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

Annotations already declare readOnlyHint, idempotentHint, no destructive and no open-world behavior. The description adds useful context beyond them: the tool 'opens nothing by itself' and returns procedural guidance (screens/buttons/fields), plus the rationale that My PT Hub publishes no public API, explaining why browser tools are required. That is genuine added behavioral context, though return format details remain thin.

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 message is front-loaded, but the wording is clunky and repetitive—'from ChatGPT, Claude or any AI agent' is filler, and 'My PT Hub's official API: My PT Hub publishes no public API' repeats the product name three times for what amounts to one point. It is understandable but not tightly edited.

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 low-complexity 0-param guide tool with no output schema, the description covers what it returns (step-by-step screens/buttons/fields), that it opens nothing, and the required follow-up tools. It does not describe the exact shape of the returned guide, but otherwise an agent has what it needs to invoke it correctly.

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 and the schema coverage is 100%, so there is no per-parameter meaning to add. The baseline of 4 applies for a 0-param tool.

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 states a specific resource and verb (list clients in the user's own My PT Hub account) and importantly clarifies that the tool returns a step-by-step guide (screens, buttons, fields) rather than performing the action itself. This distinguishes it from a data-returning tool. The opening 'List clients' framing is slightly misleading given the tool actually emits instructions, keeping it from a 5.

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 tells the agent the follow-up path: use the cotlet_browser_* tools in the My PT Hub Cloud Browser to actually perform the task after getting the guide. This establishes when to use this tool vs the browser tools. It stops short of naming other guide-style siblings or exclusions, so it's clear but not exhaustive.

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