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

No annotations are provided, so the description carries the behavioral burden. It makes clear that this is a read of the current value and defines the metric, but it does not address operational traits such as data freshness, update cadence, or any access caveats. The simple read nature limits the risk.

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 short sentences, with the primary capability front-loaded and the metric definition in the second. No redundant wording; every sentence adds value.

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 current-value endpoint with an output schema present, this description is complete. It explains the meaning of the index and defines the output scope (current value plus per-tier breakdown), leaving only schema details to the structured output.

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 tool has zero parameters, so there is no parameter semantics to document; this earns the baseline of 4. The description adds useful context about what the returned composite represents without needing to describe inputs.

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 opens with the imperative 'Get the current SIT-Composite index value + per-tier breakdown', specifying both the resource and the snapshot nature. The second sentence defines the composite precisely, distinguishing it conceptually from other model/provider tools.

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 word 'current' clearly signals this is the snapshot endpoint, contrasting implicitly with get_composite_history. It does not explicitly name alternatives or exclusions, but the usage context is clear enough for a no-parameter tool.

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