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by io.github.akiba-labs
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App Store 4.2 / 4.3 / metadata rejection precheck

app_store_wrapper_precheck
Read-onlyIdempotent

For Capacitor, WebView, PWA-shell, React Native, or AI-generated iOS apps: scores rejection risk under Guideline 4.2 (minimum functionality / web wrapper), 4.3 (spam / clone), and metadata, with reasons and how native each feature reads. Not legal advice; Apple decides.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "name": "<name>",
      "description": "<description>",
      "stack": "<stack>",
      "features": "<features>"
    },
    "name": "app_store_wrapper_precheck"
  }
}

Input Schema

NameRequiredDescriptionDefault
nameYesApp name.
stackYesHow the app is built.
featuresYesUp to three key features, e.g. ["Home screen widget", "iOS share sheet", "Face ID lock"].
descriptionYesOne-line description of what the app does.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.2/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnly, idempotent, closed-world, non-destructive, so the safety profile is covered. The description adds real context beyond that: what the score is broken down into (per-guideline reasons and a per-feature nativeness read) and an expectation-setting disclaimer that Apple is the final decider, not the tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two compact sentences, front-loaded with the target audience and the guidelines being scored. The trailing disclaimer is short and earns its place by capping liability expectations.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema, the description carries the return-value burden and does state what comes back (reasons and a nativeness assessment). It could say more about the score scale or output shape, but for a read-only analysis tool this is close to complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so all four parameters are already documented in the schema, which sets the baseline at 3. The description restates the stack domain but adds no new meaning for 'features' (the minItems 1 / maxItems 3 constraint) or the name/description fields.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb ('scores rejection risk') and resource (App Store Guidelines 4.2, 4.3, metadata) plus the exact input domain (Capacitor, WebView, PWA-shell, React Native, AI-generated iOS apps). No sibling tool overlaps this namespace, so the agent can route here unambiguously.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Clearly scopes when the tool applies by enumerating the app stacks and origin types it targets, which doubles as the trigger condition for calling it. It does not state when not to use it or name alternatives, but none of the siblings are plausible substitutes.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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