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

Annotations already declare readOnlyHint=true, destructiveHint=false, so the safety profile is covered. The description adds useful context by naming the returned contents (status and tracking events) and the underlying endpoint, but says nothing about behavior on unknown ids, error responses, or freshness of tracking data.

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, front-loaded with what you get and how to address it, with no filler. The endpoint reference is compact and useful for mapping to the API.

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 single-record read with full annotation coverage and full schema coverage, this is nearly complete; it even hints at the return payload despite having no output schema. Only error/not-found behavior is missing, which is minor here.

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?

One parameter with 100% schema description coverage ('The id shipcloud returned') plus a regex pattern, so the schema does the heavy lifting. The description's 'by id' merely restates it, adding no format or sourcing detail beyond what's structured.

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?

States a specific verb and resource ('One tracker by id') plus the payload it returns ('status and tracking events'), which is enough to distinguish it from shipcloud_list_trackers. It doesn't explicitly name the sibling, so it stops short of a 5.

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?

'by id' implies this is the single-record fetch versus the list tool, but that choice is left to inference. No explicit when-to-use, prerequisites, or named alternative are given.

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