Usage And Billing 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. 'Get sub-account' implies a read operation, but it doesn't disclose any behavioral traits such as authentication needs, rate limits, error handling, or what the return format might be (e.g., JSON structure). This is a significant gap for a tool with no annotation coverage.

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 extremely concise with just two words, 'Get sub-account', which is front-loaded and wastes no space. Every word earns its place by stating the core action and resource, making it efficient despite its simplicity.

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 simplicity (1 parameter, 100% schema coverage) but lack of annotations and output schema, the description is incomplete. It doesn't provide enough context for an AI agent to understand the tool's behavior, return values, or how it fits with siblings. For a read operation with no structured data on outputs, more detail is needed.

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, with one parameter 'account_id' documented as 'Example value: '. The description adds no meaning beyond this, as it doesn't explain what 'account_id' represents (e.g., parent account ID, sub-account identifier) or provide context. With high schema coverage, the baseline is 3, but no extra value is added.

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 'Get sub-account' states a verb ('Get') and resource ('sub-account'), providing a basic purpose. However, it's vague about what a 'sub-account' entails compared to siblings like 'get_accounts_customers' (plural) or 'get_my_account_profile', lacking specific differentiation. It doesn't clarify if this retrieves a single sub-account by ID or general sub-account data.

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?

There is no guidance on when to use this tool versus alternatives. For example, it doesn't specify if 'get_accounts_customers' should be used for listing multiple sub-accounts or if this is for detailed retrieval of one. No context, exclusions, or prerequisites are mentioned, leaving usage unclear.

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