create_list_item

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 mentions returning a confirmation but does not discuss potential side effects, error conditions, or how listId and listName interact (e.g., precedence). For a create operation, this is acceptable but not fully transparent.

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 well-structured with clear sections (purpose, when to use, parameters, default behavior, returns, related tools). Every sentence is informative and necessary, with no redundancy or fluff.

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 description explains the return value and default behavior, which is sufficient for a simple create operation. It could mention edge cases like what happens if a list with the given name doesn't exist, but overall it provides adequate context for a straightforward tool.

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 already provides a description for every parameter (100% coverage), and the tool description adds examples but does not significantly enhance the meaning beyond the schema. The baseline for high schema coverage is 3, and the description meets but does not exceed that.

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 tool's purpose ('Add an item to a Skylight list') and provides specific examples (grocery list, to-do list) that distinguish it from sibling tools like create_list or update_list_item.

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 'Use this when' section gives concrete scenarios and mentions default behavior when no list is specified. It could be improved by explicitly stating when not to use it (e.g., for updating existing items), but the examples provide adequate guidance.

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