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

No annotations are provided, so the description carries the full behavioral burden, and it discloses nothing: not whether this is a pure calculation, what a 'duration' result looks like (Macaulay vs modified), nor any assumptions about compounding or coupon frequency. Nothing beyond the tool name is communicated.

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?

It is short, but brevity here reflects under-specification rather than conciseness. There is no front-loaded purpose, scope, or parameter context to earn the space.

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 four-parameter financial calculator with no annotations, no output schema, and non-informative parameter descriptions, the definition is inadequate on every axis. An agent cannot confidently construct a correct call or 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?

Schema description coverage is nominally 100%, but the schema text is placeholder filler ('Face to process', 'Rate to process', 'Years to process', 'Coupon to process'), so it conveys no semantics either. The description adds nothing to compensate, and domain-critical details (units, coupon rate vs. yield, per-period vs. annual) are entirely undocumented.

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?

The description is a bare restatement of the tool name: 'Bond Duration: Bond Duration'. It conveys the domain (a bond-duration figure) but no verb, no indication of what is computed or returned. It is effectively a tautology rather than a purpose statement.

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 guidance, no mention of alternatives among the many sibling finance tools (x402-bond-price, x402-bond-yield, x402-bond-convexity), and no input expectations. An agent gets zero routing help from this text.

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