set-api-key

THE RISK

Medium Risk

Why set-api-key needs a policy

This tool modifies persistent authentication credentials, which is a reversible write operation that affects system configuration. The severity is high because a compromised API key could be used to make unauthorized requests to the Climatiq API, potentially incurring charges, accessing sensitive emissions data, or degrading service availability.

From the tool's definition Tool name 'set-api-key' and description 'Set the Climatiq API key for authentication' indicate this tool creates or modifies configuration state by storing an API key.

Documented attack patterns abuse exactly the kind of access set-api-key gives an agent:

POLICY

How to control set-api-key

PolicyLayer is an MCP gateway — it sits between your AI agents and Climatiq MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for set-api-key:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set-api-key": {
      "limits": [
        {
          "counter": "set-api-key_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

set-api-key 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.

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

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about set-api-key

What does the set-api-key tool do? +

Set the Climatiq API key for authentication. This allows the server to make authorized requests to the Climatiq API. It is categorised as a Write tool in the Climatiq 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 set-api-key? +

Register the Climatiq MCP Server MCP server in PolicyLayer and add a rule for set-api-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 Climatiq MCP Server. Nothing to install.

What risk level is set-api-key? +

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

Can I rate-limit set-api-key? +

Yes. Add a rate_limit block to the set-api-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 set-api-key completely? +

Set action: deny in the PolicyLayer policy for set-api-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 set-api-key? +

set-api-key is provided by the Climatiq MCP Server MCP server (jagan-shanmugam/climatiq-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Climatiq MCP Server tool call.

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

CHECK YOUR STACK →