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Dev tools · July 28, 2020

OO

oso – Open-Source Policy Engine for Authorization

Oso helps companies run agents in production with confidence using monitoring, access controls, and automated least privilege.

oso – Open-Source Policy Engine for Authorization launched on July 28, 2020 with 44 votes, #850 of 4,305 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 6 years on.

Visit osohq.com ↗Alternativestop 20% of July 2020

In plain words

Oso is an open-source policy engine designed for developers building authorization systems into applications. It provides a declarative language and framework for defining and enforcing access control rules. The engine helps teams implement complex permission logic without building authorization from scratch, making it suitable for applications requiring flexible, maintainable access policies.

written from the facts on this page · September 2026

From the sources

Next up is product, finance, and sales - the whole company. How do you get your arms around agent adoption? Find every agent running inside your company. On a laptop, in a browser, in the terminal – wherever it’s running. Shut down the unsanctioned AI. Bring all approved AI traffic under your watch – every prompt, tool call, and response. Start monitoring so you’re prepared for the next issue or question from leadership. Know when something's wrong. Get default detection for rule violations, as well as common issues like high-velocity behavior, PII leakage, and API keys. Build any rule to capture your internal AI policy, like "block unknown MCP servers," "deny all delete operations," or…from osohq.com

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