@wasmagent/a2a

A2A (Agent2Agent) adapter — expose agents as A2A servers and call remote A2A agents.

Part of wasmagent — a TypeScript + WASM agent runtime.

▽ Maintenance-mode. This adapter is functional and security-patched, but is not receiving proactive feature work while the upstream A2A protocol stabilizes and demand signals (organic downloads, integration requests) come in. See maintenance tiers for the rationale. If you actively use this package and want it promoted to ◆ Narrative, open an issue tagged tier:promote-request with your use case.

Install

npm install @wasmagent/a2a @wasmagent/core

Usage

Expose an wasmagent agent as an A2A server

import { createA2AServer } from "@wasmagent/a2a";
import { ToolCallingAgent, AnthropicModel } from "@wasmagent/core";

const agent = new ToolCallingAgent({
  model: new AnthropicModel(/* ... */),
  tools: [/* ... */],
});

const server = createA2AServer(agent, {
  agentId: "https://example.com/agents/my-agent",
  name: "My Agent",
  description: "Does things over A2A.",
  skills: ["search.web", "calc.math"],
  port: 3000,
});

await server.start();
// → discoverable at http://localhost:3000/.well-known/agent-card
// → tasks accepted at http://localhost:3000/tasks

Call a remote A2A agent as a tool

import { A2ARemoteAgent } from "@wasmagent/a2a";
import { ToolCallingAgent } from "@wasmagent/core";

const remoteTool = A2ARemoteAgent.asTool({
  taskEndpoint: "https://other-team.example/tasks",
  name: "remote_search",
  description: "Web search via the team's hosted A2A agent.",
  apiKey: process.env.OTHER_TEAM_API_KEY,
});

const parent = new ToolCallingAgent({ model, tools: [remoteTool] });

Interoperability — proof on the wire

examples/a2a-interop runs both directions end-to-end inside one process:

• Path A — raw HTTP client hits createA2AServer. This is the path Google ADK / CrewAI 1.14+ / Langroid take when they discover and call our agent.
• Path B — A2ARemoteAgent.asTool calls a remote A2A endpoint. This is the path our agents take when calling out to an ADK / CrewAI agent.

node examples/a2a-interop/index.mjs

Aligns with the Agent2Agent v1.0 protocol so wasmagent agents interoperate with any A2A-compliant framework (Google ADK, CrewAI 1.14+, Langroid, …) without per-framework adapters.

License

Apache-2.0 — © wasmagent contributors