Archal × YC

Archal gives coding agents and integration engineers isolated, stateful sandboxes for the APIs they actually ship against, including GitHub, Slack, Stripe, Datadog, Linear, Jira, HubSpot, Supabase, Sentry, and about twenty more services accessible over REST or MCP. Each sandbox behaves like the real service, holds state across tool calls, and resets to a known baseline in milliseconds, which removes the usual friction of maintaining test accounts, hitting third-party rate limits, or debugging flaky mocks that drift from production behavior. The launch matters now because agent teams are moving from demos into CI and evals, where a run that mutates a real Slack workspace or Stripe account is a real problem. Archal targets three concrete workflows: harness testing where changes persist across an agent's tool calls, per-branch integration testing without shared accounts, and reinforcement learning rollouts that start from an identical state every episode. It plugs into Braintrust, LangSmith, or a custom eval stack, and works with coding agents like Codex, Claude Code, and Cursor. Archal is part of Y Combinator's Summer 2026 batch, founded by Aidan Tiruvan and based in San Francisco with a team of two. New accounts get twenty dollars of usage credit to try it, with additional credits available for startups doing heavier QA.