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

Goes well beyond readOnlyHint/openWorldHint by disclosing what is returned (claim link, expiry, already-claimed flag) and what the link actually does for the user ('a free sign-up or log-in that moves the studio's games into their own account'). That is the key behavioral fact an agent needs to explain or hand off the link.

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?

Front-loaded with the premise and then the return payload, then the sibling routing. The parenthetical explaining sign-up/log-in is slightly long but carries real meaning, so only minor trimming is possible.

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?

No output schema exists, and the description compensates by naming the three return fields and their meaning, plus the prerequisite state (unclaimed studio with no account). Nothing an agent needs in order to call it or act on the result is missing.

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?

There are zero parameters, so there is nothing to disambiguate; baseline 4 applies. The description correctly does not waste space on parameter talk.

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?

States a specific verb and resource ('Returns the claim link' for an 'unclaimed studio') and explains the underlying model in one clause ('This connection has no account: it builds into an unclaimed studio'). An agent can distinguish this from connect_account purely from the description.

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?

Explicitly routes between alternatives: 'connect_account is the better way to keep the games when the user is here... the claim link is for later, or for someone else.' Both the use case and the exclusion are named, with the reason (session keeps working as their account).

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