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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, and the description usefully reinforces this by stating it 'opens nothing by itself' — resolving the apparent conflict between the 'create' name and the read-only annotation. It also adds a genuinely useful external constraint (API key requires the Pro Team plan; Freedom and Pro exclude it). However, it does not describe pagination, latency, or what happens if the user has no Contractor+ account, leaving behavioral coverage moderate beyond the annotations.

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 sentences, front-loaded with the action and immediately followed by the critical clarification about what it returns. The API-plan sentence is longer than needed for the core task and includes an oddly specific parenthetical date, but it does carry decision-relevant information about why the API route is unavailable.

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 describing the return value and does so concretely ('step by step (screens, buttons, fields)'). Combined with the no-side-effect statement, the follow-up browser tool family, and the API availability caveat, an agent has everything needed to call it and act on the result.

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 is 4. The description correctly implies no input is needed and instead explains what comes back, which is the relevant semantic information for a no-arg 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 names a specific verb and resource ('Create estimate in the user's own Contractor+ account') and then immediately reframes what the tool actually does: it 'Returns how to do it in Contractor+ step by step (screens, buttons, fields) and opens nothing by itself.' That correction is essential and well placed, though the opening clause on its own reads like a performing action, which could momentarily mislead before the second sentence resolves it.

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 gives explicit follow-through guidance: after this tool, 'do it with the cotlet_browser_* tools in the user's Contractor+ Cloud Browser.' The API paragraph also functions as an alternative-path note, explaining why the official API is not the route for most plans. It stops short of naming sibling tools like contractor_plus_send_estimate or contractor_plus_create_job, so the agent has no stated boundary for adjacent Contractor+ operations.

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