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

With readOnlyHint, idempotentHint and destructiveHint=false already supplied, the description adds genuinely non-obvious behavior: the call performs no action and returns procedural guidance rather than data, which matters because there is no output schema. The API pricing note also discloses that no direct API path is assumed, reinforcing why the browser route is required.

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 purpose and handoff are front-loaded and efficient, but the trailing API add-on paragraph—including a verbatim price quote and a 'checked 11 Nov 2026' date—consumes roughly a third of the text for context that could be one clause. It earns partial credit as justification for the browser approach, but it is bulky.

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, read-only tool with no output schema and strong annotations, the description covers what is needed: what it returns, that it performs nothing, and which tool family executes the action. Only the return format's size or structure (e.g., whether it is a fixed checklist) is left unspecified, which is minor.

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; there is nothing for the description to disambiguate. It correctly implies the call is parameter-free by describing an account-scoped action with no inputs.

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 specific verb and resource ('View the Schedule calendar in the user's own Exercise.com account') and immediately clarifies what the tool actually produces: step-by-step instructions with screens, buttons and fields. That framing separates it from the sibling that creates sessions and events on the same calendar.

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?

Gives an explicit workflow: this tool 'opens nothing by itself,' then the agent should act 'with the cotlet_browser_* tools in the user's Exercise.com Cloud Browser.' That tells the agent when to call it and what to do next, though it names no sibling alternative or exclusion beyond the browser handoff.

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