cas_columns

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

The annotation already declares readOnlyHint=true, so the safety profile is covered. The description adds genuine behavioral context beyond the annotation: columns are returned whether the table is loaded or not, and for a database caslib the CAS server queries the underlying database. It stops short of return format or cost/performance detail.

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?

It is a single terse sentence with no filler, which is good, but the terseness tips into under-specification rather than disciplined conciseness. The parenthetical is awkwardly placed and reads as an afterthought.

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 two-parameter read tool with no output schema, the description should at least convey what is returned (e.g., column metadata) and how to scope the request. It omits return shape entirely and leaves both parameters undocumented, so it is thin for the task.

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 0% and neither the caslib nor table parameter is explained in the description. The names are largely self-evident, which prevents a 1, but the description does no work to compensate for the missing schema documentation.

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 identifies the resource (columns of a CAS table) but reads as a fragmentary noun phrase rather than a clear verb+resource statement, leaving the action (list/retrieve columns) implied. It distinguishes itself loosely from cas_tables and sas_columns by scoping to CAS, but the parenthetical about database caslibs muddies rather than clarifies the core purpose.

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?

There is no statement of when to use this tool versus close siblings such as cas_tables, sas_columns, or describe_table. The only directional hint is the parenthetical about database caslibs, which describes a backend behavior rather than a usage condition.

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