reexpress_add_ood

THE RISK

Low Risk

Why reexpress_add_ood needs a policy

The description is completely empty, making it impossible to determine what this tool does with confidence. Based on the naming convention of sibling tools (reexpress_add_true, reexpress_add_false), this likely adds an 'out-of-distribution' (OOD) label or example to a dataset, which would be a Write operation.

From the tool's definition Tool name: reexpress_add_ood — description is empty and uninformative.

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

POLICY

How to control reexpress_add_ood

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "reexpress_add_ood": {
      "limits": [
        {
          "counter": "reexpress_add_ood_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

reexpress_add_ood gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register Reexpress 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.

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Reexpress MCP Server tools

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All 9 Reexpress MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about reexpress_add_ood

What does the reexpress_add_ood tool do? +

reexpress_add_ood. It is categorised as a Other tool in the Reexpress MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on reexpress_add_ood? +

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

What risk level is reexpress_add_ood? +

reexpress_add_ood is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit reexpress_add_ood? +

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

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

reexpress_add_ood is provided by the Reexpress MCP Server MCP server (reexpressai/reexpress_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 Reexpress MCP Server tool call.

Start from Reexpress 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 →