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OSC MCP Server

OSC MCP Server

by anteriovieira
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Hybrid

osc_set_fader

Adjust channel fader levels on Behringer X32 or Midas M32 digital mixers by setting specific values from 0.0 to 1.0 for precise audio control.

Instructions

Set the fader level for a channel (0.0 to 1.0)

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": {
      "channel": "<channel>",
      "level": "<level>"
    },
    "name": "osc_set_fader"
  }
}

Input Schema

NameRequiredDescriptionDefault
channelYesChannel number (1-32)
levelYesFader level (0.0 = -∞dB, 0.75 = 0dB, 1.0 = +10dB)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

C2.9/5.0
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. It implies a write/mutation operation ('Set') but doesn't disclose behavioral traits like required permissions, whether changes are immediate or reversible, potential side effects, or error conditions. The description adds minimal context beyond the basic action.

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 front-loads the core action and includes essential range information. There is zero wasted text, making it easy to parse and understand quickly.

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 no annotations and no output schema, the description is incomplete for a mutation tool. It lacks information about return values, error handling, or system context (e.g., how this interacts with the mixer or emulator status from sibling tools). The minimal description leaves significant gaps for the agent to operate effectively.

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 description coverage is 100%, with clear documentation for both parameters (channel number range and fader level mapping). The description adds no additional parameter semantics beyond what the schema provides, such as explaining the relationship between 'channel' and other tools or clarifying the dB mapping further. Baseline 3 is appropriate when schema does the heavy lifting.

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 the fader level') and target resource ('for a channel'), with a specific range (0.0 to 1.0) that adds precision. However, it doesn't explicitly differentiate from sibling tools like 'osc_set_aux_fader' or 'osc_set_bus_fader', which perform similar fader-setting operations on different channel types.

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 is provided on when to use this tool versus alternatives. With many sibling tools for setting faders on different channel types (e.g., aux, bus, main), the description lacks context about its specific application, prerequisites, or exclusions, leaving the agent to infer usage from the name alone.

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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