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Echo722

reaper-mcp-bridge

by Echo722

set_fx_enabled

Enable or bypass a track's FX at a given index, letting you control whether that effect processes audio during mixing or editing.

Instructions

Bypass / enable an FX on a track.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
enabledYes
fx_indexYes
track_indexYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.2.0

TDQS

C2.4/5.0
Behavior2/5

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

No annotations are supplied, so the description carries the full behavioral burden, and it discloses almost nothing: it does not say whether the change is reversible, whether it affects audio immediately during playback, what happens with an out-of-range index, or how 'bypass' relates to the 'enabled' boolean. For a state-mutating tool with zero annotation coverage, this is a significant gap.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

It is a single short sentence with no padding and the resource is front-loaded, which is good. But the length here reflects under-specification rather than disciplined conciseness, and the 'Bypass / enable' slash wording adds ambiguity rather than clarity.

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?

For a three-parameter mutation tool with no annotations, no output schema, and no parameter descriptions, the description is far too thin. An agent cannot determine index conventions, indexing source, or the effect of the boolean from anything provided.

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

Parameters2/5

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

Schema description coverage is 0% and the description does not compensate: it never explains track_index, fx_index, or whether indices are zero-based and how to obtain them. The only hint is that the FX lives on a track, which is already implicit in the required parameters. Two of three parameters remain completely undocumented in both schema and description.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose3/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a verb (set/bypass/enable) and a resource (an FX on a track), which is enough to place it among the FX siblings add_fx, remove_fx, list_fx, and set_fx_param. However, the slash construction 'Bypass / enable' is ambiguous: it is unclear whether the tool toggles the current state or writes an absolute state, even though the schema exposes a boolean 'enabled'. Sibling differentiation is weak but inferable.

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?

There is no guidance on when to use this tool versus the alternatives (add_fx, remove_fx, set_fx_param, list_fx), no prerequisites stated, and no note that indices must first be obtained from list_fx or list_tracks. The agent is left to infer the entire usage context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.