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

Annotations declare this is a non-read-only, open-world, non-destructive write, and the description usefully adds that it fetches a public listing and enumerates exactly which fields are read (name, subtitle, rating, reviews count, languages, screenshots). It also discloses cost ("Free"). It does not state idempotency or auth/permission requirements, keeping it short of a 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?

Two sentences, front-loaded with the action, each carrying distinct information (source, fields read, cost). No filler or restated title.

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 no output schema, the description compensates by telling the agent what the listing read returns. For a single-parameter add tool with annotations covering the safety profile, this is nearly complete, though it could clarify what the tool itself returns after adding.

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?

Only one parameter, and the schema already documents it at 100% coverage. The description nonetheless adds the concrete URL shape ("apps.apple.com/.../id123"), giving a usable format example beyond the schema's generic "apps.apple.com link".

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 ("Add the founder's iOS app to this workspace") plus the input source (App Store link) and the data that will be pulled. This is clearly distinguishable from sibling listing/read tools, but it never names an alternative to contrast against, so it stops short of the top mark.

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 implied by "Add the founder's iOS app to this workspace" — an agent can infer this is the first-time add step. However, there is no explicit when-to-use vs siblings (app_metadata, app_audit, app_downloads) and no prerequisites or exclusions stated.

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