gateway_set_credential · Claude Team MCP: Risk & Policy

WHAT IT DOES

What gateway_set_credential does on Claude Team MCP

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

WHY IT NEEDS A POLICY

Why gateway_set_credential needs a policy

This tool writes sensitive credential data to a secure vault file. While it modifies data (Write category), the severity is high because: (1) credentials are security-sensitive assets whose compromise could enable unauthorized access, (2) misuse by an untrusted agent could store attacker-controlled credentials, and (3) incorrect credential storage could disrupt legitimate team operations.

From the tool's definition Tool description states "Store a secret in the hub vault (a separate, chmod-600 file)". The action of storing/writing credentials to secure storage is a reversible Write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

gateway_set_credential Rate-limited

gateway_set_credential 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": {
    "gateway_set_credential": {
      "limits": [
        {
          "counter": "gateway_set_credential_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 Claude Team MCP, so you can run agents against it safely.

FAQ

Questions about gateway_set_credential

What does the gateway_set_credential tool do? +

Store a secret in the hub vault (a separate, chmod-600 file). Targets reference. It is categorised as a Write tool in the Claude Team MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on gateway_set_credential? +

Register the Claude Team MCP server in PolicyLayer and add a rule for gateway_set_credential: 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 Claude Team MCP. Nothing to install.

What risk level is gateway_set_credential? +

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

Can I rate-limit gateway_set_credential? +

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

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

gateway_set_credential is provided by the Claude Team MCP server (lakshan12367/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.