feat(a2a): integrate Agent2Agent (A2A) protocol for enhanced agent in… by zomux · Pull Request #211 · openagents-org/openagents

zomux · 2025-12-28T17:55:17Z

…teroperability

Introduced full support for the A2A protocol, enabling seamless communication between AI agents built on various frameworks (LangGraph, CrewAI, Pydantic AI, etc.).
Implemented A2A transport via HTTP at the /a2a endpoint, consolidating agent communication under a unified transport layer.
Added comprehensive documentation and examples to facilitate user adoption and understanding of A2A capabilities.
Enhanced agent registry and task management to support A2A-specific functionalities, including agent card discovery and task lifecycle management.
Updated network configuration templates to include A2A support across various demo setups.

…teroperability - Introduced full support for the A2A protocol, enabling seamless communication between AI agents built on various frameworks (LangGraph, CrewAI, Pydantic AI, etc.). - Implemented A2A transport via HTTP at the `/a2a` endpoint, consolidating agent communication under a unified transport layer. - Added comprehensive documentation and examples to facilitate user adoption and understanding of A2A capabilities. - Enhanced agent registry and task management to support A2A-specific functionalities, including agent card discovery and task lifecycle management. - Updated network configuration templates to include A2A support across various demo setups.

vercel · 2025-12-28T17:55:21Z

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Project	Deployment	Review	Updated (UTC)
openagents-studio	Ready	Preview, Comment	Dec 29, 2025 4:22am

Copilot

Pull request overview

This PR introduces comprehensive support for the A2A (Agent2Agent) protocol v0.3, enabling seamless communication between AI agents built on various frameworks. Key changes include:

Full A2A protocol implementation with HTTP/JSON-RPC transport at /a2a endpoint
Agent registry for managing remote A2A agents with health checks and card refresh
Task lifecycle management with in-memory store
Cross-protocol communication between gRPC, WebSocket, HTTP, and A2A agents
Comprehensive test coverage across all A2A components
Configuration templates updated for all demo networks

Reviewed changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated 34 comments.

Show a summary per file

File	Description
`tests/a2a/test_remote_agent_registry.py`	Tests for A2A agent registry including announcement, withdrawal, health checks, and card refresh
`tests/a2a/test_cross_protocol_communication.py`	Integration tests verifying communication between gRPC and A2A agents
`tests/a2a/test_a2a_transport.py`	Tests for A2A transport including JSON-RPC endpoints, authentication, and task management
`tests/a2a/test_a2a_task_store.py`	Tests for task store implementation with LRU eviction and callbacks
`tests/a2a/test_a2a_models.py`	Tests for A2A protocol data models (tasks, messages, agent cards)
`tests/a2a/test_a2a_converters.py`	Tests for event/message conversion utilities
`tests/a2a/test_a2a_connector.py`	Tests for A2A network connector for external A2A servers
`src/openagents/utils/a2a_converters.py`	Converters between OpenAgents events and A2A messages/tasks
`src/openagents/models/a2a.py`	Pydantic models for A2A protocol (tasks, messages, agent cards, JSON-RPC)
`src/openagents/models/transport.py`	Transport model updates with A2A support and remote agent status
`src/openagents/core/transports/http.py`	HTTP transport extended with A2A protocol at `/a2a` endpoint
`src/openagents/core/transports/a2a.py`	Standalone A2A transport implementation
`src/openagents/core/topology.py`	Topology integration with A2A registry and agent management
`src/openagents/core/connectors/a2a_connector.py`	Connector for OpenAgents agents to communicate with external A2A servers
`src/openagents/core/a2a_task_store.py`	Task store abstraction with in-memory implementation
Network YAML templates	Updated configurations with A2A transport enabled
`examples/cross_protocol_agents_example.py`	Example demonstrating gRPC-A2A cross-protocol communication

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Copilot · 2025-12-28T18:01:00Z

tests/a2a/test_cross_protocol_communication.py

+            topology.agent_registry["grpc-translator"] = grpc_connection
+
+            # Announce A2A agent via registry
+            a2a_connection = await a2a_registry.announce_agent(


Variable a2a_connection is not used.

Suggested change

a2a_connection = await a2a_registry.announce_agent(

await a2a_registry.announce_agent(

Copilot · 2025-12-28T18:01:00Z

src/openagents/core/transports/a2a.py

+    - events/send      - Send an event through the network
+"""
+
+import asyncio


Import of 'asyncio' is not used.

Suggested change

import asyncio

Copilot · 2025-12-28T18:01:00Z

src/openagents/core/transports/a2a.py

+from aiohttp import web
+
+from .base import Transport
+from openagents.models.transport import TransportType, AgentConnection, RemoteAgentStatus


Import of 'AgentConnection' is not used.
Import of 'RemoteAgentStatus' is not used.

Suggested change

from openagents.models.transport import TransportType, AgentConnection, RemoteAgentStatus

from openagents.models.transport import TransportType

Copilot · 2025-12-28T18:01:01Z

src/openagents/core/transports/a2a.py

+from openagents.models.a2a import (
+    AgentCard,
+    AgentSkill,
+    AgentCapabilities,
+    AgentProvider,
+    Task,
+    TaskState,
+    TaskStatus,
+    A2AMessage,
+    Artifact,
+    TextPart,
+    DataPart,
+    Role,
+    JSONRPCRequest,
+    JSONRPCResponse,
+    JSONRPCError,
+    A2AErrorCode,
+    parse_parts,
+    create_text_message,
+)


Import of 'Task' is not used.
Import of 'DataPart' is not used.
Import of 'JSONRPCResponse' is not used.
Import of 'JSONRPCError' is not used.

Copilot · 2025-12-28T18:01:01Z

src/openagents/core/connectors/a2a_connector.py

+    TaskStatus,
+    A2AMessage,
+    Artifact,
+    TextPart,
+    DataPart,
+    Role,
+    Part,
+    PushNotificationConfig,
+    parse_parts,


Import of 'DataPart' is not used.
Import of 'TaskStatus' is not used.
Import of 'Artifact' is not used.
Import of 'TextPart' is not used.
Import of 'Role' is not used.
Import of 'Part' is not used.
Import of 'parse_parts' is not used.

Suggested change

TaskStatus,

A2AMessage,

Artifact,

TextPart,

DataPart,

Role,

Part,

PushNotificationConfig,

parse_parts,

A2AMessage,

PushNotificationConfig,

Copilot · 2025-12-28T18:01:08Z

examples/cross_protocol_agents_example.py

+        }
+    )
+
+    network = AgentNetwork(config)


Call to AgentNetwork.init with too few arguments; should be no fewer than 2.

Suggested change

network = AgentNetwork(config)

network = AgentNetwork(config, asyncio.get_running_loop())

Copilot · 2025-12-28T18:01:08Z

src/openagents/core/connectors/a2a_connector.py

+                polling_task.cancel()
+                try:
+                    await polling_task
+                except asyncio.CancelledError:


'except' clause does nothing but pass and there is no explanatory comment.

Suggested change

except asyncio.CancelledError:

except asyncio.CancelledError:

# Expected when we cancel the polling task during disconnect; safe to ignore.

Copilot · 2025-12-28T18:01:08Z

src/openagents/core/connectors/a2a_connector.py

+            try:
+                await polling_task
+            except asyncio.CancelledError:
+                pass


'except' clause does nothing but pass and there is no explanatory comment.

Suggested change

pass

# Suppress cancellation error: this is expected when stopping background polling.

return

Copilot · 2025-12-28T18:01:08Z

src/openagents/core/a2a_registry.py

+            self._card_refresh_task.cancel()
+            try:
+                await self._card_refresh_task
+            except asyncio.CancelledError:


'except' clause does nothing but pass and there is no explanatory comment.

Copilot · 2025-12-28T18:01:09Z

src/openagents/core/a2a_registry.py

+            self._health_check_task.cancel()
+            try:
+                await self._health_check_task
+            except asyncio.CancelledError:


'except' clause does nothing but pass and there is no explanatory comment.

- Introduced a new job in the pytest workflow to run tests for the Agent2Agent (A2A) protocol. - Configured environment variables for the A2A tests to ensure proper execution and compatibility.

- Updated the GitHub Actions workflow to include pytest-aiohttp in the dependencies, enhancing the testing capabilities for asynchronous HTTP requests.

Copilot AI review requested due to automatic review settings December 28, 2025 17:55

Copilot started reviewing on behalf of zomux December 28, 2025 17:55 View session

vercel bot deployed to Preview December 28, 2025 17:56 View deployment

Copilot AI reviewed Dec 28, 2025

View reviewed changes

feat(tests): add A2A protocol tests to GitHub Actions workflow

acbb833

- Introduced a new job in the pytest workflow to run tests for the Agent2Agent (A2A) protocol. - Configured environment variables for the A2A tests to ensure proper execution and compatibility.

vercel bot deployed to Preview December 28, 2025 18:13 View deployment

fix(tests): add pytest-aiohttp to dependencies for improved testing

50302e2

- Updated the GitHub Actions workflow to include pytest-aiohttp in the dependencies, enhancing the testing capabilities for asynchronous HTTP requests.

vercel bot deployed to Preview December 28, 2025 18:20 View deployment

Fix connection guide translations

e465f93

vercel bot deployed to Preview December 29, 2025 04:22 View deployment

nebukaga merged commit e465f93 into develop Dec 29, 2025
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feat(a2a): integrate Agent2Agent (A2A) protocol for enhanced agent in…#211

feat(a2a): integrate Agent2Agent (A2A) protocol for enhanced agent in…#211
nebukaga merged 4 commits intodevelopfrom
feature/a2a_support_in_0.8

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	a2a_connection = await a2a_registry.announce_agent(
	await a2a_registry.announce_agent(

	from openagents.models.transport import TransportType, AgentConnection, RemoteAgentStatus
	from openagents.models.transport import TransportType

	network = AgentNetwork(config)
	network = AgentNetwork(config, asyncio.get_running_loop())

	except asyncio.CancelledError:
	except asyncio.CancelledError:
	# Expected when we cancel the polling task during disconnect; safe to ignore.

	pass
	# Suppress cancellation error: this is expected when stopping background polling.
	return

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