# Agent Identity & Discovery (AID)

> AID is a DNS-based discovery protocol for the agentic web, created by the .agent Community (Open Agent Registry, Inc.). Given a domain, query `_agent.<domain>` TXT record to find its agent endpoint. AID supports MCP, A2A, OpenAPI, and custom protocols. The community has over 3,000 members including 700+ companies and 2,300+ developers.

## Links

- [AID Homepage](https://aid.agentcommunity.org): Landing page, interactive workbench
- [AID Specification](https://aid.agentcommunity.org/docs/specification): Full protocol specification (v1.1)
- [Quick Start](https://aid.agentcommunity.org/docs/quickstart): Getting started with AID
- [TypeScript SDK](https://aid.agentcommunity.org/docs/quickstart/quickstart_ts): Node.js / TypeScript integration
- [Python SDK](https://aid.agentcommunity.org/docs/quickstart/quickstart_python): Python integration
- [Go SDK](https://aid.agentcommunity.org/docs/quickstart/quickstart_go): Go integration
- [Rust SDK](https://aid.agentcommunity.org/docs/quickstart/quickstart_rust): Rust integration
- [Java SDK](https://aid.agentcommunity.org/docs/quickstart/quickstart_java): Java integration
- [.NET SDK](https://aid.agentcommunity.org/docs/quickstart/quickstart_dotnet): .NET integration
- [Browser SDK](https://aid.agentcommunity.org/docs/quickstart/quickstart_browser): Browser integration
- [MCP Integration](https://aid.agentcommunity.org/docs/quickstart/quickstart_mcp): Model Context Protocol
- [A2A Integration](https://aid.agentcommunity.org/docs/quickstart/quickstart_a2a): Agent-to-Agent Protocol
- [OpenAPI Integration](https://aid.agentcommunity.org/docs/quickstart/quickstart_openapi): OpenAPI tools
- [Design Rationale](https://aid.agentcommunity.org/docs/Understand/rationale): Why AID uses DNS
- [Security](https://aid.agentcommunity.org/docs/Reference/security): Security considerations
- [Discovery API](https://aid.agentcommunity.org/docs/Reference/discovery_api): API reference
- [Protocols](https://aid.agentcommunity.org/docs/Reference/protocols): Supported protocols
- [Identity & PKA](https://aid.agentcommunity.org/docs/Reference/identity_pka): Public key attestation
- [Well-Known JSON](https://aid.agentcommunity.org/docs/Reference/well_known_json): .well-known fallback
- [Troubleshooting](https://aid.agentcommunity.org/docs/Reference/troubleshooting): Common issues
- [aid-doctor CLI](https://aid.agentcommunity.org/docs/Tooling/aid_doctor): CLI diagnostic tool
- [Workbench](https://aid.agentcommunity.org/workbench): Interactive resolver and generator tool
- [GitHub](https://github.com/agentcommunity/agent-identity-discovery): Source code and issues

## Related Sites

- [.agent Community](https://agentcommunity.org): Main site, pre-register a .agent domain
- [Community Docs](https://docs.agentcommunity.org): Governance, guides, and key concepts
- [AgentBrief Blog](https://agentcommunity.org/blog): Daily news and updates

## Key Concepts

- **AID record**: A DNS TXT record at `_agent.<domain>` that advertises an agent's endpoint, supported protocols, and optional public key fingerprint.
- **Agentic web**: The emerging internet layer where autonomous AI agents discover, authenticate, and interact with each other.
- **.agent TLD**: A proposed top-level domain dedicated to AI agents, pending ICANN approval. The community application window opens late April 2026.
- **MCP (Model Context Protocol)**: Protocol for connecting AI models to tools and data sources. AID can advertise MCP endpoints.
- **A2A (Agent-to-Agent)**: Google's protocol for agent interoperability. AID can advertise A2A endpoints.
- **PKA (Public Key Attestation)**: Optional cryptographic identity verification in AID records, enabling agent authentication without a central authority.

## Raw Markdown API

Each documentation page is available as raw markdown at `/api/docs/{slug}`.
Example: `https://aid.agentcommunity.org/api/docs/specification`
Add `?format=json` for structured JSON with title, description, content, and headings.