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

readOnlyHint=true already tells the agent this is a safe read, so the description's burden is lower. "With latest metrics" adds modest context about the payload, but nothing about whether only currently-tracked keywords are returned or how many.

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?

A single short phrase with no filler, front-loading the resource. It is efficient, though it verges on under-specification rather than crisp completeness.

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?

With one simple required parameter, full schema documentation and a read-only annotation, the essentials are covered. Still missing is any sense of the result shape (which metrics) or a pointer to list_apps for obtaining appId, which the description could cheaply have added.

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% and the appId field already documents "Local app id from list_apps, not the App Store ID". The description adds no parameter meaning beyond the schema, so the baseline 3 applies.

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 fragment names the resource (an app's tracked keywords) and adds a scope hint ("latest metrics"), which implicitly separates it from get_competitor_keywords and get_keyword_history. However, there is no verb and no explicit statement that this is a retrieval operation, so the agent must infer the action.

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 guidance on when to use this tool versus the many sibling keyword tools (get_competitor_keywords, get_keyword_history, get_keyword_suggestions, refresh_app_keywords). No prerequisites or exclusions are stated.

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