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

Annotations declare readOnlyHint=false, idempotentHint=true, destructiveHint=false; the description adds real value by disclosing the 7-day link expiry, that nothing is created until the farmer opens the link and verifies email, and that no API key is required. This resolves the potential confusion of a write-flagged tool that also claims nothing is created yet. Minor gap: no rate-limit or delivery details for the link.

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 tight sentences, front-loaded with purpose and return value, then the expiry/deferred-creation constraint. Every sentence carries information an agent needs.

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 no output schema, the description compensates by explaining what the caller receives (the prefilled signup link) and its lifetime. Combined with 100% schema coverage and the annotation safety profile, nothing needed to call it correctly is missing.

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 every parameter is already documented with types and maxLength. The description paraphrases the same fields (name, email, optional farm name/state/phone/species) without adding format or constraint 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?

States a specific verb and resource ('Start a QuailOS signup from chat') and immediately says what it returns (a personal prefilled signup link). It is clearly distinguishable from the create_* siblings because it produces a deferred link rather than a committed record.

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?

The phrase 'from chat' implies the conversational context and the deferred flow hints at when this is used instead of create_customer, but no sibling is named and no explicit when-not condition is given. Usage is inferable rather than stated.

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