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

With readOnlyHint=true already declared, the description usefully confirms the safety profile by explaining this call opens nothing and only returns step-by-step screens/buttons/fields. That is real added context beyond the annotations. Against that, the trailing "official API: Yes..." sentence is unrelated trivia that doesn't describe this tool's behavior and could mislead an agent into thinking a REST path is used, diluting the useful disclosure.

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?

Three sentences, one of which (the API availability note with a checked date) earns no place in a tool description, and the opening sentence duplicates the title rather than informing. The genuinely load-bearing content — 'returns step-by-step instructions, does nothing itself, then use cotlet_browser_*' — is buried mid-paragraph instead of front-loaded.

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 guide tool with no output schema, the description does cover what comes back (screens, buttons, fields) and the follow-on action, which are the essentials. It omits the operating preconditions (browser already opened via cotlet_browser_open, user signed in) and any hint about response size/shape, which an agent needs before deciding to call 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 0 parameters and the schema is empty, so there is no parameter meaning to add; the baseline for a zero-param tool is 4. The description correctly doesn't invent inputs such as a date or wellness values, which is consistent with the empty schema.

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 first sentence restates the title verbatim ("Log daily wellness in the user's own Intervals.icu account"), and only the second sentence reveals the tool's real behavior: it "Returns how to do it in Intervals.icu step by step (screens, buttons, fields) and opens nothing by itself." Once read in full the purpose is understandable (a how-to guide, not a writer), but the headline verb "Log" points at the opposite action, so an agent skimming the name and first line would mis-select it against intervals_icu_list_wellness.

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?

The description supplies a clear next step — "then do it with the cotlet_browser_* tools in the user's Intervals.icu Cloud Browser" — which is useful routing to the sibling tool family. However, it never states prerequisites (an open Cloud Browser session, an authenticated Intervals.icu login) nor when NOT to use it, or how it relates to list/other wellness tools, so the guidance is implied rather than explicit.

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