syscall_stack_capture

SERVERJshookmcp SOURCE@jshookmcp/jshook

High RISK CLASS

Category Execute

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/syscall-stack-capture.md

WHAT IT DOES

What syscall_stack_capture does on Jshookmcp

AI agents invoke syscall_stack_capture to trigger actions in Jshookmcp. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why syscall_stack_capture is rated High

Executes live debugger queries and captures syscall events, triggering external runtime operations.

From the tool's definition captured syscall events, live CDP call stacks, debugger integration

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs syscall_stack_capture 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 syscall_stack_capture, this is the rule to start with:

syscall_stack_capture Rate-limited

syscall_stack_capture stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "syscall_stack_capture": {
      "limits": [
        {
          "counter": "syscall_stack_capture_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about syscall_stack_capture

What does the syscall_stack_capture tool do? +

Correlate captured syscall events with real JS call stacks via debugger integration. Goes beyond static heuristics by querying live CDP call stacks for syscall→JS mapping. Falls back to heuristic-only mode when no debugger is attached. It is categorised as a Execute tool in the Jshookmcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on syscall_stack_capture? +

Register the Jshook MCP server in PolicyLayer and add a rule for syscall_stack_capture: 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 syscall_stack_capture? +

syscall_stack_capture is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit syscall_stack_capture? +

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

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

syscall_stack_capture 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.

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