senders_list

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 method (GET) and endpoint, but does not mention any behavioral traits like rate limits, response size limits, or side effects. The response format is implied but not detailed, which is partially mitigated by the existence of an output schema.

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 concise, consisting of two sentences that directly state the action and response format. However, it is slightly verbose for an API with no parameters, as the HTTP method and endpoint could be considered redundant if the tool is only used via MCP. Still, it is efficient and front-loaded.

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 has no parameters and an output schema exists, the description is mostly complete. It explains what the tool does and the response structure. However, it lacks details on sorting, filtering, pagination, or authentication requirements, which would be useful for a list operation. The completeness is adequate but not rich.

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 no parameters (0% coverage needed), so the description does not need to add meaning beyond the schema. The description mentions the HTTP method and endpoint, which adds contextual value but is not strictly about parameters. With no parameters, a baseline of 4 is appropriate as the description provides useful context for invocation.

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 verb 'list' and resource 'senders', and it distinguishes itself from sibling tools like 'senders_create', 'senders_get', etc. by focusing on listing all senders. However, it does not explicitly differentiate from other list tools like 'notifications_list' beyond the resource name.

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, such as 'senders_get' for a specific sender or 'senders_list' for filtering. There is no mention of usage context or exclusions, leaving the agent to infer based on the resource name alone.

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