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

Annotations already cover safety (readOnlyHint) and open-world access, and the description adds genuinely new context: quota consumption ('Counts toward the research quota') and graceful handling of unknown IDs. It does not mention error behavior or batching partial failures, so it stops short of 5.

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?

Three short sentences, front-loaded with what is returned, then batching, then the quota cost. No filler and every clause conveys information.

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?

No output schema exists, and the description compensates by listing the returned fields, plus batch limit, omission behavior, and quota cost. The one omission is the undocumented 'store' parameter, which an agent must discover from the schema alone.

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 description coverage is 0%, so the description must carry parameter meaning. It clarifies appStoreIds as App Store IDs with a 50-item cap, but says nothing about the 'store' country-code parameter (default 'us') or the numeric ID format, leaving a real gap for a 2-parameter tool.

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?

Names a specific verb/resource ('App Store details') and enumerates the returned fields (developer, rating, price, description, screenshots), plus the batch scope of up to 50 IDs. This distinguishes it from search_app_store and list_apps by implication, though no sibling is named explicitly.

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?

Usage is only implied: an agent can infer this is the detail-fetch step after a search or listing, but the description never states when to use it versus search_app_store, list_apps, or add_app. The omission note ('IDs not available in the store are omitted') is a behavior fact rather than usage guidance.

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