read_pcap

THE RISK

Low Risk

Why read_pcap needs a policy

This tool queries and retrieves network packet data from capture files for analysis purposes. It has no capability to modify files, execute code, delete data, or commit financial transactions. The analysis is performed on already-captured data, making this a straightforward Read category operation with low severity risk.

From the tool's definition Tool name 'read_pcap' and description 'Read and analyze packets from a .pcap or .pcapng file' indicate data retrieval without modification or execution of external commands. The verb 'read' and 'analyze' are passive operations on static packet capture files.

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

POLICY

How to control read_pcap

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 read_pcap:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "read_pcap": {}
  }
}

read_pcap is read-only, so it stays allowed — but 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.

CAP 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 Write export_json Export packets from a pcap file to a JSON file at output_path. 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.

All 13 Mcp Wireshark tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about read_pcap

What does the read_pcap tool do? +

Read and analyze packets from a .pcap or .pcapng file. Returns a. It is categorised as a Read tool in the Mcp Wireshark MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on read_pcap? +

Register the Mcp Wireshark MCP server in PolicyLayer and add a rule for read_pcap: 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 read_pcap? +

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

Can I rate-limit read_pcap? +

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

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

read_pcap 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 →