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

With no annotations provided, the description carries the full burden. It states the tool 'sends products to email address' but the schema reveals the email parameter is optional and that the file also returns in the API response when no email is given. This is misleading—the description implies email is mandatory. It also omits behavioral traits like the response format (Excel file) and any authentication requirements beyond the plan restriction.

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 description is concise, with two sentences front-loading the core purpose. It includes relevant business constraints (plan and billing) without unnecessary fluff. However, the emphasis on email might mislead the agent, and the structure could better separate the optional email behavior.

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?

Given there is no output schema and no annotations, the description should explain what the tool returns. It only mentions sending to email, omitting that the Excel file is also returned in the response when no email is specified. It doesn't address prerequisites like authentication, and the optionality of email is not conveyed. The description is insufficient for an agent to understand the full behavior and call this tool correctly.

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 input schema provides exhaustive descriptions for all four parameters (100% coverage). The description adds no parameter-level detail beyond what the schema already offers, so it meets the baseline but doesn't compensate for anything missing.

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 clearly states the tool sends products in Excel format to an email address, which distinguishes it from siblings like getProducts (which likely returns raw JSON). However, it doesn't explicitly mention that the API also returns the file in the response body, only focusing on email delivery. The plan restriction adds specificity but doesn't fully differentiate from similar product-fetching tools.

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 description mentions the $350/month plan requirement and per-call billing, which are constraints but not usage guidance. It does not explain when to prefer this tool over alternatives like getProducts or search, nor does it clarify that email is optional. No context is given about typical scenarios (e.g., bulk export vs. single product lookup).

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