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About

Agent Substrate is an open-source runtime for operating isolated, stateful agent and code-execution sandboxes on Kubernetes. It coordinates actor and worker lifecycles, places active workloads on a shared pool of ready capacity, and can suspend idle environments while preserving memory and filesystem state for later resumption. Sandboxes use gVisor or Cloud Hypervisor microVM isolation, with per-actor identity and network controls. Agent Substrate is designed for platform and infrastructure teams building agent-hosting services, coding environments, and other workloads that execute untrusted or intermittent tasks. The core project is Kubernetes-portable; Google Cloud also provides GKE-optimized deployment tooling. Optional Filestore agent volumes can persist workspaces across suspend and resume cycles.

About

Flue is an open agent framework for building durable AI agents with a programmable TypeScript harness. Created by the team behind Astro, it uses a React-like hooks API to compose agent behavior, persistent state, lifecycle events, models, tools, sandboxes, subagents, skills, and MCP servers in code. Agents are stateful and addressable over HTTP, keep context across conversations and events, and can change capabilities as work progresses. Flue records every session in a durable stream, so accepted work survives crashes, restarts, and deploys; interrupted sessions resume automatically and clients reconnect without starting over. Developers can run agents locally, in CI, from their own backend, or orchestrate them with systems such as Cloudflare Workflows and Inngest. Secure sandboxes let agents run commands, edit files, and do real work, while tools connect them to APIs and data. Flue is powered by Pi and supports different LLM providers, allowing teams to choose the models they want.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Supported
Cloud Not Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Platform and infrastructure teams building services that run isolated agent or code-execution workloads on Kubernetes.

Audience

Developers and AI engineering teams requiring a tool to build durable, stateful agents that can use tools, maintain context, and run across different models and deployment environments

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$0
Agent Substrate on GKE is offered at no extra charge. GKE pricing applies to the resources you create.
Free Version Supported
Free Trial Not Supported

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Google
Founded: 1998
United States
github.com/agent-substrate/substrate

Company Information

Flue
Founded: 2026
United States
flueframework.com

Alternatives

Alternatives

eve

eve

Vercel
Sprites

Sprites

Fly.io
StateFabric

StateFabric

J Gregory Technology Ltd.

Categories

Categories

Agentic AI Supported

Integrations

Model Context Protocol (MCP) Supported
Apache Sentry Not Supported
Braintrust Not Supported
Cloudflare Not Supported
Discord Not Supported
Google Chat Not Supported
Google Cloud Platform Supported
Linear Not Supported
Microsoft Teams Not Supported
MongoDB Not Supported
MySQL Not Supported
OpenClaw Not Supported
OpenTelemetry Not Supported
Railway Not Supported
Redis Not Supported
Resend Not Supported
Shopify Not Supported
Supabase Not Supported
Telegram Not Supported
TypeScript Not Supported

Integrations

Model Context Protocol (MCP) Supported
Apache Sentry Supported
Braintrust Supported
Cloudflare Supported
Discord Supported
Google Chat Supported
Google Cloud Platform Not Supported
Linear Supported
Microsoft Teams Supported
MongoDB Supported
MySQL Supported
OpenClaw Supported
OpenTelemetry Supported
Railway Supported
Redis Supported
Resend Supported
Shopify Supported
Supabase Supported
Telegram Supported
TypeScript Supported
Claim Agent Substrate and update features and information
Claim Agent Substrate and update features and information
Claim Flue and update features and information
Claim Flue and update features and information