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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 1,076 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 24repo 18d ago A scan 1,076 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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README.md
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Per session 1,076 This file is loaded in full into every session.
When invoked 1,076 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 $0.01076 $0.01076
Opus 5 $0.00538 $0.00538
Sonnet 5 $0.00215 $0.00215
Haiku 4.5 $0.00108 $0.00108

Measured 7d ago against content hash 758190851f9e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, 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 7d 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 · 127 lines

How it starts

The opening of the file, as written. The whole thing — 127 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.WebApi - Run web API example (available at localhost)

Package Management

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

Project Architecture

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.)
  • Handles batch ingestion with automatic size-based splitting (3.5MB limit)
  • Supports both immediate and background batch modes

LangfuseTrace (src/Langfuse/Services/LangfuseTrace.cs)

  • Central orchestration class for trace management
  • Manages hierarchical parent-child relationships between events/spans/generations
  • Provides scoped creation methods for automatic parent ID management
  • Core observability primitive that aggregates all events before ingestion

Event System (src/Langfuse/Models/)

  • IIngestionEvent - Base interface for all trackable events
  • CreateTraceEvent - Top-level trace container
  • CreateSpanEvent - Duration-based operations within traces
  • CreateGenerationEvent - AI model generations with LLM-specific metadata
  • CreateEvent - Discrete point-in-time events

Configuration (src/Langfuse/Config/LangfuseConfig.cs)

  • Configurable via appsettings.json "Langfuse" section
  • Supports batch mode, retry policies, timeouts, and page sizes
  • Default endpoint: https://cloud.langfuse.com

Read the full file on GitHub · 127 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. 7d 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 (24 stars, last pushed 18d ago), licensed MIT. It adds 1,076 tokens to every session, about $0.0054 per session on Opus 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.

langfuselangfuse-dotnet
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