How do I run Create a Presigned Upload URL with Claude MCP?

Claude can use medux_create_upload_url through Medux MCP to create a presigned upload URL and file reference for a direct client upload. The workflow keeps input roles and constraints in context, reviews the proposed call, and checks the returned result.

Claude MCP tutorial · get-started

How to create a presigned upload URL with Claude MCP and Medux

Q: Which MCP tool does this tutorial use?

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

Use Claude and Medux through MCP to create a presigned upload URL and file reference for a direct client upload. This guide keeps file roles and constraints in context, reviews the proposed call, and validates the returned result.

POST/api/app/v1/upload_urls

Create a pre-signed upload URL and file reference for a direct client upload.

Open the Create Upload URL API reference →

Claude-specific workflow

Run Create a Presigned Upload URL as a Claude MCP workflow

Keep the goal, source assets, and constraints together in the conversation. Ask Claude to restate the source filename, media type, and upload purpose before proposing medux_create_upload_url. That context checkpoint makes the file roles and desired outcome easy to correct before any Medux call is approved.

Claude prompt pattern

Using the assets and requirements in this conversation, help me create a presigned upload URL with Medux MCP.
Restate which input fulfills each role: the source filename, media type, and upload purpose.
Propose the medux_create_upload_url call and summarize its arguments before asking for approval.
When it finishes, return the upload URL and Medux file reference with a checklist confirming that the URL accepts the intended file and the returned file reference is saved for the next call.

Context checkpoint

Have Claude summarize the intended transformation, identify every source asset by role, and list the important constraints. Review that summary together with the proposed tool arguments; correct the conversation first if a file, order, time range, or setting is ambiguous.

Result verification

Keep the Medux task ID in the conversation while Claude checks progress. When processing ends, ask for the upload URL and Medux file reference plus a concise validation checklist confirming that the URL accepts the intended file and the returned file reference is saved for the next call.

What this tutorial does

Medux operation

Create a pre-signed upload URL and file reference for a direct client upload.

Agent workflow

Claude selects medux_create_upload_url, presents the arguments for review, calls Medux, and reports the response.

Before you start

Authentication

Authentication is required via Authorization header.

Preconditions

Try it is available after login because the returned upload target is account-scoped.
Use this as the first step in most Playground and agent flows.

Prompt Claude

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

Use Medux to run Create Upload URL. Review the required inputs, call medux_create_upload_url, wait for the result if a task is returned, and report the output clearly.

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
`extension`	string	Optional	File extension without a leading dot, such as mp4.
`media_type`	string	Optional	Media type used to validate the file extension and build the upload object path. Use a supported Medux media type and check the linked API reference for the current enum values.

Step-by-step workflow

Connect Medux MCP to Claude

Add the Medux remote MCP endpoint to Claude, provide an authorized credential, and confirm that the medux_create_upload_url 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 Claude to run Create Upload URL

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

Review and approve the tool call

Check that the tool is medux_create_upload_url 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
  ↓
Claude selects medux_create_upload_url
  ↓
Review inputs and approve the tool call
  ↓
Medux runs Create Upload URL
  ↓
Claude reports the response and output

Frequently asked questions

Can Claude use the Medux Create Upload URL API through MCP?

Claude can call the medux_create_upload_url Medux MCP tool to create a pre-signed upload URL and file reference for a direct client upload. 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_create_upload_url. Review its arguments before approval and consult the API reference for the current contract.