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

The description is consistent with the readOnlyHint=true and destructiveHint=false annotations: it explicitly says the tool "opens nothing by itself" and only returns written guidance, which is exactly the kind of behavioral disclosure that matters for a misleadingly named tool. Beyond that it adds little, and the trailing claim about Uscreen's Publisher API is background trivia that does not affect a call decision.

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 generic audience phrase "from ChatGPT, Claude or any AI agent" is filler, and the API-availability sentence with a dated verification stamp is longer than its decision value warrants. The single most important fact — that the tool returns instructions and performs no action — sits mid-sentence rather than being front-loaded.

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, non-mutating tool with annotations and no output schema, the description covers what an agent needs: it states the return content (screens, buttons, fields), confirms no side effects, and points to the browser tools that carry out the work. Missing only the session prerequisite and the relationship to the other upload siblings.

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 no schema meaning to supplement; baseline 4 applies. The description also correctly implies no inputs are required, avoiding any suggestion that a file or account parameter must be supplied.

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 a specific verb and resource ("Upload video in the user's own Uscreen account") and then immediately clarifies the actual behavior: it returns a step-by-step how-to rather than performing the upload. That correction is essential and well placed, though the tool name still implies an action the tool does not take.

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 a follow-on workflow ("then do it with the cotlet_browser_* tools in the user's Uscreen Cloud Browser"), which tells the agent how to chain this tool. However, it never distinguishes itself from the sibling upload tools (cotlet_upload_file, cotlet_browser_upload), which are the most likely sources of misselection, and it states no preconditions such as an already-open Cloud Browser session.

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