agentbase-mcp

MCP server for the AgentBase agent instruction registry. Gives any MCP-compatible AI agent direct access to search and retrieve instruction files.

What It Does

AgentBase is an open registry of agent instruction files — system prompts, skills, workflows, domain packs, safety filters, and orchestration patterns. This MCP server wraps the registry's HTTP endpoints and exposes them as structured tools.

Tools:

• search_registry — search by keyword, category, quality score

• get_instruction — fetch a full instruction file (or just the deployable text)

• list_categories — see all categories with file counts

• get_featured — get all quality 90+ featured files

Install

npm install -g agentbase-mcp

Or use npx (no install):

npx agentbase-mcp

Configure

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "agentbase": {
      "command": "npx",
      "args": ["agentbase-mcp"]
    }
  }
}

Claude Code

claude mcp add agentbase npx agentbase-mcp

Continue (VS Code)

{
  "experimental": {
    "modelContextProtocolServers": [
      {
        "transport": {
          "type": "stdio",
          "command": "npx",
          "args": ["agentbase-mcp"]
        }
      }
    ]
  }
}

Any MCP Host

{
  "command": "npx",
  "args": ["agentbase-mcp"]
}

Usage Examples

Once connected, you can ask your AI agent:

• "Search AgentBase for safety filter instructions"

• "Find a customer support system prompt"

• "What categories of instruction files are available?"

• "Get the structured web research skill and show me just the instruction text"

• "Find featured orchestration patterns"

Direct API (no MCP)

The registry also has HTTP endpoints:

GET https://agentbase-registry.vercel.app/registry/index.json
GET https://agentbase-registry.vercel.app/registry/[slug].md
GET https://agentbase-registry.vercel.app/api/search?q=research&min_quality=85
GET https://agentbase-registry.vercel.app/llms.txt

Registry

• Website: https://agentbase-registry.vercel.app

• GitHub: https://github.com/AgentBase1/registry

• Submit a file: https://agentbase-registry.vercel.app/submit/

License

MIT — do whatever you want with the server code. Individual instruction files in the registry have their own licenses (most are CC0).