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Langfuse-dotnet: Instructions file for Claude Code

CLAUDE.md

Langfuse-dotnet CLAUDE.md is an instructions file for Claude Code from lukaszzborek/Langfuse-dotnet. It costs 1,015 tokens per session, scanned A, original, MIT.

Project instructions for a .NET client library that communicates with the Langfuse API, including services for datasets, comments, annotations, and other API areas. They document commands for building, testing, running examples, restoring packages, and creating a NuGet package.

In plain words
What is it for?
Use them to build or test the solution, run console or web examples, restore dependencies, package the library, and understand its main client and service components.
Why use it?
They provide the repository's standard commands and explain important client behavior, such as splitting large batches before sending them.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is lukaszzborek/Langfuse-dotnet's own configuration. It tells Claude Code how to work on Langfuse-dotnet itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything Langfuse-dotnet configures →

not rated 25repo changed 18d ago A scan 1,015 tokens original MIT
View source ↗ lukaszzborek/Langfuse-dotnet
Reuse

Borrowing it

Nothing to install: this file belongs to lukaszzborek/Langfuse-dotnet. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/lukaszzborek/Langfuse-dotnet/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/lukaszzborek/Langfuse-dotnet

Made for: Claude Code.

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Per session 1,015 This file is loaded in full into every session.
When invoked 1,015 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01015 $0.01015
Opus 5.5 $0.00406 $0.00406
Sonnet 5.5 $0.00203 $0.00203
Haiku 4.5 $0.00102 $0.00102

Measured 18d ago against content hash ea4bf7b59b4f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Langfuse-dotnet CLAUDE.md scanned grade A with 0 findings 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 18d ago.

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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 112 lines

How it starts

The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Development Commands

Building and Testing

  • dotnet build - Build the entire solution
  • dotnet test - Run all tests in the solution
  • dotnet build src/Langfuse/Langfuse.csproj - Build the main library project
  • dotnet test tests/Langfuse.Tests/Langfuse.Tests.csproj - Run unit tests specifically

Running Examples

  • dotnet run --project Examples/Langfuse.Example.Console - Run console example
  • dotnet run --project Examples/Langfuse.Example.OpenTelemetry - Run OpenTelemetry tracing example (available at localhost)

Package Management

  • dotnet pack src/Langfuse/Langfuse.csproj - Create NuGet package
  • dotnet restore - Restore NuGet dependencies

Project Architecture

The library targets the Langfuse v4 API. Traces are sent only through OpenTelemetry; the legacy v3 ingestion and read endpoints (traces, sessions, v1 observations/metrics, v2 scores, dataset runs) are not supported.

Core Components

LangfuseClient (src/Langfuse/Client/)

  • Main HTTP client for Langfuse API communication
  • Implements partial classes pattern for different API sections (AnnotationQueue, Comment, Dataset, etc.)

OtelLangfuseTrace (src/Langfuse/OpenTelemetry/Trace/)

  • Tracing built on System.Diagnostics.Activity with Gen AI semantic conventions
  • IOtelLangfuseTrace is the scoped DI service; OtelLangfuseTrace can also be created directly
  • Observation types: OtelSpan, OtelGeneration, OtelEmbedding, OtelToolCall, OtelAgent, OtelEvent
  • Exported to Langfuse by the OTLP exporter (LangfuseOtlpExtensions.AddLangfuseExporter)

Configuration

  • LangfuseConfig (src/Langfuse/Config/LangfuseConfig.cs) - API client: URL, keys, request timeout
  • LangfuseOtlpExporterOptions (src/Langfuse/OpenTelemetry/) - OTLP exporter
  • Configurable via appsettings.json "Langfuse" section
  • Default endpoint: https://cloud.langfuse.com

Read the full file on GitHub · 112 lines

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.

  1. 18d ago Changed · -15 lines · -61 tokens per session ea4bf7b59b4f
  2. 2mo ago First seen · 127 lines · 1,076 tokens per session scan A 758190851f9e

Subscribe to this mod's changes

Langfuse-dotnet CLAUDE.md is an instructions file published in the GitHub repository lukaszzborek/Langfuse-dotnet (25 stars, last pushed today), licensed MIT. It adds 1,015 tokens to every session, about $0.0041 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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