AgentBack - AI native API/MCP framework

What it does

AgentBack is an ESM/Zod/MCP fork of LoopBack 4 for building HTTP APIs and MCP servers from one codebase. Define a Zod schema once on a decorator and it becomes your request validation, OpenAPI 3.1 spec, MCP tool, and a codegen-free typed client — all from the same DI container. AI coding agents get a real contract to build against, so they can't drift into a second source of truth or a mismatched endpoint. Best practice becomes the path of least resistance. On npm today.

AgentBack gives REST, MCP, OpenAPI, typed clients, and validation one Zod contract — one schema, every boundary. Agents consume it with machine-actionable errors, /llms.txt, and MCP tools, and a coding agent can author the whole surface from it without drift.

AgentBack gives your REST endpoints, MCP tools, OpenAPI docs, typed clients, and validation one Zod contract — one schema, every boundary. Agents consume that surface with machine-actionable errors, /llms.txt , and MCP tools; and because there's a single source of truth, a coding agent can author the whole surface from it without drift. When the caller is an agent, a drifted contract isn't a stale doc — it's a failed tool call. Built on LoopBack 4's proven dependency-injection core, rebuilt for ESM and Node 22. Coming from LoopBack, NestJS, tRPC, ts-rest, or Hono? See what carries over → const City = z.object({city: z.string().min( 1 )}); const Report = z.object({summary: z.string(), tempC:…from agentback.dev

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