kagi-kan-mcp

# AGENTS.md This file provides guidance to LLM agents when working with code in this repository. ## Common Commands ### Development ```bash npm install # Install dependencies npm start # Run the MCP server npm run dev # Run with Node.js inspector for debugging ``` ### Testing & Debugging ```bash npx @modelcontextprotocol/inspector node src/index.js # Launch MCP Inspector at localhost:5173 ``` ## Architecture Overview This is a **Model Context Protocol (MCP) server** that provides Kagi search and summarization tools to Claude Desktop/Code. The server acts as a bridge between Claude and the `kagi-ken` package for accessing Kagi's APIs. ### Core Architecture Pattern **MCP Server Structure**: The main server (`src/index.js`) uses the `@modelcontextprotocol/sdk` to create an MCP server that registers tools and handles communication via stdio transport. **Tool-Based Architecture**: Each capability is implemented as a separate MCP tool: - `kagi_search_fetch` - Multi-query concurrent search - `kagi_summarizer` - URL/content summarization **Token Resolution System**: Authentication follows the same pattern as `kagi-ken-cli` with priority-based token resolution: 1. `KAGI_SESSION_TOKEN` environment variable 2. `~/.kagi_session_token` file ### Key Components **`src/index.js`** - Main server class that: - Creates McpServer instance - Registers tools with Zod schemas for input validation - Sets up stdio transport and error handling **`src/tools/`** - Tool implementations: - Each tool exports both the handler function and config object - Handlers return MCP-compliant response format with `content` array - Input validation uses direct Zod schema objects (not `z.object()`) **`src/utils/auth.js`** - Token resolution that mirrors `kagi-ken-cli`: - `resolveToken()` - Priority-based token resolution - `readTokenFromFile()` - File-based token reading - Comprehensive error messages for missing tokens **`src/utils/formatting.js`** - Result formatting: - `formatSearchResults()` - Matches official Kagi MCP output format - `getEnvironmentConfig()` - Unified config with token resolution ### Critical Implementation Details **MCP Schema Format**: Input schemas must be plain objects with Zod validators as values, NOT `z.object()` wrappers: ```js // Correct export const schema = { queries: z.array(z.string()).min(1) }; // Incorrect export const schema = z.object({ queries: z.array(z.string()).min(1) }); ``` **Concurrent Search Processing**: Search tool uses `Promise.allSettled()` with individual timeouts to handle multiple queries concurrently, maintaining result order and partial success handling. **Result Formatting Compatibility**: Output format precisely matches the official Python Kagi MCP server to ensure tool interface compatibility across implementations. ## Dependencies - `@modelcontextprotocol/sdk` - MCP server implementation - `kagi-ken` - Kagi API client (GitHub dependency, not npm) - `zod` - Input validation schemas ## Configuration Requires Kagi session token via environment variable or file. Server automatically detects token source and provides clear error messages for setup issues.