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Langfuse Observability Plugin
This plugin ships bundled with Hermes but is opt-in — it only loads when you explicitly enable it.
Enable
pip install langfuse
hermes plugins enable observability/langfuse
Or check the box in the interactive hermes plugins UI.
Required credentials
Set these in ~/.hermes/.env:
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