# Meso — developer portal

> Scoped index for building on Meso. Meso is a periodized strength-training program that designs and rebuilds block-periodized programs. See the site-wide index at https://meso.fitness/llms.txt and the API context at https://meso.fitness/api/llms.txt.

## Start here

- [Developer portal (HTML)](https://meso.fitness/developers.html) — overview, quickstart, sandbox, errors.
- [Developer portal (Markdown)](https://meso.fitness/developers.md) — same content, agent-friendly.

## Build & integrate

- [OpenAPI 3.1 spec](https://meso.fitness/openapi.json)
- [MCP server card](https://meso.fitness/.well-known/mcp/server-card.json)
- [Auth walkthrough](https://meso.fitness/auth.md)
- [Resource discovery (ARD)](https://meso.fitness/.well-known/ard.json)

## Onboarding

- three free program generations, no time limit. Self-serve OAuth client registration via the `registration_endpoint` in the authorization-server metadata.
- Sandbox: https://sandbox.api.meso.fitness — seeded test data, safe for agents.

## Key facts

- Status: Meso web app available now. HTTP API in development (not yet publicly available).
- Contact: hello@meso.app