Extract specific tshark fields with pagination.
AI agents call pm_extract_fields to retrieve information from PacketMaster without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads and retrieves specific fields from already-captured network packet data (PCAP files). It performs no write, destructive, execution of arbitrary commands, or financial operations. The extraction is a read-only query operation on passive network analysis data. Even in a network security context, extracting fields from packet captures is a standard, non-invasive analysis activity.
From the tool's definition Tool name 'pm_extract_fields' and description 'Extract specific tshark fields with pagination' indicate data retrieval from PCAP analysis without modification.
Attacks that exploit this kind of access
Extract specific tshark fields with pagination. It is categorised as a Read tool in the PacketMaster MCP Server, which means it retrieves data without modifying state.
Register the PacketMaster MCP server in PolicyLayer and add a rule for pm_extract_fields: 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 PacketMaster. Nothing to install.
pm_extract_fields 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 pm_extract_fields 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 pm_extract_fields. 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.
pm_extract_fields is provided by the PacketMaster MCP server (jctechbr/packetmaster). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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