How do I run AI Image Face Swap with Codex MCP?

Codex can use medux_image_face_swap through Medux MCP to transfer facial identity between images while preserving the target pose and lighting. The workflow identifies the exact inputs, reviews the tool arguments, monitors processing, and verifies the returned result.

Codex MCP tutorial · edit

How to swap faces in an image with Codex MCP and Medux

Q: Which MCP tool does this tutorial use?

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

Use Codex and Medux through MCP to transfer facial identity between images while preserving the target pose and lighting. This guide covers input preparation, the approval gate, task monitoring, and a concrete output check.

Watch the complete workflow: AI image face swap with Codex, MCP, and Medux.Watch on YouTube ↗

POST/api/app/v1/process/image/face_swap

Swap a face from one image onto another while keeping the target pose and lighting.

Open the Image Face Swap API reference →

Codex-specific workflow

Run AI Image Face Swap as a Codex MCP task

Use the active workspace as the source of truth. Ask Codex to identify the source face image and target image, with each role clearly assigned, select medux_image_face_swap, 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_image_face_swap through Medux MCP to swap faces in an image.
First inspect and identify the source face image and target image, with each role clearly assigned.
Show me the exact tool arguments before execution.
After the task completes, return the face-swapped image and verify that the intended face is transferred while the target pose, lighting, and broader head remain consistent.

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 face-swapped image. The final check is explicit: confirm that the intended face is transferred while the target pose, lighting, and broader head remain consistent.

Capability boundary: This tutorial targets image face swap: it transfers facial identity while preserving more of the target head, pose, and lighting. It is a separate capability from head swap, which replaces the broader head region.

What this tutorial does

Medux operation

Swap a face from one image onto another while keeping the target pose and lighting.

Agent workflow

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

Before you start

Authentication

Authentication is required via Authorization header.

Preconditions

Upload the source file and create a file reference 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.

Swap a face from one image onto another while keeping the target pose and lighting.

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
`source_image_file_id`	string	Required	Source image file id.
`target_face_image_file_id`	string	Required	Target face image file id.
`model_id`	string	Optional	Face swap model id. Default: image-face-swap-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_image_face_swap 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 Image Face Swap

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_image_face_swap 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_image_face_swap
  ↓
Review inputs and approve the tool call
  ↓
Medux runs Image Face Swap
  ↓
Codex reports the response and output

Frequently asked questions

Can Codex use the Medux Image Face Swap API through MCP?

Codex can call the medux_image_face_swap Medux MCP tool to swap a face from one image onto another while keeping the target pose and lighting. 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_image_face_swap. Review its arguments before approval and consult the API reference for the current contract.