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v3.4.4

Released 2026-07-12.

A capability release that adds the experimental MCP Tasks protocol surface to the Bernstein MCP server, plus release-pipeline hardening.

MCP Tasks extension

  • Long-running runs are now exposed through the experimental MCP Tasks protocol. A task-capable MCP client (Claude Code, Cursor, Cline, and others) can start a run with bernstein_run, receive a CreateTaskResult, and then poll status and retrieve the result asynchronously through the get_task, get_task_result, list_tasks, and cancel_task handlers without holding a blocking session open. The task handle embeds the run's audit-chain head hash ({task_id}:{head_hash}) so a stateless client can still tie a progress claim back to the signed chain.
  • W3C trace-context (traceparent, tracestate, baggage) is ingested from the incoming request and propagated to the spawned agent, scoped per task so a run without trace-context never inherits another run's context.
  • Every task status projects to a terminal MCP status on completion, and get_task_result reports an error for terminal-error and in-flight tasks instead of reporting success.

Thanks to @Amanmeena0 for contributing the MCP Tasks protocol implementation and the trace-context propagation.

Release pipeline

  • The MCP registry listing publish is now idempotent: a version that is already live is treated as success instead of failing the release on a re-run or a tag-push/dispatch race. (#2466)

Housekeeping

  • Refreshed the packaged adapter last-green projection and its docs table from the nightly conformance canary; every row stays anchored to its attesting receipt.