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

Annotations already declare a non-read-only, non-destructive, non-idempotent mutation. The description adds genuinely useful context beyond that: an edit-permission prerequisite, the guarantee that table data is unchanged, and that unlisted columns are left alone. It stops short of describing what happens on a name mismatch, which would push it higher.

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 purpose is front-loaded in the first sentence and the rest is dense, purposeful detail. Some of the columns-object expansion duplicates the schema's own field descriptions, costing a little efficiency but aiding quick comprehension.

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 an output schema present, return values need not be explained, and the description covers permission requirements, scope of change, and data invariance. The only thin spot is file_uuid, which is undocumented in both schema and description, but its meaning is inferable from the signature.

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 75%, so it already documents cell, sheet, and the nested column fields. The description reinforces the important semantic that name refers to the column's CURRENT name and that new_name/hidden are optional per-entry, plus a compact signature. It adds modest value over the schema rather than new information.

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 gives a specific verb pair and resource: 'Renames or shows/hides the columns of a data table'. That is far more useful than the bare tool name and clearly separates it from generic write tools. It does not, however, name or contrast with nearby table siblings such as files_table_meta or files_table_sort.

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?

Usage is implied through the 'Requires edit permission' note and the scoping statement that only listed columns change, which tells the agent this is a targeted column-metadata edit. There is no explicit when-to-use vs alternative guidance or exclusion against other table tools, leaving the agent to infer selection.

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