マーケット温度計（リスクオン/オフ合成スコア）

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

With no annotations, the description carries the burden of behavioral disclosure. It explains the score interpretation (50 neutral, 70+ risk-on, 30- risk-off) and disclaims it as non-investment advice. It might benefit from noting it is a read-only operation, but overall 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 a single, well-structured sentence that covers components, thresholds, extra details (30-day history), and a disclaimer. It is concise and front-loaded with the main function.

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?

Given no parameters and no output schema, the description fully covers what the tool returns: a composite score, component scores, and historical data. It also includes a necessary disclaimer. No gaps remain.

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?

There are no parameters (100% coverage in schema), so the baseline is 4. The description adds no parameter semantics but enriches understanding of the tool's output, which is acceptable given no parameters.

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 clearly states it returns a composite risk-on/off score (0-100) synthesizing VIX, S&P 500, 10-year yield, and dollar index. It distinguishes itself from siblings that provide raw quotes or snapshots by offering a synthesized indicator.

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 does not explicitly specify when to use this tool versus alternatives like get_market_snapshot or get_quote. It implicitly suggests use as an overview indicator but lacks direct comparisons or exclusions.

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