Formal Letter Generator

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

Annotations provide only a title; no readOnlyHint or destructiveHint are present. The description discloses that placeholder values support markdown formatting, which is helpful, but it does not mention behavioral traits such as whether the tool creates a file, requires authentication, or has side effects. Given the lack of annotations, the description carries the full burden and is insufficient.

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 short (two sentences) and front-loaded with the purpose. The second sentence provides useful detail on markdown support. There is no wasted text, though the markdown examples could be more integrated for better flow. Still efficient and clear.

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?

The tool has one nested parameter with many fields, and an output schema is present (but not shown). The description does not specify the output format (e.g., plain text, HTML, file). This is a missing piece of context. However, the output schema likely covers return values. The description adequately covers the input and customization options.

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 has high description coverage (100%—each property has a description), so baseline is 3. The description adds value by explaining that placeholder values support markdown formatting (bold, italic, code, links, headings, lists). This enhances the understanding of how to use parameters like body, subject, and salutation beyond what the schema provides.

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 title 'Formal Letter Generator' and description clearly state the tool generates a formal business letter. The verb 'Generate' and resource 'formal business letter' are specific. Among sibling tools, it is distinct as the only one specifically for formal letters, while others handle templates, email drafts, or other document types.

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 implies usage when a formal business letter is needed, but it does not provide explicit guidance on when to use this tool versus alternative tools like 'create_email_draft' or 'render_docx_template'. No exclusions or prerequisites are mentioned.

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