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save_fx_preset

Save current FX settings as a named preset to reuse plugin configurations across tracks in REAPER.

Instructions

Save the current FX settings as a preset.

Args: preset_name: Name for the new preset.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
fx_indexYes
preset_nameYes
track_indexYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.7.3

TDQS

C2.7/5.0
Behavior2/5

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

No annotations are provided, so the description bears the full burden. It does not say whether saving under an existing preset_name overwrites it (a destructive outcome), whether it fails or creates duplicates, or what the tool returns; for a write operation this is a significant omission.

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

Conciseness4/5

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

The description is short and front-loaded, with the core action stated first. The Args block adds little, but there is no filler or repetition.

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 3-required-parameter mutation tool with no annotations and no output schema, the description should at least explain the track/FX addressing and overwrite semantics. Neither is present, leaving the agent unable to invoke it confidently.

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 two of the three required parameters (track_index, fx_index) are never mentioned in the description. The only documented parameter, preset_name, is restated tautologically ("Name for the new preset"), adding nothing beyond the schema.

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?

"Save the current FX settings as a preset" gives a clear verb+resource and scope (current settings of an FX). It does not, however, differentiate itself from the sibling set_fx_preset/get_fx_presets, so an agent must infer the save-vs-apply split from the name alone.

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 indication of when to use this versus set_fx_preset (apply a stored preset) or get_fx_presets, nor any prerequisites such as the FX needing to exist on the referenced track. The agent must guess at context.

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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