breaking-changes skillA
breaking-changes is agent-read markdown (skill) from fusengine/agents: Use when checking whether a Claude Code update breaks our plugin ecosystem — hooks, agent frontmatter, manifest schema, or skill format..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
<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 Type | Severity | Example | |-------------|----------|---------| | Removed API | BREAKING | Hook type deleted | …
Read the whole file at its exact version.
How to install
mdr add fusengine/agents/breaking-changes@git:20260729.3b91eedmdr add fusengine/agents/breaking-changes@sha256:8659236400ec9c3ePin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_ho6fd5tsbisj3g72)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260729.3b91eed latest | 2026-07-29 | 3b91eed | 1,764 B | A | view · diff |
| git:20260705.ba8ee52 | 2026-07-05 | ba8ee52 | 1,454 B | A | view · diff |
| git:20260705.8c2f9bc | 2026-07-05 | 8c2f9bc | 1,452 B | A | view · diff |
| git:20260221.ef8fc89 | 2026-02-21 | ef8fc89 | 1,314 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (1764 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
fusengine/agents · 28 stars · license MIT · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ho6fd5tsbisj3g72 GET https://markdownregistry.com/api/v1/resolve?ref=fusengine/agents/breaking-changes GET https://markdownregistry.com/api/v1/blob/8659236400ec9c3ee93238f91ed4b2308a878c4fd97eb9ca9d160ebc703212ce
Your agent does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.