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

Annotations already declare the safety profile (not read-only, not idempotent, open-world), and the description adds real value beyond them: it discloses the side effects (metadata fetched from the store, an initial visibility score computed, workspace linkage) and the plan app-cap cost. It stops short of addressing duplicate/repeat invocation behavior, which matters given idempotentHint=false.

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 the core action and followed by side effects and the quota constraint. No filler; every sentence carries 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?

For a 4-required-param tool with 100% schema coverage, full annotations, and no output schema, the description covers purpose, side effects, and cost adequately. The main gap is duplicate-handling/error behavior, which is relevant because the tool is explicitly non-idempotent and open-world.

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 100%, so the schema already carries full parameter meaning, including the detailed lang/country and store enum semantics. The description only reiterates 'store bundle ID', adding no syntax or format detail beyond the schema. 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?

States a precise verb and resource: 'Track a new mobile application by its store bundle ID.' It is clearly distinguishable from sibling add-tools that operate on different resources (add_competitor, add_note) and from read-side siblings like list_applications.

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?

The description implies the intended scenario (bringing a new app under tracking) and notes the plan-cap implication, but it never states when to prefer this over related tools such as check_metadata or list_applications, nor what happens if the app is already tracked. Usage is inferable but not explicit.

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