Fastagent

Fastagent is an open-source CLI tool that turns chat agent descriptions into local apps and deploys them to Cloud Run.

Fastagent is an open-source command-line interface that allows builders to create and deploy chat agents using coding assistants like Claude Code, Codex, Grok, or Pi. Users describe the desired chat agent, test it locally, review the upload, and deploy it to their own Google Cloud Run or Railway account. The tool generates a private HTTPS address for applications to send messages to, handles streaming replies, and maintains conversation memory. It is designed for developers who want to integrate custom chat agents into their own websites, applications, or bots without managing server infrastructure. The system secures access with a single bearer token and keeps all data and billing within the user's personal cloud account.

Fastagent at a glance

Best for: Software engineer, Founder
Runs on: CLI, API
Pricing: Free and open source under Apache 2.0
Released: October 2026
Category: AI coding tool
Website: evabench.dev

Key features

Generate chat agents from text descriptions
Run and test agents locally
Deploy applications to Google Cloud Run
Deploy applications to Railway
Provide a private HTTPS address for messaging
Stream replies and remember conversations
Secure access with a single bearer token

Use it for

Build a support bot that answers return policy questions
Look up customer order status via chat
Deploy custom chat agents to personal cloud accounts

Alternatives to Fastagent

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Google Agents CLI — Turns coding agents into experts at building and deploying Google Cloud agents.
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OpenCode — Works with 75+ model providers, local models, and existing subscriptions
Cloudflare Agents — Runs agents on a global network with durable storage and real-time connections.
Genkit — Provides unified APIs and local developer tools for AI application workflows.
Discord CLI — Run Discord operations from shell scripts, cron jobs, CI, or AI agents using JSON output.
ChatDev — Build and execute customized multi-agent systems rapidly through simple configuration without coding.
Agenta — Build and automate AI agents that run on your own infrastructure or the cloud.
Tunr — Deploys agent-built software and shares local dev servers instantly via a single command.
ChatBotKit — Launch production-ready AI agents from ready-made solutions with built-in security.

All Fastagent alternatives