/**
 * Light mode — a minimal, low-token preset for small/local models.
 *
 * The preset restricts the session to the four core tools (read, write, edit,
 * bash) with shortened descriptions and undocumented parameter schemas,
 * replaces the default system prompt with a terse one, and disables
 * subagents, TodoWrite, skills, context files, and the mode-prompt appendix.
 * The goal is the smallest possible fixed per-turn surface (system prompt +
 * serialized tool schemas) so weak tool-callers waste no context on harness
 * boilerplate. bash subsumes the search tool: discovery happens via the shell.
 */
import type { AgentTool } from "@kolisachint/hoocode-agent-core";
import type { ToolInfo } from "./extensions/types.js";
/** The only tools a light session exposes. */
export declare const LIGHT_TOOL_NAMES: readonly ["read", "write", "edit", "bash"];
/**
 * Terse replacement for the default system prompt. buildSystemPrompt appends
 * the current date and working directory; nothing else rides along because
 * light mode also disables skills, context files, and the mode appendix.
 */
export declare const LIGHT_SYSTEM_PROMPT = "You are a coding agent. Use the tools to read, edit, and write files and run shell commands.\nSearch with bash (rg/find/ls). Prefer edit for changes; write for new files.\nBe concise. No preamble.";
/**
 * Environment flag signaling light mode to code that cannot see CLI flags or
 * settings — notably the hoo-core modes extension, which reads it to skip the
 * `<!-- hoo-core: mode= -->` system-prompt appendix. Same pattern as
 * WARM_SUBAGENTS_ENV / SUBAGENT_MAX_DEPTH_ENV.
 */
export declare const LIGHT_MODE_ENV = "HOOCODE_LIGHT";
/** Whether light mode was signaled through the environment. */
export declare function isLightModeEnv(): boolean;
/**
 * Build the four light tools for `baseToolsOverride`: the real tool
 * implementations wearing short descriptions and stripped parameter schemas.
 */
export declare function createLightTools(cwd: string): Record<string, AgentTool>;
/** Token breakdown of a session's fixed per-turn surface. */
export interface PromptSurface {
    /** Estimated tokens in the assembled system prompt. */
    systemPromptTokens: number;
    /** Estimated tokens across the serialized active tool schemas. */
    toolSchemaTokens: number;
    /** systemPromptTokens + toolSchemaTokens. */
    totalTokens: number;
    /** Per-tool breakdown of the serialized schema estimate. */
    tools: Array<{
        name: string;
        tokens: number;
    }>;
}
/**
 * What one tool costs on every request: its serialized `{name, description,
 * parameters}`, the three fields a provider re-sends each turn.
 *
 * Exported because the surface is worth showing for a tool that is *off* too —
 * `/settings` prices each toggle with it, and a disabled tool has no entry in a
 * measured surface precisely because it currently costs nothing.
 */
export declare function measureToolSchemaTokens(tool: ToolInfo): number;
/**
 * Measure the fixed per-turn surface a session sends on every request: the
 * assembled system prompt plus the serialized schemas (name, description,
 * parameters) of the active tools. Providers add their own envelope on top,
 * so treat the result as a floor estimate.
 */
export declare function measurePromptSurface(session: {
    systemPrompt: string;
    getActiveToolNames(): string[];
    getAllTools(): ToolInfo[];
}): PromptSurface;
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