pcapng_write

SERVERJshookmcp SOURCE@jshookmcp/jshook

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-vmoranv-jshookmcp/pcapng-write.md

WHAT IT DOES

What pcapng_write does on Jshookmcp

AI agents use pcapng_write to create or update resources in Jshookmcp, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Jshookmcp environment.

RISK

Why pcapng_write is rated Medium

Creates network packet capture files reversibly; side effects limited to file creation without destroying or executing code.

From the tool's definition Write a PCAPNG capture file from one or more interfaces and packet records.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs pcapng_write safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Jshookmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For pcapng_write, this is the rule to start with:

pcapng_write Rate-limited

pcapng_write 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.

View as policy code

policy.json

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

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Jshookmcp, apply this rule, and every pcapng_write call is checked against it from then on.

FAQ

Questions about pcapng_write

What does the pcapng_write tool do? +

Write a PCAPNG (pcap-ng) capture file from one or more interfaces and deterministic packet byte records. Emits a Section Header Block, an Interface Description Block per interface, and an Enhanced Packet Block per packet. It is categorised as a Write tool in the Jshookmcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pcapng_write? +

Register the Jshook MCP server in PolicyLayer and add a rule for pcapng_write: 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 Jshookmcp. Nothing to install.

What risk level is pcapng_write? +

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

Can I rate-limit pcapng_write? +

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

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

pcapng_write is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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