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

With readOnlyHint, idempotentHint and destructiveHint=false already declared, the description still adds real value by stating it "opens nothing by itself" and requires a separate browser tool to actually execute. The note that no public Gymdesk API exists explains why browser automation is required, which is useful context. However, it does not describe what the returned steps look like in structure or how they should be validated before executing, leaving a modest gap for a mutation-adjacent workflow.

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 "does not act, only instructs" caveat are front-loaded, and the API-absence note explains the browser dependency rather than padding. The API/404 investigation detail is somewhat verbose and dated, and could be compressed to a single clause without losing meaning.

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, no-output-schema instruction tool, the definition covers what is returned (screens, buttons, fields) and what to do next, which is sufficient to invoke it correctly. It stops short of describing preconditions — e.g., required permissions or what happens if the competition is already endorsed — which would be needed for fully confident use.

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 no parameters (baseline 4), and the schema with additionalProperties=false fully documents that. The description adds no parameter meaning beyond the schema, but there is nothing to add; the minor deduction reflects that the scope of the operation (which competition? whose account?) is only loosely pinned down by the prose — presumably resolved in the browser step.

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 ("Endorse competition in the user's own Gymdesk account") and, crucially, clarifies that the tool does not perform the action itself but returns step-by-step instructions. It does not explicitly contrast itself with sibling competition tools such as gymdesk_register_or_invite_member_to_competition, and what "endorse" means in Gymdesk terms is left implicit, but an agent can tell this is an advisory/instruction tool rather than a mutator.

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 prescribes the workflow clearly: call this tool first, then carry out the steps with cotlet_browser_* tools in the user's Gymdesk Cloud Browser. What is missing is when NOT to use it — e.g., when a direct API-backed sibling tool could accomplish the same outcome — so the agent must infer that this is the fallback path.

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