Turn Gated AI Actions Into Replayable Evidence

Lumyn is a deterministic decision gateway for production AI. Every gated action emits a durable Decision Record with a verdict and stable reason codes, so you can audit and replay.

Get Started Learn v1 Semantics

pip install lumyn && lumyn demo --story

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Decision Records

Every gated action emits a durable record with verdict, stable reason codes, and replayable digests.

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Replay Incidents

Reproduce decisions deterministically from stored records to debug and audit without guesswork.

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Policy + Memory

Gates can learn from labeled history while keeping reason codes stable and machine-readable.

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Strict Contracts

Versioned v1 schemas and strict policy validation to prevent silent drift in production.

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Fast Integration

Drop in a gateway that returns deterministic decisions and durable evidence.

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Upgrade Safely

Migrate packs and policies with explicit versioning; no breaking changes to v1 contracts.

2 Minutes to Your First Decision Record

quickstart.sh

pip install lumyn
lumyn demo --story

# Make a decision (CLI) and record it
lumyn decide --request examples/requests/decision_request.v1.json

# Fetch a Decision Record (API) and replay it
lumyn replay --pack workspace/packs/<decision_id>.json

Why Lumyn?

	Without Lumyn	With Lumyn
Can you prove why it happened?	Screenshots + logs	Durable Decision Record
Can you replay a gate?	Not reliably	Yes (deterministic)
Do decisions drift silently?	Often	Reason codes + digests
Incident resolution	Hours of guesswork	Minutes with replay

Ready to stop guessing?

From pip install to replayable decisions in minutes.

Read the Quickstart Guide