Tom Nguyen:

Fabric gives Pi one programmable tool called fabric_exec, which composes core tools and MCP servers with captured extension tools in a checked TypeScript program. That program can call agents or actors, use durable coordination, and run inside QuickJS. Trusted workloads that exceed WASM32 memory may use the unsafe Node process. After execution, the conversation receives the result of the program’s branches, loops, fan-out, and data flow.

🏆 100% on ARC-AGI-3. A Fabric-powered agent won all 25 environments in one 22.4-hour session with 4 minutes of human time ($1,349 in model spend).