Nov 6, 2026
v1.0.4 skips patterns; v2.14.0 limits evaluation.
Nov 4, 2026
Live model spans precede the enclosing workflow tree.
Nov 4, 2026
CLI migration depends on how sessions start.
Run admission and tool retries protect different identities.
Admission
Vercel’s November 4 release adds atomic run admission with a hook token in Workflow 5.4.0. A duplicate start is rejected before it becomes another run, closing the gap between a separate lookup and start. That does not permanently reserve an agent‑session key.
Ownership
The contract releases a key at run end unless retention remains; a retention duration starts at admission. Explicit hook disposal, including an inner using scope ending, releases it earlier—even during execution—and defeats post‑run retention. Use const and keep the hook open through the work it must exclude.
Tool effects
Workflow’s durable‑agent guide makes tools retryable. The step contract keeps an invocation’s stepId stable across retries, but unique per step.
For an early‑released chat key, a second run’s equivalent tool action is another invocation with another step key. Retry stability therefore does not deduplicate that business action across runs. Define which operation must be unique and check the receiving API’s matching‑key contract. This is design analysis, not an execution test.
Atomic starts require compatible backend support; Postgres needs migration 0028_add_start_hook_admissions and older workers stopped.
Original graphic: OpenTools Team; lifecycle facts from the linked SDK documentation.