add_parts_to_mylist

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

The description does not contradict the annotations (readOnlyHint=false aligns with 'Add'), but it adds no behavioral context beyond the basic action. It does not mention the requirement for confirm=true, the mutating nature of the operation, or potential side effects, despite openWorldHint=true indicating possible undocumented behavior.

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 sentence, making it concise and front-loaded, but it is sparse and lacks structured detail. It is not verbose, but it provides minimal useful information beyond the basic purpose.

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?

The tool has a nested request object with many fields and no output schema, yet the description is only one sentence. It omits critical information such as the list_id parameter, the confirm boolean required to be true, insertion_index, and the 100-part limit, making the description insufficient for reliable tool invocation.

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 schema has 0% description coverage, and the tool description only vaguely references 'products, packaging, and quantities'. It does not explain critical parameters like list_id and confirm, nor the nested request structure, leaving the agent without sufficient information to construct a valid request.

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 specifies the verb 'Add' and the resource 'to a DigiKey MyList', along with the subject 'approved products, packaging, and quantities'. This distinguishes it from sibling tools like create_mylist and update_mylist_part, though it does not explicitly contrast them.

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, when to prefer alternatives, or any prerequisite conditions such as having a valid list_id or confirming the operation. It leaves the agent to infer usage entirely from the schema.

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