/**
 * selfExplainPort — the seam `.selfExplain()` plugs into.
 *
 * Pattern: Port + a one-slot registry (the `devWarn.ts` / `devWarnHost.ts`
 *          shape of the injection engine).
 * Role:    core/ layer. `AgentBuilder.selfExplain` records the options and
 *          `AgentBuilder.build` asks this port for the three pieces the trace
 *          toolpack supplies: the binding that keeps each finished turn's
 *          evidence, the methodology skill, and the skill-scoped provider of
 *          the trace tools. The toolpack reads a FINISHED run, so it sits above
 *          the agent in the layer table and the agent may not import it; the
 *          agent names only this port, and the toolpack registers itself here
 *          (`trace-toolpack/selfExplainHost.ts` · `selfExplainExtension`).
 * Emits:   nothing.
 *
 * WHO REGISTERS. `selfExplainHost.ts` registers at load, and every published
 * door that hands out the agent takes `Agent` and `AgentBuilder` FROM that
 * host, so the registration travels with the class: a consumer on a door never
 * meets the refusal below, and a bundler that skips a barrel cannot drop it
 * (the host is listed in package.json `sideEffects`). Only a deep import of
 * the builder's own module, past every door, reaches `build()` unregistered.
 */
import type { Injection } from '../../injection-engine/types.js';
import type { SelfExplainBinding, SelfExplainOptions } from '../../trace-toolpack/selfExplain.js';
import type { ToolProvider } from '../../tools/toolProvider.js';
/** What the trace toolpack hands the agent builder for `.selfExplain()`. */
export interface SelfExplainExtension {
    /** A fresh binding per `build()`, so two built agents never share evidence. */
    binding(options: SelfExplainOptions): SelfExplainBinding;
    /** The skill `.selfExplain()` mounts: the methodology body only. */
    skill(options: SelfExplainOptions): Injection;
    /** The trace tools behind the skill's activation, composed with the consumer's own provider. */
    toolProvider(binding: SelfExplainBinding, options: SelfExplainOptions, existing?: ToolProvider): ToolProvider;
}
/** The refusal `build()` raises when `.selfExplain()` was asked for and nothing registered. */
export declare const SELF_EXPLAIN_UNREGISTERED: string;
/**
 * Plug the trace toolpack into the builder. Called once, at load, by
 * `selfExplainHost.ts`; registering the same extension again is a no-op, and a
 * DIFFERENT one is refused rather than silently replacing the first.
 */
export declare function registerSelfExplain(extension: SelfExplainExtension): void;
/** The registered extension, or the refusal when there is none. Read by `AgentBuilder.build`. */
export declare function requireSelfExplain(): SelfExplainExtension;