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

The annotations already declare readOnly, non-destructive, idempotent and closed-world, and the description is consistent with them by saying it 'opens nothing by itself'. It adds useful return-value context (step-by-step screens, buttons, fields) despite no output schema, but the API research note is about the external product's API availability rather than about this tool's runtime behavior, permissions, or limits.

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?

Purpose and the 'opens nothing by itself' caveat are front-loaded, which is good. The trailing sentence about the vendor's 404 pages, FAQ and QuickBooks integration is dense, dated detail that is tangential to invoking this tool and dilutes the core instruction.

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, read-only guidance tool with no output schema, the description covers what is returned and what to do with it. It leaves a gap on how the actual location data gets conveyed (presumably through the browser tools) and does not say what the step-by-step output looks like or how complete it is.

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 the schema baseline of 4 applies and there is nothing parameter-wise the description needs to explain. The description does not, however, note that location details must be supplied later through the browser tools rather than through this call.

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 verb and resource ('Add Location in the user's own EZ Lawn Biller account') and, crucially, corrects the implication of the name by saying it 'Returns how to do it ... step by step' and 'opens nothing by itself'. That makes it distinguishable from real mutating siblings, though it never names a specific sibling for comparison.

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 what to do next ('then do it with the cotlet_browser_* tools in the user's ... Cloud Browser'), which is genuine routing guidance. But there are no explicit when-not-to-use conditions and no named alternative among the many add_* siblings, so the agent must infer that this tool is for guidance rather than for listing or creating.

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