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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds value beyond that by disclosing the authentication requirement (user's Cotlet API key with access to this app) and the approval-state semantics of the returned data, which the annotations do not convey.

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 opening clause and the second sentence substantially restate the same content ('title, total and client approval' / 'title, total and whether the client approved, declined or has not answered'). Front-loading is fine, but the redundancy costs it a point.

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 output schema, the description carries the burden of explaining return values and does so by naming the fields returned. Combined with the auth note and the workflow hint to create_invoice, an agent has enough to call it correctly, though pagination or result-size behavior is unaddressed.

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?

Schema description coverage is 100% and the single parameter project_id is documented in the schema as coming from list_projects. The description adds no syntax or format meaning beyond that, so the baseline 3 for a well-covered single-parameter schema applies.

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 action and resource (returns the estimates of one project) and enumerates the returned fields (title, total, client approval status), so the agent knows exactly what it retrieves. It does not explicitly differentiate itself from siblings like houzz-pro_create_estimate or houzz-pro_list_invoices, keeping it short of 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?

The phrase 'Pass estimate_id to create_invoice' gives a useful downstream workflow hint, and the project-scoping implies the tool is for viewing estimates of a known project. However, there is no explicit when-to-use vs when-not guidance or naming of alternative sibling tools.

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