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

Beyond the annotations, it discloses the return content (step-by-step screens, buttons, fields) and a key safety trait: "opens nothing by itself", meaning no session or page is mutated. This is useful context that annotations alone (readOnlyHint, idempotentHint, destructiveHint=false) do not convey. It does not describe output format details such as length or structure, but the important behavioral facts are stated.

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 core message lands early, but the opening clause "from ChatGPT, Claude or any AI agent" is filler, and the trailing sentence "Powered Now's official API: Powered Now publishes no public API docs" is awkwardly constructed and restated. The useful sequencing (get the steps, then drive the browser) survives, but sentences could be tightened.

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 tool, the definition covers what matters: what it returns, that it performs no action, and which tool family carries out the work afterward. The only gap is that it does not say what to do if the returned steps are insufficient, but nothing essential to invoking it 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 no parameters, so there is nothing for the description to disambiguate; the schema is an empty object with additionalProperties=false and 100% coverage. No parameter claims in the description conflict with the schema. Baseline of 4 applies for a zero-parameter 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?

States a specific verb and resource ("List unpaid invoices in the user's own Powered Now account") and then clarifies the actual mechanism: it returns step-by-step screens/buttons/fields rather than performing the listing itself. That clarification is necessary because the name implies an executed read; without it an agent would misread the tool. It stops short of naming a specific alternative for the actual retrieval.

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 clear next-step routing: use this first for the procedure, then "do it with the cotlet_browser_* tools in the user's Powered Now Cloud Browser". It also excludes an implied alternative by noting Powered Now has no public API docs, which explains why browsing is required. No explicit when-not condition is offered, so it is clear but not exhaustive.

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