senders_create

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

No annotations are provided, so the description carries the full burden. It only states that a POST request is made and a sender is created with provided information. It does not disclose any behavioral traits such as side effects, authentication requirements, rate limits, or what happens if the name already exists. The description is too thin to inform the agent about consequences.

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 short with three sentences, each adding some information. It front-loads the action ('create a new sender') and includes the HTTP method and endpoint, which is slightly redundant for MCP but not harmful. It could be more concise by omitting the HTTP details, but it is not wasteful.

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 (3 parameters, 1 required, output schema exists), the description is minimally adequate. It mentions that the response contains a JSON object with sender attributes, which aligns with the presence of an output schema. However, it lacks details on idempotency, error conditions, or generated fields (like auto-generated keys). The description leaves moderate gaps.

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 the schema already documents all parameters including examples and descriptions. The description adds no additional meaning beyond referencing 'required attributes'. It does not explain how to use the optional VAPID keys or what the 'name' field represents. Baseline 3 is appropriate as the schema covers the parameters.

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 that the tool creates a new sender, using the verb-resource pair 'create a new sender'. It also mentions the HTTP method and endpoint, which adds specificity. However, it does not distinguish this tool from sibling tools like senders_update or senders_delete, although the name alone differentiates it for creation.

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 does not mention prerequisites, when to use senders_create vs senders_update, or any context that would help an agent decide to invoke this tool. Only the basic action of creating is stated.

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