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

Annotations already declare readOnlyHint=true, openWorldHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds valuable context beyond annotations: the data source (FRED) and the specific series (DCOILWTICO, DCOILBRENTEU, etc.), plus the inclusion of a spread and market signal. This enhances understanding of the tool's behavior without contradicting the annotations.

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?

Two succinct sentences: the first states the action and lists the exact commodities, the second adds the spread, signal, and source. No fluff, important details front-loaded, every clause earns its place.

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 zero-parameter read-only tool with an output schema present, the description fully covers what the tool does, what it returns (specific series, spread, signal), and the data source. It is complete without needing to explain output schema details, which are already structured.

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 has zero parameters, so the baseline is 4 per the rubric. The description naturally needs no parameter explanations; it correctly focuses on the return payload and source.

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 states it 'Returns current energy commodity prices in one call' and explicitly lists the four included commodities, clearly distinguishing it from sibling bundles like get_bundle_crypto or get_bundle_fx_dashboard. The verb 'Returns' is specific to the resource and the scope is unambiguous.

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 clearly indicates when to use this tool: when you need current energy/commodity prices in a single call. It doesn't explicitly contrast with alternative bundle tools, but the sibling names (e.g., get_bundle_crypto) and the clear commodity focus imply the appropriate context. No exclusionary guidance is provided, which would warrant a 5.

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