agent-identity-bridge

One identity. Every protocol. Full audit trail.

AIB is an open-source protocol and reference implementation that gives AI agents a single portable identity across MCP (Anthropic), A2A (Google), ANP (W3C DID), and AG-UI — the four layers of the 2026 AI communication stack.

Each AI protocol has its own identity system. An agent operating across MCP + A2A + ANP has three separate identities with no link between them. This makes cross-protocol auditing impossible, credential management painful, and compliance (GDPR, SOC2) a nightmare.

| Component | Purpose | |-----------|---------| | Agent Passport | A signed JSON document (JWS) that binds one agent identity to credentials for every protocol it supports | | Credential Translator | Converts between A2A Agent Cards ↔ MCP Server Cards ↔ DID Documents automatically | | Audit Trail | Unified OpenTelemetry traces for every cross-protocol interaction | | Gateway Proxy | Reverse proxy that injects the right credentials based on target protocol |

# Clone and install
git clone https://github.com/tntech-consulting/agent-identity-bridge.git
cd agent-identity-bridge
pip install -e .

# Create your first Agent Passport
python -m aib.passport

# Translate between protocol formats
python -m aib.translator

{
  "aib_version": "0.1",
  "passport_id": "urn:aib:agent:myorg:my-agent",
  "display_name": "My Agent",
  "issuer": "urn:aib:org:myorg",
  "capabilities": ["search", "booking"],
  "protocol_bindings": {
    "mcp": { "server_card_url": "https://...", "auth_method": "oauth2" },
    "a2a": { "agent_card_url": "https://...", "auth_method": "bearer" },
    "anp": { "did": "did:web:example.com:agents:my-agent", "auth_method": "did-auth" }
  }
}

┌─────────────┐     ┌─────────────────┐     ┌──────────────┐
│  Your Agent  │────▶│   AIB Gateway    │────▶│  MCP Server