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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false; the description usefully reinforces this by stating it "opens nothing by itself" and that the actual write happens through separate cotlet_browser_* tools. It also discloses that no public API exists, which shapes the agent's plan. It does not describe the format of the returned steps or what happens if the user is not signed in to CoachingPortal.

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 purpose and the no-side-effect clarification are front-loaded, which is good. However, the final clause ("CoachingPortal's official API: CoachingPortal publishes no public API") is redundantly worded and repeats the product name twice, and the workflow sentence is dense enough to require re-reading.

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-output-schema tool the description supplies the essentials: what it returns (screens/buttons/fields steps), that it performs no mutation, and which tools complete the job. The one gap is that the referenced cotlet_browser_* tools are not in this server's sibling list, so the agent must discover them elsewhere.

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 input schema has zero parameters, so there is nothing for the description to disambiguate and the baseline applies. The description correctly implies no inputs are needed from the caller.

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 states the resource (a CoachingPortal progress story) and then clarifies the actual mechanism: it returns step-by-step instructions rather than performing the creation. That resolves the tension between the imperative name and the real behavior. It does not differentiate from siblings such as coachingportal_add_progress_entry or coachingportal_log_personal_progress, which sound adjacent.

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 gives clear downstream workflow guidance ("then do it with the cotlet_browser_* tools in the user's CoachingPortal Cloud Browser"), which tells the agent this is a first step in a chain, not the final action. It gives no when-to-use-vs-sibling guidance, so an agent choosing between creating a progress story, adding a progress entry, or logging personal progress must infer.

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