/**
 * mcpClient — connect to an MCP server, expose its tools to your Agent.
 *
 *   const slack = await mcpClient({
 *     name: 'slack',
 *     transport: { transport: 'stdio', command: 'npx', args: ['@example/slack-mcp'] },
 *   });
 *
 *   const tools = await slack.tools();   // → readonly Tool[]
 *   const agent = Agent.create({ ... }).tools(tools).build();
 *
 *   // ...
 *
 *   await slack.close();
 *
 * Pattern: Adapter (GoF) — translates MCP `listTools()` / `callTool()`
 *          into agentfootprint's `Tool` interface (schema + execute).
 *          Each MCP tool becomes ONE agentfootprint Tool. The agent's
 *          existing tool-call handler invokes `client.callTool()`
 *          inside the wrapped `execute`.
 *
 * Role:    Layer-3 integration. Sits next to `defineTool` — same
 *          shape, different source. Once tools land on the agent,
 *          the rest of the library doesn't know they came from MCP.
 *          Since 9.71.0 that is true of DECLARATIONS too: a server's
 *          `_meta` bag becomes `argumentsFrom` / `resultKind` / `owner`
 *          / `resultClass` / `resultCeiling` on the registered `Tool`,
 *          so the integrity checks, the placement mint and the identity
 *          joins arm for a remote tool exactly as for a local one. The
 *          reading NEVER throws — see `toolExtras.ts`.
 *
 * Emits:   N/A — wrapped tools emit the standard
 *          `agentfootprint.stream.tool_start` / `tool_end` events
 *          when the agent calls them. Add `name: '<mcp-server>'` to
 *          `McpClientOptions` so observability surfaces can group
 *          tool calls by server.
 *
 * Lazy-require pattern: the `@modelcontextprotocol/sdk` peer-dep
 * loads only when a consumer actually constructs a client. Tests
 * inject `_client` and skip the import path entirely.
 */
import type { McpClient, McpClientOptions, McpConnectionOptions } from './types.js';
/**
 * Connect to an MCP server. Returns an `McpClient` that exposes the
 * server's tools as agentfootprint `Tool[]` and a `close()` to tear
 * down the transport.
 *
 * Three ways to get a connection, and they are three because a browser can
 * only take the last two:
 *
 *   - `{ transport }` — the library loads the SDK through its Node loader and
 *     builds everything. The default, and what every Node consumer already
 *     does.
 *   - `{ transport, sdk }` — you supply the two SDK modules with static
 *     imports; the library still builds the transport, so gateway vending,
 *     `retryOnThrottle`, `headers` and your own `fetch` all keep working.
 *   - `{ connection }` — you built and connected the client yourself; the
 *     library only adapts its tools.
 *
 * @throws when the two arms are mixed, when a `connection` is not one, or when
 *   `@modelcontextprotocol/sdk` cannot be loaded (the message says which of
 *   "not installed" and "no Node loader here" actually happened), or when the
 *   transport fails to connect.
 */
export declare function mcpClient(opts: McpClientOptions | McpConnectionOptions): Promise<McpClient>;
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