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Mirrors

Rebuilds the systems your agents call so you can replay real sessions and catch regressions pre-deploy

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freemiumUsage-based and billed by the replay-minute — a minute of sandbox time an agent spends replaying a session or running an eval. The free tier includes 60 replay-minutes per month and $0 is due today, although choosing it does securely save a payment method. Past the included minutes usage is $0.20 per replay-minute, billed monthly. Building environments, exploring them and the dashboard itself are always free; the meter only runs while an agent is actually executing. Enterprise is custom-priced with volume rates, SSO and role controls, a security review, and on-prem / BYOC deployment. No seat licences and no commitment — cancelling drops you back to Free with environments and history intact.View full pricing →

Visit Mirrors

https://runmirrors.com

About Mirrors

Mirrors is a staging environment for AI agents. The problem it targets is specific: an agent that calls internal tools, databases and third-party APIs has no safe place to be tested, because nobody will hand out a test instance of the billing system or the reservation backend, and replaying production traffic against the real thing means real refunds and real emails. Mirrors takes what you already have — a trace export, the agent's code, the tool definitions, or docs — and mines a runnable copy of those systems from it: schema, seed data and tool behaviour, ready in minutes rather than after a quarter of environment work. Once the environment exists, past sessions replay against it on every pull request, so a change that makes the agent issue a second refund on the same order fails a CI gate instead of reaching a customer. A collector can stream live sessions from production afterwards to keep the mirror in step as the real systems drift. It drops into the frameworks teams already use — LangChain, LangGraph, LlamaIndex, CrewAI, AutoGen, Pydantic AI, smolagents, Google ADK, the Vercel AI SDK, Mastra — and speaks MCP, so Claude Code, Codex, Cursor and Windsurf sessions can be replayed too. There is a public /v1 API and a CI gate, and the company is a Y Combinator company.

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Key Features

Mines a runnable environment from traces, agent code, tool code or docs
Replays past sessions against two agent versions side by side
CI gate that fails a PR when a change breaks a previously-good session
Collector keeps the mirror in step with production drift
Drops into LangChain, LangGraph, CrewAI, AutoGen, Mastra, MCP and the AI SDK
Public /v1 API

Mirrors Pros & Cons

Pros

  • +Solves the 'nobody will give me a test instance of the internal tool' problem directly
  • +Per-minute billing means idle environments cost nothing
  • +Framework-agnostic rather than tied to one agent SDK

⚠️ Cons

  • Environment fidelity depends on the quality of the traces you feed it
  • Replay-minute billing is hard to forecast before you know your CI volume
  • Early-stage — the published plan ladder is Free and Enterprise only

Tags

agent-testingstagingreplayevalsciregression
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