A skill for using Langfuse, a system for recording and evaluating how language-model applications behave. It supports observability, traces, prompts, datasets, scores, metrics, and related documentation.

Use it to instrument applications, inspect traces and sessions, manage prompts or datasets, debug model runs, and evaluate results.

It helps developers inspect model activity and evaluate outputs instead of debugging an AI application without recorded evidence.

langfuse — Skill for Claude Code by HybridAIOne

Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo

git clone --depth 1 https://github.com/HybridAIOne/hybridclaw

agentmods

npx agentmods add skills/hybridaione/hybridclaw/langfuse

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/hybridaione/hybridclaw/langfuse/github.svg)](https://agentmods.dev/skills/hybridaione/hybridclaw/langfuse)

Your own site

<a href="https://agentmods.dev/skills/hybridaione/hybridclaw/langfuse"><img src="https://agentmods.dev/badge/skills/hybridaione/hybridclaw/langfuse/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/hybridaione/hybridclaw/langfuse"><img src="https://agentmods.dev/badge/skills/hybridaione/hybridclaw/langfuse.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 111 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,106 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium MCP Rug Pull · line 100
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00111	$0.03106
Opus 5	$0.00056	$0.01553
Sonnet 5	$0.00022	$0.00621
Haiku 4.5	$0.00011	$0.00311

Measured 8d ago against content hash 0a983957b294, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

langfuse scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (langfuse.cjs), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

> `langfuse-cli` or `curl -H "Authorization: Basic $AUTH"`, use the helper

skills/langfuse/SKILL.md · 299 lines

How it starts

The opening of the file, as written. The whole thing — 299 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Langfuse

This skill helps you use Langfuse effectively across all common workflows: instrumenting applications, migrating prompts, debugging traces, accessing data, and evaluating outputs.

HybridClaw integration. This is the official Langfuse skill (github.com/langfuse/skills, MIT) adapted for HybridClaw. Two things differ from the upstream skill:

Credentials never leave the gateway. Do not export LANGFUSE_PUBLIC_KEY / LANGFUSE_SECRET_KEY, run npx langfuse-cli, or paste keys anywhere. Store them once in the runtime stores (below); the gateway injects them server-side.

Data access goes through langfuse.cjs, not the Langfuse CLI. The helper builds each REST request and sends it through the HybridClaw gateway, which resolves Authorization: Basic <secret:LANGFUSE_BASIC_AUTH> and the <env:LANGFUSE_HOST> base URL. Wherever a reference says to run langfuse-cli or curl -H "Authorization: Basic $AUTH", use the helper instead. Documentation retrieval (section 2) is unchanged.

HybridClaw setup

The helper never sees credentials. Store two values once. For secrets, use this order:

Browser admin: open the active HybridClaw admin URL ending in /admin/secrets.
Browser /chat or TUI fallback.
Local console fallback.
LANGFUSE_BASIC_AUTH — base64 of public-key:secret-key: /secret set LANGFUSE_BASIC_AUTH "<base64-public-colon-secret>"
LANGFUSE_HOST — your Langfuse base URL: /env set LANGFUSE_HOST https://cloud.langfuse.com (use https://us.cloud.langfuse.com for US, https://jp.cloud.langfuse.com for JP, or your self-hosted origin).

Local console fallback: hybridclaw secret set LANGFUSE_BASIC_AUTH "<...>" and hybridclaw env set LANGFUSE_HOST https://cloud.langfuse.com.

See references/operator-setup.md for key scope, host selection, autonomy defaults, and network-policy notes.

Read the full file on GitHub · 299 lines

Files

What ships with it

13 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

8d ago Changed · +2 lines 0a983957b294
12d ago First seen · 297 lines · 111 tokens per session scan A 8ee85577d295

Subscribe to this mod's changes

langfuse is a skill published in the GitHub repository HybridAIOne/hybridclaw (132 stars, last pushed yesterday), licensed MIT. It adds 111 tokens to every session and 3,106 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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