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

Annotations are all false and add no safety profile, so the description carries the burden. It discloses what the tool returns (applied filters, current options, comparability limitations) and that it avoids selecting a winner, plus the canonical-link requirement. It does not discuss side effects, but a comparison tool with no positive hints is adequately transparent.

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 dense but front-loaded: the main purpose and trigger condition come first, followed by output behavior, link handling, and exclusions. Every sentence contributes, though the 'outside comparison intent' and 'Do not use for' sentences partially overlap.

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?

It covers the main purpose, invocation condition, output contents, link requirements, and major exclusions. With an output schema present, the lack of explicit return-format details is acceptable; only minor details like how 'implied' filters get resolved are unspecified.

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 should compensate for parameter meaning. It only refers generically to 'instrument and maturity filters' and 'bounded' comparison, never naming limit, minimum_term_months, maximum_term_months, or their constraints. The schema names help, but the description adds little semantic value beyond the structured fields.

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 uses a specific verb-resource pair ('Create a bounded side-by-side comparison') and names the instrument categories (CD, money-market, Treasury, municipal), clearly distinguishing from the sibling search/fetch tools by excluding find/list requests and instructing not to call fetch.

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 explicitly states the trigger condition ('only when the user explicitly asks to compare, contrast, versus, or vs current ... options') and provides detailed exclusions: find/list requests, economic/Fed forecasts, account actions, personalized advice, tax advice, suitability. It also tells the agent not to fall back on fetch for links.

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