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

With no annotations present, the description carries the full behavioral burden and does so well: it discloses that the operation is permanent, that an editKey is required, and enumerates the precise cascading destruction (links stop working; guest names, RSVP answers, images and app rating erased). This is exactly the kind of consequence information an agent needs before invoking an irreversible delete.

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?

A single dense sentence that front-loads the action and the irreversibility, then lists consequences. No filler, no repetition of the title.

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 two-parameter, no-output-schema, no-annotation delete tool, the description covers action, prerequisite and side effects sufficiently. It could go slightly further on what happens with an invalid or missing editKey and whether the call is idempotent, but nothing critical to correct invocation is absent.

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 description coverage is 0%, so the description must compensate, yet it only addresses editKey (framed as a required credential) and never mentions the 'id' parameter at all. No format, type, or lookup semantics are added for either parameter, leaving half the inputs undocumented anywhere.

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 a specific verb (delete) and resource (letter), with the scope qualifier 'for good' that distinguishes it from update_letter and get_letter. An agent can tell immediately this is the destructive terminal operation on a letter.

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 states a prerequisite ('needs its editKey') and implies irreversibility, which hints at when this tool is appropriate. However, it never names an alternative (e.g., update_letter for non-destructive changes) or states when NOT to use it, leaving the routing decision implicit.

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