What tools should I use to keep secrets away from AI agents?
Use a secrets manager to store, rotate, and lease credentials, then add an egress or credential proxy when the agent itself must never receive the secret value. A vault protects storage; a proxy protects the moment of use. Many production systems need both.
Surveyed 18 August 2026
Reviewed starting points
Direct links- 01Akeyless ↗
Managed identity-security and secrets platform with dynamic credentials, rotation, policy, audit, and agent-focused secretless access patterns.
Managed enterprise vault and short-lived credentials - 02Infisical ↗
Open-source secrets platform with machine identities, dynamic secrets, rotation, secret syncs, and an agent that injects secrets into workloads.
Open-source vault and application secret delivery - 03HashiCorp Vault ↗
Established secrets platform for policy-controlled storage, dynamic credentials, leases, revocation, encryption, and audit logs.
Infrastructure-scale dynamic secrets and PKI - 04Iron Proxy ↗
Default-deny egress proxy for untrusted workloads that swaps proxy tokens for real credentials only at the outbound boundary.
Agent sandboxes, coding agents, and CI egress control - 05Agent Vault Proxy ↗
Local open-source proxy that fetches credentials just in time from Bitwarden or Google Secret Manager and injects them into outbound requests.
Developer machines and local agent harnesses
Protect agent credentials
Open in Tools →What to look for
- 01Can the agent read the real credential from an environment variable, file, tool result, or error? If yes, storage is protected but agent use is not.
- 02Can each run receive a narrow, short-lived credential for one service and action instead of inheriting a developer or production key?
- 03Does the runtime enforce destination allowlists and outbound network policy? Secret injection without egress control can still authorize an attacker-chosen request.
- 04Can operators revoke one run, inspect who used which credential, and rotate the underlying secret without changing the agent prompt or code?
Common questions
- Why is putting an API key in an environment variable unsafe for an agent?
- The agent process can often read its environment directly or through generated code. A prompt injection can then copy the key into output, logs, a patch, or an outbound request. Environment variables hide secrets from source control, not from the process.
- What is the difference between a secrets manager and a credential proxy?
- A secrets manager stores, rotates, audits, and sometimes generates credentials. A credential proxy makes the authenticated request on the agent's behalf or injects the credential at the network boundary, so the agent never handles the real value.
- Is a credential proxy enough by itself?
- No. The agent also needs restricted filesystem access and default-deny egress. Otherwise it may read credentials from another location or bypass the proxy and send data directly to an attacker-controlled host.
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