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

No annotations are provided, so the description carries the burden. It discloses the key behavioral trait that this is a fallback for data the API doesn't surface and that the output is a browser-openable URL, but it says nothing about auth requirements or what happens on failure.

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, zero waste, with the scope and the sibling reference front-loaded before the usage guidance. Nothing could be cut without losing routing 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 single-optional-parameter read tool with full schema coverage and no output schema, the description is nearly complete: it explains what is returned (two URL types) and the fallback scenario. A note on what the tool returns when no thread exists would close the remaining gap.

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 optional parameter, and schema description coverage is 100%, so the schema already documents notification_message fully. The description adds no meaning beyond it — notably it never explains that the parameter is a reply-failure fallback message, which is non-obvious from the tool itself.

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 and resource (get the Resolution Center and App Review URLs) and immediately scopes it to messages Apple has not exposed via list_review_messages, which distinguishes it from the closest sibling. An agent can distinguish it from list_review_messages without opening either schema.

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?

Explicitly states the trigger: 'Use when an operator needs to open the review thread directly in a browser,' and the clause about messages not exposed via list_review_messages functions as an implicit exclusion routing the agent to the sibling first. No further exclusions or prerequisites are given, but the situation is clear.

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