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As of October 2026. This page is a short orientation, not a benchmark. The TypeScript agent space moves fast: most of the projects below now ship durable approvals, evals and coding-agent harnesses of their own, so check their documentation before deciding. Rows about lousho describe this repository and link to the page that documents each claim.

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Each project in one row

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What lousho still does differently

Each item is checkable in this repository.
  • Record/replay cassettes and trajectory drift in one CLI. lousho eval --record runs every case against the real provider once and writes a cassette, --replay runs them in CI with no network and no API key, and --drift re-records into a temp directory and reports how each case’s tool-call trajectory changed (Evals, Testing).
  • Durable approvals on Cloudflare Workers KV as well as memory, file and SQLite, with the same needsApproval / resumeAfterApproval() code on each (Durable execution, Cloudflare Workers).
  • Editor and MCP surfaces from the same agent. lousho acp serves any agent to Zed and other Agent Client Protocol editors (ACP); serveMcp exposes it as an MCP server to Claude Code, Cursor and other clients (MCP).
  • Self-hosted, one package, no platform account. Runs in your Node process or a Worker; nothing calls home and there is no hosted control plane to sign up for.
  • Spans AI SDK majors. The ai peer dependency accepts ^4.3.19, ^6 and ^7, so an existing app can adopt lousho without first upgrading the AI SDK (Installation).

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Where lousho is weaker

  • Alpha, one maintainer. The 1.0 line is still 1.0.0-alpha.*. Expect API churn, a small community and few third-party integrations.
  • No Postgres store. Checkpoint and approval stores ship for memory, file, SQLite and Cloudflare KV. Mastra and LangGraph ship Postgres; here you implement the small CheckpointStore / ApprovalStore interfaces yourself.
  • Fewer native providers. OpenAI, Anthropic, OpenRouter, Ollama and the Pi catalog are built in; anything else goes through fromAiSdk() (Providers).
  • No hosted dashboard. Traces are OpenTelemetry spans you send to your own backend (Observability); there is no equivalent of LangSmith, VoltOps or Mastra’s playground.
  • The root entry point is not edge-safe. Cloudflare Workers use the dedicated worker build and subpaths (Cloudflare Workers).
  • Live runs are manual. CI runs offline tests and cassette replays; live-provider checks are run by hand.

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Picking one

If you only need model calls with streaming UI, the Vercel AI SDK alone is the simpler choice. If you want a ready-made coding agent, start from the Claude Agent SDK or an AI SDK harness. If you want an all-in-one framework with a dev UI and Postgres, look at Mastra; if your control flow is a graph, LangGraph.js; if you deploy on Vercel, eve. Pick lousho when you want offline record/replay evals, approvals that survive a restart on your own stores (including Workers KV), and one self-hosted package you can also serve over ACP and MCP.