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

Annotations already declare readOnly/idempotent/non-destructive, and the description adds real behavioral context beyond them: null semantics, the coupling to payout-run enablement, a required billing-read credential scope, and a concrete failure mode (403 for unclaimed sandbox keys). This is the kind of prerequisite and failure information an agent cannot get from structured fields.

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 core purpose, then the field list, then the null/prerequisite caveats — a sensible ordering with no filler. The middle sentence about payout runs is slightly tangled ('while those are not switched on...'), costing a bit of readability.

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 carries the burden of describing return values and does so field by field, including the null case. Combined with the credential-scope and claimed-workspace prerequisites, an agent has everything needed to call it and interpret the result.

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?

The tool takes zero parameters, so the baseline of 4 applies. The description correctly spends no words on parameter semantics and instead documents the response shape, which is the only relevant surface here.

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?

A specific verb ('Read') on a specific resource ('your workspace's payout schedule'), followed by an enumeration of exactly which fields come back (on/off, weekly vs monthly, run day, auto-retry, next run day, requested period, last run result). It also positions the resource relative to payout runs, so an agent can separate it from get_payout_run/list_payout_runs without opening a schema.

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?

Clear context on when the tool is applicable and when it will return nothing: schedule is null when none is saved, and execution.enabled is false while payout runs are not switched on. It never explicitly routes to the alternative (set_payout_schedule to change it, list_payout_runs for history), so it stops short of naming alternatives.

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