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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered; the description still adds real value by confirming nothing is opened, that the output is procedural guidance rather than data, that a Cloud Browser session is required, and that EstimateOne's External API is read-only and not self-service. That API note usefully discourages an agent from trying a dead-end route. Minor noise: the parenthetical '(checked 6 Nov 2026)' is a future-dated, unverifiable detail.

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?

Front-loaded with the key behavior correction ('returns how to do it... opens nothing by itself') in the first sentence, which is exactly what an agent needs before acting. The trailing API aside is justified because it prevents an incorrect routing decision, though the parenthetical date clause could be trimmed.

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, non-destructive guidance tool with no output schema, the definition covers what it returns, what it does not do, the required follow-up tooling and environment, and an alternative-API caveat. Nothing an agent needs in order to call it and continue the workflow correctly is missing.

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, which is the baseline-4 case and the schema is fully self-describing. The one gap is that with no parameters it is never explained how the target project or account is determined (presumably from the Cloud Browser session/current page); the description says 'in the user's own EstimateOne account' but not what identifies the project.

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?

States the resource (EstimateOne project package) and immediately discloses the actual behavior: it returns step-by-step instructions (screens, buttons, fields) and 'opens nothing by itself.' That clarification is essential because the name 'download_project_package' implies an action it does not perform. It also names the sibling family (cotlet_browser_*) needed to complete the task, so an agent can distinguish it from an executor.

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?

Gives a clear two-step usage pattern: call this to get instructions, then act via cotlet_browser_* in the user's Cloud Browser. However, it never contrasts with the plausible sibling estimateone_request_project_package or cotlet_browser_download, and gives no explicit when-not-to-use condition. Usage is implied rather than disambiguated.

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