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

Annotations already declare readOnlyHint=true and destructiveHint=false, and the description adds useful behavioral context: it is rendered from the snapshot's stored card, is not a re-run, is informational, does not affect Tailwind scoring, and requires no auth. This meaningfully supplements the annotations without contradicting them.

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 long and uses emphatic capitalization, but it is front-loaded with the core purpose and every listed detail about the audit contents is decision-relevant since there is no output schema. The structure is readable and the verbosity is justified by the absence of structured return documentation.

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 one-parameter read-only tool with no output schema, the description is nearly complete: it explains the input, return contents, auth requirements, and informational nature. The only notable gap is what happens when no audit is on file for the given handle, but that is a minor edge case.

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 0% and the only parameter is a bare string `who`. The description compensates by defining it as 'an X handle,' which is essential semantics. It would benefit from specifying formatting (e.g., with or without @), but for a single parameter the description provides enough meaning.

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 opens with a precise statement: 'THE LAST AUDIT ON FILE FOR AN ACCOUNT, IN FULL.' It clearly names the resource (a stored audit snapshot), the input (an X handle), and distinguishes this from a re-run or live audit. This is a specific verb-plus-resource statement that separates it from sibling tools like x_account_audit.

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 when it should be used by saying 'not a re-run' and noting audits are informational and do not change Tailwind scoring since 2026-09-24. However, it does not explicitly name an alternative or state 'use x_account_audit for a fresh audit.' The guidance is implied rather than explicit.

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