/**
 * Coder mode on every runtime (rev 19, contract §4): codex's own tool items
 * → matched `tool_use`/`tool_result` start/end pairs with canonical inputs,
 * so ToolActivityTracker (tool-activity.ts) emits `full`-fidelity
 * `tool_activity` for codex the same way it does for claude.
 *
 * Wire shapes — live-captured 2026-09-29 from codex-cli 0.156.1
 * (`codex exec --json`, a shell command plus two apply_patch edits):
 *
 *   {"type":"item.started","item":{"id":"item_1","type":"command_execution",
 *    "command":"/usr/bin/bash -lc 'echo probe'","aggregated_output":"",
 *    "exit_code":null,"status":"in_progress"}}
 *   {"type":"item.completed","item":{... same id ...,"aggregated_output":"probe\n",
 *    "exit_code":0,"status":"completed"}}
 *   {"type":"item.started","item":{"id":"item_2","type":"file_change",
 *    "changes":[{"path":"/abs/note.txt","kind":"add"}],"status":"in_progress"}}
 *   {"type":"item.completed","item":{... same id ...,"status":"completed"}}
 *
 * `mcp_tool_call` ({server, tool, arguments, result?, error?, status}),
 * `web_search` ({query}) and `todo_list` ({items:[{text, completed}]}) follow
 * codex's documented `codex exec --json` item schema (docs/exec.md,
 * exec/src/exec_events.rs) — not observed live here. `reasoning`,
 * `agent_message` and `error` items are not tool calls and are skipped; any
 * other item type is passed through as kind `other` with its raw fields.
 *
 * codex numbers items per `exec` process (`item_0`, `item_1`, … restart on
 * every spawn, resumed turns included), so ids are prefixed per spawn to
 * stay unique across tool rounds and mailbox prompts.
 */
import type { CodexItem, CodexStreamEvent } from './codex-runner-types.js';
/**
 * Per-spawn tracker: turns `item.started`/`item.completed` tool items into
 * `tool_start`/`tool_end` stream events. A completed item that never
 * started (codex reports some items only on completion) gets its start
 * synthesized first, so every end has a start. `flush()` closes whatever is
 * still open when the process exits.
 */
export declare class CodexToolItems {
    private idPrefix;
    private open;
    constructor(idPrefix: string);
    private start;
    onItem(phase: 'started' | 'completed', item: CodexItem | undefined, threadId: string | undefined): CodexStreamEvent[];
    /** Ends for every call still open when the codex process exited. */
    flush(threadId: string | undefined): CodexStreamEvent[];
}
/** ADR-O001 D8 level → codex's `model_reasoning_effort`. codex accepts
 *  none|minimal|low|medium|high|xhigh|max (the API's own 400 lists them,
 *  verified with codex-cli 0.156.1); monomind's `off` is codex's `none`. */
export declare function codexEffortArgs(effort: string | undefined): string[];
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