langfuse / langfuse/codex-observability-plugin
Subagent traces replay inherited ancestor turns
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@milanagm is already working on this.
Since Sep 17, 2026.
bug
feat-agents
feat-llm-cost-tracking
feat-tracing
- Dominant language
- TypeScript
- Stars
- 30
- Forks
- 31
- Avg merge
- 3d 6h
- Merged PRs (30d)
- 13
Description
With Codex 0.153.0, subagent rollouts can contain turns inherited from their parent and earlier ancestors. The plugin exports those turns again as descendant work, duplicating observations and inflating token usage and cost.
In this affected trace:
- The main turn appeared three times and the child turn twice.
- An earlier completed turn was replayed inside both descendants.
- Two inherited generations added 36,814 tokens and $0.0343.
Expected: Each subagent exports only its own turns, skipping inherited ancestor turns.
Proposed fix: PR #81 tracks ancestor turn IDs during recursive conversion and skips inherited copies. It includes a regression test and a corrected replay of the affected trace.
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