keyway_set_secret · Keyway MCP Server MCP: Risk & Policy

WHAT IT DOES

What keyway_set_secret does on Keyway MCP Server

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

WHY IT NEEDS A POLICY

Why keyway_set_secret needs a policy

This tool reversibly modifies secrets stored in a vault. While secrets are sensitive, Write is the correct classification because the operation is reversible (secrets can be updated/overwritten) and doesn't irreversibly delete data. Severity is high because misuse could inject malicious credentials into the vault, affecting authentication and authorization across systems relying on these secrets.

From the tool's definition Tool explicitly creates or updates a secret in the Keyway vault, modifying stored credentials. The description states 'Create or update a secret', which are Write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

keyway_set_secret Rate-limited

keyway_set_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": {
    "keyway_set_secret": {
      "limits": [
        {
          "counter": "keyway_set_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 Keyway MCP Server, so you can run agents against it safely.

FAQ

Questions about keyway_set_secret

What does the keyway_set_secret tool do? +

Create or update a secret in the Keyway vault. The key must be uppercase with underscores (e.g., DATABASE_URL). It is categorised as a Write tool in the Keyway MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on keyway_set_secret? +

Register the Keyway MCP Server MCP server in PolicyLayer and add a rule for keyway_set_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 Keyway MCP Server. Nothing to install.

What risk level is keyway_set_secret? +

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

Can I rate-limit keyway_set_secret? +

Yes. Add a rate_limit block to the keyway_set_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 keyway_set_secret completely? +

Set action: deny in the PolicyLayer policy for keyway_set_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 keyway_set_secret? +

keyway_set_secret is provided by the Keyway MCP Server MCP server (keywaysh/keyway-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.