The institutional tearsheet, reproducible: every ratio re-derivable from the returns series and the published formula ve

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

Annotations already declare readOnlyHint=false, openWorldHint=true, and idempotentHint=false, so the safety profile is partly covered. The description adds important context that the call is paid and uses an x402/base/usdc route, but it does not explain payment failure behavior, auth requirements, or side effects beyond the POST route.

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?

The description is short and front-loads the purpose, then cost, then route. The phrase 'published formula version' is somewhat cryptic, but overall there is little wasted text.

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 return values need not be described. However, for a four-parameter paid financial computation tool, the description leaves critical gaps: it does not explain required inputs, defaults, or when the tool is appropriate relative to siblings.

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%, so the description must explain the four parameters. It only hints at a 'returns series,' which loosely maps to 'returns,' and says nothing about 'risk_free,' 'periods_per_year,' or 'benchmark_returns.' Most parameter meaning is therefore absent from both schema and description.

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 identifies the resource as an 'institutional tearsheet' and says ratios are 're-derivable from the returns series,' but it never states an explicit verb such as compute, generate, or calculate. It also does not distinguish this tool from the many other finance/quant siblings, leaving the agent to infer the exact operation.

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?

It mentions that the tool is paid ($5.00) and provides a remote POST route, but gives no guidance on when to use it versus alternatives like v1_finance_precision, v1_portfolio_risk, or v1_quant_* tools. There are no prerequisites or exclusions beyond the cost mention.

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