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Jelloeater

ulanzi-mcp

switch_to_app

Switch the active app on your Ulanzi smart pixel clock to a specified app name, like Time or Temperature.

Instructions

Switch to a specific app.

Args: app_name: Name of the app to switch to (e.g., 'Time', 'Date', 'Temperature', 'Humidity', 'Battery', or custom app name) clock_index: Optional index of clock to target (0-based). Defaults to first clock.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
app_nameYes
clock_indexNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

No annotations are provided, and the description does not disclose behavioral traits like mutability, permissions, or side effects. The minimal statement leaves agents uninformed about important operational details.

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, front-loading the purpose in one sentence, followed by clear parameter documentation. No superfluous 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?

While the description covers the basic action and parameter details, it omits potential failure modes, state changes, or interaction effects with sibling tools. Given the tool's simplicity and the existence of an output schema (not shown), a score of 3 is appropriate.

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

Parameters4/5

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

The description adds significant value beyond the schema by specifying examples for app_name and clarifying the optional nature and default of clock_index. This compensates for the schema's 0% description coverage.

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 'Switch' and the resource 'a specific app', effectively distinguishing it from sibling tools like next_app/previous_app which cycle through apps.

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 guidance on when to use this tool versus alternatives such as next_app or previous_app. The description lacks explicit context for usage selection.

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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