watchlight-engine

The in-process authorization engine behind Watchlight Developer Edition.

watchlight-engine lets a Python agent make a real authorization decision — ALLOW / DENY — for a tool call, in-process, with zero infrastructure: no database, no network, no sidecar. It ships as a prebuilt, self-contained compiled wheel.

Most developers want the watchlight package, the Developer Edition with an ergonomic decorator API. This watchlight-engine package is the lower-level engine it embeds — install it directly only if you are building on the engine yourself.

Install

pip install watchlight-engine

Prebuilt wheels are provided for Linux (x86_64, aarch64), macOS (Apple Silicon and Intel), and Windows (x64), for CPython 3.9 and newer. No Rust toolchain is required.

Quickstart

import watchlight_engine

engine = watchlight_engine.PolicyEngine()
assert engine.ready()

# Load a policy, then authorize a request — a real decision, in-process.
engine.add_policy(policy_json)
decision = engine.authorize(request_json)
print(decision)   # -> Allow / Deny with the governing reason

See the Watchlight documentation for policy and request shapes, and the Developer Edition guide for the full workflow.

What you get

A real, in-process policy decision — the same authorization engine that powers the Watchlight platform, embedded so you can enforce governance without standing up any services.
Fail-closed by design: ambiguity denies.
A single prebuilt wheel per platform — install and go.

Developer Edition vs. Enterprise

The Developer Edition is for building and evaluating locally. The full Watchlight platform adds the governed control plane — centralized policy, tamper-evident lineage and audit, runtime enforcement across your fleet, drift and anomaly detection, secrets brokering, and the operator dashboard. See watchlight.ai to learn more.

License

The Developer Edition license lets you install and use watchlight-engine for free for internal development, testing, and evaluation. Production, commercial, or third-party-service use requires a commercial license — contact legal@watchlight.ai. Redistribution, reverse-engineering, and sublicensing are not permitted. See the bundled LICENSE for the full terms.

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watchlight_engine-0.1.2-cp39-abi3-win_amd64.whl (2.7 MB view details)

Uploaded Aug 18, 2026 CPython 3.9+Windows x86-64

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Uploaded Aug 18, 2026 CPython 3.9+manylinux: glibc 2.17+ x86-64

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Uploaded Aug 18, 2026 CPython 3.9+manylinux: glibc 2.17+ ARM64

watchlight_engine-0.1.2-cp39-abi3-macosx_11_0_arm64.whl (2.4 MB view details)

Uploaded Aug 18, 2026 CPython 3.9+macOS 11.0+ ARM64

watchlight_engine-0.1.2-cp39-abi3-macosx_10_12_x86_64.whl (2.6 MB view details)

Uploaded Aug 18, 2026 CPython 3.9+macOS 10.12+ x86-64

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This release

0.1.2

Aug 18, 2026

0.1.1

Aug 18, 2026

0.1.0

Aug 18, 2026

watchlight-engine 0.1.2

watchlight-engine

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