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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, openWorldHint=false), so the bar is lower. The description still adds real value by clarifying that generating the link sends nothing and that dispatch only happens when the user presses send in WhatsApp, which is exactly the doubt an agent would have about a contact tool. It could say more about link format or lifetime, but the core behavioral concern is addressed.

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 sentences, zero padding, with the core deliverable stated first and the safety reassurance second. Nothing repeats the annotations or wastes space.

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?

There is no output schema, but the description does describe the return value as a click-to-chat link and explains the non-sending behavior, which is the key thing an agent needs. Missing details like whether the link is prefixed with a URL scheme or has any expiry keep it from a 5.

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 100%, so every parameter is already documented in the schema, including the defaulting rule for topic and the plant-listing behavior. The description only restates the parameter names as message ingredients, adding no syntax or format detail beyond the schema. Baseline 3 applies.

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 names a concrete verb+resource: it produces a WhatsApp click-to-chat link with a pre-filled message, and enumerates what goes into the message (topic, plants, community, notes). That is far more specific than a tautology. It does not, however, explicitly differentiate itself from the sibling build_designer_link, which is the other link-generating tool.

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?

It gives a clear trigger condition: use it when the person wants a quote, a visit, or help from the team. That is genuinely useful call-site context. There are no explicit exclusions or named alternatives (e.g. 'for design links use build_designer_link'), so it stops short of a routing rule.

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