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

No annotations exist, so description carries full burden. Discloses auth requirement, return of crypto deposit address, and currency format constraint. Lacks details on fees, idempotency, or whether invoice is immediately created.

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 concise sentences with zero waste. Auth requirement front-loaded. Format example embedded efficiently.

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?

No output schema, but description hints return value. Parameters fully documented. Sibling reference (get-crypto-list) aids context. Could mention processing time or invoice status, but overall complete for a simple top-up tool.

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 covers 100% of parameters with descriptions. Description adds format example and return value context, which complements the schema. Does not fully explain the 'amount_usd' minimum rationale but sufficient.

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?

Description clearly states verb ('Create') and resource ('top-up invoice'), with specific purpose to deposit funds. It distinguishes from siblings like 'get-wallet' by focusing on creation, not balance retrieval.

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?

Explicitly mentions auth requirement and currency format constraint. Provides context (minimum amount) but does not explicitly state when not to use or list alternatives. Siblings include 'get-crypto-list' which is referenced.

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