goclaw_custom_tool_update

THE RISK

Medium Risk

Why goclaw_custom_tool_update needs a policy

This tool creates or modifies data in a reversible manner (Write category). The severity is medium because updating custom tools could affect gateway behavior and downstream agent operations, but the action is reversible and doesn't trigger financial transactions, irreversible deletion, or arbitrary code execution. Confidence is high (0.9) as the name and description clearly indicate a write/update operation.

From the tool's definition Tool name 'goclaw_custom_tool_update' explicitly indicates modifying/updating an existing resource. Description confirms it 'Update[s] a custom tool', which is a reversible data modification operation.

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

POLICY

How to control goclaw_custom_tool_update

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

policy.json

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

goclaw_custom_tool_update 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 GoClaw 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.

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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 goclaw_custom_tool_update

What does the goclaw_custom_tool_update tool do? +

Update a custom tool. It is categorised as a Write tool in the GoClaw 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 goclaw_custom_tool_update? +

Register the GoClaw MCP Server MCP server in PolicyLayer and add a rule for goclaw_custom_tool_update: 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 GoClaw MCP Server. Nothing to install.

What risk level is goclaw_custom_tool_update? +

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

Can I rate-limit goclaw_custom_tool_update? +

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

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

goclaw_custom_tool_update is provided by the GoClaw MCP Server MCP server (nextlevelbuilder/goclaw-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every GoClaw MCP Server tool call.

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

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