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Codex· OpenAI’s coding agent

Your ModuleX workflows, on call for Codex. Publish once; Codex calls them from its sessions.

api.modulex.dev/mcp/servestreamable HTTPmx_mcp_key via X-API-Key

Publish your MCP serverView the MCP docs
codex · modulex mcpconnected
  • › tools/list
  • inbound_lead_routing · workflow
  • grounded_support_replies · workflow
  • files · knowledge · built-in
  • › tools/call inbound_lead_routing
  • run started · metered in credits

Four steps, one key. Publish once in ModuleX, paste one block into Codex, and the tools are live.

  1. 01Publish a serverIn Settings › ModuleX MCP, choose what it exposes: workflows, Files, Knowledge. Paid plan; owner or admin.
  2. 02Copy the keyOne mx_mcp_ key, shown once. Rotation issues a replacement.
  3. 03Add the configPoint the client at your private endpoint. The exact snippet is below.
  4. 04Ask from the clientTools appear on the next list. Calls are metered in credits; listing is free.
codex · mcp config · toml
[mcp_servers.modulex]
url = "https://api.modulex.dev/mcp/serve/{server_id}"
env_http_headers = { "X-API-Key" = "MODULEX_MCP_KEY" }
tool_timeout_sec = 180
export MODULEX_MCP_KEY='mx_mcp_...'

Replace the endpoint placeholder with your server URL from the Overview tab, and do not add an X-Organization-ID header; the MCP endpoint does not use one. Full client guide in the docs

Workflows, Files, Knowledge. That is what Codex sees; each with a name, description, and input schema.

Workflow toolsEvery deployed workflow you publish becomes a tool with its name, description, and input schema.
FilesList, read, write, and append organization Files.
KnowledgeList your Knowledge bases and run retrieval over them.

The 179-integration catalog is not published directly: Codex calls one tool, the workflow does the cross-tool work. Browse the integrations

ModuleX MCP at a glance. Straight from the docs.

Endpointhttps://api.modulex.dev/mcp/serve/{server_id}
TransportStreamable HTTP (stateless JSON-RPC over POST)
AuthenticationX-API-Key (or Authorization: Bearer)
Key prefixmx_mcp_
Publish fromSettings › ModuleX MCP
RequiresPaid plan; owner or admin publishes
Servers per organization20
Keys per server / org10 / 50
Published tools per server100
Concurrent tool calls10
Key lifetimeup to 365 days
BillingTool calls consume credits like in-app runs; listing tools is free

Workflows teams expose first. Build one from a sentence, deploy it, and it becomes a tool Codex can call.

Daily Inbox DigestEvery morning your team gets a clean digest of overnight email in Notion, without opening the inbox. A ModuleX agent reads the unread threads, summarizes them, and files a dated page in your Notion database.5 steps · weekdays 8amInbound Lead RoutingNew leads get scored the moment they arrive and the hot ones land in #sales while your reps are still at their desks. A ModuleX agent rates buying intent, posts the strong leads to Slack, and files every contact in HubSpot.5 steps · on every new leadFailed Payment Follow-upA failed invoice stops being a silent number on a dashboard and becomes a tracked case your team can act on. When Stripe reports a payment failure, a ModuleX agent pulls the details, re-sends the invoice, and posts the case to Slack.6 steps · on payment failure

Also connects toClaude CodeCursorHermesOpenClaw

ModuleX MCP and Codex.

  • Not directly. ModuleX MCP publishes your deployed workflows, Files, and Knowledge as tools, not the third-party integration catalog. The workflows themselves are what act across the tools your organization has connected.

Codex plans. Your workflows execute.

Publish your MCP serverRead the MCP docs

Workflows to build firstThe tools they act across

Codex is OpenAI’s product. ModuleX is an independent MCP server and is not affiliated with or endorsed by OpenAI.