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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the bar is lower, but the description still adds real behavior: it 'opens nothing by itself' and returns screens/buttons/fields rather than performing the update, and it tells the agent it must then drive the Cloud Browser. This is exactly the kind of clarification annotations cannot carry.

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 core instruction is front-loaded and useful, but the trailing sentence about the Publisher API ('in part', 'checked 11 Oct 2026') is long, tangential to invoking this tool, and its payoff for the agent is unclear. The sentence could be cut or compressed to a single clause.

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 and no parameters, so the description carries the whole burden, and it does explain what the return value is (step-by-step screens, buttons, fields) plus the required next step. Only the usability of the API footnote is left murky.

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, which sets a baseline of 4. The schema is empty and fully covered, so the description owes nothing further on parameter meaning.

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 ('Update collection in the user's own Uscreen account') and immediately reframes the tool as a guide that 'Returns how to do it in Uscreen step by step'. The dual framing (name says update, description says advisory only) is resolved by the description, so an agent can tell what it actually gets back.

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?

Gives a clear follow-on workflow: this tool returns the steps, then 'do it with the cotlet_browser_* tools in the user's Uscreen Cloud Browser'. That is explicit routing to the execution alternatives, though it never says when not to use it or how it differs from cotlet_app_guide.

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