mirror of https://github.com/NousResearch/hermes-agent.git synced 2026-06-19 10:02:16 +00:00

History

kshitijk4poor f4fbaa6cda fix(langfuse): bound _TRACE_STATE growth from non-finalizing turns Scoping the trace key by turn_id (the prior commit) fixed cross-turn collisions but introduced a slow leak: _finish_trace only pops a key when a turn ends cleanly (final response has content and no tool calls), so any turn that is interrupted, ends on a tool call, or has empty final content now leaves its uniquely-keyed entry in _TRACE_STATE forever. Previously the constant per-session key was overwritten by the next turn, capping growth at ~1 entry per session. Add an LRU cap (_MAX_TRACE_STATE) enforced by _evict_stale_locked, called under _STATE_LOCK immediately before each insert. It evicts the least-recently-updated entries (using the previously-dead last_updated_at field) and ends their root span so nothing dangles. Regression test drives 50 non-finalizing turns against a cap of 8 and asserts the dict stays bounded with the most-recent turns surviving.		2026-06-18 12:59:41 +05:30
..
__init__.py	fix(langfuse): bound _TRACE_STATE growth from non-finalizing turns	2026-06-18 12:59:41 +05:30
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