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williamcorrea23

AndroidBuilder MCP Server

update_component_property

Update a component's property (e.g., Text, Width) by specifying screen, component, property name, and new value. Works with multiple strategies in Designer view.

Instructions

Updates a property of a component. Uses 3 strategies in order: (1) GWT BlocklyPanel_setComponentProperty API, (2) top-frame API (iframe-hosted IDEs), (3) DOM input field in the Properties sidebar. Requires Designer view.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
propNameYesProperty name (e.g. Text, BackgroundColor, Width)
propValueYesNew value
screenNameYesScreen that owns the component (e.g. Screen1)
componentNameYesTarget component name (e.g. Button1)
Behavior3/5

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

With no annotations, the description carries the full burden. It discloses the three strategies and the order, which is valuable. However, it lacks details on error handling, side effects, or what happens if a strategy fails. The mutation nature demands more transparency.

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 extremely concise: two sentences that front-load the action and then provide the strategy details. Every sentence earns its place with no fluff.

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?

Given the tool is a mutation operation with 4 required parameters and no output schema, the description is incomplete. It does not mention return values, error conditions (e.g., invalid component name), or success indicators. The strategies are listed but not explained in enough depth to guide an agent.

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 coverage is 100%, so the baseline is 3. The description adds examples for propName (Text, BackgroundColor, Width) but does not elaborate on constraints or behavior beyond what the schema provides. It offers marginal added value.

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 it updates a property of a component, listing three specific strategies, and explicitly mentions the requirement for Designer view. This distinguishes it from sibling tools like get_component_properties, which only retrieves properties.

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

Usage Guidelines4/5

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

The description provides contextual usage guidance by stating the requirement for Designer view and the order of strategies. However, it does not explicitly state when not to use this tool or suggest alternatives for cases like not being in Designer view.

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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