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kicholiz

Figma Write Bridge MCP

by kicholiz

edit_component_property

Rename or update an existing Figma component property, including its default value and preferred values, to keep component definitions accurate.

Instructions

Rename or update the default value/preferred values of an existing component property.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nodeIdNo
updatesYes
componentIdNo
propertyNameYes
componentSetIdNo
preferComponentSetNo

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?

With no annotations, the description carries the full behavioral burden for a mutation tool. It implies a write but says nothing about required permissions, whether a rename propagates to instances/overrides, whether changes are reversible, or what happens to values not included in the update. Significant disclosure gap.

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 focused sentence with the action front-loaded and no filler. It is efficient, though its brevity is partly a consequence of under-specification rather than deliberate restraint.

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?

For a 6-parameter mutation tool with a nested updates object, no annotations, no output schema, and 0% schema description coverage, the description leaves too much unspecified. An agent cannot determine which identifier parameter to use or how the nested update payload is interpreted from this text alone.

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, yet it only loosely names three updatable fields (name, defaultValue, preferredValues) that live inside the nested 'updates' object. It never addresses propertyName, nodeId, componentId, componentSetId, or preferComponentSet, nor the type/key shape or COMPONENT/COMPONENT_SET enum.

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?

The description gives a specific verb ('rename or update') and resource ('an existing component property'), and it enumerates the editable facets (default value / preferred values). It does not explicitly distinguish itself from sibling tools like add_component_property, delete_component_property, or bind_component_property, 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?

The word 'existing' faintly implies this is for properties that already exist rather than creating them, but there is no explicit when-to-use guidance, no prerequisites, and no reference to alternatives such as add_component_property or delete_component_property. The agent is left to infer routing.

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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