send_message took the responder identity from a client-supplied
metadata.from_agent, so any caller could spoof anyone (e.g.
from_agent='ceo') in the task's notes and in the spawn/notification
routed back to the original requester. Stamp the authenticated caller's
slug as the responder instead (CurrentAgentContext).
cancel_task was ungated: no auth dependency and no role check, so any
agent (or any caller) could cancel a task the lifecycle rule reserves to
PM roles (Any -> cancelled: PM roles only) — and the cascade-cancel of
all non-terminal descendants ran with a hardcoded cell_pm role and no
recorded actor. Add require_any_authenticated_agent + a PM-or-above gate,
and thread the authenticated role (into the cascade role gate) and slug
(into the cancellation note) into A2AService.cancel_task.
Tests: send_message ignores a spoofed from_agent and records the
authenticated slug; cancel rejects a developer (403) and a missing auth
header; a PM cancel threads role + slug into the service; the pre-existing
cancel success/already-terminal/not-found tests now run under a PM context
(the success test's body was missing the A2A 'name' field and false-passed
on a 422 — now genuine).
Renn F
5bec3ec565