fix(workflow): scope dynamic node cache rehydration to current invocation#1010
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…tion rehydrateCache scanned the entire session history and cached child outputs keyed by childPath, without filtering by invocation_id. Because auto-counter run-ids reset to 1 on every fresh activation, a later user turn reuses the same childPath (e.g. "wf/child@1") as a prior turn, so the stale output was served from cache and the child never re-ran. This caused the dynamic workflow example to return empty output on the second and subsequent turns. Filter rehydration to events from the current invocation, mirroring adk-python (_reconstruct_node_states / _scan_parent_child_sequence gate on event.invocation_id). Within-invocation resume/dedup is preserved.
hanorik
approved these changes
Jun 16, 2026
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Problem
A dynamic workflow (e.g.
examples/workflow/dynamic/basic) returns emptyoutput on the second and every subsequent turn of the same session. The first
turn works; later turns print nothing.
Root cause:
dynamicSubScheduler.rehydrateCachescans the entire sessionhistory and caches child outputs keyed by
childPath, without filtering byinvocation. Auto-counter run-ids reset to
1on every fresh activation, so alater user turn reuses the same
childPath(e.g.wf/child@1) as a priorturn. The stale output is served from cache, the child never re-runs, and the
parent's terminal event carries an
Outputbut noContent— so the console(which prints content text) shows nothing.
Solution
Filter rehydration to events from the current invocation. Stale events from
earlier turns are skipped, so a fresh turn re-runs its children; events from the
current invocation still hit, preserving within-invocation resume/dedup (the
HITL replay path).
This mirrors adk-python, which gates rehydration on
event.invocation_id(
_reconstruct_node_states/_scan_parent_child_sequence).