import type { RouteContext } from './router.js';
import { type InputSource, type OutputFile } from './artifacts.js';
export declare const A2A_MAX_DEPTH_DEFAULT = 8;
export declare const A2A_TIMEOUT_MS_DEFAULT: number;
/** Hard upper bound — refuse caller-supplied `timeoutMs` larger than this so
 *  an agent can't accidentally write `timeoutMs: 86400000` and block A2A
 *  forever. Override with AGIM_A2A_MAX_TIMEOUT_MS. */
export declare const A2A_TIMEOUT_MS_MAX: number;
export declare function isA2AEnabled(): boolean;
export declare function getA2AMaxDepth(): number;
export declare const A2A_MAX_RESULT_CHARS_DEFAULT = 8000;
/** File the over-long result is spilled to, under the callee's _agim-output/. */
export declare const A2A_FULL_RESULT_FILE = "__a2a_result_full.md";
/** Caller-visible result cap in chars. `AGIM_A2A_MAX_RESULT_CHARS=0` disables
 *  truncation (return the full text); unset → default. */
export declare function getA2AMaxResultChars(): number;
/** Cap `result` for the caller's context; spill the full text to _agim-output/
 *  when truncated. Returns the (possibly shortened) string. Spill failure falls
 *  back to the full result rather than losing content. */
export declare function compressA2AResult(jobId: number, result: string): Promise<string>;
export declare function getA2ATimeoutMs(ctx?: {
    platform?: string;
    channelId?: string;
    threadId?: string;
}): number;
export declare function getA2AMaxTimeoutMs(): number;
export interface CallAgentOpts {
    /** Parent inline-job id (caller). NULL for top-level user calls. */
    parentJobId?: number | null;
    /** Caller's call_depth. New row will be set to caller + 1. */
    callerDepth?: number;
    /** Caller agent name (for self-call check). RouteContext doesn't carry
     *  this in its type today; bus.callAgent looks it up from RunContext
     *  + the audit log's per-run state. Optional — when unset we skip the
     *  self-call check; the depth ceiling still prevents runaway chains. */
    callerAgent?: string;
    /** Override timeout. Falls back to env / default. */
    timeoutMs?: number;
    /** Parent tool/turn cancellation. Aborting it terminates the callee in
     *  addition to A2A's own timeout controller. */
    signal?: AbortSignal;
    /** L2: files to drop in the callee's _agim-input/ before it runs.
     *  Each input has a target filename plus exactly one of:
     *    - fromAbsolutePath: copy/hard-link from a path on disk
     *    - fromCallerOutput: pull from caller's own _agim-output/
     *      (requires parentJobId so artifacts knows which job to read)
     *    - content:          inline string content */
    inputs?: InputSource[];
    /** L2: filenames the callee is expected to produce under _agim-output/.
     *  Missing files at return time become entries in `warnings`, not a
     *  hard failure — the callee is still allowed to do what it deems
     *  best. */
    expectOutputs?: string[];
    /** v1.2.139 — when the caller is currently in Plan Mode, propagate
     *  the flag to the callee so the sub-agent also runs read-only. Without
     *  this, a parent that hit /plan on would happily delegate write tasks
     *  to e.g. claude-code, which would launch with full write access and
     *  bypass the user's intent. */
    planMode?: boolean;
    /** Web chat activity accordion — live "Waiting for subagent" steps.
     *  Prefer this over RouteContext.onToolActivity when both are set. */
    onToolActivity?: import('./types.js').AgentSendOpts['onToolActivity'];
}
export type CallAgentResult = {
    ok: true;
    result: string;
    jobId: number;
    agent: string;
    durationMs: number;
    /** L2: absolute path of the artifacts directory for this run. */
    artifactsDir: string;
    /** L2: files the callee left under _agim-output/. */
    outputs: OutputFile[];
    /** L2: non-fatal advisories — e.g. expectOutputs that didn't show up. */
    warnings?: string[];
} | {
    ok: false;
    error: string;
    jobId?: number;
    agent?: string;
};
/** Programmatic A2A entry. Invokes `agentName` with `prompt` under the
 *  given RouteContext. Does NOT touch session history, does NOT deliver
 *  to IM. Result is returned to the caller verbatim. */
export declare function callAgentByName(agentName: string, prompt: string, ctx: RouteContext, opts?: CallAgentOpts): Promise<CallAgentResult>;
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