How to manage many client Facebook ad accounts with Claude or ChatGPT

Step 1: get access the way Meta expects

The client goes to their business portfolio settings → Partners and shares the ad account with yours, or you request it. To give a partner access to your business portfolio, they must have their own business portfolio. Access can be full or partial; partial access to an ad account is split into tasks such as “Manage campaigns” and “View performance” (source). For a one-off audit, temporary access runs from 3 to 75 days.

Ask for “View performance” if you only report, and “Manage campaigns” if you change campaigns. The connector inherits exactly that. Step-by-step screens are in our guide to agency access.

The limits you will meet

The last row matters most with an assistant. Meta’s documentation says Rate limiting is at the ad account level, so one busy client doesn’t block another — but reporting is also limited across the whole app, so asking for “last month for all 30 clients” at once is the request most likely to be slowed down (source). A good connector queues it and caches what it already read.

Step 2: tell the assistant which client

When several ad accounts are connected, the assistant has to pick one for every request. Neither Meta, OpenAI nor Anthropic describes how assistants choose, and a guess on the wrong client is the mistake that costs trust. Make it explicit:

1. Start with the list. Meta’s own first example request is “List my ad accounts.” Check that every client is there and named the way you call them.
2. Name the client in each request: “For Smile Dental: which ad sets got more expensive this week?”
3. Before any change, read the account name in the preview. If it’s not the client you meant, cancel.

Questions that should cover everyone — “Which of my clients have rejected ads?” — are fine across all accounts, as long as the answer is for you, not for a client.

Step 3: keep each client’s data apart

Meta’s policy for tools that buy ads on behalf of others is direct:

Keep Meta's data that you maintain on behalf of one advertiser separately from that of other advertisers.

It also says Don't combine multiple end advertisers or their Meta business assets in the same ad account. Written for apps, it is a sound rule for any agency using AI, because a chat remembers what it saw:

• One project per client. In ChatGPT, projects with project-only memory mean Chats cannot reference conversations outside the project (source). Claude projects keep their own memory too.
• Cross-client summaries stay internal. A table of all clients is for your team; a client gets a report about their account only.
• Don’t paste one client’s results into another client’s chat as a benchmark.

From 3 February 2027 Meta’s developer policy also lets an advertiser ask an ad-buying service to disclose its Meta spend separately from its fees, the fee structure and the campaign settings (source). If you resell media through your own tool, plan for it.

Step 4: decide who can change what

Permissions sit in three places, and the strictest one wins:

• Meta — the tasks the client gave your portfolio, and the people in your portfolio you assigned to each account. Meta advises keeping full control to ideally 10 or fewer people and removing people who haven’t logged in for 90 days (source).
• The assistant workspace. On Claude Team and Enterprise, owners set each tool to always allow, needs approval or blocked, and individual users can’t override it (source). On ChatGPT Business, Only admins and owners can create and publish plugins for custom MCP servers for a Business workspace. (source)
• The connector. Whether changes need a preview and a confirmation, and whether spend increases need a person.

If you build your own app on Meta’s MCP server for client accounts, Meta asks agencies to request Advanced Access to the ads_mcp_management permission, and lets you set agent controls across many ad accounts at once (source).

A weekly routine that works

1. Monday, all clients: “Which accounts spent nothing yesterday, have rejected ads or failed payments?” — one pass, internal only.
2. Per client: “Last week against the week before: spend, leads, cost per lead, and what changed.” Then the CRM view if you have it: leads that became sales.
3. Write the client report from that answer, in the client’s project (a template).
4. Changes go through previews you approve, one client at a time.
5. New client: run the audit checklist before touching anything.

How Variafy handles many accounts

Variafy connects your Meta login to ChatGPT, Claude and other assistants and lists every ad account your portfolio owns or was given by clients, with the tasks each one allowed.

• Each request names its account. When several are connected, an operation needs the account, and a confirmed change runs only on the account it was previewed for.
• Some reports cover everyone at once: revenue by account and rejected or limited ads are read account by account and summed up in one answer, each account with its own guard against Meta’s limits and its own cache.
• Briefs by email on a schedule cover every connected account and go only to people with access to it.

Managing many client accounts? Tell us how many accounts you work with in the form.

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Related guides

• How to give an agency access to your Facebook ad account
• Facebook ads report for clients: what to send every week
• AI agent for Facebook ads: what it is, what it can do and what to keep for yourself