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Connect Codex to T3 Code

Codex reaches T3 Code through one Flowplane address. You add T3 Code once in Flowplane, add that address to Codex, and sign in. Look at your T3 Code projects and coding threads, and start, steer or interrupt a thread, with your approval first by default.

Connect T3 Code →Set up your assistant
Tools
The app’s own set
Sign-in
Own account or shared key
Approval, by default
Changes wait for you
MCP server
The app’s, passed through
  1. 1

    Add T3 Code in Flowplane

    In the Flowplane console, add T3 Code and type the address where `t3 serve` answers. At a public address, press Sign in with T3 Code; for a T3 on your machine or network, choose a tunnel and paste the access token.

    How you log in depends on where your T3 Code answers. At a public https address you sign in on T3 Code’s own page and approve read and operate access only; T3 gives no renewal, so you sign in again when it ends. A T3 on your machine or network is reached through a tunnel with an access token you issue on the T3 host (`t3 auth session issue`, read and operate scopes only, 30 days by default) and paste. Flowplane keeps it sealed; the assistant never sees it.

    Connect T3 Code →

  2. 2

    Add Flowplane to Codex

    Your address is shown in the Flowplane console; it looks like

    https://mcp.flowplane.eu/<your-label>

    1. Add the server with the first command below.
    2. Sign in with the second: your browser opens Flowplane; sign in and allow Codex.
    3. In the IDE extension: MCP servers › Add server, choose Streamable HTTP, paste https://mcp.flowplane.eu/<your-label>, then Authenticate.
    codex mcp add flowplane --url https://mcp.flowplane.eu/<your-label>
codex mcp login flowplane

    Steps checked against the vendor’s documentation (OpenAI)

  3. 3

    Ask Codex

    • “Which of my threads in the website project are still running?”
    • “Read the last messages of the thread about the login bug and tell me where it got stuck.”
    • “Start a thread in the api project: fix the failing date test, and touch nothing else.”
    • “Tell the billing thread to also add a test for refunds.”
    • “Interrupt the thread that is refactoring the search module.”
What it can do

What Codex can do in T3 Code

T3 Code is an open-source control surface for the coding agents on your own machines, such as Codex and Claude Code, served by `t3 serve`. Through Flowplane an AI assistant can list your projects, the machines linked to your T3 server and your threads, and read one thread. It can start a thread, send a message to one and interrupt one, which waits for your approval by default, because each of those runs or stops a coding agent on your machine.

T3 Code has its own MCP server: every T3 server answers MCP at `<address>/mcp`. Flowplane passes that server through, but offers only seven of its tools: finding projects, linked machines and threads, reading a thread, and starting, sending to and interrupting one. Nothing else T3 lists is stored or forwarded.

FAQ

Questions

What can the assistant do on my machine?
Starting a thread or sending to one runs a coding agent on that machine, with whatever rights T3 Code gives it there. That is why both wait for your approval by default, and the approval shows the full request, including the machine and the mode the agent runs in. Keep them on approval unless the machine is one you can lose.
Does one connection reach all my machines?
Yes. Every tool can name one of the machines linked to your T3 server, reads included, so the connection reaches all of them. To keep a machine out, do not link it to that T3 server, or have reads wait for approval too.
What is left out?
Everything except the seven tools: deleting projects, secrets, environments, previews, worktrees and settings are never offered, and neither is waiting on a thread; the assistant reads the thread again instead.
Does Codex see the password or key for T3 Code?
No. You sign in to T3 Code through Flowplane, which keeps that sign-in sealed. Codex only gets a Flowplane sign-in for you, which you can revoke in the console.
Can Codex change things in T3 Code without asking?
Not by default: reads are allowed and anything that changes something in T3 Code waits for your approval. Your workspace’s rules can make that stricter or looser.
Your assistant

Other assistants with T3 Code

Everything about T3 Code and Flowplane →

Flowplane is not affiliated with or endorsed by T3 Code’s maker; the name and logo only identify the app. Pricing

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