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

Annotations already declare readOnlyHint=true, and the description adds the grouping criteria and REST endpoint. However, it does not disclose return format, pagination, or other behavioral traits beyond what the annotations suggest. This is acceptable but not rich.

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 only two sentences, front-loaded with the core purpose. The REST endpoint reference is useful and every word serves a purpose with no redundancy or filler.

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 simple read tool with full parameter schema and a safety annotation, the description conveys the core idea. However, with no output schema, it would benefit from explicitly stating the return format (e.g., a list of ticker symbols), which is currently only implied by 'Peer companies'.

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?

Schema description coverage is 100%, with both symbol and grouping parameters fully described. The tool description adds no new parameter semantics beyond the schema, so it relies on the schema, which is adequate.

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 peer companies for a symbol, specifying the criteria (same country and GICS sub-industry). The REST endpoint reference adds precision and distinguishes this from sibling tools that fetch other data types.

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 usage when peer companies are needed, which is clear from the resource name and behavior. However, it does not explicitly mention alternatives or when-not-to-use scenarios, though sibling tools are sufficiently differentiated by their own descriptions.

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