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

Goes well beyond the readOnly/idempotent annotations by disclosing that nothing is stored, that answers are not embedded in the links, and what is returned (short summary plus both links). The PII prohibition is an explicit behavioral guardrail not derivable from any structured field.

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?

Front-loaded with the trigger, then inputs, outputs, exclusions, and the safety rule — every sentence carries information. It is a dense single block, though, and the input list plus PII rule could be tightened or split for faster scanning.

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 read-only handoff generator with full schema coverage and its own output schema, the description covers trigger, allowed inputs, return shape, downstream use (paste into application or Telegram bot), explicit non-goals, and a data-safety rule. Nothing an agent needs 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 the baseline is 3; the description adds real meaning by enumerating the five non-sensitive inputs and, more importantly, stating what must never be passed (names, emails, card numbers, government IDs, bank details). It does not add format or mapping hints for the enum bands beyond the schema text.

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?

Specific verb and resource ('start... handoff', carries chat answers into an application) plus explicit scope boundaries: 'Does not submit an application, approve an account, or quote fees.' That negative framing separates it from start_application and the checklist siblings without needing to name them.

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 trigger condition is explicit: 'Use when a merchant is ready to apply with RetryHub and wants to carry what they already said in this chat into the application.' Exclusions (no submission, no approval, no fee quotes) further narrow usage, though no alternative sibling tool is named for when this is the wrong choice.

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