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set_parameter

Set a single parameter value on a Houdini node by specifying its path, parameter name, and new value. Use this to control node settings in a live session.

Instructions

Set a single parameter value on a node.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
valueYes
node_pathYes
parm_nameYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.7/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full behavioral burden, and it discloses almost nothing: no statement about permissions, whether the change triggers a cook, type coercion of the value, error behavior on an invalid node path, or reversibility. Only the word 'single' hints at the mutation scope.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single front-loaded sentence with no filler. It is efficient, though its brevity is achieved partly by omitting information rather than by tight editing.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With zero annotation coverage, zero schema descriptions, and a mutation of scene state, the definition is too thin: an agent cannot reliably construct a valid call or predict side effects. The existence of an output schema only removes the need to explain return values, which is a small relief.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

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 for three undocumented parameters. It implies node_path and parm_name loosely ('a node', 'a parameter'), but gives no path syntax, no parm naming/index conventions, and no indication of accepted value types.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb+resource ('Set a single parameter value on a node') and the word 'single' implicitly distinguishes it from the sibling set_parameters. It does not explicitly name that sibling or explain the distinction, so it falls short of a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No when-to-use guidance, no prerequisites, and no mention of the obvious alternative (set_parameters for multiple values). The agent must infer the use case from the name alone.

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