js-apps SKILL.md skillA
js-apps from istin/flutter_agent_harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add istin/flutter_agent_harness/js-apps@git:20261005.7105506Pins git:20261005.7105506 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- istin/flutter_agent_harness
- Path
prompts/skills/js-apps/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261005.7105506, committed Oct 5, 2026
- Size
- 72,615 bytes
- Repository stars
- 78
- License
- MIT
Create JS apps (jsr.render UI) that run inside Fa's Apps section — manifest.json + widget.js in the apps/ folder.
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
# Fa JS App Development Skill
> **For the Fa coding agent**: This is the authoritative guide for creating JS apps that run inside the Fa Flutter app. Read the **Quick Start** first — it shows the minimal workflow.
---
## ⛔ HARD RULES (never break these)
1. **NEVER hardcode API keys, tokens, or provider endpoints in app code.** Apps get credentials from the host: read one with `jsr.fa.keys.get('NAME')`, ask the user for a missing one with `jsr.fa.keys.request('NAME', reason)` (declare `"keys": true` in `manifest.json`). A key a user granted lands in their Fa Keys store — reuse it, never paste it into `widget.js`.
2. **ALL model calls go through the host bridges** — LLM via `jsr.fa.llm` / `jsr.fa.llm.chat` / `jsr.fa.llm.stream`, media via `jsr.fa.media.*`. NEVER fetch a model provider's API directly (no `api.openai.com` etc. in `jsr.fetchJson`): the user's configured models and media slots are the ones to reuse, and their keys never belong in app code.
…Read the whole file at its exact version.
How to install
mdr add istin/flutter_agent_harness/js-apps@sha256:285b7631e7b921d8The line at the top of this page pins the label git:20261005.7105506, 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_hx4orrjxuw74ojyb)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 5, 2026.
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 (72615 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
istin/flutter_agent_harness · 78 stars · license MIT · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_hx4orrjxuw74ojyb GET https://markdownregistry.com/api/v1/resolve?ref=istin/flutter_agent_harness/js-apps GET https://markdownregistry.com/api/v1/blob/285b7631e7b921d86ea1abd1ee6aae5e434c0a3faa40459d8092f0347cb0dcee
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.