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

The annotations already declare readOnlyHint=true and destructiveHint=false, and the description reinforces this with the explicit disclosure that it 'opens nothing by itself.' It adds real value beyond annotations by describing the return content (screens, buttons, fields) and noting the absence of a self-serve API key. No contradiction with annotations; it strengthens them.

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?

The critical caveat ('opens nothing by itself') is front-loaded early, which prevents the agent from assuming an action occurs. The three sentences are dense but mostly earn their place; the trailing API-key note is slightly tangential but useful for steering the agent away from API onboarding attempts.

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 zero-parameter, no-output-schema guidance tool, the description covers what it returns and how to follow up with cotlet_browser_* tools. The read-only nature is covered by both annotations and text. Nothing essential for calling it correctly is missing.

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?

The tool takes zero parameters, so the baseline is 4. The description is consistent with the empty schema and adds no misleading parameter expectations. Nothing further is required for a no-arg tool.

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+resource ('Buy online retail in the user's own Paired Plus account') and immediately corrects the misleading name by clarifying it returns step-by-step instructions rather than performing the purchase. It distinguishes itself from actual transaction tools by naming the cotlet_browser_* workflow. It doesn't explicitly differentiate from siblings like paired_plus_checkout_sale, but the retail-buying scope is clear.

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?

It gives workflow context ('Returns how to do it... then do it with the cotlet_browser_* tools in the user's Paired Plus Cloud Browser'), which tells the agent what to do after calling. However, there is no explicit statement of when to choose this over other Paired Plus purchase/checkout siblings, and no when-not guidance. Usage is implied rather than framed as a decision rule.

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