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

readOnlyHint=true already declares the safety profile, and the description reinforces it by citing the GET /relatedtypes endpoint. It does not describe the response shape, ordering, or whether an empty list is possible, so added behavioral value is modest.

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 with the concept front-loaded and a helpful example; the raw endpoint string is slightly technical filler but does convey the read-only GET semantics.

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 single-parameter read tool with full schema coverage, the description covers what it does and gives an example; only the return value (a list of module names) is left implicit, which is a minor gap with no output schema present.

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 parameter description already names valid modules and points to vtiger_list_modules. The description only adds the mapping of the 'module' argument to the elementType query parameter, which is marginal.

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 states clearly that it returns the modules related to a given module, with a concrete example (Accounts relate to Contacts, Potentials, Cases, Documents). It is distinguishable from vtiger_list_modules by the 'related to' framing, although it never names that sibling explicitly.

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 only implied: an agent can infer this is a discovery step before listing related records, but there is no statement of when to prefer it over vtiger_list_modules or vtiger_describe_module, and no prerequisites or exclusions.

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