validate_argument

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

The annotation readOnlyHint=true already indicates a read-only operation; the description reinforces this and adds the extra behavioral detail 'No approval needed', which goes beyond the annotation. It also names the RPC and lists allowed input types, but does not mention error behavior or the return format.

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 concise sentences front-load the action and include the essential type list. Every sentence adds value with no redundancy or filler.

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?

An output schema exists, so return-value details are not needed. However, with four parameters and no schema descriptions, the description leaves 'binding_id' and 'argument_name' underspecified, making it incomplete for a fully informed invocation. It covers the core purpose but not all parameter semantics.

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%, so the description must compensate. It partially does by enumerating valid values for 'type', but it does not explain the purpose of 'binding_id' or 'argument_name'. The meaning of 'value' is implied but not clarified. This leaves half the parameters underspecified.

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 clearly states the tool's function: 'Validate an argument value against an OliveTin argument type' (specific verb + resource) and enumerates the supported types. It is unambiguous but does not explicitly differentiate from sibling tools such as start_action_async or list_olivetin_actions.

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?

Provides a useful usage trait: 'No approval needed — read-only.' However, it lacks explicit when-to-use guidance or mention of alternatives. The context that this is a validation RPC implies when it would be used, but no exclusions or preferred scenarios are stated.

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