# Agent Substrate

> Agent Substrate is an Apache-2.0 runtime that suspends idle agent 'actors' and resumes them in under a second, letting it multiplex roughly 250 stateful agents onto 8 Kubernetes pods; Google states it achieves about 10x higher density than standard container runtimes.

High-density runtime that multiplexes many stateful agents onto few Kubernetes workers.

- **Category:** Execution Sandbox
- **License:** Apache-2.0
- **Language:** Go
- **Self-hosted:** Yes
- **GitHub stars:** 4248 (2026-10-04)
- **Repository:** https://github.com/agent-substrate/substrate
- **Last verified:** 2026-10-04

> Caveat: Google open-sourced it but states it is not an officially supported Google product and was in early development (not production-ready) at verification time.

Source: https://agent.c8.fit/tools/agent-substrate/