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

Annotations already declare destructiveHint=true and idempotentHint=false, so the safety profile is covered; the description adds real value beyond that by noting the permission requirement and, importantly, that removing the rule does not change existing cell values. It does not say whether the deletion is undoable or what happens to cells that violate downstream rules, leaving a small gap.

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 compact sentences front-load the action and its constraint, with no filler. The trailing 'Signature:' line is somewhat redundant with the input schema, keeping it just under the top mark.

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?

With annotations covering safety and an output schema present, the description supplies the remaining essentials: permission requirement, non-effect on cell values, and id provenance. Only the reversibility/undo story and the undescribed file_uuid are left open.

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 67% and the schema itself already documents id and sheet; the description's signature line mainly restates required vs optional. It adds only the origin of the id (files_validations) and marks sheet optional, without compensating for the undocumented file_uuid. Baseline 3 is appropriate.

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 and resource ('Removes a data-validation rule') with concrete examples of what a validation rule is (checkbox/dropdown/etc.) and how it is addressed (by id from files_validations). This clearly separates it from the many files_set_*_validation siblings, which create rules rather than delete them.

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?

Explicitly states the precondition ('Requires edit permission') and points at files_validations as the source of the id, which is the practical routing information an agent needs. It does not name an explicit alternative or when-not-to-use case (e.g., to modify a rule use the set_* variants), so it stops short of a 5.

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