set_property

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

No annotations are provided, so the description carries the full burden. It adds one meaningful behavioral detail: 'The value is coerced to the property's declared Roblox type when known.' This goes beyond a bare mutation statement. However, it does not disclose other important behaviors such as what happens on failure, whether there are permission requirements, or whether the operation is reversible. The disclosure is minimal but not absent.

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 description is a single sentence that immediately states the core action and a key behavioral nuance. It is front-loaded, and every word contributes value. No redundant or filler content.

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?

Given the complexity of the value schema (many Roblox types), the absence of annotations, and no output schema, the description is too sparse. It does not explain how to discover refs, how to handle complex value encoding, or what the tool returns/does on error. Sibling tools provide some implied context, but the description alone leaves significant gaps for correct invocation.

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 by explaining parameter semantics. It mentions 'instance by ref' (ref) and 'property' (name) implicitly, and 'value' is referenced via coercion. But it does not explicitly define what ref is, how to obtain it, or how to construct valid value types. The schema itself lists types, but the description adds little semantic meaning beyond the action itself.

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 uses a specific verb and resource: 'Set a property on an instance by ref.' It clearly identifies the action (setting) and the target (a property of an instance). This distinguishes it from sibling tools like 'get_properties' and 'get_by_path', and there is no ambiguity about what the tool does.

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?

The description implies usage (when you need to set a property) but does not explicitly state when to use it versus alternatives or mention any exclusions. There is no guidance about prerequisite steps like obtaining a ref, though sibling tools like 'get_by_path' and 'get_root' likely provide refs. Usage context is inferable but not clearly articulated.

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