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Breaking changes

Skill fusengine/agents/plugins/changelog-watcher/skills/breaking-changes

Use when checking whether a Claude Code update breaks our plugin ecosystem — hooks, agent frontmatter, manifest schema, or skill format.From its SKILL.md

Install
npx -y skills add fusengine/agents --skill breaking-changes

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

One thing to look at

  • 22 stars22 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

SKILL.md

1.7 KB, 337 tokens by cl100k_base, as published. Nobody here has run it

<objective> Detects breaking changes in Claude Code updates by diffing the current API surface (hook types and matchers, agent frontmatter fields, plugin manifest schema, SKILL.md format, script CLI flags — tracked in `references/api-surface.md`) against the official changelog. Greps our plugins for each changed API and reports impact mapped to specific file:line locations, classified by severity (BREAKING / DEPRECATED / NEW). </objective>

Breaking Changes Detection Skill

Overview

Compares Claude Code API changes against our plugin ecosystem to detect compatibility issues.

API Surface File

The api-surface.md reference contains our current known API:

  • Hook types and their matchers
  • Agent frontmatter fields
  • Plugin manifest schema
  • Skill SKILL.md format
  • Script CLI flags used

Detection Workflow

  1. Load current api-surface.md
  2. Fetch latest Claude Code API docs
  3. Diff for added/changed/removed APIs
  4. Grep our plugins for each changed API
  5. Report with file:line impact mapping

Impact Assessment

Change TypeSeverityExample
Removed APIBREAKINGHook type deleted
Changed schemaBREAKINGFrontmatter field renamed
New required fieldBREAKINGMandatory new param
Deprecated APIDEPRECATEDOld hook still works
New optional APINEWNew hook type added

References

What ships with it: 2 files

8.2 KB alongside SKILL.md

references/

Keep looking

Skills are one crate of 326,512. Ordering is by how many stacks a row turns up in, so the top of any crate is what has actually been picked rather than what has the most stars.