paso

The agent-readiness toolkit for APIs.

Declare your API's capabilities once. paso generates the MCP server. No protocol code required.

Self-hosted. Open source. Apache 2.0.

Install

pip install usepaso

Quick Start

# Scaffold a declaration
usepaso init --name "MyService"

# Or generate from an existing OpenAPI spec
usepaso init --from-openapi ./openapi.json

# Check it
usepaso validate

# Preview what MCP tools will be generated
usepaso inspect

# Test a capability (without the consequences)
usepaso test list_issues -p org=acme -p project=web --dry-run

# Start the MCP server
usepaso serve

That's it. Your API is agent-ready.

What You Write

# usepaso.yaml
version: "1.0"

service:
  name: MyService
  description: My API service
  base_url: https://api.example.com
  auth:
    type: bearer

capabilities:
  - name: list_items
    description: List all items
    method: GET
    path: /items
    permission: read

  - name: create_item
    description: Create a new item
    method: POST
    path: /items
    permission: write
    consent_required: true
    inputs:
      name:
        type: string
        required: true
        description: Item name

What paso Does With It

Each capability becomes an MCP tool. When an agent calls it, paso makes the HTTP request to your API with proper auth, parameters, and error handling.

CLI

Programmatic Usage

from usepaso import parse_file, validate

decl = parse_file('usepaso.yaml')
errors = validate(decl)

Connect to MCP Clients

usepaso connect claude-desktop
usepaso connect cursor
usepaso connect vscode
usepaso connect windsurf

Or add manually to your client config:

{
  "mcpServers": {
    "my-service": {
      "command": "usepaso",
      "args": ["serve", "-f", "/path/to/usepaso.yaml"],
      "env": { "USEPASO_AUTH_TOKEN": "your-token" }
    }
  }
}

Links

• Documentation
• Blog
• Changelog
• Spec reference
• Examples
• Node.js SDK

License

Apache 2.0