Claude may not do something during the X3 setup

Area: Claude and MCP · Updated: 31 Oct 2026 · Auf Deutsch · All articles

Symptoms

  • Claude gets „Locked during the X3 setup session: keys are managed by the person in X3, never by Claude.“ (or the same for ad accounts, reporting, proxy, lead setup, deleting).
  • The API answers 409 setup_session_locked.

Cause

  • During a setup with Claude (setup_session_start) some steps are locked on that project: keys, ad accounts, reporting, lead setup without dry run, deleting. The person does them in X3 so nothing happens without them.

How to fix it

1. Do the step yourself in the dashboard

  • In the dashboard: Einstellungen, then the locked step (e.g. Einstellungen › Werbekonten & Budget › Werbekonto verbinden)
  • With Claude (MCP): No MCP tool (exactly these steps are not allowed for Claude during the setup)

2. Propose the lead setup instead of applying it

  • In the dashboard: Onboarding › Anfragen festlegen
  • With Claude (MCP): lead_setup_propose {"project":"my-shop","items":[{"id":"g_kontaktformular","role":"lead"}]}

During the setup Claude proposes, the person confirms in X3.

3. Finish the setup

  • In the dashboard: Onboarding › Claude richtet X3 ein › Den Rest mache ich selbst
  • With Claude (MCP): setup_session_finish {"project":"my-shop"}

After the end the connection's normal permissions apply again.

How to tell it worked

  • The step is done in X3, setup_status shows it as done.