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hermes-agent/plugins/observability/langfuse
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kshitijk4poor e1d10ec1ed refactor(langfuse): extract _scope_prefix from _trace_key 
The turn- and api-scoped branches each repeated the same
task/session/thread fallback ladder with only the infix differing. Extract
the shared prefix into _scope_prefix so a future scope dimension touches one
ladder instead of three. The legacy branch still returns a bare task_id (not
the task: prefix) for backward compatibility, so it stays separate.

Output key strings are unchanged; a new test pins them across every
task/session/turn/api combination since the keys are matched across hooks
and any drift would silently break trace finalization.
2026-06-18 12:58:24 +05:30
..
__init__.py refactor(langfuse): extract _scope_prefix from _trace_key 2026-06-18 12:58:24 +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