AWS FinOps MCP Server

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions 'using AWS Cost Explorer,' implying it might query AWS services, but doesn't specify authentication requirements, rate limits, data freshness, or output format. For a tool with 6 parameters and no annotation coverage, this is a significant gap in transparency.

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, efficient sentence with zero waste: 'Analyze data transfer costs using AWS Cost Explorer.' It's appropriately sized and front-loaded, clearly stating the core function without unnecessary details.

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 the tool's complexity (6 parameters, no annotations) and the presence of an output schema, the description is minimally adequate. The output schema likely handles return values, reducing the burden on the description. However, with no parameter semantics and limited behavioral context, it's incomplete for effective use, though not entirely inadequate.

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?

Schema description coverage is 0%, meaning none of the 6 parameters are documented in the schema. The description doesn't add any parameter information—it doesn't explain what 'region_name,' 'profile_name,' or other fields mean or how they affect the analysis. This fails to compensate for the low schema coverage, leaving parameters largely unexplained.

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 states the tool 'Analyze data transfer costs using AWS Cost Explorer,' which provides a clear verb ('analyze') and resource ('data transfer costs'). However, it doesn't differentiate from sibling tools like 'get_cost_by_region' or 'generate_cost_allocation_report,' which also involve cost analysis. The purpose is clear but lacks sibling distinction.

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?

No guidance is provided on when to use this tool versus alternatives. With many sibling tools related to cost analysis (e.g., 'get_cost_by_region,' 'generate_cost_allocation_report'), the description fails to specify context, prerequisites, or exclusions. This leaves the agent without direction on tool selection.

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