---
title: Changelog
description: Notable changes to the ARCNM API, SDKs, and developer platform.
---

# Changelog

Notable changes to the ARCNM API, SDKs, and developer platform. The API
reference is [auto-generated from the OpenAPI spec](./api/index.md), so it
always reflects the live API; this page records the changes behind it.

> The public OpenAPI spec at
> [`/api/v1/openapi-public.json`](https://api.arcnm.io/api/v1/openapi-public.json)
> is the machine-readable source of truth — any change to the API surface
> appears there first.

---

## 2026-06-01

**Added** — Public developer portal at
[arcnm.io/docs](https://arcnm.io/docs): quickstart, authentication,
concepts, recipes, SDKs, and a full API reference.

**Added** — The API reference is now **auto-generated from the public
OpenAPI spec** on every build, so it can never drift from the running API.
Each endpoint ships request/response schemas, enum values, multi-language
samples (cURL / Python / TypeScript), and example responses.

**Added** — Machine-readable docs for AI tooling: `llms.txt`,
`llms-full.txt`, per-page Markdown, and an interactive
[API explorer](./api-explorer.md).

**Changed** — Every public endpoint now declares a typed response model, so
the generated schemas are complete.