# Osprey: Open Sourcing our Rule Engine

DevFeed: [Osprey: Open Sourcing our Rule Engine](<https://devfeed.tech/articles/osprey-open-sourcing-our-rule-engine-272.md>)

Original publisher: [Read original article](<https://discord.com/blog/osprey-open-sourcing-our-rule-engine>)

Author: Discord Engineering

Published: 2026-02-19T00:00:00Z

Content type: article

Language: en

Sources: [Discord Blog](<https://devfeed.tech/sources/discord-blog.md>)

Topics: [Discord](<https://devfeed.tech/topics/discord.md>), [Open Source](<https://devfeed.tech/topics/open-source.md>), [real-time](<https://devfeed.tech/topics/real-time.md>), [gRPC](<https://devfeed.tech/topics/grpc.md>), [Standard ML](<https://devfeed.tech/topics/standard-ml.md>)

Tags: [customers](<https://devfeed.tech/tags/customers.md>), [debugging](<https://devfeed.tech/tags/debugging.md>), [discord](<https://devfeed.tech/tags/discord.md>), [open-source](<https://devfeed.tech/tags/open-source.md>), [real-time](<https://devfeed.tech/tags/real-time.md>), [tool](<https://devfeed.tech/tags/tool.md>)

## AI overview

Discord introduces Osprey, an open-source safety rules engine developed with ROOST and the internet.dev team. It processes real-time platform activity through expressive SML rules, supports synchronous gRPC and asynchronous message-queue inputs, and produces transparent verdicts and investigation data.

## Source excerpt

Discord uses Osprey to quickly detect and remove new types of harm from putting our customers at risk. Now we're open-sourcing this tool so others can do the same.