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

Annotations already declare readOnlyHint/idempotentHint true and destructiveHint false, so the safety profile is covered. The description adds genuinely useful context beyond that: this call performs no action itself ("opens nothing by itself"), it returns screen/button/field-level instructions, and it documents the absence of an official Portrait Care API, which explains why a browser-based flow 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 core behavior is front-loaded, which is good, but the final sentence about the missing API and the "checked 9 Nov 2026" citation is verbose and does not help the agent decide or invoke. The middle clause is dense but functional; trimming the provenance note would improve it.

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 is needed: what it returns, that it is side-effect free, and which tool family to use next. The only real gap is how the returned guide relates to the sibling action tools, but given the rich annotations and empty schema this is close to complete.

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 no parameter meaning to convey and the schema is necessarily complete. Nothing in the description contradicts or obscures the empty parameter set.

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 names a specific verb and resource ("List appointments") and then clarifies an unusual trait: it returns step-by-step instructions rather than data, and "opens nothing by itself." That distinction is essential and is stated plainly, though the name/title ("List appointments") and the actual behavior (return a how-to) are in mild tension, which costs a point.

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 sequencing guidance by telling the agent to perform the action afterwards with the cotlet_browser_* tools. However, it never states when to call this instead of siblings such as cotlet_app_guide or the other portrait_care_* actions, nor any when-not condition, so the agent must infer routing.

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