How do I run Merge Audio Files with Codex MCP?

Codex can use medux_merge_audio through Medux MCP to concatenate multiple audio files into one ordered track. The workflow identifies the exact inputs, reviews the tool arguments, monitors processing, and verifies the returned result.

Codex MCP tutorial · media

How to merge audio files with Codex MCP and Medux

Q: Which MCP tool does this tutorial use?

This workflow uses medux_merge_audio . Review its arguments before approval and consult the API reference for the current contract.

Use Codex and Medux through MCP to concatenate multiple audio files into one ordered track. This guide covers input preparation, the approval gate, task monitoring, and a concrete output check.

POST/api/app/v1/process/audio/merge_audio

Concatenate multiple audio files into one.

Open the Merge Audio API reference →

Codex-specific workflow

Run Merge Audio Files as a Codex MCP task

Use the active workspace as the source of truth. Ask Codex to identify the audio file IDs in the intended playback order, select medux_merge_audio, and keep the Medux task ID and returned output with the rest of the project. Naming the input roles and the expected result prevents an agent from guessing which file should be used where.

Codex prompt pattern

In this workspace, use medux_merge_audio through Medux MCP to merge audio files.
First inspect and identify the audio file IDs in the intended playback order.
Show me the exact tool arguments before execution.
After the task completes, return the merged audio file and verify that every source clip appears once in the correct order without missing transitions.

Approval gate

Before approving the call, compare the selected tool, file or asset IDs, ordering, timing, and output settings with the request. If a local filename was mapped to an uploaded Medux file ID, keep that mapping visible so it can be audited later.

Result verification

Let Codex monitor an asynchronous task until it reaches a terminal state, then save or report the merged audio file. The final check is explicit: confirm that every source clip appears once in the correct order without missing transitions.

What this tutorial does

Medux operation

Concatenate multiple audio files into one.

Agent workflow

Codex selects medux_merge_audio, presents the arguments for review, calls Medux, and reports the response.

Before you start

Authentication

Authentication is required via Authorization header.

Preconditions

Upload each source file and create file references before calling this endpoint.
Successful requests return a Medux task record immediately. Use the task query or sync endpoints to track completion.
All file inputs must be uploaded and persisted as file references before submission.

Prompt Codex

Start with a clear instruction that names the Medux operation and the intended inputs.

Concatenate multiple audio files into one.

Request fields to review

Confirm these values before approving the MCP tool call. The linked API page remains the source of truth for current limits and response semantics.

Field	Type	Requirement	Purpose
`input_file_ids`	array<string>	Required	Input audio file id list.
`model_id`	string	Optional	Model Default: merge-audio-default.
`title`	string	Optional	Optional task title.

Step-by-step workflow

Connect Medux MCP to Codex

Add the Medux remote MCP endpoint to Codex, provide an authorized credential, and confirm that the medux_merge_audio tool is available.

Prepare the required inputs

Prepare the source files, asset IDs, text, or settings required by the operation. Upload local media first when the tool requests file IDs.

Ask Codex to run Merge Audio

Use one direct instruction with the intended values. Codex should select the Medux tool and show the proposed arguments before execution.

Review and approve the tool call

Check that the tool is medux_merge_audio and that each file ID, task ID, option, and output setting matches your request before approving it.

Check the Medux response

If Medux returns an asynchronous task, let the agent monitor it until completion; otherwise review the immediate response and save any result identifiers or output URLs.

Workflow recap

User goal
  ↓
Codex selects medux_merge_audio
  ↓
Review inputs and approve the tool call
  ↓
Medux runs Merge Audio
  ↓
Codex reports the response and output

Frequently asked questions

Can Codex use the Medux Merge Audio API through MCP?

Codex can call the medux_merge_audio Medux MCP tool to concatenate multiple audio files into one. This guide covers the required inputs, approval flow, result handling, and the matching API reference.

Which MCP tool does this tutorial use?

This workflow uses medux_merge_audio. Review its arguments before approval and consult the API reference for the current contract.