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

Goes beyond the annotations by describing the payload: an all-day event on the store's last claim day, claim instructions, the policy link, and alerts 3 days prior and on the day, plus 'Nothing is stored.' This adds real context even though readOnly/idempotent/destructive are already declared.

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?

Front-loaded with the purpose, then the return contents, then a routing hint. Every sentence carries information, though the third sentence is slightly dense and the internal /v1/check path is a bit opaque to a tool-selection agent.

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?

For a read-only generator with no output schema, the description fully explains the returned artifact and its content, its non-persistent nature, and when it becomes relevant. Nothing needed to call it correctly is missing.

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 schema already documents store, purchase_date, member, country, and item. The description only implicitly ties store/purchase_date to the claim window and adds no syntax or defaulting detail beyond the schema, so the baseline 3 applies.

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?

States a concrete verb+resource: produce a calendar (.ics) reminder for the last day to claim a price drop, and names what the file contains. It differentiates from siblings by pointing at /v1/check (check_price_drop_claim) as the origin of the link, though it does not name the sibling tools directly.

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?

Gives the condition under which this artifact is available: '/v1/check gives this link as add_to_calendar when purchase_date is given and a claim is likely.' That effectively tells the agent when this tool applies, but there is no explicit when-not-to-use or named-alternative instruction (e.g., get_store_policy).

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