Add shopping item

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

Annotations already convey that the tool is mutating (readOnlyHint=false) and not destructive, and the description adds a concrete side effect: adding an item with quantity and category. It does not mention behaviors such as dry_run producing no write or idempotency_key replay semantics, but those are documented in the 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?

A single sentence that leads with the action, gives the resource, and states the key requirement with no filler. It is efficiently front-loaded for an agent to parse.

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 is adequate for a simple add action, and the schema covers six parameters and an output schema. However, the phrasing 'with a quantity and category' could imply these are required when only name is required, and there is no mention of when to prefer this over sibling tools.

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 baseline is 3; the description only restates that the tool uses item name, quantity, and category. It adds no semantic detail beyond the schema, such as formatting, defaults, or the member/idempotency 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 names a specific action and target ('Adds an item to the shopping list'), which makes the tool's core purpose immediately clear. It does not explicitly differentiate from related siblings like check_off_shopping_item or clear_shopping_list, so it falls short of a 5.

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 is given about when to use this tool versus sibling tools, nor are exclusions or alternatives named. The only hint is 'Needs the item name', which is a prerequisite rather than usage context.

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