get_feature_matrix

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is fully covered. The description adds modest value by specifying the three content categories (features, safety exclusions, runtime readiness) but provides no detail on behaviors like data freshness, caching, or size of the returned matrix.

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?

Single sentence, front-loaded with the verb 'Return,' and efficiently enumerates the three content categories. No waste, though the phrasing 'safety exclusions' is slightly ambiguous.

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?

The tool is simple (zero params, no nested objects, rich annotations, and an output schema), so the bar for description completeness is lower. The description adequately captures the tool's scope, though it doesn't clarify what 'safety exclusions' means or how 'runtime readiness' is expressed, which could matter for an agent deciding whether to rely on this 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, making parameter semantics inherently trivial. The schema coverage is 100% (empty schema is fully documented). Baseline 4 applies for zero-parameter tools.

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 states it returns 'implemented features, safety exclusions, and runtime readiness,' which names the verb (return) and resource (feature matrix) with the three categories of content. However, it's somewhat abstract—it doesn't clearly say what distinguishes this from sibling tools like discover_capability or get_conformance_report, which overlap conceptually.

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 implies this is for checking what's implemented and ready, but gives no explicit guidance on when to call it versus siblings like discover_capability (capability discovery) or get_conformance_report (conformance checking). No exclusions or alternatives are named.

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