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

The annotations already declare that this is a read-only, non-destructive, closed-world operation, so the safety profile is covered. The description adds useful context about the categories of metadata returned but does not go beyond that to describe authorization needs, rate limits, or other operational behavior.

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 a single front-loaded sentence that lists the returned metadata categories with no filler. Every phrase contributes to identifying what the tool returns.

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 zero-parameter read-only introspection tool with a full output schema and clear safety annotations, the description is largely complete. It lists the key returned metadata categories, though it could more explicitly identify 'this service' as the target resource.

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?

This tool has zero parameters, so there are no parameter semantics to explain. The baseline for a parameterless tool is a 4, and nothing in the description creates ambiguity about inputs.

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 concrete verb, 'Return', and lists specific service metadata fields: version, catalog digest, security posture, lifecycle policy, and capabilities. This makes the tool's purpose clear, though the resource is only implied as 'this service' from the title rather than explicitly restated in the description.

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 returned fields: an agent should call this when it needs service-level metadata. However, the description does not explicitly say when to use it, when not to use it, or name any alternative sibling tool.

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