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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, and the description reinforces rather than contradicts them with 'opens nothing by itself'. It adds genuinely non-obvious context beyond annotations: the return value is a screen/button/field walkthrough, and no public API exists so a browser tool is required. It omits failure modes, such as what happens if the user is not signed in.

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 is front-loaded and the key operational sequence (returns steps, opens nothing, then use cotlet_browser_*) is easy to extract. Some wording is loose, notably the redundant 'CoachingPortal's official API: CoachingPortal publishes no public API' and the filler 'from ChatGPT, Claude or any AI agent'.

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, read-only guidance tool with annotations and no output schema, the description covers what it does, what it returns, that it has no side effects, and what to do next. The one unaddressed point is how the target workout is identified given there are no parameters, which an agent may wonder about even though the guided browser flow presumably resolves it.

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 the baseline is 4 and there is no argument meaning for the description to add. Schema coverage is 100% and additionalProperties is false, leaving nothing ambiguous.

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 a specific verb and resource (create a workout share image) and then immediately corrects the likely misreading by explaining that the tool returns step-by-step CoachingPortal instructions rather than performing the action. It does not explicitly contrast itself with near neighbors such as coachingportal_share_meal_plan or coachingportal_share_program, so an agent must infer that those follow a similar pattern.

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 an explicit usage path: call this for guidance, then execute with the cotlet_browser_* tools in the user's Cloud Browser. That is clear routing to an alternative toolset. It stops short of stating when not to use it, e.g. if the user simply wants a share link or already has the browser flow open.

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