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

Annotations already declare the safety profile (destructiveHint=true, idempotentHint=false, openWorldHint=true), so the bar is lower. The description adds one genuinely new trait — that invitations send notifications, i.e. an outbound side effect — but says nothing about what happens when the recipient already has access, whether re-inviting is rejected, or that the operation creates a persistent share entry.

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?

Two short sentences, front-loaded with the action and scope, with the notification caveat placed last. No filler.

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?

An output schema exists, so return values need no explanation, and the safety profile is annotation-covered. Still, for a destructive, non-idempotent mutation the description should mention duplicate-share behavior and permission requirements; those gaps leave an agent guessing.

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 carry parameter meaning. It usefully explains that target is a document or project and that recipient may be a user, email, or phone — matching the three anyOf branches — but leaves 'id' (which entity's id) and the role enum (ADMIN/EDITOR/VIEWER effects) entirely unexplained.

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 concrete verb (grant access) and the resource types (document or project) plus the recipient shape, which clearly separates it from list_shares, update_share and remove_share. It stops short of explicitly naming those siblings, so 4 rather than 5.

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?

Usage is implied by the action itself, and the note that invitations send notifications hints at a real-world side effect, but there is no explicit when-to-use vs. when-to-use-update_share guidance and no stated prerequisites such as needing owner/admin rights on the target.

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