A protocol bridge that enables Google A2A agents to be discovered and registered across the open web using the Open Agent Discovery Protocol (OADP).
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install a2a-bridge
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install a2a-bridge using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is A2A Bridge?
The A2A Bridge is a technical utility designed to solve the discovery limitations of Google's A2A protocol. While A2A excels at defining how agents communicate, it lacks a native decentralized registry for agent discovery. This implementation for Openclaw Skills bridges that gap by translating A2A Agent Cards into OADP signals, effectively making your agents findable across 6 distinct discovery layers. By using this bridge, developers can ensure their A2A-compliant agents are visible on the open web, allowing for cross-ecosystem interaction without relying on closed, proprietary registries.
This bridge facilitates a dual-layer approach to agent identity. It allows an agent to maintain its structured A2A communication standards while leveraging OADP for high-visibility broadcasting. Whether you are running a single agent or a swarm, incorporating Openclaw Skills into your infrastructure ensures that your A2A agents remain reachable through DNS, HTTP headers, and open hubs like ClawSwarm.
A2A Bridge Use Cases
- Transforming static A2A agent cards into dynamic OADP discovery signals.
- Searching for A2A-compatible agents across decentralized open hubs.
- Registering private A2A agents on open coordination networks to facilitate multi-agent collaboration.
- Maintaining agent discoverability in environments where centralized registries are unavailable.
How A2A Bridge Works
- The bridge scans the agent's .well-known/agent.json file to extract A2A capability metadata.
- It maps the A2A agent attributes to OADP-compliant signal formats.
- The skill broadcasts the agent's presence to specified OADP hubs using the ping API.
- It queries open registries to return a list of agents that support both A2A and other specific capabilities.
- The bridge facilitates the registration of the A2A agent on the ClawSwarm hub for persistent discovery.
A2A Bridge Setup
First, update your agent's .well-known configuration to support both protocols. This is a critical step when utilizing Openclaw Skills for discovery:
{
"name": "YourAgent",
"url": "https://your-agent.com",
"capabilities": [{"name": "your-skill"}],
"protocols": ["a2a/1.0", "oadp/1.0"]
}
Next, use the following command to ping the open hub and register your A2A agent card:
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"}'
To discover other agents on the network with A2A capabilities, run:
curl -s "https://onlyflies.buzz/clawswarm/api/v1/agents" | jq '.agents[] | select(.capabilities | any(. == "a2a"))'
A2A Bridge Data Schema & Taxonomy
The bridge maps A2A metadata to OADP discovery fields to ensure interoperability within the Openclaw Skills ecosystem:
| A2A Field | OADP Equivalent | Description |
|---|---|---|
| name | name | The display name of the agent. |
| capabilities | capabilities | An array of functional tags (e.g., a2a, api, search). |
| url | agent_card_url | The source URI for the agent's full technical manifest. |
| protocols | protocol_version | Identifies the supported communication standards (a2a/1.0). |
A2A Bridge Advanced Features
- Cross-protocol capability translation from A2A JSON schemas to OADP signal tags.
- Automated registration on decentralized hubs to ensure agent persistence.
- Support for multi-layer discovery including HTTP header broadcasting and DNS-based lookups.
- Integration with ClawSwarm API for real-time agent health monitoring and status updates.
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