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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, fully covering the safety profile. The description adds the bundled field list and the derived 30-day rate trend signal, which is useful output context, but it does not disclose operational details such as data freshness, units, or data source behavior beyond the series codes.

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 exactly two sentences: the first front-loads the action and lists all key data points compactly, and the second gives a single clear use case. No wasted or redundant words.

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 no-parameter, read-only bundle tool with a rich output schema and strong annotations, the description fully covers what the tool returns and when to use it. Including specific FRED series codes (MSPUS, HOUST) adds precision. With an output schema present, return-value details are not required.

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?

The input schema is an empty object with 0 parameters, and schema description coverage is 100% vacuously. Per the rubric, 0 params yields a baseline score of 4. The description doesn't need to add parameter information, and it doesn't.

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 starts with 'Returns a complete mortgage market snapshot' and then enumerates the specific metrics included (30yr/15yr rates, 10Y Treasury, Fed funds, MSPUS, HOUST, MBS spread, trend signal). This clearly defines the tool's purpose and distinguishes it from sibling bundle tools like get_bundle_crypto or get_bundle_energy.

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?

The description ends with 'Use this for mortgage market analysis,' providing a clear context for when to use it. It doesn't explicitly mention alternatives or when not to use it, but the mortgage-specific scope and the list of other bundle tools in the sibling context imply differentiation.

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