Apply a Wireshark display filter to a pcap file and return a
AI agents call display_filter to retrieve information from Mcp Wireshark without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Display filtering in Wireshark is a read-only operation that narrows which packets are displayed for analysis. While it accesses network traffic data (which could be sensitive), it performs no writes, deletions, or code execution. Severity is medium because network packets may contain sensitive information, but the tool itself only retrieves/displays existing pcap data.
From the tool's definition Tool applies a Wireshark display filter to a pcap file and returns results. The verb 'filter' and context of packet capture analysis indicate data retrieval and querying operations without modifying or executing external commands.
Documented attack patterns abuse exactly the kind of access display_filter gives an agent:
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 display_filter:
{
"version": "1",
"default": "deny",
"tools": {
"display_filter": {}
}
}display_filter is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Apply a Wireshark display filter to a pcap file and return a. It is categorised as a Read tool in the Mcp Wireshark MCP Server, which means it retrieves data without modifying state.
Register the Mcp Wireshark MCP server in PolicyLayer and add a rule for display_filter: 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.
display_filter is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the display_filter 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.
Set action: deny in the PolicyLayer policy for display_filter. 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.
display_filter 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.
Start from Mcp Wireshark, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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13 Mcp Wireshark tools catalogued and risk-classified — across an index of 43,000+ MCP servers.