create_contact_list

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

No annotations provided, so description carries full burden. It only states creation but does not disclose behavioral traits such as idempotency, error handling, or confirmation behavior. For a creation tool, more detail is needed (e.g., does it overwrite an existing list?).

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?

Single sentence is concise and front-loaded. It communicates the core purpose without filler. However, given the simplicity, it could be slightly more informative without losing conciseness.

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?

Tool is simple with one parameter and no output schema. The description could mention what the tool returns (e.g., list ID or confirmation) to be complete. As is, it is barely adequate for an agent to use correctly.

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 coverage is 100% with a single parameter 'name' already described. The description adds no extra meaning beyond the schema, not even format constraints. Baseline of 3 is appropriate given full schema coverage but no added value from description.

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?

Description uses specific verb 'create' and resource 'contact list' with context 'in SendGrid'. It clearly states the tool's action and resource, but could better differentiate from siblings like 'add_contacts_to_list' or 'update_contact_list'.

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?

No guidance on when to use this tool versus alternatives. Does not mention prerequisites, such as having a list name, or context like whether multiple lists with the same name are allowed. Lacks any when-to-use or when-not-to-use information.

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