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

Goes well beyond the annotations: discloses that anyone with the link can read it until it expires, that rates and amounts are never shown, that notes are included unless include_notes is false, that the link is returned only once and must be passed to the user, and that demo accounts cannot use it. These are exactly the behavioral traits an agent needs before invoking a non-idempotent, irreversible link-creation 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?

Four sentences, each carrying distinct information: what it produces, what the link reveals, the confirm-before-calling rule, and the one-time-return plus demo restriction. Front-loaded with the core action.

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?

With an output schema present, the description needn't explain return shape, and it still flags the critical one-time-visibility constraint. Annotations cover the safety profile and the description covers exposure, prerequisites and availability, leaving no meaningful gap for a 7-parameter tool.

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 meaning by explaining that client/project scope the frozen hours, that include_notes=false suppresses work descriptions, and that the link expires. It does not add new detail on from/to/title/expires_in_days beyond what the schema already documents.

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 ('Freeze the hours of a date range ... into a private link') plus the recipient and scope (optionally one client or project). It is clearly distinguishable from get_timesheet because the output is an externally openable, account-free link rather than the caller's own view.

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 says to confirm the range, the client and the include_notes choice with the user before calling, and adds a hard availability gate ('Not available on demo accounts'). That is concrete when-to-use and precondition guidance rather than vague context.

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