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

Annotations already declare destructiveHint=true, idempotentHint=false and readOnlyHint=false; the description goes further by naming the recipient, stating the action is irreversible ("can't be taken back") and mandating a confirm-first flow ("show the user exactly what you'll send and ask first"). It does not describe what happens after sending (reply timing, failure modes), which keeps it short of a 5 given the destructive flag.

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 with the core action and content list, then trigger, then constraints, then safety. Every sentence carries information, but it is delivered as one dense block and the offline-file workaround sits inside the same paragraph as the confirmation rule, making it slightly harder to scan than it could be.

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 10-parameter irreversible send with no output schema, the description covers the recipient, the payload, the trigger, the offline-file fallback and the required user confirmation. Nothing an agent needs in order to call this safely and correctly is missing.

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 100%, so a 3 is the floor; the description still adds real meaning about the links parameter (must be web addresses the user supplied, e.g. Google Drive/Dropbox/site) and what to do when files are not online. It adds nothing for name, email, company, colors, fonts or notes beyond 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 ("Sends Nikita a company's brand guidelines for a video") and enumerates exactly what is transmitted: brand book links, logo and font files, colors, fonts, logo rules and tone of voice. It is clearly distinguishable from siblings like send_brief (the brief itself) and get_upload_link (the offline-file fallback).

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?

Gives an explicit trigger ("Use it when the user wants VIDEO DEPT. to have their brand guidelines, usually with or after a brief") and names the alternative path for the main edge case: offline files go through get_upload_link or email to nikita@videodepartment.org. Both when-to-use and the alternative routing are spelled out, not inferred.

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