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

Annotations already declare destructiveHint=true, readOnlyHint=false, and non-idempotency, so the safety profile is covered. The description adds genuine value with 'A routine item is skipped for that day only,' clarifying that a routine occurrence is a temporary exception rather than a permanent deletion. It does not say whether non-routine items are removed permanently or whether the change is reversible.

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?

Two short sentences, front-loaded with the core action, and the second sentence carries non-redundant scope information about routine items. Nothing is wasted.

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 destructive, non-idempotent mutation with no output schema, the description is thin: it does not state what the response is, whether removal is permanent, or how to re-add the item. Annotations cover the safety signal, but the agent lacks enough context on the non-routine deletion path.

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 coverage is only 50%: 'date' is documented with its format and timezone in the schema, but 'itemId' is undocumented in both schema and description. The description alludes to 'one item' and 'a day's plan' but adds no syntax, sourcing, or meaning beyond that, leaving the required parameter's semantics unexplained.

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 specific verb ('Remove') and resource ('one item from a day's plan'), which is clear and scoped. It does not explicitly distinguish itself from the close sibling edit_plan_item or set_plan, so an agent must infer the boundary from names alone.

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 when-to-use guidance, no prerequisites, and no named alternative (e.g., edit_plan_item for modifying rather than removing, or set_plan for bulk changes). The only guidance is the indirect semantics of skipping a routine, which is behavioral rather than usage-oriented.

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