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

Goes well beyond the annotations: 'release' bypasses the spam filter and limits and matches or opens a request with an acknowledgement, while 'dismiss' drops files and deletes the row after 30 days. It also states the full-write-access requirement, and these details are consistent with destructiveHint=true.

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?

Front-loaded and nearly every clause carries information, but the long parenthetical-heavy sentences make it denser than needed. Slight tightening would improve it.

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 destructive two-parameter tool with no output schema, it covers the effects, the permission prerequisite, and the retention consequence. It does not say what the call returns or whether the action can be undone, which leaves a small gap.

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 baseline is 3, but the description adds real semantics for the 'decision' values, explaining the downstream consequences of each. The 'letterId' parameter is only covered by the schema, so it is not a 5.

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 and resource ('Decide what a held or failed letter to the support address is') and pins down the two possible outcomes. It is clearly distinguishable from get_support_letter and list_support_letters, which only read letters.

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?

Scopes use to held or failed letters and points at list_support_letters for the id via the schema. It does not explicitly state when not to use it or name a sibling alternative for handling letters, so it falls short of a 5.

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