"Credential sprawl" is the unglamorous risk that quietly grows the moment you run more than one AI agent. It is not a hack. It is the slow accumulation of secrets in too many places, held by too many programs, with no clear map of who can do what. The AI-agent era makes it worse, fast.

What credential sprawl actually is

Every API key, OAuth token, and password you create is a credential. Sprawl is what happens when those credentials get copied — into config files, agents, scripts, environment variables, notes, and chats — until no one can answer two simple questions: where does this key live? and what can it touch?

For years this was a slow, human problem. Now you have agents creating and consuming credentials at machine speed.

Why AI agents make it worse

  1. You spin up more agents than you'd ever hire people. Each one needs access to something — and the easy move is to give it the keys you already have.
  2. The lazy default is the dangerous one. Pasting one master key into every agent is the path of least resistance, and it means every agent can do everything.
  3. Agents are unpredictable. A human won't paste your key into a malicious site by accident at 3am. An agent following an injected instruction might.
  4. There's rarely an audit trail. When something looks wrong, you can't tell which agent did it, because they all share the same identity.

The result: your blast radius — the damage one leaked credential can do — grows to the sum of every key, times every agent that holds it.

How to shrink the blast radius

The fix is not "use fewer agents." It is to make each credential small and accountable:

  • One credential per agent, never a shared master key.
  • Scope each credential to the single capability the agent needs.
  • Keep the real secrets in one place you control, not scattered across configs.
  • Make revocation one action so a problem agent can be cut instantly.
  • Keep an audit trail so every action traces to a specific agent.

Do that, and a leaked credential is a contained incident instead of a company-wide one.

The cleanest way to get all five at once is a local credential broker. Agent Master Key holds your real keys on your own Mac and issues each agent a scoped, revocable Master Key — so there's one place your secrets live, every agent has its own identity, and you can revoke any of them in a click. Sprawl, solved by design.

Bottom line

Credential sprawl is the tax you pay for moving fast with agents — unless you architect against it. Give each agent its own scoped, revocable key and keep your real secrets in one controlled place. For the practical how-tos, see how to store API keys for AI agents safely and how to revoke an AI agent's access.