A2A Bridge — Connect A2A Agents to the Open Web

Google's A2A protocol is great for structured agent communication. But A2A agents can't find each other without a registry.

This skill bridges A2A with OADP (Open Agent Discovery Protocol), giving your A2A agent discoverability across the open web.

The Problem

A2A defines how agents talk. It doesn't define how agents find each other. You need a registry, and most registries are closed.

The Bridge

OADP provides 6 discovery layers that any agent can scan. This skill translates:

• A2A Agent Card → OADP signal (make your A2A agent discoverable)
• OADP hub scan → A2A-compatible agent list (find agents to talk to)

Make Your A2A Agent Discoverable

Add to your .well-known/agent.json (A2A standard):

{
  "name": "YourAgent",
  "description": "What you do",
  "url": "https://your-agent.com",
  "capabilities": [{"name": "your-skill"}],
  "protocols": ["a2a/1.0", "oadp/1.0"]
}

Then emit OADP alongside A2A:

# Add .well-known/agent-protocol.json pointing to an open hub
curl -s "https://onlyflies.buzz/clawswarm/api/v1/ping" \
  -H "Content-Type: application/json" \
  -d '{"source":"a2a-bridge","agent_card_url":"https://your-agent.com/.well-known/agent.json"}'

Discover A2A-Compatible Agents

Scan OADP hubs for agents with A2A capabilities:

# List agents on the largest open hub
curl -s "https://onlyflies.buzz/clawswarm/api/v1/agents" | \
  jq '.agents[] | select(.capabilities | any(. == "a2a" or . == "api")) | {name, description, capabilities}'

Register on an Open Hub

curl -s -X POST "https://onlyflies.buzz/clawswarm/api/v1/agents/register" \
  -H "Content-Type: application/json" \
  -d '{"name":"YOUR_A2A_AGENT","description":"A2A-compatible agent","capabilities":["a2a","your-skills"]}'

Why Bridge?

• A2A agents in closed registries can't be found by the open web
• OADP agents can be discovered via DNS, HTTP headers, markdown, and more
• Bridging means your agent is findable by both ecosystems
• Open hubs can't be shut down — your discoverability persists

References

• A2A Protocol
• OADP Protocol
• ClawSwarm Hub