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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description usefully adds that no UI is opened and that execution is delegated to browser tools, which is real value beyond the annotations. The closing sentence about Sleeper's 'limited API (checked 28 Oct 2026)' is opaque and adds no actionable behavior information.

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 behavior is front-loaded in the first two sentences, which is good. However, the third sentence about Sleeper's API status is unconnected to how to call the tool and reads as leftover boilerplate, and the opening clause about which AI clients can call it is wasted space.

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?

With no parameters and no output schema, the description needs to explain what comes back and what to do next, and it does: a step-by-step procedural answer plus delegation to browser tools. It is complete enough to call correctly, though it never indicates what inputs the guide covers (e.g. which league or channel the message targets).

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 there is nothing for the description to disambiguate at the schema level; baseline 4 applies. Nothing in the text conflicts with the empty input schema.

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 makes clear this is a guide-producing tool, not an executor: it 'returns how to do it in Sleeper step by step (screens, buttons, fields) and opens nothing by itself.' That corrects the misleading 'send' verb in the name and distinguishes it from the cotlet_browser_* siblings that actually perform the action. The opening clause about sending 'from ChatGPT, Claude or any AI agent' is marketing filler rather than purpose.

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 explicitly states the follow-up path: call this, then perform the steps with cotlet_browser_* tools in the user's Sleeper Cloud Browser. That gives clear usage context and a named alternative for the actual action. It stops short of stating when NOT to use it, e.g. whether a cotlet_app_guide call would be redundant.

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