What is app-create-checker?

A verification agent for newly generated or scaffolded apps, meaning apps created from an initial project structure.

Use it after generating or scaffolding an app to verify the result.

It checks whether the new app was properly created before further work continues.

app-create-checker — Agent for Claude Code by ryan-haver/fusebase-mcp

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/ryan-haver/fusebase-mcp

Made for: Claude Code.

Or install fusebase, the plugin that ships this one along with the rest of its 16 skills, 2 agents, 1 hook, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/agents/ryan-haver/fusebase-mcp/app-create-checker/github.svg)](https://agentmods.dev/agents/ryan-haver/fusebase-mcp/app-create-checker)

Your own site

<a href="https://agentmods.dev/agents/ryan-haver/fusebase-mcp/app-create-checker"><img src="https://agentmods.dev/badge/agents/ryan-haver/fusebase-mcp/app-create-checker/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/agents/ryan-haver/fusebase-mcp/app-create-checker"><img src="https://agentmods.dev/badge/agents/ryan-haver/fusebase-mcp/app-create-checker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 278 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 100% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00032	$0.00278
Opus 5.5	$0.00013	$0.00111
Sonnet 5.5	$0.00006	$0.00056
Haiku 4.5	$0.00003	$0.00028

Measured 1mo ago against content hash 4832244beed2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

app-create-checker scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

100% identical to app-create-checker — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

apps/client-portal-dashboard/.claude/agents/app-create-checker.md · 41 lines

What it actually says

Your mission: verify that the created app is registered in fusebase.json file.

For example folder apps has the following subfolders:

disco-planner
fitness-tracker

and fusebase.json has the following content:

{
  "orgId": "u3b",
  "productId": "bka5dyb8aqnwykiw",
  "apps": [
    {
      "id": "8cdbmfjzwskp1myp",
      "path": "apps/disco-planner",
      "dev": {
        "command": "npm run dev"
      },
      "build": {
        "command": "npm run build",
        "outputDir": "dist"
      }
    }
  ]
}

It means that only the app in the folder "disco-planner" is registered, but the app in the folder "fitness-tracker" is not registered.

So if the created app is not registered you should respond with the following message:

The app is not registered, please run fusebase CLI with appropiate command to register the app.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 41 lines · 32 tokens per session scan A 4832244beed2

Subscribe to this mod's changes

app-create-checker is an agent published in the GitHub repository ryan-haver/fusebase-mcp (8 stars, last pushed 3d ago), licensed MIT. It adds 32 tokens to every session and 278 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to app-create-checker, differing in 0 lines, and is treated as a copy.

Testing

app-create-checker next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
app-create-checkerryan-haver/fusebase-mcp	Agent	8	3d ago	MIT	A	32	Claude Code
playwright-test-generatormicrosoft/playwright	Agent	100k	today	Apache-2.0	A	151	Claude Code
.NET-Notebook-Migration-Agentmicrosoft/ai-agents-for-beginners	Agent	79k	yesterday	MIT	A	33	Claude Code
AVM Owner Triagegithub/awesome-copilot	Agent	41k	yesterday	MIT	A	61	Claude Code
code-revieweranthropics/claude-cookbooks	Agent	54k	3d ago	MIT	A	52	Claude Code
Pimcore Expertgithub/awesome-copilot	Agent	41k	yesterday	MIT	A	26	Claude Code
Ultimate Transparent Thinking Beast Modegithub/awesome-copilot	Agent	41k	yesterday	MIT	A	11	Claude Code