Building custom Synapse extensions

You can build your own extensions using Starlark scripts or any programming language that compiles to web assembly (WASM).

Prefer to let an AI agent do the scaffolding? The Cerbos Agent Skill for Synapse extensions can generate the extension, configuration and tests to run it locally. You can install the skill with npx skills add cerbos/skills --skill cerbos-synapse-extension.

Scripting extensions with Starlark
Developing WASM extensions
- Tutorial: Build a WASM extension in Go
- Tutorial: Build a WASM extension in TypeScript
Testing extensions