# NousResearch/hermes-agent · Langfuse tracing cost fixes and coverage expansion

## Open now

- Nothing open on GitHub.

These items address a bug where Langfuse traces reported zero total cost despite per-type breakdowns, a related fix for exporting canonical generation totals, and a feature widening Langfuse tracing to cover errors, sessions, subagents, and MoA fan-out scenarios.

## TL;DR

- 4 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 2 PR(s) closed without merging.
- A fix was merged to main in PR #85439. Verify it addresses your case.
- **Recommended:** read PR #85439 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `unresolved`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.50`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #72661: Bug: Langfuse traces show zero total_cost despite per-type cost breakdown

## Prior & competing PRs

- **#85439: feat(langfuse): widen tracing to errors, sessions, subagents, and MoA fan-out**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/conversation_loop.py`, `agent/moa_loop.py`, `agent/moa_trace.py`, `agent/redact.py`, `hermes_cli/config.py`, `hermes_cli/hooks.py`, `plugins/observability/langfuse/README.md`, `plugins/observability/langfuse/__init__.py`, `plugins/observability/langfuse/plugin.yaml`, `tests/agent/test_moa_observability_bridge.py`, `tests/plugins/test_langfuse_plugin.py`
- **#64797: fix(langfuse): export canonical generation total**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#85439`
- **#83437: feat(langfuse): widen tracing to errors, sessions, subagents, and MoA fan-out**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#85439`

## Fix status

- Merged to main in PR #85439 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-08-13`.
- Subsystem: `agent`