export_json

THE RISK

Medium Risk

Why export_json needs a policy

This tool performs a reversible write operation that creates or overwrites a JSON file with exported packet data. It does not delete data (Destructive), execute arbitrary code (Execute), or involve financial transactions (Financial). While it modifies the filesystem, the impact is limited to creating an output file from already-captured network data.

From the tool's definition Tool description states 'Export packets from a pcap file to a JSON file at output_path' - this creates or modifies a file on the filesystem. The verb 'export' combined with explicit output file specification indicates file creation/writing.

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

POLICY

How to control export_json

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

policy.json

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

export_json 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 Mcp Wireshark — 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

Related tools and policies

More Mcp Wireshark tools

Execute protocol_stats Run a tshark Execute live_capture Capture live network traffic from an interface. Writes to a Read check_installation Check if Wireshark/tshark is installed and return version info. Read decode_protocol Extract protocol-specific fields from a pcap file using tshark Read display_filter Apply a Wireshark display filter to a pcap file and return a Read expert_info Run tshark expert analysis on a pcap file. Returns warnings, errors, Read follow_tcp Follow a TCP stream by index and return its ASCII payload. Read follow_udp Follow a UDP stream by index and return its ASCII payload.

All 13 Mcp Wireshark tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

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 export_json

What does the export_json tool do? +

Export packets from a pcap file to a JSON file at output_path. It is categorised as a Write tool in the Mcp Wireshark MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on export_json? +

Register the Mcp Wireshark MCP server in PolicyLayer and add a rule for export_json: 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 Wireshark. Nothing to install.

What risk level is export_json? +

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

Can I rate-limit export_json? +

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

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

export_json is provided by the Mcp Wireshark MCP server (khuynh22/mcp-wireshark). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Wireshark tool call.

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

CHECK YOUR STACK →