OneCLI vs HashiCorp Vault

The comparison comes up because both products live in the "secrets" aisle. But they answer different questions. Vault answers: where do secrets live, who can read them, and how do they rotate? OneCLI answers: what happens in the moment an AI agent needs to use one?

That moment is where agents break the usual model. A service that reads a secret from Vault is code you wrote and reviewed. An agent is a language model improvising with tools: it logs what it sees, sends context to an LLM provider, and can be talked into revealing things via prompt injection. Handing it a secret, from any vault, makes the secret part of the attack surface.

How they differ

HashiCorp Vault

The model

Built for

onecli

Controlling AI agent access to external APIs

HashiCorp Vault

Storing, issuing, and rotating infrastructure secrets

You are not picking between two secrets managers. You are picking which layer each tool owns.

What the agent holds

onecli

A placeholder (onecli-managed). The real key never enters the agent's process or context.

HashiCorp Vault

The secret itself, after fetching it via API, Vault Agent, template, or env

This is the line that matters for prompt injection. A key the agent never holds is a key it cannot leak.

Where enforcement happens

onecli

At the network layer: a proxy injects the key per request

HashiCorp Vault

At read time: policies govern who can fetch which secret

Read-time policy cannot see what happens after the fetch. Network-layer policy sees every call the agent makes.

Runtime control

Per-request policy

onecli

Allow, block, require approval, or rate limit each API call

HashiCorp Vault

Not in scope: once fetched, usage is up to the holder

Agents make thousands of calls. The dangerous one is a specific request, not a specific secret read.

Human-in-the-loop

onecli

Yes: hold sensitive requests for approval, per rule

HashiCorp Vault

Control Groups gate secret access, not API calls

Refunds, deletes, and sends get a human gate without pausing everything else the agent is doing.

Audit trail

onecli

Every proxied request: host, method, verdict

HashiCorp Vault

Every secret read and lease event

A read log tells you what was fetched, not what was done with it. Incident review needs the second part.

Operations

Dynamic secrets and leasing

onecli

No

HashiCorp Vault

Yes, first-class: databases, cloud creds, PKI

Short-lived infrastructure credentials are Vault's home turf. OneCLI does not try to compete there.

Agent framework support

onecli

Anything that makes HTTP calls: one proxy env var

HashiCorp Vault

Framework-agnostic, but the consumer still handles the secret

A proxy variable is the whole integration. No SDK migration, no per-framework plugins.

License and deployment

onecli

Open source; local binary or Docker, plus a cloud dashboard

HashiCorp Vault

Source-available (BUSL 1.1); self-hosted cluster or HCP

Your security team can read every line of the code that touches your keys.

The gap a vault leaves open

Vault is excellent at its job. But its job ends when the secret is handed over. Vault Agent can render a key into an env var or a file for you, and from that point the process holds it: readable by the code, loggable, and visible to anything that can read the environment. For deterministic services that is a reasonable risk. For an LLM-driven agent it means the key can end up in context windows, traces, or a cleverly prompted reply.

OneCLI closes exactly that gap. The agent sends requests through the gateway with a placeholder, the gateway injects the real key into the outgoing call, and policies decide whether the call happens at all. What a credential vault can and can't do for agent security goes deeper on this boundary.

When to use which

Using both

This is not an either-or choice. Vault stays the source of truth for your infrastructure. OneCLI sits at the boundary where agents meet the internet: add the API keys agents need to OneCLI's encrypted store (or resolve them from a connected password manager like 1Password or Bitwarden), point the agent at the proxy, and the rest of your secret management stays exactly as it is. Agents get access. Nothing else changes.

Common questions