revoke_access_key

THE RISK

Critical Risk

Why revoke_access_key needs a policy

Revoking an access key is a destructive operation—once executed, the key cannot be restored without regeneration through other means, and it immediately and permanently blocks the key's ability to sign transactions.

From the tool's definition Tool description states 'Revoke an existing access key' which permanently disables an authentication credential.

Documented attack patterns abuse exactly the kind of access revoke_access_key gives an agent:

POLICY

How to control revoke_access_key

PolicyLayer is an MCP gateway — it sits between your AI agents and Tempo, and nothing reaches the server without passing your rules. This is the rule we recommend for revoke_access_key:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "revoke_access_key"
  ]
}

revoke_access_key disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register Tempo — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

Govern database agents → Read-only defaults, blocked table drops, and no DELETE without a WHERE clause on every query.
Critical-risk tools in Tempo → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about revoke_access_key

What does the revoke_access_key tool do? +

Revoke an existing access key. Revoked keys cannot be used for signing. It is categorised as a Destructive tool in the Tempo MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on revoke_access_key? +

Register the Tempo MCP server in PolicyLayer and add a rule for revoke_access_key: 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 Tempo. Nothing to install.

What risk level is revoke_access_key? +

revoke_access_key is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit revoke_access_key? +

Yes. Add a rate_limit block to the revoke_access_key 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 revoke_access_key completely? +

Set action: deny in the PolicyLayer policy for revoke_access_key. 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 revoke_access_key? +

revoke_access_key is provided by the Tempo MCP server (arome3/tempo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Tempo tool call.

Start from Tempo, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →