DCP-AI ↔ Google A2A Protocol Bridge

Bridges between DCP Agent Passports and Google A2A (Agent-to-Agent) Protocol Agent Cards, enabling DCP-certified agents to participate in Google A2A networks with post-quantum security.

Supported DCP Specifications

DCP-01 through DCP-09.

Overview

The Google A2A Protocol defines a standard for agent discovery and communication. This bridge maps DCP identity and audit concepts onto A2A primitives:

• Agent Passports ↔ Agent Cards — publish DCP-certified agents as discoverable A2A Agent Cards, and import A2A agents into the DCP ecosystem.
• A2A Tasks → DCP Intents — convert incoming A2A task requests into DCP Intents for policy evaluation and audit logging.
• Audit wrapping — attach DCP audit entries to A2A task executions for traceability.

Functions

| Function | Direction | Description | |---|---|---| | passportToAgentCard(passport, endpoint) | DCP → A2A | Convert an Agent Passport to an A2A Agent Card | | agentCardToPassport(card) | A2A → DCP | Convert an A2A Agent Card to an Agent Passport skeleton | | wrapA2ATaskWithAudit(task, agentId, intentId) | A2A + DCP | Wrap a task with a DCP audit entry | | a2aTaskToIntent(task, agentId) | A2A → DCP | Convert a task request into a DCP Intent | | addMandateToA2AHandshake(handshake, mandate) | DCP → A2A | Inject DCP-09 mandate into A2A handshake | | createLifecycleNotification(agentId, event, details) | DCP → A2A | Create A2A notification for lifecycle events (DCP-05) |

Agent Card Metadata

DCP metadata is embedded in the Agent Card's metadata field:

{
  "dcp_agent_id": "agent:uuid",
  "dcp_version": "2.0",
  "dcp_security_tier": "standard",
  "dcp_owner_rpr_hash": "sha256:...",
  "dcp_lifecycle_state": "active",
  "dcp_mandate_id": null
}

This allows A2A consumers to discover DCP-certified agents and verify their identity.

Usage

import { passportToAgentCard, a2aTaskToIntent } from './index.js';

// Publish a DCP agent as an A2A Agent Card
const card = passportToAgentCard(myPassport, 'https://my-agent.example.com/a2a');

// Convert an incoming A2A task to a DCP Intent
const intent = a2aTaskToIntent(incomingTask, 'agent:my-agent-id');

Notes

• Agent Card authentication.schemes is set to ['dcp-bundle'] to signal that this agent uses DCP bundle-based authentication.
• Passport skills are derived from DCP capabilities, with underscores replaced by spaces for human-readable names.
• Skeleton conversions (A2A → DCP) produce partial records that need key generation and signing before use.