Sub-second RAG regression testing for production pipelines

Quick Start • Documentation • Python API • CI/CD

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Overview

"Did my last commit break retrieval?" — now you know in seconds.

LongProbe is a sub-second RAG regression harness. Define your Golden Questions once, run longprobe check on every commit, and get an exact diff of which document chunks were lost in your latest change — before your users notice.

Think pytest --watch for your RAG pipeline.

🎬 Demos

Complete Workflow

Full RAG regression testing workflow: auto-capture golden questions, run tests, save baseline, detect regressions.

Monitor RAG Quality

Detailed quality monitoring with Python API and comprehensive results.

Detect Regressions

Baseline comparison and regression detection with deployment verdict.

Why LongProbe?

Every RAG developer faces the same silent killer: you refactor chunking strategy, upgrade LangChain, or add a new document — and your retrieval silently degrades. DeepEval and RAGChecker are heavyweight evaluation frameworks meant for batch analysis, not fast regression checks in a dev loop.

LongProbe gives you instant feedback:

• ⚡ Sub-second checks on small golden sets
• 🔍 Exact diffs showing which chunks were lost/gained
• 📊 Recall scores with per-question breakdown
• 💾 Baseline tracking to catch regressions over time
• 🧪 pytest integration for existing test suites
• 🔌 Pluggable adapters for any vector store

Part of the Long Suite

LongProbe is part of the EnDevSols Long Suite of RAG tools:

• LongParser - Document ingestion and chunking
• LongTrainer - RAG chatbot framework
• LongTracer - Hallucination detection
• LongProbe - Retrieval regression testing ← You are here

Together they cover the full RAG pipeline from ingestion to production monitoring.

Features

• ⚡ Sub-second checks on small golden sets
• 📋 Golden Questions + Required Chunks defined in simple YAML
• 🔍 Three match modes: exact ID, text substring, semantic similarity
• 📊 Recall Score with per-question breakdown
• 🔄 Regression diff: exactly which chunks were lost/gained
• 💾 SQLite baseline store: compare against any previous run
• 🧪 pytest plugin: integrate into existing test suites
• 🔌 Pluggable adapters: LangChain, LlamaIndex, Chroma, Pinecone, Qdrant
• 🖥️ Beautiful CLI with Rich tables, JSON, and GitHub Actions output
• 👀 Watch mode: auto re-run on file changes
• 🏗️ CI/CD ready: fails pipeline on regression

Quick Start

Installation

# Install with UV (recommended)
uv pip install longprobe

# Install with pip
pip install longprobe

# Install with optional dependencies
uv pip install longprobe[chroma]      # ChromaDB support
uv pip install longprobe[openai]      # OpenAI embeddings
uv pip install longprobe[all]         # Everything

Initialize

longprobe init

This creates:

• .longprobe/ — directory for baseline storage
• goldens.yaml — example golden questions
• longprobe.yaml — configuration file

Define Golden Questions

Edit goldens.yaml with your test cases:

name: "my-rag-golden-set"
version: "1.0"

questions:
  - id: "q1"
    question: "What is the termination clause?"
    match_mode: "id"            # exact chunk ID match
    required_chunks:
      - "contracts_chunk_42"
      - "contracts_chunk_43"
    top_k: 5
    tags: ["contracts", "critical"]

  - id: "q2"
    question: "What are the payment terms?"
    match_mode: "text"          # substring match
    required_chunks:
      - "net 30 days from invoice"
    top_k: 5

  - id: "q3"
    question: "Who can sign contracts?"
    match_mode: "semantic"      # embedding similarity
    semantic_threshold: 0.80
    required_chunks:
      - "The following officers are authorized to sign"
    top_k: 10

Configure Your Retriever

Edit longprobe.yaml:

retriever:
  type: "chroma"
  chroma:
    persist_directory: "./chroma_db"
    collection: "my_documents"

embedder:
  provider: "local"
  model: "text-embedding-3-small"

scoring:
  recall_threshold: 0.8
  fail_on_regression: true

baseline:
  db_path: ".longprobe/baselines.db"
  auto_compare: true

Run Checks

# Run against live vector store
longprobe check --goldens goldens.yaml

# Override settings
longprobe check --threshold 0.9 --top-k 10

# JSON output for automation
longprobe check --output json

# GitHub Actions annotations
longprobe check --output github

CLI Reference

Core Commands

Command	Description
longprobe init	Create starter configuration files
longprobe check	Run probes against the golden set
longprobe diff	Compare current results against baseline
longprobe baseline save	Save current results as baseline
longprobe baseline list	List all saved baselines
longprobe watch	Watch golden file and re-run on changes
longprobe generate	Auto-generate Golden Questions from documents
longprobe capture	Build goldens.yaml by querying your retriever

Examples

# Initialize project
longprobe init

# Run checks with custom config
longprobe check -g goldens.yaml -c longprobe.yaml

# Save baseline for comparison
longprobe baseline save --label v1.0

# Compare against baseline
longprobe diff --baseline v1.0

# Watch mode for development
longprobe watch --interval 2

# Generate questions from documents
longprobe generate ./docs --capture --auto

Python API

Basic Usage

from longprobe import LongProbe
from longprobe.adapters import create_adapter

# Create adapter for your vector store
adapter = create_adapter(
    "chroma",
    collection_name="my_documents",
    persist_directory="./chroma_db"
)

# Create and run probe
probe = LongProbe(
    adapter=adapter,
    goldens_path="goldens.yaml",
    config_path="longprobe.yaml"
)
report = probe.run()

print(f"Overall Recall: {report.overall_recall:.2%}")
print(f"Pass Rate: {report.pass_rate:.2%}")

Baseline Management

from longprobe import LongProbe
from longprobe.adapters import create_adapter

adapter = create_adapter("chroma", collection_name="docs", persist_directory="./db")
probe = LongProbe(adapter=adapter, goldens_path="goldens.yaml")

# Run and save baseline
report = probe.run()
probe.save_baseline(label="v1.0")

# After making changes...
report2 = probe.run()

# Compare against baseline
diff = probe.diff(baseline_label="v1.0")
print(f"Regressions: {len(diff['regressions'])}")
print(f"Improvements: {len(diff['improvements'])}")

With LangChain

from longprobe import LongProbe
from longprobe.adapters import LangChainRetrieverAdapter

# Wrap your existing LangChain retriever
adapter = LangChainRetrieverAdapter(your_langchain_retriever)
probe = LongProbe(adapter=adapter, goldens_path="goldens.yaml")
report = probe.run()

assert report.overall_recall >= 0.85, f"Recall too low: {report.overall_recall}"

With LlamaIndex

from longprobe import LongProbe
from longprobe.adapters import LlamaIndexRetrieverAdapter

adapter = LlamaIndexRetrieverAdapter(your_llamaindex_retriever)
probe = LongProbe(adapter=adapter, goldens_path="goldens.yaml")
report = probe.run()

Pytest Integration

Configuration

# conftest.py
import pytest
from longprobe import LongProbe
from longprobe.adapters import create_adapter

@pytest.fixture
def probe():
    adapter = create_adapter(
        "chroma",
        collection_name="test_docs",
        persist_directory="./test_db"
    )
    return LongProbe(
        adapter=adapter,
        goldens_path="tests/goldens.yaml",
        recall_threshold=0.85
    )

Writing Tests

def test_retrieval_recall(probe):
    report = probe.run()
    assert report.overall_recall >= 0.85, (
        f"Recall dropped to {report.overall_recall:.2f}"
    )

def test_no_regression_vs_baseline(probe):
    report = probe.run()
    assert not report.regression_detected, (
        f"Regression detected! Delta: {report.recall_delta}"
    )

Retriever Adapters

LongProbe supports multiple vector stores and retrieval frameworks:

Adapter	Type	Configuration
ChromaDB	Direct	type: chroma
Pinecone	Direct	type: pinecone
Qdrant	Direct	type: qdrant
HTTP API	Direct	type: http
LangChain	Programmatic	LangChainRetrieverAdapter
LlamaIndex	Programmatic	LlamaIndexRetrieverAdapter

ChromaDB Example

retriever:
  type: chroma
  collection: my_collection
  persist_directory: ./chroma_db

HTTP API Example

retriever:
  type: http
  url: "http://localhost:8000/api/retrieve"
  method: "POST"
  body_template: '{"query": "{question}"}'
  response_mapping:
    results_path: "data.chunks"
    text_field: "content"

GitHub Actions

name: RAG Regression Check

on: [push, pull_request]

jobs:
  rag-probe:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: astral-sh/setup-uv@v4
      - run: uv pip install longprobe[chroma]
      - name: Run RAG regression check
        run: longprobe check --goldens goldens.yaml --output github
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}

Match Modes

ID Match (match_mode: "id")

Exact string match on chunk/document IDs. Best when you control the IDs in your vector store.

Text Match (match_mode: "text")

Case-insensitive substring matching. Checks if the required text appears anywhere in the retrieved documents.

Semantic Match (match_mode: "semantic")

Word-frequency cosine similarity. Useful when exact text may vary but meaning should be preserved.

Development

# Install for development
git clone https://github.com/ENDEVSOLS/LongProbe.git
cd LongProbe
uv sync --dev

# Run tests
uv run pytest tests/unit/ -v
uv run pytest tests/ -v --run-integration

# Lint and format
uv run ruff check src/
uv run ruff format src/

How It Works

goldens.yaml → GoldenLoader → QueryEmbedder → RetrieverAdapter → RecallScorer
                                                                      ↓
                                                                BaselineStore → DiffReporter

1. Define your Golden Questions + Required Fact Chunks in YAML
2. Embed each question using your configured embedding model
3. Retrieve from your live vector store using the pluggable adapter
4. Score each question by checking if required chunks appear in Top-K results
5. Compare against saved baselines to detect regressions
6. Report a Recall Score, diff of lost chunks, and optionally fail CI/CD

Contributing

We welcome contributions! Please see CONTRIBUTING.md for guidelines.

Security

For security issues, please see SECURITY.md.

License

MIT License — see LICENSE for details.

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Website • GitHub • Documentation