pingen_cancel_letter

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

With no annotations, the description carries the full burden for behavioral disclosure. It only adds that cancellation is possible 'where cancellable', but does not disclose side effects, reversibility, failure modes, or whether this is a destructive operation. The caveat is helpful but insufficient for a mutation-like operation.

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 a single, clear sentence that states the core purpose without extraneous words. It is front-loaded and efficiently conveys the essential information, making it highly concise and well-structured.

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?

This is a simple one-parameter tool, and the description covers the primary action. However, without annotations or an output schema, it lacks details on what happens after cancellation, error conditions, or what 'cancellable' entails. It is minimally adequate but leaves gaps for the agent to handle unknown edge cases.

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 schema has only letter_id with 0% description coverage. The description does not explicitly explain that letter_id identifies the letter to cancel, nor does it add format or source information. The parameter's meaning is inferable from context and the tool name, but the description adds no value beyond the schema.

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 action ('Cancel') and the object ('a letter that has already been submitted/sent'), which distinguishes it from sibling tools like delete_letter (likely for drafts) or submit/send. The specificity of 'submitted/sent' and the conditional 'where cancellable' adds clear scope, making the purpose unambiguous.

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 this tool is used when a letter has already been submitted/sent, which hints at the appropriate scenario. However, it does not provide explicit when-to-use vs alternatives, nor does it mention any exclusions or prerequisites (e.g., do not use for drafts, use delete_letter instead).

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