Create AdMob app

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

The description discloses the required OAuth scope (admob.monetization), which is useful beyond the annotation readOnlyHint=false. It also implies the write nature of the operation. It doesn't describe side effects like visibility of the created app, but the annotation plus scope note provide adequate transparency.

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

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

Two clear sentences, front-loaded with the main action, then a concise explanation of the two usage modes. No redundant information or fluff.

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

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

Given the tool's moderate complexity, the description covers purpose, usage modes, and auth scope. It lacks an explicit mention of return value, but output schema is absent and for a create operation this is generally understood. The description is complete enough for the agent to select and invoke it correctly.

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

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

Schema coverage is 100% with descriptions for all three parameters. The description adds semantic value by explaining the relationship between appStoreId and displayName (linking a published listing vs registering an unpublished app), which goes beyond the schema's individual parameter descriptions.

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

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

The description clearly states 'Creates an app in the AdMob account' with a specific verb and resource, and it distinguishes the tool from siblings like create_ad_unit or list_apps by focusing on app creation. The two modes (appStoreId vs displayName) further clarify the exact purpose.

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

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

Provides clear guidance on when to use appStoreId (published apps) versus displayName (unpublished apps). While it doesn't explicitly exclude alternatives, the tool's purpose is distinct and the parameter guidance effectively tells the agent which mode to choose based on the app's status.

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