decode_protocol

THE RISK

Low Risk

Why decode_protocol needs a policy

The tool extracts and parses protocol-specific information from pcap files, which is a read operation that queries packet data. However, severity is elevated to 'medium' rather than 'low' because network packet analysis can expose sensitive information (credentials, API keys, personal data in unencrypted traffic), creating moderate risk if an agent misuses it to exfiltrate sensitive network intelligence from packet…

From the tool's definition Tool name 'decode_protocol' and description 'Extract protocol-specific fields from a pcap file using tshark' indicates data retrieval from packet captures without modification or execution of external commands.

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

POLICY

How to control decode_protocol

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 decode_protocol:

policy.json

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

decode_protocol 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 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 →

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 decode_protocol

What does the decode_protocol tool do? +

Extract protocol-specific fields from a pcap file using tshark. 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 decode_protocol? +

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

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

Can I rate-limit decode_protocol? +

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

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

decode_protocol 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 →