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PostFader V10 — FL Studio MCP Server

fl_route_channel_to_mixer

Destructive

Assign a global channel to a mixer track and verify the routing, with optional guards to prevent conflicting writes.

Instructions

Set one global channel's absolute mixer destination and verify it.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
channel_indexYesGlobal channel index.
expected_beforeNoOptional guarded channel fingerprint/destination.
mixer_destinationYesAbsolute mixer destination; -1 leaves it unassigned.
session_fingerprintNoOptional bridge/project-session fingerprint from a recent read. The write refuses after bridge reload or a reported project load. This is a concurrency guard, not authentication or a durable project identity.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
afterYes
beforeYes
verifiedYes
warningsNo
applied_atYes
index_scopeNoglobal
channel_indexYes
project_savedNo
bridge_commandNochannel.route_to_mixer
schema_versionNo1.0
undo_point_createdNo
verification_basisNoreadback_on_a_later_fl_idle_tick
session_fingerprintNo
verification_summaryYes
expected_before_appliedNo
requested_mixer_destinationYes
session_precondition_appliedNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv10.0.0

TDQS

B3.3/5.0
Behavior3/5

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

The annotations already carry destructiveHint=true and readOnlyHint=false, and the description does not contradict them. The added 'verify it' hints at a post-write check but does not explain what verification entails, what side effects occur, or what happens to the previous routing. A minimal but not misleading disclosure.

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?

One sentence with zero filler. The core action and object are front-loaded, and every word contributes to understanding what the tool does.

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?

The schema provides the guardrails and parameter docs, and annotations cover safety, so the description is not dangerously incomplete. However, it does not explain operational semantics such as what verification means, when guards are needed, or what happens on a mixed route failure. For a 4-parameter destructive route tool, more operational context would be expected.

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%, and the parameters already document 'global channel index', 'absolute mixer destination', the expected_before guard, and session_fingerprint meaning. The description mostly paraphrases the schema rather than adding new parameter-level semantics.

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 names the action (Set), the resource (one global channel), and what is being changed (absolute mixer destination), plus a verification step. It does not explicitly distinguish from sibling tools like fl_set_channel_mix or fl_set_mixer_send, so it misses full differentiation.

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 about when to use this tool versus alternatives, no mention of prerequisites, and no explanation of how the optional expected_before or session_fingerprint guards should guide invocation. The agent is left to infer usage context from the schema 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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