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

The annotations only say readOnlyHint=false, so the description carries real weight and delivers: the link is no-login/private, the URL is displayed exactly once (so the agent knows a failed capture is unrecoverable), and execution is confirm-gated behind confirm: true. It also implies a Coach Pro entitlement requirement. Missing detail on expiry behavior and revocation, which matters for a share-link tool.

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 tight sentences, front-loaded with the core action and the destructive-adjacent caveat (URL shown once) plus the execution gate. 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?

For a 4-param mutation tool with no output schema and minimal annotations, the description covers what an agent most needs: the privacy model, the one-shot URL, the tier requirement, and the confirm gate. The remaining gap is expiration semantics and lifecycle management (revocation lives in a sibling), which is secondary.

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 only 25% (confirm alone), so the description must compensate. It re-states the confirm gate but says nothing about expiresInDays (1–90 bound, default behavior) or clarifies planId's relationship to planType beyond 'a workout or diet plan'. Most of the parameter surface remains undocumented in both places.

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+resource: creating a private no-login share link for a workout or diet plan, with scope qualifiers (branded PDF, Coach Pro tier). This is clearly distinguishable from siblings like create_client_portal_link, share_uploaded_pdf_plan, or revoke_plan_share_links, though no sibling is named outright.

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 the use context ('to send by WhatsApp') and explains the two-step invoke pattern (previews until confirm: true), which tells the agent how to actually call it. It stops short of naming alternatives or stating when NOT to use it (e.g., versus a client portal link).

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