87 lines
3.5 KiB
Markdown
87 lines
3.5 KiB
Markdown
# Human Commands
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English | [中文](commands.zh.md)
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The human-command seam of [`dsh-commands`](../../packages/ui/commands). Interactive adapters use it to discover and directly execute plugin-owned commands for an exact agent without creating a model message. The [command Agent Note](../../.agents/notes/implemented/feature/2026-07-19-plugin-command-registration.md) owns dispatch and lifecycle rationale; the [package README](../../packages/ui/commands/README.md) owns composition and limitations.
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Source: [`packages/ui/commands/src/index.ts`](../../packages/ui/commands/src/index.ts)
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## Input metadata
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The seam exposes one optional unstructured-input hint. Command availability follows plugin composition: every adapter consuming the registry sees every effective definition.
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```ts type-equiv
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/** Immutable metadata for a command's optional unstructured input. */
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interface CommandInputDescriptor {
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/** Placeholder shown before the user supplies free-form input. */
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readonly hint: string
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}
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```
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## Definition
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`CommandDefinition` is the plugin-authored registration. The registry validates and freezes a detached effective definition.
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```ts type-equiv
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/** Plugin-owned command registration. */
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interface CommandDefinition {
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/** Lowercase command name without the leading slash. */
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readonly name: string
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/** Human-readable summary used in discovery UI. */
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readonly description: string
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/** Optional free-form input hint advertised to capable clients. */
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readonly input?: CommandInputDescriptor
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/** Execute against the receiving agent without sending the command to the model. */
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readonly handler: (invocation: CommandInvocation) => CommandResult | Promise<CommandResult>
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}
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```
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## Invocation and result
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The adapter owns cancellation and passes the exact target agent. `rawInput` begins immediately after the parsed name and retains the adapter-delivered separator and suffix. Results are direct UI outcomes, not tool results or session events.
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```ts type-equiv
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/** Invocation passed to one registered command handler. */
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interface CommandInvocation {
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/** Exact agent whose human-facing surface received the command. */
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readonly agent: Agent
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/** Exact text following the registered command name, including separator whitespace. */
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readonly rawInput: string
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/** Cancellation signal owned by the dispatching UI request. */
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readonly signal: AbortSignal
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}
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```
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```ts type-equiv
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/** Expected command outcome rendered directly by the dispatching UI. */
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type CommandResult =
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| { readonly kind: 'success'; readonly text?: string }
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| { readonly kind: 'error'; readonly text: string }
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```
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## Discovery and parsing views
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Adapters receive handler-free immutable descriptors after scope resolution. `parseCommand()` returns `ParsedCommand` before registry resolution; syntax-valid input can still name an unavailable command.
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```ts type-equiv
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/** Handler-free immutable command view returned to UI adapters. */
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interface CommandDescriptor {
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/** Lowercase command name without the leading slash. */
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readonly name: string
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/** Human-readable summary used in discovery UI. */
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readonly description: string
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/** Optional free-form input hint advertised to capable clients. */
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readonly input?: CommandInputDescriptor
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}
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```
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```ts type-equiv
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/** Syntactically valid slash command before registry resolution. */
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interface ParsedCommand {
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/** Lowercase command name without the leading slash. */
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readonly name: string
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/** Exact text following the command name. */
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readonly rawInput: string
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}
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```
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