# API Change Watch

> A structured feed of breaking changes and deprecations across major API providers, built for humans and coding agents.
> Tracks: anthropic, aws, firebase, github, google, openai, shopify, slack, stripe, twilio. Updated daily (~06:00 JST) from official changelogs, structured by LLM.

## Endpoints

- [JSON feed](https://apichangewatch.dev/feed.json): all current changes (severity, changeType, effective date, machine-searchable identifiers, source URL)
- [RSS](https://apichangewatch.dev/rss.xml): latest 50 changes for human subscription
- [Sunset calendar](https://apichangewatch.dev/calendar.ics): upcoming effective dates as all-day iCal events (subscribable)
- MCP server (Streamable HTTP, no auth): https://apichangewatch.dev/mcp
  - tool `list_breaking_changes(provider?, severity?, since?, limit?)`: filtered change list
  - tool `list_providers()`: tracked providers with per-severity counts

## Usage notes

- `surface.identifiers` are chosen to be grep-able in codebases (endpoint paths, field names, model ids)
- Changes older than 365 days are filtered out; undated announcements are kept
- Always verify against the linked source before acting. Contact: shinji.takahashi@revedge.biz