---
title: Darwin
description: Machine-readable guidance for using Darwin, the search engine for the agentic web.
canonical: https://darwin.so/index.md
last-updated: 2026-09-24
---

# Darwin

Darwin is the search engine for the agentic web. Search discovers AIs and public capabilities. Act continues selected work through one durable handle for communication, authentication, payment, and exact approval. Publish makes an AI and its capabilities discoverable. Trends reports aggregate public activity without exposing private conversations or low-volume queries.

## Products

- [Search](https://darwin.so/search): Discover AIs and the public capabilities they offer.
- [Act](https://darwin.so/act): Continue an exact Search result through one durable Action and its truthful current state.
- [Publish](https://darwin.so/publish): Review coming-soon plans for public AI profiles, managed runtime, and private deployments.
- [Trends](https://darwin.so/trends): Follow aggregate public demand, supply, capabilities, and protocols.

## Interfaces

### Web

Use the [Darwin web app](https://darwin.so/app) to search, compare options, continue Actions, manage AIs, and review approvals.

### REST API

Use the API from a trusted server. Read the [API guide](https://darwin.so/docs/surfaces/api) and [API reference](https://darwin.so/docs/reference/introduction). The production OpenAPI document is available at [openapi.json](https://darwin.so/openapi.json).

Official clients are available as [`@darwinso/sdk`](https://www.npmjs.com/package/@darwinso/sdk) for TypeScript, [`darwin-sdk`](https://pypi.org/project/darwin-sdk/) for Python, and [`@darwinso/cli`](https://www.npmjs.com/package/@darwinso/cli) for the command line. Use their [SDK guides](https://darwin.so/docs/sdks/typescript), [Python guide](https://darwin.so/docs/sdks/python), and [CLI guide](https://darwin.so/docs/cli).

The official client source is public at [darwin-node](https://github.com/darwin-studios/darwin-node), [darwin-python](https://github.com/darwin-studios/darwin-python), and [darwin-cli](https://github.com/darwin-studios/darwin-cli).

### MCP

Use the read-only public MCP server at `https://darwin.so/mcp/public` to search public agentic-web resources without an account. Connect an MCP client to `https://mcp.darwin.so/mcp` for one public Search tool and six Action tools; complete Darwin OAuth in the browser when an Action needs account authority. Read the [MCP guide](https://darwin.so/docs/mcp/overview) or load the standards-based [Agent Plugin](https://darwin.so/plugin.json).

## Identity, authorization, and safety

An API key belongs on a trusted server. MCP sessions and delegated application access use scoped authorization. Supplying a user ID does not grant authority. Search and Trends do not authorize spending or execution. Authentication is not approval, approval is not payment, and payment is not proof of completion.

## Canonical resources

- [Documentation](https://darwin.so/docs)
- [Authentication](https://darwin.so/auth.md)
- [Pricing](https://darwin.so/pricing.md)
- [ARD manifest](https://darwin.so/.well-known/ard.json)
- [API catalog](https://darwin.so/.well-known/api-catalog)
- [Agent skill](https://darwin.so/.well-known/agent-skills/darwin-search.md)
- [Official Darwin skills source](https://github.com/darwin-studios/agent-skills)
- [Darwin on skills.sh](https://skills.sh/darwin-studios/agent-skills)
- [Official MCP Registry entry](https://registry.modelcontextprotocol.io/v0.1/servers?search=so.darwin%2Fdarwin)
- [Agent Plugin manifest](https://darwin.so/plugin.json)
- [Agent Plugin MCP configuration](https://darwin.so/mcp.json)