build-xopc-local-app SKILL.md skillA
build-xopc-local-app from xopcai/xopc is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add xopcai/xopc/build-xopc-local-app@git:20260921.ce4a78dPins git:20260921.ce4a78d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- xopcai/xopc
- Path
skills/engineering/build-xopc-local-app/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260921.ce4a78d, committed Sep 21, 2026
- First version recorded
- Jul 21, 2026
- Size
- 2,835 bytes
- Repository stars
- 40
- License
- MIT
Build and iteratively improve a user-owned local XOPC app while preserving its stable extension identity, UI sandbox, and Phase 1 capability boundary.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Build a local XOPC app Use this skill inside a Project created for a Local App. Treat `APP_BRIEF.md`, `.xopc/app.json`, and `xopc.extension.json` as the app contract. Convert the user's latest request into a small observable UI change, preserve working behaviour, and leave the draft previewable after every iteration. ## Required workflow 1. Read `APP_BRIEF.md`, `.xopc/app.json`, `.xopc/acceptance.json`, `xopc.extension.json`, and the current `ui/` implementation. 2. Restate the requested behaviour as observable acceptance checks. Add or update a declarative scenario in `.xopc/acceptance.json` for each critical journey changed by the request. 3. Edit the smallest coherent set of files. Phase 1 apps are UI-only; do not add backend routes, shell execution, network access, or undeclared permissions. Never edit the manifest `main` field or `.xopc/runtime/local-ui.js`; xopc owns that trusted gateway runtime entry. 4. Keep the extension `id`, page `path`, and UI `entrypoint` stable. Do not rename them during an iteration. 5. Run `node "$XOPC_LOCAL_APP_SKILL_DIR/scripts/validate-local-app.mjs" .` when that environment …
Read the whole file at its exact version.
How to install
mdr add xopcai/xopc/build-xopc-local-app@sha256:8f2141de68af2878The line at the top of this page pins the label git:20260921.ce4a78d, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_3l4nni7gcj24rqmn)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jul 21, 2026 and Sep 21, 2026, about one every 31 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260921.ce4a78d latest | 2026-09-21 | ce4a78d | 2,835 B | A | view · diff |
| git:20260916.b7327d9 | 2026-09-16 | b7327d9 | 2,779 B | A | view · diff |
| git:20260721.57e9c13 | 2026-07-21 | 57e9c13 | 2,352 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 (2835 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
xopcai/xopc · 40 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_3l4nni7gcj24rqmn GET https://markdownregistry.com/api/v1/resolve?ref=xopcai/xopc/build-xopc-local-app GET https://markdownregistry.com/api/v1/blob/8f2141de68af2878516f11ca7764510a68bed06b47652ed0c2c7f5c365071146
Your AI assistant 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.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.