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fix(a2a): run follow-up task messages in their own request contextvars - #693
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a2a-sdk 1.x runs every message of a task in one producer task created by the first request, so follow-up messages saw the first request's contextvars, including BedrockAgentCoreContext and the workload access token. Snapshot contextvars per message in the request context builder and run the executor in that snapshot. Fixes #690
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What
contextvarsfor each A2A message.message/sendandmessage/streamfollow-up requests.How
The request-context builder captures a private
contextvarssnapshot for each message. The executor wrapper consumes that snapshot and starts the user executor within it, with a safe fallback when no snapshot is available.Why
a2a-sdk1.x processes later messages through the producer task created for the first request. Follow-up execution otherwise sees stale request values, including workload access tokens, request and session IDs, callback URLs, and forwarded headers.Fixes #690