vault_rotate_secret · RedisNexus MCP: Risk & Policy

WHAT IT DOES

What vault_rotate_secret does on RedisNexus

AI agents use vault_rotate_secret to create or update resources in RedisNexus — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your RedisNexus environment.

WHY IT NEEDS A POLICY

Why vault_rotate_secret needs a policy

This tool writes new secret values to a vault (KV v2), creating a new version. While it modifies sensitive credentials/secrets, it is a versioned write operation (not irreversible — old versions remain in KV v2). However, misuse could break dependent services by rotating secrets unexpectedly, making severity high. It fits Write rather than Destructive because the old version is preserved in KV v2.

From the tool's definition Rotate a secret by writing new values. Creates a new version in KV v2.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vault_rotate_secret Rate-limited

vault_rotate_secret stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "vault_rotate_secret": {
      "limits": [
        {
          "counter": "vault_rotate_secret_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches RedisNexus, so you can run agents against it safely.

FAQ

Questions about vault_rotate_secret

What does the vault_rotate_secret tool do? +

Rotate a secret by writing new values. Creates a new version in KV v2. It is categorised as a Write tool in the RedisNexus MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on vault_rotate_secret? +

Register the RedisNexus MCP server in PolicyLayer and add a rule for vault_rotate_secret: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches RedisNexus. Nothing to install.

What risk level is vault_rotate_secret? +

vault_rotate_secret is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit vault_rotate_secret? +

Yes. Add a rate_limit block to the vault_rotate_secret rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block vault_rotate_secret completely? +

Set action: deny in the PolicyLayer policy for vault_rotate_secret. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides vault_rotate_secret? +

vault_rotate_secret is provided by the RedisNexus MCP server (rajkumar-madhu/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.