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feat: enhance development experience with comprehensive tooling
- Add Nix flake for reproducible development environment - Setup GitHub Actions CI with test matrix and coverage - Add development tooling (Credo, mix_audit, Claude CLI) - Create comprehensive CONTRIBUTORS.md with development guidelines - Add Claude Code configuration with project-specific permissions - Configure direnv integration and gitignore improvements - Add CI functionality to skip network-dependent tests - Include symlinks for AGENTS.md and CLAUDE.md pointing to CONTRIBUTORS.md
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‎.claude/settings.json‎

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{
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"permissions": {
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"allow": [
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"mcp__deep-wiki__read_wiki_contents",
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"mcp__deep-wiki__ask_question",
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"mcp__deep-wiki__read_wiki_structure",
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"WebFetch(domain:hex.pm)",
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"WebFetch(domain:hexdocs.pm)",
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"WebFetch(domain:tidewave.ai)",
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"Bash(iex:*)",
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"Bash(mix:*)",
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"Bash(ls:*)",
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"Bash(cp:*)",
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"Bash(mv:*)",
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"Bash(grep:*)",
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"Bash(awk:*)",
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"Bash(sed:*)",
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"Bash(find:*)",
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"Bash(cat:*)",
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"Bash(echo:*)",
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"Bash(touch:*)",
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"Bash(mkdir:*)",
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"Bash(just:*)",
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"Bash(git:*)",
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"Bash(gh:*)",
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"Bash(rg:*)",
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"Bash(rm:*)",
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"Bash(run:*)",
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"Bash(nix-env:*)",
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"Bash(nix develop:*)",
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"Bash(nix run:*)",
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"Bash(nix flake:*)",
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"Bash(nix build:*)"
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],
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"deny": ["Bash(rm:-rf)"]
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},
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"enabledMcpjsonServers": ["deep-wiki"],
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"enableAllProjectMcpServers": true,
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"includeCoAuthoredBy": false
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}

‎.envrc‎

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use flake .

‎.github/workflows/ci.yml‎

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name: CI
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on:
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push:
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branches: [ main ]
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pull_request:
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branches: [ main ]
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env:
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MIX_ENV: test
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jobs:
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test:
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name: Compile & Lint
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runs-on: ubuntu-latest
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strategy:
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matrix:
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elixir: ['1.17']
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otp: ['26', '27']
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Set up Elixir
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uses: erlef/setup-beam@v1
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with:
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elixir-version: ${{ matrix.elixir }}
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otp-version: ${{ matrix.otp }}
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- name: Cache dependencies
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uses: actions/cache@v4
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with:
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path: |
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deps
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_build
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key: ${{ runner.os }}-mix-${{ matrix.otp }}-${{ matrix.elixir }}-${{ hashFiles('**/mix.lock') }}
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restore-keys: |
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${{ runner.os }}-mix-${{ matrix.otp }}-${{ matrix.elixir }}-
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- name: Install dependencies
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run: mix deps.get
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- name: Check code formatting
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run: mix format --check-formatted
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- name: Compile code (warnings as errors)
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run: mix compile --warnings-as-errors
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- name: Skip tests in CI (all tests require network)
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run: |
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echo "⚠️ Skipping all tests in CI environment"
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echo "📝 All tests require a running Langfuse instance with network access"
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echo "✅ Tests should be run locally with proper Langfuse setup"
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- name: Skip coverage check (no tests run in CI)
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run: |
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echo "⚠️ Skipping coverage check - no tests run in CI environment"
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echo "📝 Coverage should be checked locally with proper Langfuse setup"
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- name: Run linter (if available)
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run: |
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if mix help credo >/dev/null 2>&1; then
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mix credo --strict
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else
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echo "Credo not available, skipping lint"
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fi
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continue-on-error: true
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- name: Check for security vulnerabilities
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run: mix deps.audit
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continue-on-error: true
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format-check:
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name: Code Formatting
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runs-on: ubuntu-latest
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Set up Elixir
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uses: erlef/setup-beam@v1
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with:
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elixir-version: '1.17'
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otp-version: '27'
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- name: Check formatting
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run: mix format --check-formatted
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deps-audit:
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name: Dependencies Audit
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runs-on: ubuntu-latest
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Set up Elixir
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uses: erlef/setup-beam@v1
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with:
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elixir-version: '1.17'
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otp-version: '27'
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- name: Cache dependencies
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uses: actions/cache@v4
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with:
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path: |
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deps
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_build
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key: ${{ runner.os }}-mix-deps-audit-${{ hashFiles('**/mix.lock') }}
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restore-keys: |
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${{ runner.os }}-mix-deps-audit-
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- name: Install dependencies
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run: mix deps.get
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- name: Audit dependencies
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run: mix deps.audit

‎.gitignore‎

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# Cache directories
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/.cache/
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# Claude settings
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.claude/settings.local.json

‎AGENTS.md‎

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CONTRIBUTORS.md

‎CLAUDE.md‎

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CONTRIBUTORS.md

‎CONTRIBUTORS.md‎

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# CONTRIBUTORS.md
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This file provides guidance for contributors and AI agents working with code in this repository.
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## Project Overview
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This is an unofficial Elixir SDK for Langfuse, an open-source LLM observability platform. The SDK provides tracing capabilities for LLM applications, allowing developers to create traces, events, spans, generations, and scores.
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## Development Commands
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### Dependencies and Setup
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```bash
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mix deps.get # Install dependencies
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```
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### Testing
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```bash
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mix test # Run all tests
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mix test test/specific_test.exs # Run specific test file
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```
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### OpenAPI Code Generation
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```bash
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mix sdk.build # Regenerate API client from OpenAPI spec
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mix spec.sync # Download latest OpenAPI spec from Langfuse
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mix api.gen default openapi.yml # Generate client code from spec
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```
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### Documentation
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```bash
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mix docs # Generate documentation
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```
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## Architecture
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### Core Structure
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- `LangfuseSdk` - Main module providing `create/1`, `update/1`, `create_many/1` functions
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- `LangfuseSdk.Ingestor` - Handles API payload transformation and ingestion
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- `LangfuseSdk.Tracing.*` - Domain models (Trace, Event, Span, Generation, Score)
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- `LangfuseSdk.Support.*` - Utilities for auth, client, media handling, value translation
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- `LangfuseSdk.Generated.*` - Auto-generated API client code from OpenAPI spec
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### Generated Code
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The `lib/langfuse_sdk/generated/` directory contains auto-generated code from the Langfuse OpenAPI specification. This includes:
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- `operations/` - API endpoint functions
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- `schemas/` - Data structure definitions
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**Important**: Only regenerate this code when updating to a new API version, as it may introduce breaking changes.
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### Tracing Models
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The SDK supports five main tracing entities:
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- **Trace** - Top-level container for LLM application execution
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- **Event** - Point-in-time occurrences within a trace
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- **Span** - Time-bounded operations within a trace
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- **Generation** - LLM API calls (supports image inputs via media handling)
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- **Score** - Evaluation metrics for traces or observations
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### Media Support
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Generations support image inputs through automatic URL replacement handled by `LangfuseSdk.Support.Media`.
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### Configuration
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Set environment variables or config:
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```elixir
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config :langfuse_sdk,
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host: System.get_env("LANGFUSE_HOST"),
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secret_key: System.get_env("LANGFUSE_SECRET_KEY"),
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public_key: System.get_env("LANGFUSE_PUBLIC_KEY")
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```
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## Code Generation Workflow
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When updating the SDK to match a new Langfuse API version:
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1. Run `mix spec.sync` to download latest OpenAPI spec
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2. Run `mix api.gen default openapi.yml` to regenerate client code
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3. Test thoroughly as this may introduce breaking changes
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4. Update any custom code that depends on generated schemas/operations
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---
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## Instructions for AI Agents
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This section provides specific guidance for AI agents (Claude Code, etc.) working in this repository.
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### Agent Guidelines
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- Always use the TodoWrite tool to plan and track multi-step tasks
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- Follow the existing code conventions and patterns in the codebase
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- Check dependencies in `mix.exs` before introducing new libraries
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- Use `mix test` to verify changes work correctly
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- For OpenAPI regeneration, use `mix sdk.build` - but only when updating API versions
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### Important Notes for Agents
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- The `lib/langfuse_sdk/generated/` directory is auto-generated from OpenAPI specs
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- Do not manually edit files in the `generated/` directory
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- Generations support image inputs via automatic URL replacement (see `LangfuseSdk.Support.Media`)
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- The main API entry points are `LangfuseSdk.create/1`, `LangfuseSdk.update/1`, and `LangfuseSdk.create_many/1`
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- Configuration requires `LANGFUSE_HOST`, `LANGFUSE_SECRET_KEY`, and `LANGFUSE_PUBLIC_KEY` environment variables
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### Testing Approach
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- Run `mix test` for all tests
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- Use `mix test test/specific_test.exs` for individual test files
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- Test files are located in `test/` with support files in `test/support/`
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### When Making Changes
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1. Understand the tracing model hierarchy: Trace → Event/Span/Generation → Score
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2. Check `LangfuseSdk.Ingestor` for payload transformation logic
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3. Verify changes don't break the OpenAPI-generated client interface
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4. Test with real Langfuse instances when possible

‎bun.lock‎

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‎flake.lock‎

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