billing_history_create

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

With no annotations provided, the description carries full responsibility for behavioral disclosure. It only states the operation 'create', implying a mutation, but does not mention any side effects, required authorizations, data persistence, or potential errors. This is a significant gap for a write operation.

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, concise sentence with no unnecessary words. It is appropriately brief for a simple creation tool, though it could benefit from a bit more contextual detail without becoming verbose.

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 simple nature of the operation, the schema coverage is complete, and there is no output schema to explain, the description is minimally sufficient. However, it lacks context on what a billing history entry is, how it relates to billing providers, or any validation rules, leaving some ambiguity for the agent.

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 100%, so each parameter (amount, description, providerUuid) has a minimal description in the schema. The tool description adds no additional meaning beyond what the schema provides, and does not clarify units, formats, or relationships between parameters. Baseline 3 is appropriate since the schema handles documentation.

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 'Create a billing history entry' clearly states the action (create) and the resource (billing history entry), which distinguishes it from sibling tools like billing_history_list and billing_history_delete. It is specific enough for an agent to understand the primary operation, though it lacks detail on what constitutes a billing history entry.

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, no prerequisites, and no mention of conditions under which creation is appropriate. The description provides no context about the relationship to billing providers or nodes, leaving the agent to infer usage from the name alone.

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