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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds useful behavioral context by mentioning the stage timeline and the normalized representation, but it does not disclose error behavior, response structure, or any rate-limit concerns. This is adequate 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 extremely concise, uses three short sentences, and front-loads the core action before the reference to the sibling representation. Every sentence contributes useful information without redundancy.

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 one-parameter read operation with strong annotations and full schema coverage, the description is largely complete. It tells the agent what will be returned (stage timeline and normalized representation), though it omits failure or not-found behavior. Given the tool's simplicity, this is a minor gap.

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 input schema already fully documents the single parameter, including a concrete example ('tr_abc123'). The description reinforces the trace_id format but does not add meaningful meaning beyond the schema, so the baseline 3 applies.

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 the action ('Retrieve'), the resource ('an existing Trace payment trace'), and the lookup key ('trace_id'). It also differentiates the tool from its siblings by noting it returns the stage timeline and the same normalized representation as trace_payment.

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 usage context is implied: use this tool to fetch an existing trace by trace_id, and because it is read-only it is appropriate for inspection. However, it never explicitly names when to prefer this over trace_payment or states an exclusion condition, so the guidance is not fully explicit.

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