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

Goes well beyond the annotations (readOnlyHint=false, destructiveHint=false) by disclosing auth requirements for both modes: private links make recipients collaborators who 'need an account', while public links are read-only with 'no account and no sign-in at all'. It also names the owner-only restriction and warns about misuse of the public mode.

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?

A single dense sentence, but the purpose and owner-only constraint are front-loaded and the guidance builds logically to the public-mode warning. Slightly long, though each clause carries information rather than padding.

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?

Covers access requirements, both link modes, and the decision rule for the non-default option, which is what an agent needs to call it correctly. It stops short of noting that the call returns the link/URL, a minor gap given there is no output schema.

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%, so the baseline is 3; the description still adds value by explaining the behavioral consequence of the isPublic flag (read-only page vs. collaboration link) rather than just restating its type. It does not add anything for maxUses, permission, or expiresInDays, so it falls short of 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 ('Create a share link for a trip') and immediately scopes it with '(owner only)'. The agent can distinguish this from trip_share_list and trip_share_revoke without opening any schema.

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?

Explicitly describes the default path (private collaboration link) versus the alternative (isPublic: true for a public read-only page), and states the condition that selects the alternative: only when the user explicitly wants a handout page, 'not merely to get around a collaborator limit'. Nothing is left to inference.

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