/**
 * Agent adapter detection.
 *
 * Inspects the incoming request to select the appropriate AgentAdapter.
 * Falls back to the OpenCode adapter for backward compatibility.
 */
import type { Context } from "hono";
import type { AgentAdapter } from "../adapter";
/**
 * Detect which agent adapter to use based on request headers.
 *
 * Detection rules (evaluated in order):
 * 1. x-meridian-agent header               → explicit adapter override
 * 2. x-opencode-session or x-session-affinity header → OpenCode adapter
 * 3. User-Agent starts with "opencode/"     → OpenCode adapter
 * 4. User-Agent starts with "factory-cli/"  → Droid adapter
 * 5. User-Agent starts with "Charm-Crush/"  → Crush adapter
 * 6. User-Agent starts with "claude-cli/"  → Claude Code adapter
 * 7. litellm/* UA or x-litellm-* headers   → LiteLLM passthrough adapter
 * 8. Default                                → MERIDIAN_DEFAULT_AGENT env var, or OpenCode
 */
export declare function detectAdapter(c: Context): AgentAdapter;
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