Connect Codex to n8n

Connect Codex to n8n in 3 steps: 1. Sign in to ApexGenius and connect n8n. 2. Add the ApexGenius plugin. 3. Start using n8n in Codex. Start in Plugins in the ChatGPT desktop app and authorize your connection.

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How to connect n8n to Codex

1Sign in to ApexGenius and connect n8n
2Add the ApexGenius plugin to Codex
3Start using n8n in Codex

1
Connect n8n to ApexGenius
n8n connected
n8n shows as connected in ApexGenius, with what your AI can reach.
2
Connect ApexGenius to Codex
Choose Codex
Back on Start, pick Codex and copy the prompt.
3

Approve access
ApexGenius opens its approval page. Review the access, then approve.

Then ask Codex

List up to five n8n workflows. Do not run or change any workflow.

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Written setup, step by stepShow

Before you start

A reachable n8n instance and an API key for that instance.

1. Connect n8n to ApexGenius

Open n8n in Connections. Sign in to ApexGenius, open Connections, choose n8n, and select Connect.
Enter the instance credentials. Provide the n8n instance URL and API key in the connection form. Save the connection after validation succeeds.
Check the available tools. Open the Tools tab and use the Read filter to review the available inspection tools before using workflow authoring or execution actions.
Check the saved connection. Use Test connection and read the reported status before asking your AI to list workflows.
This captured n8n connection reports ready. Check your own connection and its latest validation before using tools.Open full-size image (opens in a new tab)

Connect n8n →

2. Connect ApexGenius to Codex

In the desktop app, open Settings, then MCP servers and Add server.
Name the server ApexGenius, choose Streamable HTTP, and paste the MCP address above.
Save, then select Restart. Choose Authenticate for ApexGenius and complete the browser sign-in.
When ApexGenius asks what this AI client may use, choose Read only for the first test, or Custom to limit it to the tools you need.
Start a new conversation and select ApexGenius from the available tools before asking for live data.

Official Codex setup instructions ↗

Watch the setup

Follow each step at your own pace.

Codex desktop app with Plugins selected and ApexGenius listed under Available to your account. — Open Codex in the ChatGPT desktop app, then Plugins, and find ApexGenius.Open full-size image (opens in a new tab)

Step 1 of 4Open Plugins

The walkthrough uses the original ChatGPT web plugin captures. After connecting, open Codex in the desktop app and start a new task with ApexGenius. A ChatGPT web connection does not verify Codex access.

A public ApexGenius plugin listing is not verified. Use a plugin shared with you or one you created, subject to your account and workspace policy.

OpenAI Plugins guide Full Codex setup guide

Create a personal plugin

Where Developer mode is available, open ChatGPT Settings, then Security and login, and enable it. In Plugins, select the plus button, enter ApexGenius and a description, then add this URL under Connection. Create the connection, complete OAuth, and review the tools. Return to Codex in the desktop app and start a new task with the plugin enabled.

https://server.autom8.pro/mcp

OpenAI custom connection guide

No plugin available? Use desktop settings

In the ChatGPT desktop app, open Settings, then MCP servers, then Add server.
Name the server ApexGenius, choose Streamable HTTP, and paste the MCP address below.
Save, select Restart, then Authenticate. Sign in to ApexGenius and authorize the intended connections and access.
Start a new Codex task and ask one read-only question. Check the returned result and its matching successful read in Activity.

https://server.autom8.pro/mcp

OpenAI desktop MCP settings

Manual setup for developers

Codex CLI is optional. Run these commands, complete browser authorization, then start a new session. Do not paste bearer tokens or static authorization headers.

codex mcp add apexgenius --url https://server.autom8.pro/mcp

Authorize in your browser

codex mcp login apexgenius

Inspect registered servers

codex mcp list

The desktop app, CLI, and IDE extension share MCP configuration on the same host. The IDE extension does not install plugins. ChatGPT web does not read local Codex configuration.

3. Verify one safe read

List up to five n8n workflows. Do not run or change any workflow.

List up to five n8n workflows. Do not run or change any workflow.

Compare the workflow names and active status with the same n8n instance. A test execution can trigger downstream actions, so begin with a list request.

Full guide: the n8n setup guide.

What it looks like in Codex

Illustration of a task, not a recorded customer result. Your answers come from the account and dates you choose.

How the route works

CodexApexGenius MCP route

Which n8n workflows are turned on right now?

Working with ApexGenius1 tool search · 2 reads

RequestActive workflows

Account scopeAuthorized connections checked

apex_search_toolsn8n workflows · Find the n8n read pathComplete

apex_call_read_tooln8n_list_workflows · List active workflowsComplete

apex_call_read_tooln8n_get_workflow · Read each triggerComplete

Nine workflows are active. Four run on a schedule, five on webhooks. The newest is the lead intake workflow, changed two days ago. Nothing was changed.

Read-only route

Codex

Try asking

Audit my workflows for broken nodes and missing credentials.

Find a template for routing form submissions into Salesforce.

Show the last failed executions and explain the common cause.

Update the webhook node on the intake workflow.

What Codex can do in n8n

20 operations: 9 read, 11 write. Read looks things up and changes nothing. Writes change n8n and run only when you turn them on.

Workflows and executions

3 read · 1 write

n8n_list_workflowsread
List minimal workflow metadata with cursor pagination.
n8n_get_workflowread
Read a workflow at minimal, details, structure, or full detail.
n8n_executionswrite
Get, list, or delete workflow execution records.
n8n_audit_instanceread
Audit the instance and workflows for security, credential, webhook, and retention risks.

Nodes and templates

5 read

n8n_search_nodesread
Search n8n nodes by keyword, with optional template examples.
n8n_get_noderead
Read node details, documentation, properties, versions, and migrations.
n8n_validate_noderead
Validate a node configuration in minimal or full mode.
n8n_search_templatesread
Search workflow templates by keyword, nodes, task, metadata, or pattern.
n8n_get_templateread
Read a template as nodes only, structure, or a full workflow.

Build and validate

1 read · 3 write

n8n_validate_workflowread
Validate workflow nodes, connections, and expressions by workflow ID.
n8n_create_workflowwrite
Create an inactive workflow from supplied nodes and connections.
n8n_generate_workflowwrite
Generate workflow proposals from a description and optionally deploy a confirmed proposal.
n8n_deploy_templatewrite
Deploy a template from n8n.io and apply supported automatic fixes.

Change, run, and recover

7 write

n8n_update_workflowwrite
Apply incremental operations to a live workflow.
n8n_replace_workflowwrite
Replace a workflow with a complete nodes-and-connections definition.
n8n_autofix_workflowwrite
Preview or apply supported fixes for common workflow validation errors.
n8n_test_workflowwrite
Trigger an eligible webhook, form, or chat workflow and its real downstream actions.
n8n_workflow_versionswrite
List, read, restore, delete, prune, or truncate workflow version history.
n8n_manage_datatablewrite
Create, read, update, upsert, or delete n8n data tables and rows.
n8n_delete_workflowwrite
Permanently delete a workflow.

You choose the access. When you approve Codex, pick Full access, Read only, or Custom.

The connection belongs to the user and is not tied to a Salesforce connection.

Read, write, destructive, and open-world tool hints come from the current gateway catalog.

A test run can trigger real downstream actions such as email or third-party API calls.

Turn a tool off to block calls. Enabled tools run when called.

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Questions about connecting Codex to n8n

Updated August 26, 2026.

How do I connect Codex to n8n?

Connect Codex to n8n through ApexGenius in three steps. Sign in to ApexGenius and connect n8n with your n8n instance URL and an API key. Add ApexGenius to Codex. Then open a task in Codex and ask a question about your n8n. Start with a read, so nothing changes.

Is there a n8n MCP server for Codex?

Yes. ApexGenius is an MCP server that Codex connects to once. It carries your n8n connection and 20 n8n operations, so Codex does not need a separate n8n integration or plugin. You set it up one time and add each agent the same way.

What can Codex do in n8n once it is connected?

Codex can run 20 n8n operations through ApexGenius: 9 reads that list workflows, inspect them and their nodes, search templates, and validate and audit the instance, and 11 writes that create, generate, deploy, update, run and delete workflows and manage execution records and data tables.

Can Codex read my n8n workflows?

Yes, on the n8n instance you connect with its URL and an API key. Self-hosted or cloud both work if the instance is reachable and the key is valid. The connected n8n account decides what Codex can reach. ApexGenius stores the credential, so it is not left in an agent config.

Can Codex change my n8n?

Not until you enable those tools. Read tools return workflow detail and change nothing. Tools that overwrite or remove are marked destructive and run when enabled. A test run can trigger real downstream actions such as email or API calls, so start with a list request.

Can I use the same n8n connection with Claude, ChatGPT, Grok Bot or Muse?

Yes. One n8n connection in ApexGenius works with every compatible agent you add, including Claude, ChatGPT, Grok Bot or Muse. Each agent gets its own access choice and its own short setup, so you can pick read only for one agent and more for another.