apiwatch

Know when an API, model, or MCP server you depend on changes, and exactly which lines of your code it breaks.

Vendors retire models, rename MCP tools, and change API behavior on a schedule you don't control. Most of these changes are announced in a changelog nobody on your team reads. apiwatch reads them for you, and its GitHub Action points at the exact lines they land on, before the shutoff date.

• The feed: reviewed records of breaking, silent, and deprecation changes from OpenAI, Anthropic, Google, Stripe, Twilio, Notion, Atlassian, GitHub, xAI, and more. Every record cites the vendor's own page and is rechecked daily. Browse it at apiwatch.reignventures.co (Atom and JSON Feed included).
• The scan: finds the call sites each change lands on in your repo. It is token aware (gpt-4 does not match gpt-4o), follows constants, reads notebooks, and separates real uses from entries in model lists.
• The brief: for each hit, what changed, where, a suggested fix, and acceptance criteria you can hand to a coding agent.
• The probe: baseline a live JSON endpoint or an MCP server's tools/list and get told when it drifts, no spec required.

What it caught

The feed holds 140 reviewed changes, each checked against the vendor's own page.

• By vendor: Google 36, Stripe 30, OpenAI 26, Anthropic 17, Notion MCP 8, Notion 6, Atlassian Rovo MCP 4, GitHub MCP Server 4, xAI 4, Twilio 3, Greenhouse 1, MCP specification 1
• By severity: breaking 102, silent 26, deprecation 12

Next dates (everything in the next 180 days):

• Nov 30, 2026, Anthropic, breaking: Anthropic will retire Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) on the Claude API on November 30, 2026; requests to it will fail after that date.
• Nov 30, 2026, Anthropic, breaking: Fast mode for Claude Opus 4.8 is deprecated and will be removed on November 30, 2026; after that, claude-opus-4-8 requests with speed "fast" return an error
• Nov 30, 2026, OpenAI, breaking: OpenAI reusable prompt objects and the v1/prompts API shut down November 30, 2026
• Dec 1, 2026, Google, breaking: From December 1, 2026, Gemini API requests for the deprecated gemini-2.5-flash are routed to gemini-3.5-flash-lite, where prefilled model turns return HTTP 400.
• Dec 1, 2026, Google, breaking: From December 1, 2026, Gemini API requests for the deprecated gemini-2.5-pro are routed to gemini-3.8-flash, where prefilled model turns return HTTP 400.

GitHub Action

name: apiwatch
on: [push, pull_request]
jobs:
  scan:
    runs-on: ubuntu-latest
    permissions: { contents: read, pull-requests: write }
    steps:
      - uses: actions/checkout@v4
      - uses: ReignVentures/apiwatch@v1
        with:
          fail-on-breaking: "true"   # fail CI when a breaking or silent change touches your code
          comment: "true"            # keep one up to date report comment on pull requests
          only-changed: "true"       # on PRs, gate only on the files the PR changes

Every run writes a short report to the job summary: which changes touch your code, how severe, whether the date is past or coming, and links to each location. Add SARIF upload to see hits as code scanning annotations:

      - uses: github/codeql-action/upload-sarif@v3
        if: always()
        with: { sarif_file: apiwatch.sarif }

Tip: add a schedule: trigger (for example daily) so you hear about new changes even when nobody is pu

... View full README on GitHub