AWS MCP Server

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

With no annotations provided, the description carries the full burden of behavioral disclosure. While 'List' implies a read-only operation, the description omits pagination behavior (despite the presence of max_results), rate limiting, authentication requirements, or what the return structure contains.

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 single sentence is front-loaded with the verb and wastes no words. However, given the lack of annotations and output schema, the description is arguably too terse rather than appropriately concise.

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?

Given zero annotations and no output schema, the description should explain behavioral details or return values. As written, the 9-word description is insufficient for an agent to fully understand pagination, limits, or output structure.

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 has 100% description coverage for all three parameters (profile, region, max_results). The description adds no additional parameter context (e.g., that max_results is a string representation of a number), so it meets the baseline score for high-coverage schemas.

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 ('List') and resource ('API Gateway v2 APIs'), and the parenthetical '(HTTP and WebSocket)' implicitly distinguishes this from the v1 REST API sibling tool (aws_apigateway_get_rest_apis). However, it does not explicitly clarify when to prefer this over the v1 variant.

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 description provides no guidance on when to use this tool versus alternatives like 'aws_apigateway_get_rest_apis' or 'aws_apigatewayv2_get_routes'. There are no 'when-to-use' or exclusion criteria stated.

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