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

Beyond readOnly/openWorld annotations, it discloses the external fetch (a live page of the site), the plan gate, and the shape of the response including that 'next' names the first remaining action. That is real behavioral context an agent cannot get from the annotations alone, and nothing conflicts with 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?

Purpose is front-loaded and every clause carries information, but the middle sentence is long and stacked with parentheticals ('the one tool that shows test sales'), which slows scanning. Slightly tighter phrasing would earn a 5.

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 still tells the agent what comes back: per-check sentences plus a 'next' item naming the first remaining step. Combined with the plan prerequisite and the two run-timing triggers, an agent has everything needed to invoke it correctly.

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 coverage is 100% for the single optional url parameter, so the baseline is 3. The description earns one extra point by explaining the default ('the business website unless url is given') and framing why you would target a specific page, e.g. a pricing page where the tag must be present.

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 ('Check that affiliate tracking works') and then spells out the mechanism: fetches a page, looks for the account tag, and reports on script execution, payment-platform connection and test-purchase arrival. It also carves itself out from siblings by noting it is 'the one tool that shows test sales', which separates it from get_setup_status and get_tracking_instructions.

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 explicit triggers: run it after the script is deployed, and again after the person buys once in test mode through an affiliate link. It also states the eligibility condition (Pro plan or higher, or a new account without a plan), so an agent knows when the call is appropriate and when it will be rejected.

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