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

Annotations already declare readOnlyHint=false, openWorldHint=true and destructiveness=false, so the description adds rather than repeats: it discloses the real access consequence (anyone_with_link opens without signing in) and states the return payload (link plus embed URL) despite there being no output schema. It does not address whether repeated calls mint new links or whether links can be revoked/expire, which is notable for a sharing action.

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?

Three compact sentences with no filler, and the core action plus access implications are front-loaded before the return value. Nothing is redundant, though the sentence fragments ('anyone_with_link opens without signing in') are terse to the point of being slightly telegraphic.

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 three-parameter mutation with a fully described schema and no output schema, the description covers purpose, access semantics and return shape, which is most of what an agent needs. The remaining gap is link lifecycle — expiry, revocation, whether repeat calls create duplicate links — which an agent would reasonably want before calling.

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%, and the schema itself already states 'Who can open the link. Default anyone_with_link.' The description does extend the enum meaning by spelling out the sign-in consequence of each value, which is genuine added value, but it says nothing about allow_comments and adds no syntax or constraint detail.

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 specific verb and resource ('Creates a link to a document') and scopes it with 'you own,' which separates it from create_document and create_upload_url. It stops short of naming any sibling explicitly, so an agent still infers differentiation from the names alone.

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 audience explanation — an agent can infer when to pick anyone_with_link versus signed_in — but there is no statement of when to use this tool instead of get_document or create_upload_url, and no prerequisites or exclusions. Adequate but leaves routing to inference.

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