Installation

Requirements

• Python 3.10, 3.11, or 3.12
• pip

Core Install

pip install longtracer

This installs the core SDK with:

• CitationVerifier — claim-level hallucination detection
• LongTracer — singleton for multi-project tracing
• SQLite and in-memory trace backends (no extra dependencies)
• longtracer CLI command

Models are downloaded automatically on first use (~100MB total):

• all-MiniLM-L6-v2 — fast bi-encoder for STS
• nli-deberta-v3-xsmall — cross-encoder for NLI

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Optional Extras

Install only what you need:

# LangChain integration
pip install "longtracer[langchain]"

# LlamaIndex integration
pip install "longtracer[llamaindex]"

# MongoDB trace backend
pip install "longtracer[mongo]"

# PostgreSQL trace backend
pip install "longtracer[postgres]"

# Redis trace backend
pip install "longtracer[redis]"

# ChromaDB + HuggingFace embeddings (for the RAG demo)
pip install "longtracer[chroma]"

# Everything
pip install "longtracer[all]"

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Verify Installation

python -c "from longtracer import CitationVerifier; print('OK')"
longtracer --help

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Upgrading

pip install --upgrade longtracer