Per-action credentials: how AI agents stay secure
Long-lived API keys in agent code are a breach waiting to happen. How short-lived, per-action credentials shrink the blast radius — and why it's the right default for AI agents.
Ask "what's the worst that happens if this AI agent leaks a credential?" The answer depends entirely on what kind of credential it holds. A long-lived API key is a disaster; a short-lived, narrowly-scoped token is a shrug. That's the case for per-action credentials.
The problem with long-lived keys
The convenient pattern — drop an API key in the agent's environment or prompt — puts a powerful, long-lived secret in the least predictable part of your system. AI agents process untrusted input and can be steered in unexpected ways; a key they hold can leak through a log, a prompt injection, or a bug, and then an attacker has broad access for as long as the key lives.
The fix: short-lived, per-action
Instead of the agent holding a key, the runtime mints a token per action, scoped to exactly that step and valid for a short window. The agent uses it, it expires. A leaked token bought an attacker almost nothing: one narrow capability, for minutes.
- Scoped — only the permissions that one action needs.
- Short-lived — expires fast; useless tomorrow.
- Never in agent code — the long-lived secret stays with the platform, not the model.
Why this matters more for agents
Traditional services run trusted code. Agents run model-generated decisions over untrusted input — a fundamentally less predictable setting. The credential model has to assume the agent could be steered wrong, and limit the damage. Per-action credentials are how you do that. They're one of the core guardrails and a standard line item in any compliance review.
The test
If an agent's credentials leaked right now, how much access did an attacker get, and for how long? With long-lived keys: a lot, indefinitely. With per-action credentials: a little, briefly. That difference is the whole point.
This is a default on Spikefrost, not an add-on — see the enterprise AI agents guide for the full security model.
Frequently asked questions
What are per-action credentials for AI agents?
Short-lived tokens minted for a single action and scoped to exactly what that action needs, instead of a long-lived API key the agent holds. They expire fast, so a leak is nearly worthless.
Why not just give the agent an API key?
A long-lived key in agent code or a prompt is a high-value, long-lived secret in an unpredictable place. If it leaks — via a log, an injection, or a bug — an attacker has broad, lasting access. Per-action credentials remove that.