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set_fx_enabled

Enable or bypass specific FX plugins on tracks in REAPER projects. Control audio effects by toggling them on or off for precise mixing and editing.

Instructions

Enable or bypass (disable) a specific FX plugin on a track.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
track_indexYes
fx_indexYes
enabledYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • The MCP tool handler in server.py that defines and registers the 'set_fx_enabled' tool using the @mcp.tool decorator.
    def set_fx_enabled(track_index: int, fx_index: int, enabled: bool) -> dict[str, Any]:
        """Enable or bypass (disable) a specific FX plugin on a track."""
        try:
            return _wrap(
                adapter.set_fx_enabled(
                    track_index=track_index, fx_index=fx_index, enabled=enabled
                )
            )
        except Exception as exc:
            return _err(exc)
  • The wrapper method in ReaperAdapter that translates the MCP call into a BridgeClient RPC call to the REAPER bridge.
    def set_fx_enabled(
        self, track_index: int, fx_index: int, enabled: bool
    ) -> dict[str, Any]:
        return self._client.call(
            "set_fx_enabled", track_index=track_index, fx_index=fx_index, enabled=enabled
        )
Behavior3/5

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

With no annotations provided, the description carries the full burden. It clarifies that 'bypass' means disable, which is helpful domain terminology. However, it omits behavioral details like whether changes are immediate, idempotent, or what error conditions exist (e.g., invalid indices). No contradiction with annotations (none provided).

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?

Single sentence, front-loaded with the action. No redundant words. Appropriate length for the tool's scope.

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?

Adequate for a simple 3-parameter toggle operation, but gaps remain given 0% schema coverage. It does not leverage the existence of an output schema (mentioned in context) to explain what success returns, nor does it document the index numbering convention crucial for DAW APIs.

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 0% (no parameter descriptions). The tool description maps domain concepts to parameters implicitly: 'track' → track_index, 'FX plugin' → fx_index, 'Enable or bypass' → enabled. However, it fails to clarify critical semantics like whether indices are 0-based or 1-based, or what constitutes a valid fx_index.

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?

Clear specific verbs ('Enable or bypass') and resource ('FX plugin on a track'). Implicitly distinguishes from siblings like add_fx, remove_fx, and set_fx_param by focusing specifically on the enabled/bypass state, though it doesn't explicitly name alternatives.

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?

Provides no guidance on when to use this versus remove_fx (deletion) or set_fx_param (configuration). Does not mention that bypassing preserves the plugin in the chain while disabling processing, which is the key distinction from removal.

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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