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Figma Edit MCP

by neozhehan

set_component_instance_property

Update a component instance property by setting boolean toggles, text overrides, instance swaps, or variant selections.

Instructions

Set a specific property value (boolean toggle, text override, instance swap, or variant selection) on an instance.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nodeIdYesThe ID of the instance node
nodeNameYesName of the instance node for verification
propertyNameYesThe human-readable name of the component property to change
valueYesThe new value for the property. For INSTANCE_SWAP properties, this must be a component key (the stable library identifier).
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 burden. It only states the action ('Set') but does not disclose any behavioral traits such as side effects, permissions required, or behavior on failure. For a mutation tool, this is insufficient.

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

Conciseness5/5

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

The description is a single, efficient sentence that immediately conveys the tool's purpose. No unnecessary words.

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

Completeness3/5

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

The tool has 4 required parameters and no output schema. The description covers the basic purpose but lacks details on return values, error conditions, or example usage. Adequate but not thorough.

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

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents all parameters well. The description adds minimal extra context by listing property types, but this could be inferred. Baseline of 3 is appropriate.

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

Purpose5/5

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

The description clearly states the verb 'Set' and the resource 'component instance property', listing the specific types of properties it handles (boolean toggle, text override, etc.). It distinguishes this from sibling tools like set_instance_overrides or manage_component_property by being focused on a single property.

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?

The description provides no guidance on when to use this tool versus alternatives such as set_instance_overrides or manage_component_property. An agent would need to infer usage from context.

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

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