v8_type_profile

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/v8-type-profile.md

WHAT IT DOES

What v8_type_profile does on Jshookmcp

AI agents invoke v8_type_profile 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 v8_type_profile is rated High

Controls V8 runtime profiling session, triggering external browser/engine operations.

From the tool's definition start or stop V8 type profiling via CDP Profiler

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs v8_type_profile 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 v8_type_profile, this is the rule to start with:

v8_type_profile Rate-limited

v8_type_profile 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": {
    "v8_type_profile": {
      "limits": [
        {
          "counter": "v8_type_profile_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 v8_type_profile call is checked against it from then on.

FAQ

Questions about v8_type_profile

What does the v8_type_profile tool do? +

Atomic primitive: start or stop V8 type profiling via CDP Profiler.startTypeProfile() / takeTypeProfile() / stopTypeProfile(). Type profiles record the runtime types flowing through each function entry (type:Array, type:Object, type:number, ...) — the raw material for deobfuscating VM dispatchers or polymorphic call sites. action=. 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 v8_type_profile? +

Register the Jshook MCP server in PolicyLayer and add a rule for v8_type_profile: 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 v8_type_profile? +

v8_type_profile is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit v8_type_profile? +

Yes. Add a rate_limit block to the v8_type_profile 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 v8_type_profile completely? +

Set action: deny in the PolicyLayer policy for v8_type_profile. 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 v8_type_profile? +

v8_type_profile 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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