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What is a credential broker for AI agents?
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In short
A credential broker for AI agents is a trusted intermediary that lets an agent use a credential's capability without ever holding the raw, long-lived secret.
The agent requests an action; the broker checks policy — which workspace, which service, which operation — then either performs the call with the credential or issues a short-lived, narrowly scoped stand-in, and returns a result the agent can safely see. Storage stays in your vault; the broker governs use. Outloop's implementation of this pattern is called an agent access router.
The industry is converging on this name
Through 2026, three independent voices arrived at the same pattern under the same name. An IETF draft — Credential Broker for Agents (CB4A) (Hartman, March 2026) — specifies that agents should never hold real long-lived credentials, receiving instead "short-lived, narrowly scoped, auditable proxy credentials issued by a broker." A companion SANS essay (May 2026) frames agents as "the newest, and potentially the most dangerous confused deputies" in cloud environments. And the Cloud Security Alliance (May 2026) describes an "ephemeral credential broker model" with short-TTL agent credentials.
How the pattern works
Every credential-broker design shares three moves: the agent requests rather than holds; a policy decision runs per request (which workspace, which service, which action); and the raw long-lived secret never reaches the agent. Designs differ on the last step: CB4A-style brokers issue short-lived proxy credentials to the agent; Outloop's broker goes one step further and performs the action itself, returning only a redacted, non-secret result — the agent receives no credential in any form.
A brokered request: action in, redacted result out
- 01
Agent request
The agent asks for an approved action or alias — not a raw key.
- 02
Policy & tenant check
Outloop checks project, tenant identity, and runtime policy before anything runs.
- 03
Local broker
On approval, the local broker uses the credential on the wire to perform the call.
- 04
Redacted result
The agent receives a sanitized, non-secret result. Raw values never enter its context.
- 05
Audit log
Every attempt is written to a redacted local audit — decision, tenant, service.
The agent never sees the credential. A wrong-tenant request is denied at the policy check, before any backend call.
Broker vs vault — different layers, both needed
A vault answers "where is the secret stored?" A broker answers "may this agent use it — here, now, for this action?" Keep your vault (1Password, Keychain, Infisical, Doppler — see bring your own vault); the broker sits above it, reading host-side at request time. The distinction in one page: Outloop is not a vault.
Outloop's implementation: an agent access router
Outloop applies the broker pattern to the operator's reality — agents working across many client workspaces on a local machine. It adds the tenant dimension the enterprise drafts mostly skip: per-workspace grants, wrong-client use blocked by policy before any backend call, and a redacted local audit of every attempt. The broader layer it belongs to is agent runtime access.
Outloop is in commercial beta (controlled design-partner prep), verified on the founder's Mac; Apple signing/notarization and second-machine reproduction are still in progress. See the security model.
The broker pattern, built for multi-client agent teams.
Outloop is accepting qualified AI agencies, operators, and dev shops into commercial beta.
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