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

The annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered structurally. The description adds that the result is the span set for one trace, which is useful context, but says nothing about ordering, truncation, or volume of spans returned.

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?

A single front-loaded sentence with zero filler: verb, resource, and both identifying inputs in one pass. Nothing is redundant or buried.

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?

With no output schema, the description carries the burden of describing the return value, and it only says 'spans' without indicating shape, ordering, or size. For a two-parameter read tool with strong annotations this is minimally adequate, but an agent still lacks a picture of what comes back.

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%, so both parameters are already documented in the schema with patterns and required status. The description only restates that both ids are used to identify the trace, adding no meaning beyond what the schema provides — the appropriate baseline of 3.

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 uses a specific verb ('Get') plus a precise resource ('the spans of a single DenkOps request trace'), so an agent knows it returns span data rather than a trace summary or list. It doesn't explicitly name sibling list_traces as the alternative for enumerating traces, so differentiation is implied by 'single' rather than stated.

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?

Usage is implied by the 'by project_id and trace_id' phrasing: this tool is for retrieving one already-known trace. There is no explicit when-to-use/when-not clause, no pointer to list_traces for discovering a trace_id, and no statement about what happens if the trace doesn't exist.

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