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

Annotations declare a non-read-only, open-world, non-idempotent operation; the description adds real value beyond them by disclosing that emails are sent externally, capped at 10 recipients, attributed to the signed-in person, and that the link is echoed back. It omits failure behavior and whether re-invoking re-sends mail to the same people (non-idempotency implications).

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?

One sentence, front-loaded with the action and its limits, with the return value appended last. Nothing extraneous.

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 3-parameter tool with no output schema, the description covers what it does, who it affects, the recipient limit, and the return shape. Only error/prerequisite conditions (e.g., what happens if the meeting isn't running) are 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 coverage is 67% and the description adds meaning the schema does not: a hard 10-recipient cap on emails and the requirement that the meeting be currently running. The 'about' parameter is left to the schema, which documents it adequately.

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 action (emails the meeting link) and a specific recipient scope (up to 10 people), with the constraint that the meeting is running. This distinguishes it clearly from join_meeting/start_meeting, though no sibling is named explicitly.

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?

'to a running meeting' implies the when (an already-active meeting, not one being scheduled), but there is no explicit guidance on when to prefer this over send_message or send_notetaker, and no stated exclusions.

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