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 adds genuinely new context: the tool is advisory ('opens nothing by itself') and returns a procedural guide rather than data, which is exactly the kind of behavioral fact an agent cannot infer from the schema. It stops short of describing length or structure of the returned guide.

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?

Three compact sentences that front-load the action and then the caveat, with no filler. The phrasing is slightly awkward ('Returns how to do it in TrueCoach step by step ... and opens nothing by itself'), but nothing is redundant and no sentence is wasted.

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, no output schema and full annotation coverage, the description carries the burden of explaining the return value, and it does: a step-by-step walkthrough of screens, buttons and fields. The added note that TrueCoach has no public API explains why the guide approach exists. Only the exact shape/length of the returned guide is unstated, which is minor.

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 and the baseline of 4 applies. No parameter meaning is lost or left implicit.

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 ('Read workout results in the user's own TrueCoach account') and then clarifies the actual deliverable: step-by-step instructions with screens, buttons and fields. There is a mild tension between the name (which suggests it fetches results) and the stated behavior (it returns a how-to), but a reader can still tell what comes back and how it differs from the cotlet_browser_* execution tools.

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 routes the agent: call this first to get the procedure, then perform it with the cotlet_browser_* tools in the TrueCoach Cloud Browser. It also notes the tool opens nothing itself, which prevents a misuse. It does not name a when-not condition or a specific single browser tool, but the sequencing guidance is clear.

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