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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the mutation risk is covered structurally. The description adds genuinely useful behavioral context beyond that — removing a closure puts its lessons back on — but says nothing about permanence, whether the removal is reversible, or required permissions.

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?

Eight words, one clause pair, with the action front-loaded and the side effect trailing. Nothing redundant and nothing padded.

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 one-parameter destructive tool with annotations carrying the safety profile, the definition is adequate but thin: it does not say how to obtain the id, whether the action can be undone, or what a successful response confirms. It also omits any mention of the discount/exclusion of lessons that may be affected.

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 100% and the single 'id' parameter is documented as the closure's id. The description adds only the singularity hint ('one closure'), which is marginal; baseline 3 applies when the schema does the work.

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?

Specific verb + resource: 'Remove one closure', which cleanly separates it from add_closure and list_closures in the sibling set. The only friction is terminology drift between the title ('closed days') and the description/schema ('closure'), though the referent is still inferable.

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 when-to-use or when-not-to-use guidance. The agent must infer that it should call list_closures first to obtain the id, and there is no statement about alternatives (e.g., whether add_closure can re-add a removed closure).

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