hermes-agent/plugins/observability/langfuse
alt-glitch 2bd9c9b881 opentui(phase3): launcher integration — HERMES_TUI_ENGINE dual-engine
hermes --tui launches the native OpenTUI engine (Bun) when
HERMES_TUI_ENGINE=opentui (env) or display.tui_engine=opentui (config);
Ink stays the default and the shipping path is untouched.

- _resolve_tui_engine() (env > config > ink); refuses opentui on
  Windows/Termux (no Bun) -> falls back to ink with a notice.
- _make_opentui_argv() -> [bun, src/entry.real.tsx] (no build step).
- _bun_bin() with HERMES_BUN override.
- Branch at top of _make_tui_argv BEFORE _ensure_tui_node (Bun-only host
  must not bootstrap Node).
- Gate _launch_tui NODE_OPTIONS/--max-old-space-size on engine==ink (Bun
  is JSC; the V8 flag errors/ignores).

Verified end-to-end via tmux: real hermes --tui -> Bun -> OpenTUI ->
real Python gateway streamed a real reply. No-flag default still ink.
2026-06-08 11:11:54 +00:00
..
__init__.py opentui(phase3): launcher integration — HERMES_TUI_ENGINE dual-engine 2026-06-08 11:11:54 +00:00
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

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