Files
hermes-agent/plugins/observability/langfuse/plugin.yaml
kshitij e665300d6b feat(langfuse): widen tracing to errors, sessions, subagents, and MoA fan-out
Salvaged from PR #83437 by @erosika, with adopted fixes from @bgodlin (#81054),
@aldoeliacim (#82332), @nftpoetrist (#42326), @rodboev (#39653), @FnExpress
(#64292, supersedes #32175 by @db-aeon), @Per0-1 (#61166), @NaMinhyeok (#64797),
and @liuhao1024 (#43130).

Widens the bundled Langfuse plugin from 6 to 11 hooks and fixes two
attribution bugs. Also adopts shutdown/atexit lifecycle fixes and composes
8 prior community PRs with interaction-fix follow-ups.

Model attribution: on_pre_llm_request and on_post_llm_call now prefer the
wire value (request body model, response model) over the agent attribute,
which goes stale after /model switch or provider fallback.

Cost total: both cost paths now send a summed total alongside the per-type
breakdown, since Langfuse does not derive calculatedTotalCost from
cost_details keys. Subscription-included routes send no cost keys at all.

New coverage: api_request_error closes failed generations with ERROR level;
on_session_finalize/on_session_end close dangling traces for tool-only and
interrupted turns; subagent_start/subagent_stop trace delegated children as
spans; MoA advisor fan-out emits one generation per advisor priced at the
advisor's own model.

Capture modes: HERMES_LANGFUSE_CAPTURE=metadata|sanitized|full (default
sanitized). Sanitized mode redacts secret patterns before truncation.

Adopted lifecycle fixes: shutdown client at session finalize when
reason=shutdown (not on session rotation); atexit finalizer ends open root
spans for short-lived processes; root context manager exited to prevent
interpreter-teardown TypeError; TOCTOU on _get_langfuse() fixed with lock;
reasoning_content surfaced in traces; system prompt included in generation
input for Anthropic/Codex/Bedrock; SDK v3 update_trace replaces set_trace_io.

Closes #29482, #43129, #72661.
Supersedes #81054, #82332, #42326, #39653, #64292, #32175, #61166, #64797, #43130.
Partially addresses #67544 (capture modes + secret redaction; user_id remains open).
2026-08-13 23:10:16 +05:30

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YAML

name: langfuse
version: "1.0.0"
description: "Optional Langfuse observability for Hermes — traces conversations, LLM calls, and tool usage. Opt-in via `hermes plugins enable observability/langfuse` or `hermes tools → Langfuse Observability`."
author: NousResearch
requires_env:
- HERMES_LANGFUSE_PUBLIC_KEY
- HERMES_LANGFUSE_SECRET_KEY
hooks:
- pre_api_request
- post_api_request
- api_request_error
- pre_llm_call
- post_llm_call
- pre_tool_call
- post_tool_call
- on_session_finalize
- on_session_end
- subagent_start
- subagent_stop