Eduard van Valkenburg
5534198142
* feat(python): add agent-framework-hosting-a2a channel Add a hosting channel that exposes the host target (agent or workflow) as a peer agent over the Agent-to-Agent (A2A) protocol (JSON-RPC plus a served agent card). Requests are handled by a host-routed HostAgentExecutor that drives the host pipeline (ChannelContext.run/ run_stream) instead of wrapping the target directly, so sessions, linking, and run/response hooks apply. Maps the A2A conversation/context id to a ChannelSession isolation key and the caller to a ChannelIdentity; streaming emits incremental task artifacts. Includes tests, README, and workspace registration. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Address A2A hosting channel review feedback Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
agent-framework-hosting-a2a
Agent-to-Agent (A2A) protocol channel for agent-framework-hosting.
Exposes the hosted target (an Agent or a Workflow) as an A2A peer agent: it
publishes an agent card and JSON-RPC routes and drives every request through the
host pipeline, so host sessions, request metadata, and run/response hooks all
apply.
from agent_framework.openai import OpenAIChatClient
from agent_framework_hosting import AgentFrameworkHost
from agent_framework_hosting_a2a import A2AChannel
agent = OpenAIChatClient().as_agent(name="Assistant")
host = AgentFrameworkHost(
target=agent,
channels=[A2AChannel(url="https://my-host.example.com/")],
)
host.serve(port=8000)
By default the channel mounts at the app root so the well-known agent card is
reachable at /.well-known/agent-card.json, with the JSON-RPC endpoint at /.
The A2A context_id maps onto the host session (caller-supplied session family).
A default agent card is derived from the target's name and description; pass a
fully-specified agent_card to override it. To advertise additional protocol
bindings in the generated card, pass supported_interfaces.
Note: Task state is held in an in-memory A2A task store for this version; it is independent of the host's session storage and is not persisted across restarts.
The base host plumbing lives in
agent-framework-hosting.