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OSC MCP Server

OSC MCP Server

by anteriovieira
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Hybrid

osc_set_main_fader

Adjust the main stereo output volume level on digital mixers like Behringer X32 or Midas M32 by setting a fader value between 0.0 and 1.0.

Instructions

Set the main LR fader level

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "level": "<level>"
    },
    "name": "osc_set_main_fader"
  }
}

Input Schema

NameRequiredDescriptionDefault
levelYesFader level (0.0 to 1.0)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.1/5.0
Behavior2/5

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

No annotations are provided, so the description carries full burden for behavioral disclosure. While 'Set' implies a write/mutation operation, the description doesn't specify whether this requires special permissions, has side effects, affects audio output immediately, or has any rate limits. This leaves significant behavioral uncertainty for an agent.

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 gets straight to the point with zero wasted words. It's appropriately sized for a simple tool with one parameter and follows good front-loading principles.

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 single-parameter mutation tool with no annotations and no output schema, the description provides basic purpose but lacks important context about behavioral implications, usage distinctions from similar tools, and expected outcomes. The high schema coverage helps, but more behavioral context would be needed for full completeness.

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?

The input schema has 100% description coverage with clear documentation of the 'level' parameter (range 0.0-1.0). The description doesn't add any additional parameter semantics beyond what's already in the schema, so it meets the baseline expectation when schema coverage is complete.

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 clearly states the action ('Set') and the target resource ('main LR fader level'), making the purpose immediately understandable. However, it doesn't explicitly differentiate from sibling tools like 'osc_set_fader' or 'osc_set_main_pan', which would require more specific context about what makes the 'main LR fader' distinct.

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. With many sibling tools available (like osc_set_fader, osc_set_aux_fader, osc_set_bus_fader), there's no indication of when this specific tool is appropriate versus other fader-setting tools or related controls like pan settings.

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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