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

Annotations already declare readOnlyHint=true and destructiveHint=false, and the description reinforces this usefully with 'opens nothing by itself', telling the agent no state changes occur server-side. It also discloses the shape of the response (step-by-step screens, buttons, fields), which compensates for the absence of an output schema. The closing note about Fitatu having no public API is interesting but not behaviorally actionable.

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?

It is short and front-loads what the tool returns and what it does not do. Minor waste exists in the marketing-flavored 'from ChatGPT, Claude or any AI agent' clause and the dated 'checked 13 Oct 2026' parenthetical, which do not help an agent decide or invoke.

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, non-mutating guide tool with no output schema, the description supplies everything needed: what comes back, that nothing is opened automatically, and which tools to use next. The only gap is whether a Fitatu Cloud Browser session must already be open before calling it.

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 there is nothing for the description to disambiguate; the baseline applies. The description correctly implies no inputs are needed to retrieve the walkthrough.

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 makes the key correction that the tool returns step-by-step instructions (screens, buttons, fields) rather than diary data, which resolves the ambiguity created by the 'get_diary' name. It does not, however, distinguish itself from cotlet_app_guide, which on its name alone sounds like a comparable guide tool.

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 a clear follow-on path: fetch the steps here, then execute them with the cotlet_browser_* tools in the user's Fitatu Cloud Browser. What is missing is any exclusion or routing rule against siblings such as fitatu_get_nutrition_summary or cotlet_app_guide, so the agent must infer when this guide is the right entry point.

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