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

Annotations already declare idempotent, non-destructive, open-world, non-read-only, yet the description repeats 'idempotent' rather than adding new behavioural detail. It omits what the returned URL does, expiry, and that funding is an external side effect on Stripe – useful context for an open-world mutation that the description fails to supply.

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?

One compact sentence with no filler and the key verb('create') front-loaded. Slight inefficiency because 'idempotent' duplicates the annotation rather than adding information.

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?

Output schema exists so return structure need not be explained, and annotations cover safety flags. However, for a three-param, open-world mutation with zero schema descriptions, an agent needs to know what happens to a reused idempotency_key and what amount units mean – neither is addressed.

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 0% and the description names zero of the three required parameters. The 'idempotent' claim loosely maps to idempotency_key but gives no syntax or collision semantics; amount and schema_version are wholly unmentioned in prose.

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+resource ('Create a ... Stripe Checkout URL') and adds the qualifying scope 'for human prepaid funding', which no sibling covers. It stops short of 5 only because it doesn't name or contrast with any sibling 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?

No when-to-use, when-not-to-use, or prerequisite guidance. An agent cannot tell from the description whether this precedes run_buyer_job or is the sole funding path. 'Human prepaid funding' hints at a context but is not actionable guidance.

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