curl_request

Execute a curl request to an external HTTP API.

SERVERMCP Filesystem Server SOURCEa-niranjan/mcp-filesystem

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/a-niranjan-mcp-filesystem/curl-request.md

WHAT IT DOES

What curl_request does on MCP Filesystem Server

AI agents invoke curl_request to trigger actions in MCP Filesystem Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why curl_request is rated High

This tool executes external HTTP requests, which can trigger side effects on remote systems depending on the request parameters (POST, PUT, DELETE operations). While it does not modify local filesystem directly, it performs external operations whose consequences depend entirely on the arguments provided—making it an Execute category risk.

From the tool's definition Tool name 'curl_request' combined with description 'Execute a curl request to an external HTTP API' indicates execution of arbitrary HTTP operations to external systems.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs curl_request safely

PolicyLayer is an MCP gateway: it sits between your AI agents and MCP Filesystem Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For curl_request, this is the rule to start with:

curl_request Rate-limited

curl_request stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "curl_request": {
      "limits": [
        {
          "counter": "curl_request_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect MCP Filesystem Server, apply this rule, and every curl_request call is checked against it from then on.

FAQ

Questions about curl_request

What does the curl_request tool do? +

Execute a curl request to an external HTTP API. It is categorised as a Execute tool in the MCP Filesystem Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on curl_request? +

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

What risk level is curl_request? +

curl_request is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit curl_request? +

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

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

curl_request is provided by the MCP Filesystem Server MCP server (a-niranjan/mcp-filesystem). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on MCP Filesystem Server, and thousands of servers like it.

This server

All 17 MCP Filesystem Server tools → High-risk tools on this server →

Across the catalogue

http_request on 0sec → All high-risk MCP tools → The MCP Attack Database →

Guides

Govern code and CI agents →Agent sandbox →Least privilege for MCP →