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app-store-connect-mcp

app-store-connect-mcp

by devinwang
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TypeScript
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background_assets_create_instance

Create a background asset for an App Store Connect app via the /v1/backgroundAssets endpoint, using the required JSON:API request body.

Instructions

POST /v1/backgroundAssets (POST /v1/backgroundAssets) Body shape: see OpenAPI components.schemas.BackgroundAssetCreateRequest for the full JSON:API envelope.

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": {
      "body": "<body>"
    },
    "name": "background_assets_create_instance"
  }
}

Input Schema

NameRequiredDescriptionDefault
bodyYesJSON body. Shape: components.schemas.BackgroundAssetCreateRequest.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.5.0

TDQS

C2.2/5.0
Behavior2/5

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

With no annotations, the description carries the full burden for what is clearly a mutating POST. It states the endpoint and body envelope but discloses nothing about auth/permissions, idempotency, side effects, or rate limits. The JSON:API envelope reference is the only behavioral hint.

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

Conciseness2/5

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

It is short, but it wastes its only sentence by repeating the same endpoint twice ('POST /v1/backgroundAssets (POST /v1/backgroundAssets)'). The parenthetical duplication is pure noise and the sentence is not front-loaded with anything useful.

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

Completeness2/5

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

For a mutating create tool with no annotations and no output schema, the description is far too thin. The sole parameter is a black-box object that defers to an external OpenAPI schema, and no return behavior or creation semantics are given, leaving the agent unable to call this correctly without outside knowledge.

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% for the single body parameter, so the baseline is 3 even though the description adds nothing beyond what the schema says. Both the description and the schema merely point outward to components.schemas.BackgroundAssetCreateRequest, so no field-level meaning is conveyed.

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

Purpose2/5

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

The description is essentially a restatement of the tool name and HTTP verb: 'POST /v1/backgroundAssets' adds the endpoint path but nothing about what a background asset is or what creating one accomplishes. It does not distinguish this create operation from siblings like background_assets_update_instance or background_asset_versions_create_instance beyond the implied verb.

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

Usage Guidelines2/5

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

There is no guidance on when to use this tool versus the update/get siblings, no prerequisites, and no mention of what state must exist first. The agent is left to infer everything from the name.

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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