aws_list_profiles

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

No annotations are provided, so the description carries the burden. It discloses what is inspected (local profiles, active default, regions), and 'List' conveys a non-destructive read, but it says nothing about whether profile files are read from disk, whether credentials are resolved, or any auth/permission requirements.

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. Every clause (profiles, active default, regions) conveys distinct information about the tool's scope.

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 an output schema present, the description needn't document return values, and a zero-parameter read-only tool has little surface area to cover. It is complete enough to invoke correctly, though a brief note on prerequisites (e.g. AWS config files present) would close the remaining 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 tool takes zero parameters, so there is nothing for the description to disambiguate beyond the schema. Baseline 4 applies; the description's enumeration of outputs adds light value but is not required at this parameter count.

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 (List) and resource (local AWS profiles), and goes further by naming the composite return content: active default profile and configured regions. It is distinguishable from write-oriented siblings like aws_switch_profile, though it never explicitly contrasts with them.

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 verb 'List' implies a read-only discovery use case, and the sibling set (aws_switch_profile, aws_ensure_credentials) makes the context inferable, but the description names no alternative or condition for choosing this tool. Usage is implied rather than stated.

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