Hermes-agent

plugins/observability/langfuse/README.md

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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
+
+Pick one:
+
+```bash
+# 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`):
+
+```bash
+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
+
+```bash
+hermes plugins list                 # observability/langfuse should show "enabled"
+hermes chat -q "hello"              # then check Langfuse for a "Hermes turn" trace
+```
+
+## Optional tuning
+
+```bash
+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
+
+```bash
+hermes plugins disable observability/langfuse
+```

plugins/observability/langfuse/plugin.yaml

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+name: langfuse
+version: "1.0.0"
+description: "Optional Langfuse observability for Hermes — traces conversations, LLM calls, and tool usage. Opt-in via `hermes plugins enable observability/langfuse` or `hermes tools → Langfuse Observability`."
+author: NousResearch
+requires_env:
+  - HERMES_LANGFUSE_PUBLIC_KEY
+  - HERMES_LANGFUSE_SECRET_KEY
+hooks:
+  - pre_api_request
+  - post_api_request
+  - pre_llm_call
+  - post_llm_call
+  - pre_tool_call
+  - post_tool_call