A2ASearch MCP Server is a search tool for the AI agent ecosystem, provided in the form of an MCP server. It aggregates and indexes 10,752 AI agents, MCP servers, CLI tools, and agent skills, with the goal of covering major MCP servers, CLI tools, coding agents, and agent skills within a single package, allowing users to search directly from Claude, Cursor, or any MCP client.
In terms of purpose, this tool is used to solve the problem of fragmented tools in the MCP and agent ecosystem and the lack of a unified lookup entry point. The material states that there are thousands of tools in the ecosystem distributed across different sources, and A2ASearch indexes these tools to provide unified search.
Main capabilities include: searching the entire directory by keyword; getting complete details of a specific agent, including README, capabilities, and stars; browsing popular agents by type and sorting. It provides three tool capabilities: search, get details, and browse popular. The material does not provide more descriptions of tool capabilities.
In terms of usage, it can be integrated through MCP client configuration. Claude Desktop requires adding it to ~/Library/Application Support/Claude/claude_desktop_config.json; Cursor adds it to .cursor/mcp.json; Windsurf adds it to ~/.codeium/windsurf/mcp_config.json; Cline, Continue, and OpenClaw use the same format to add it to their respective MCP configuration files. The material does not show the specific configuration JSON content. After installation, you can ask questions with natural language prompts, for example, searching for database-related MCP servers, finding the currently most popular AI coding agents, finding agent skills related to web browsing, asking whether a Notion MCP server exists, and getting complete details of the ollama agent. If you do not use the MCP server, you can directly use the command-line tool. The material mentions that it can be installed and used or run directly without installation, but does not give the specific command content. The MCP server wraps the free A2ASearch REST API, and that API can also be called directly without authentication.
Applicable scenarios include: developers or AI users need to quickly discover AI agents, MCP servers, CLI tools, and agent skills from within an MCP client; need to view detailed information about a certain agent; need to learn about a certain type of popular tool. This index is maintained by the community, and missing tools can be submitted; after submission, they are reviewed and added within 24–48 hours.
Limitations and requirements: Node.js 22 or higher is required, with Node.js 24 LTS recommended. No authentication, no API key, and free. Test coverage includes MCP initialization and tool invocation, input validation, API errors and timeouts, and two CLI entry points. The request timeout is 15 seconds; the result count limit must be an integer between 1 and 20. The material does not provide more information such as pricing, platform scope, or precise data update frequency.
