GCP Billing and Monitoring 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. It states the tool retrieves the IAM policy but does not mention critical behaviors like authentication requirements, rate limits, whether it's read-only (implied but not explicit), or what the output format looks like. This leaves significant gaps in understanding how the tool operates.

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 that directly states the tool's purpose without unnecessary words. It is front-loaded and wastes no space, making it highly concise and well-structured for quick understanding.

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 moderate complexity (retrieving IAM policies with 2 parameters) and no output schema, the description is minimally complete but lacks depth. It covers the basic action but omits details on authentication, output format, and usage context, which are important for an IAM-related tool in a cloud environment.

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, clearly documenting both parameters ('project' and 'requestedPolicyVersion') with details like defaults and constraints. The description adds no additional semantic information beyond what the schema provides, so it meets the baseline score of 3 for adequate but not enhanced parameter context.

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 clearly states the action ('Retrieve') and resource ('IAM policy for a Google Cloud project'), making the purpose specific and understandable. However, it does not explicitly differentiate from sibling tools like 'gcp-iam-test-project-permissions' or 'gcp-iam-analyse-permission-gaps', which might involve IAM policies but serve different purposes.

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. It lacks context such as prerequisites (e.g., needing project access), comparisons to siblings (e.g., 'gcp-iam-test-project-permissions' for permission testing), or scenarios where retrieving the IAM policy is appropriate, leaving the agent with minimal usage direction.

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