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

With no annotations, the description must carry the behavioral burden. It does disclose the core behaviors: filtering to future-dated items and ordering by soonest first. However, it does not state whether the operation is read-only, how missing dates are handled, whether the horizon is inclusive/exclusive, or any pagination behavior beyond the schema's limit default.

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, information-dense sentence with no filler. The parenthetical examples are useful and the core purpose and ordering are front-loaded.

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 simple list tool this is adequate, but the absence of an output schema and annotations means the agent gets no guidance on response shape or error behavior. It also does not clarify that collection scopes the query, which a caller would need to know for correct 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?

Schema description coverage is 100%, so the baseline is 3. The description adds minimal parameter meaning: 'dated in the future' relates to the days horizon, but it does not explain how limit or collection affect results beyond what the schema already states.

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 indicates the tool returns items dated in the future, sorted soonest first, with examples that clarify scope (releases, launches, deadlines). It distinguishes itself from siblings like recent_items by focusing on future dates, though it lacks an explicit verb such as 'List' or 'Retrieve'.

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 explicit usage guidance is provided: the description does not state when to prefer this tool over recent_items, feed_items, or search_items, nor does it mention any exclusions or prerequisites. The parenthetical examples imply use cases but leave selection reasoning to the agent.

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