellation signal owned by the UI request.
 * @returns a detached result, or `undefined` when syntax or name does not resolve.
 */
async execute( agent: Agent, line: string, signal: AbortSignal, ): Promise<CommandResult | undefined>
```

Parse and execute a known command without sending it to the model.

- `agent` — exact receiving agent.
- `line` — complete slash-command line.
- `signal` — cancellation signal owned by the UI request.

**Returns** a detached result, or `undefined` when syntax or name does not resolve.

[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/ui/commands/src/index.ts#L271)