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

With no annotations, the description carries the full behavioral burden. It does disclose two useful traits beyond the schema: the two-letter storefront format and the free-tier cap of one tracked app. However, it says nothing about what happens when an app is already tracked (idempotency/duplication), what data is fetched, or what the response contains.

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, front-loaded sentences with no filler; the core action comes first, followed by the two constraints an agent most needs. Every sentence earns its place given the 0% schema coverage.

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?

For a simple two-parameter tool with no output schema this is close to adequate, covering purpose, format, and a quota limit. It still omits the side-effect/duplicate behavior and any auth expectation, which matters because there are no annotations to cover them.

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 compensate. It adds real meaning for 'country' ('a two-letter storefront') beyond the regex pattern, but 'appId' is never explained and its numeric-string nature is only implied by the pattern. Partial compensation justifies a middle score.

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 states a specific verb and resource ('Track an App Store app') and adds scope ('in one country'), so an agent can distinguish it from add_tracked_keywords. It does not explicitly name any sibling or contrast itself with list_tracked_apps, so it falls short of a 5.

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?

There is no when-to-use guidance, no mention of prerequisites (e.g., that an account is required) beyond the passing 'a free account can track one app' limit, and no routing to alternatives such as add_tracked_keywords. The usage context is only implied.

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