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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, and the description is consistent with them rather than contradicting them. Beyond the annotations it adds genuinely useful context: nothing is opened or mutated by the call, the return is procedural steps naming screens, buttons and fields, and the reason a browser automation path is required (no public CoachingPortal API). It does not describe result volume or failure modes if the user lacks the announcements screen.

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, front-loaded with the core behavior and the critical "opens nothing by itself" caveat early. The clause "from ChatGPT, Claude or any AI agent" is filler that does not help an agent decide or invoke. The final API note earns its place because it justifies the browser-tool handoff.

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 output schema, the description correctly compensates by saying the return is step-by-step screens/buttons/fields, and annotations cover the safety profile. However, a zero-parameter "dismiss" tool leaves open what happens when multiple announcements exist — whether the steps are generic navigation or scoped to a particular item — and the description is silent on that. Adequate, but a real ambiguity remains.

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 schema takes zero parameters, so there are no parameter semantics for the description to explain; baseline 4 applies. The description appropriately spends no space on parameters. It also does not note that with no inputs the returned steps must be generic rather than tied to one specific announcement, which would have been a useful clarification.

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 (dismiss an announcement) and scopes it to "the user's own CoachingPortal account," which distinguishes it from admin/workspace-wide siblings like coachingportal_publish_announcement. It also corrects the misleading action-sounding name by stating the tool "Returns how to do it in CoachingPortal step by step" rather than performing the dismissal. The opening clause still reads momentarily like a direct action, which keeps it short of a 5.

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 explicit execution guidance: this tool only returns instructions, and the actual dismissal must be carried out "with the cotlet_browser_* tools in the user's CoachingPortal Cloud Browser." That is a clear use-two-steps workflow an agent can follow. It stops short of naming when NOT to use it or pointing at any alternative within this server.

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