mikeparcewski/change-type-detector
skills/crew/change-type-detector/SKILL.md
Classifies a list of file paths into change types (ui, api, both, unknown) using an explicit two-pass decision algorithm: extension matching first, then path-segment matching for ambiguous cases. Use when: "detect change type", "classify files", "what kind of change", "ui or api change", "change-type detection", or before creating test tasks.
$ install --global
skillsauthnpx skillsauth add mikeparcewski/wicked-garden change-type-detectorInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: May 7, 2026, 6:22 AM144.7s2 files scanned
SKILL.md
- name:
- change-type-detector
- description:
- |
- using an explicit two-pass decision algorithm:
- extension matching first,
- Use when:
- detect change type", "classify files", "what kind of change",
- phase_relevance:
- ["*"]
- archetype_relevance:
- ["*"]
Change Type Detector Skill
Classify file paths to determine which test types are needed.
Output Format
{
"change_type": "ui|api|both|unknown",
"ui_files": [...],
"api_files": [...],
"ambiguous_files": [...],
"confidence": 0.0-1.0,
"reasoning": "file1: reason; file2: reason; ..."
}
Two-Pass Classification Algorithm
Apply to EACH file independently, then combine results.
Pass 1 — Extension Matching (ordered)
Rule 1.1 — UI Extensions (unambiguous by default)
Files with these extensions classify as ui:
.tsx, .jsx, .vue, .svelte, .html, .htm, .css, .scss, .sass, .less
Exception — .tsx-in-api/ override rule (apply before returning ui):
If a UI-extension file has API path segments (api, routes, controllers,
handlers, endpoints, server, backend, services, graphql, rest, grpc,
middleware, resolvers, mutations, queries) AND no UI path segments,
AND the task description contains API keywords — classify as api.
Otherwise keep ui (extension wins).
Rule 1.2 — API-Confirming Extensions
Files with .py, .rb, .go, .java, .kt, .rs, .cs, .php, .scala, .clj, .ex, .exs:
- If path has API segments →
api - If path has UI segments →
ambiguous(treat as both) - Otherwise →
api(default for backend languages)
Rule 1.3 — Ambiguous Extensions
Files with .ts, .js, .mjs, .cjs → proceed to Pass 2.
Rule 1.4 — Unrecognized Extensions
All other extensions (.md, .yaml, .json, .sh, Makefile, etc.):
- If path has UI segments only →
ui - If path has API segments only →
api - If path has both →
ambiguous - If path has neither →
unrecognized(does not contribute to change type)
Pass 2 — Path Segment Matching (for .ts/.js/.mjs/.cjs only)
Check path segments (split on /, lowercase) against segment tables.
| Outcome | Condition |
|---------|-----------|
| ui | Has UI segment, no API segment |
| api | Has API segment, no UI segment |
| Use task description | Has both UI and API segments |
| Use task description | Has neither UI nor API segment |
Task description tiebreaker: tokenize description on non-alphanumeric characters, check against API keywords and UI keywords (see File Classification Rules).
- API keywords only →
api - UI keywords only →
ui - Both or neither →
ambiguous
Combining File Results
After classifying all files:
| Files Present | change_type | confidence |
|---------------|-------------|------------|
| Only ui_files | ui | 1.0 |
| Only api_files | api | 1.0 |
| Both ui + api | both | 0.9 |
| ambiguous_files present | promotes to both | 0.7 |
| Only unrecognized | unknown | 0.8 |
| No files | unknown | 1.0 |
Ambiguous files are conservative: they promote the result to both (over-inclusive).
Quick Decision Table
| Extension | Path Signals | Task Keywords | Result |
|-----------|-------------|---------------|--------|
| .tsx/.jsx/.vue/.svelte | — | — | ui |
| .tsx + api/ path | API kws in desc | yes | api |
| .css/.scss/.sass/.less | — | — | ui |
| .html/.htm | — | — | ui |
| .py/.rb/.go/.java/.kt | api/ path | — | api |
| .py/.rb/.go/.java/.kt | — (no path) | — | api |
| .ts/.js | components/ | — | ui |
| .ts/.js | api/ routes/ | — | api |
| .ts/.js | neither | API kws | api |
| .ts/.js | neither | UI kws | ui |
| .ts/.js | neither | neither | ambiguous |
| .md/.yaml/.json | — | — | unrecognized |
See File Classification Rules for the complete extension tables, path segment tables, and keyword lists.
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