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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, and the description reinforces this with 'opens nothing by itself', which prevents an agent from assuming a side effect. It adds real context beyond the annotations — the return shape (screens, buttons, fields) and the fact that GlossGenius has no public API, webhooks or MCP server, explaining why browser automation is required. Minor gap: no mention of latency or what happens if the user is not authenticated in the Cloud Browser.

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 operative information (what it returns, that it acts on nothing, and the follow-up browser tools) is front-loaded in the first two sentences. The trailing API-availability sentence is justified context but is slightly long and includes a dated verification stamp that adds words without adding decision value.

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 parameters, no output schema and low complexity, the description carries everything an agent needs: the return format, the no-side-effect guarantee, and the required next step. Nothing essential is missing for correct invocation.

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 and the description correctly describes it as a parameterless guide, so there is no ambiguity to resolve. Baseline of 4 applies for a 0-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?

The description gives a specific verb+resource ('Reschedule appointment in ... GlossGenius') and immediately clarifies the tool's actual nature: it returns step-by-step instructions rather than performing the change. That distinction from the cotlet_browser_* siblings is made explicit, so an agent can route without opening a schema.

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 clearly states the workflow split — call this to get the steps, then execute them with the cotlet_browser_* tools in the Cloud Browser. It does not, however, contrast itself with glossgenius_book_appointment or cotlet_app_guide, so an agent must infer which is right for a new booking versus a reschedule.

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