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

With annotations already declaring a non-read-only, destructive tool, the description still adds real context: PII is collected and stored, the customer may be contacted, expansion runs a detailed analysis server-side, and the output is a preliminary estimate rather than a contractual offer. The one gap is the destructiveHint itself — it never says that re-calling replaces or wipes the previously saved plan, which is exactly the risk an agent needs to know about.

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 is front-loaded in the first sentence and each subsequent sentence carries a distinct fact (input choice, status semantics, estimate caveat, consent, update behavior). Slightly repetitive in mentioning the required name/email twice, but 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?

For a 7-parameter mutating tool with no output schema, the description covers inputs, consent/privacy, the meaning of module statuses, and update behavior. It stops short of describing the returned plan's shape (price range format, module list) and the replace-on-rerun consequence, which are the remaining gaps.

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 coverage is 100%, so the schema already documents every parameter including the 'omit to keep saved value' semantics. The description usefully clarifies the either/or relationship between project_context_id and project_description and that name/email are required for the backend analysis, but otherwise restates schema content, so the baseline 3 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 first sentence states a specific verb and resource set (create a preliminary project plan, price range, effort estimate), and the second scopes the intent to understanding functional modules and open requirements. It is clearly distinguishable from book_consultation or send-feedback-tool, but it never names the closest-seeming siblings (analyze-request-tool, prepare-project-inquiry-tool) to draw the boundary explicitly.

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 concrete invocation conditions: provide an existing project_context_id or a project_description for a new project, and it states that re-calling the tool updates the plan. What's missing is any exclusion — nothing says when to prefer analyze-request-tool or prepare-project-inquiry-tool instead, so the agent must guess among overlapping planning/preparation siblings.

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