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

Goes well beyond the annotations by disclosing the authorization boundary (only the account owner's API keys and connected apps), the domain preconditions that gate the operation, and the fact that it returns the transfer. None of that is derivable from readOnlyHint/destructiveHint/idempotentHint.

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 then constraints then return value. The only waste is restating the minute enum inline, which the schema already provides.

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?

An output schema exists, so "Returns the transfer" suffices for return behavior. Combined with the unit, allowed values, eligibility gating, and auth requirements, an agent has everything needed to invoke this correctly.

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% and the enum is already declared in the schema, so the description's repetition of the allowed minute values adds no new meaning. The `uetr` parameter receives no mention at all. Baseline 3 applies since the schema carries the semantics.

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?

Opens with a specific verb+resource+unit: "Set how often this transfer's own checks run, in minutes." An agent can distinguish it from recheck_transfer (one-off recheck) and update_transfer (general field edits), though neither sibling is named explicitly.

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 explicit eligibility conditions that function as when/when-not guidance: only paid, actively monitored, unended transfers have a frequency to set; free, finished, or lapsed transfers keep their schedule. It does not name an alternative tool for those ineligible cases, which keeps it just short of a 5.

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