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hermes-agent/plugins/observability/langfuse
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kamonspecial 9f1c16a7fb fix(langfuse): restore usage/cost when post_api_request sends a sanitized response 
on_post_llm_call extracted usage via `if response is not None:`, taking the
response-object path. But post_api_request delivers `response` as a sanitized
dict (no `.usage` attribute) alongside a separate `usage` summary dict, so
`getattr(response, "usage")` was always None and token/cost data was dropped
for every gateway turn (traces showed usage 0 / cost 0).

Gate on a real `.usage` attribute so the existing usage-dict fallback is
reached. Real response objects (post_llm_call / legacy) still take the
response-object path. Adds regression tests for both paths.
2026-06-07 00:06:39 +09:00
..
__init__.py fix(langfuse): restore usage/cost when post_api_request sends a sanitized response 2026-06-07 00:06:39 +09:00
plugin.yaml Add Hermes desktop app (#20059) 2026-05-31 17:46:56 -05:00
README.md Add Hermes desktop app (#20059) 2026-05-31 17:46:56 -05:00

README.md

Langfuse Observability Plugin

This plugin ships bundled with Hermes but is opt-in — it only loads when you explicitly enable it.

Enable

Pick one:

# Interactive: walks you through credentials + SDK install + enable
hermes tools  # → Langfuse Observability

# Manual
pip install langfuse
hermes plugins enable observability/langfuse

Required credentials

Set these in ~/.hermes/.env (or via hermes tools):

HERMES_LANGFUSE_PUBLIC_KEY=pk-lf-...
HERMES_LANGFUSE_SECRET_KEY=sk-lf-...
HERMES_LANGFUSE_BASE_URL=https://cloud.langfuse.com   # or your self-hosted URL

Without the SDK or credentials the hooks no-op silently — the plugin fails open.

Verify

hermes plugins list                 # observability/langfuse should show "enabled"
hermes chat -q "hello"              # then check Langfuse for a "Hermes turn" trace

Optional tuning

HERMES_LANGFUSE_ENV=production       # environment tag
HERMES_LANGFUSE_RELEASE=v1.0.0       # release tag
HERMES_LANGFUSE_SAMPLE_RATE=0.5      # sample 50% of traces
HERMES_LANGFUSE_MAX_CHARS=12000      # max chars per field (default: 12000)
HERMES_LANGFUSE_DEBUG=true           # verbose plugin logging

Disable

hermes plugins disable observability/langfuse