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

Beyond readOnlyHint/idempotentHint it adds two substantive facts: the tool 'opens nothing by itself' and it returns procedural guidance (screens, buttons, fields) rather than data. It also explains the reason the browser tools are required – CoachingPortal publishes no public API – which is real context an agent cannot infer from annotations. It does not describe the shape or limits of the returned instructions, keeping it off a 5.

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?

It is front-loaded and reasonably short, and the core workflow (get steps, then act via browser tools) is stated early. However, the closing clause 'CoachingPortal's official API: CoachingPortal publishes no public API.' is awkwardly phrased, reads like a fragment, and restates the dependency already established earlier.

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 guidance tool with no output schema, the description covers what an agent needs: what is returned (step-by-step instructions), that nothing is executed, and which tool family performs the actual work. Only the granularity/limits of the returned steps are left unspecified, which is a minor gap.

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 nothing for the description to disambiguate; baseline 4 applies. The schema's empty object with additionalProperties=false is self-explanatory, though the description does not explicitly say the call is parameterless.

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 the resource (self coaching plan in the user's own CoachingPortal account) but the verb is 'manage', which spans create/edit/delete/view and does not pin down a concrete operation. What the tool actually produces is clear – step-by-step CoachingPortal instructions with screens, buttons and fields – but the action itself remains generic, and no distinction is drawn from the close sibling coachingportal_manage_self_coaching_habits.

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 implies the usage pattern: call this to learn the CoachingPortal steps, then perform them with cotlet_browser_* tools in the Cloud Browser. That is useful routing guidance, but there are no explicit when-not conditions and no statement of how to choose between this and the other 'manage_self_coaching_*' tools.

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