How do I run Convert PDF to PNG with Codex MCP?

Codex can use medux_pdf_to_png through Medux MCP to render PDF pages as PNG images in a ZIP archive. The workflow identifies the exact inputs, reviews the tool arguments, monitors processing, and verifies the returned result.

Codex MCP tutorial · document

How to convert PDF pages to PNG with Codex MCP and Medux

Q: Which MCP tool does this tutorial use?

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

Use Codex and Medux through MCP to render PDF pages as PNG images in a ZIP archive. This guide covers input preparation, the approval gate, task monitoring, and a concrete output check.

POST/api/app/v1/process/asset/pdf_to_png

Convert PDF pages to PNG images (zip output).

Open the PDF to PNG API reference →

Codex-specific workflow

Run Convert PDF to PNG as a Codex MCP task

Use the active workspace as the source of truth. Ask Codex to identify the source PDF file ID, select medux_pdf_to_png, 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_pdf_to_png through Medux MCP to convert PDF pages to PNG.
First inspect and identify the source PDF file ID.
Show me the exact tool arguments before execution.
After the task completes, return the ZIP archive of PNG page images and verify that the archive contains every page as a readable PNG in the correct order.

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 ZIP archive of PNG page images. The final check is explicit: confirm that the archive contains every page as a readable PNG in the correct order.

What this tutorial does

Medux operation

Convert PDF pages to PNG images (zip output).

Agent workflow

Codex selects medux_pdf_to_png, 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.

Convert PDF pages to PNG images (zip output).

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_id`	string	Required	Input PDF file id.
`model_id`	string	Optional	Model Default: pdf-to-png-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_pdf_to_png 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 PDF to PNG

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_pdf_to_png 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_pdf_to_png
  ↓
Review inputs and approve the tool call
  ↓
Medux runs PDF to PNG
  ↓
Codex reports the response and output

Frequently asked questions

Can Codex use the Medux PDF to PNG API through MCP?

Codex can call the medux_pdf_to_png Medux MCP tool to convert PDF pages to PNG images (zip output). 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_pdf_to_png. Review its arguments before approval and consult the API reference for the current contract.