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bbernstein

LacyLights MCP Server

by bbernstein

stop_cue_list

Stop the currently playing cue list in LacyLights to halt active lighting cues immediately. Use this to end cue playback and regain manual control.

Instructions

Stop the currently playing cue list

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv1.7.0

TDQS

B3.4/5.0
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, and it discloses only the mutation itself. It does not say whether stopping resets the cue position, whether playback state persists, what happens if no cue list is playing (error vs no-op), or how the lighting output is left.

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?

A single sentence with the imperative verb front-loaded and the scoping qualifier immediately after. There is no filler, and every word carries meaning.

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?

For a zero-parameter control action with no annotations and no output schema, this is only minimally complete: the agent knows what it does but not the resulting state or failure modes. A brief clause on post-stop behavior would close the gap.

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 tool takes zero parameters and schema coverage is 100%, so there is nothing for the description to disambiguate; the baseline of 4 applies. No additional parameter meaning is needed or provided.

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+resource ('stop' + 'cue list') and narrows scope with 'currently playing', which intuitively separates it from start_cue_list and delete_cue_list. It stops short of naming those siblings, so differentiation is implied rather than explicit.

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

Usage Guidelines3/5

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

The phrase 'currently playing' implies the precondition (an active cue list must exist), which is useful implicit usage guidance. However, no alternatives are named (start_cue_list, fade_to_black, go_to_cue) and there is no guidance on what to do if nothing is playing.

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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