/**
 * SubagentStart hook event.
 *
 * Fires when a subagent is spawned. A handler can inject additional
 * context the subagent will see. Supports a matcher on `agent_type`.
 * The subagent cannot be blocked from starting.
 * See https://code.claude.com/docs/en/hooks#subagentstart.
 *
 * @since 0.1.0
 */
import * as Effect from 'effect/Effect';
import * as Schema from 'effect/Schema';
import type { HookContext } from '../Context.js';
import type { HookDefinition } from '../Runner.js';
declare const Input_base: Schema.Class<Input, Schema.Struct<{
    readonly hook_event_name: Schema.Literal<"SubagentStart">;
    readonly agent_id: Schema.String;
    readonly agent_type: Schema.String;
    readonly session_id: Schema.String;
    readonly transcript_path: Schema.String;
    readonly cwd: Schema.String;
    readonly permission_mode: Schema.optionalKey<Schema.String>;
    readonly effort: Schema.optionalKey<typeof import("../Envelope.js").HookEffort>;
}>, {}>;
export declare class Input extends Input_base {
}
declare const HookSpecificOutput_base: Schema.Class<HookSpecificOutput, Schema.Struct<{
    readonly hookEventName: Schema.Literal<"SubagentStart">;
    readonly additionalContext: Schema.optional<Schema.String>;
}>, {}>;
export declare class HookSpecificOutput extends HookSpecificOutput_base {
}
declare const Output_base: Schema.Class<Output, Schema.Struct<{
    readonly continue: Schema.optional<Schema.Boolean>;
    readonly stopReason: Schema.optional<Schema.String>;
    readonly suppressOutput: Schema.optional<Schema.Boolean>;
    readonly systemMessage: Schema.optional<Schema.String>;
    readonly terminalSequence: Schema.optional<Schema.String>;
    readonly hookSpecificOutput: Schema.optional<typeof HookSpecificOutput>;
}>, {}>;
export declare class Output extends Output_base {
}
export declare const passthrough: () => Output;
export declare const addContext: (additionalContext: string) => Output;
export declare const define: (config: {
    readonly handler: (input: Input) => Effect.Effect<Output, unknown, HookContext.Service>;
}) => HookDefinition<Input, Output>;
/**
 * Build a SubagentStart hook that only handles matching `agent_type` values.
 *
 * @category Constructors
 * @since 0.1.0
 */
export declare const onMatcher: (config: {
    readonly matcher: string | RegExp;
    readonly handler: (input: Input) => Effect.Effect<Output, unknown, HookContext.Service>;
    readonly onMismatch?: (input: Input) => Effect.Effect<Output, unknown, HookContext.Service>;
}) => HookDefinition<Input, Output>;
export {};
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