start_js_coverage

Starts collecting JavaScript code coverage data. This tracks which parts of JavaScript code are executed.

SERVERJs Reverse SOURCE1600822305/js-reverse-mcp

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/1600822305-js-reverse-mcp/start-js-coverage.md

WHAT IT DOES

What start_js_coverage does on Js Reverse

AI agents invoke start_js_coverage to trigger actions in Js Reverse. 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 start_js_coverage is rated High

Code coverage collection is an observational Execute action - it instruments and monitors JavaScript execution within a controlled browser context via Chrome DevTools Protocol. While it doesn't modify code or data, it does trigger monitoring mechanisms and alter browser behavior to collect execution data. This is less severe than Write (no state changes) but more than Read (active instrumentation).

From the tool's definition The tool "starts collecting JavaScript code coverage data" which requires instrumenting and monitoring code execution within a browser context. Code coverage collection inherently involves executing and tracking JavaScript execution paths.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs start_js_coverage safely

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

start_js_coverage Rate-limited

start_js_coverage 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": {
    "start_js_coverage": {
      "limits": [
        {
          "counter": "start_js_coverage_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 Js Reverse, apply this rule, and every start_js_coverage call is checked against it from then on.

FAQ

Questions about start_js_coverage

What does the start_js_coverage tool do? +

Starts collecting JavaScript code coverage data. This tracks which parts of JavaScript code are executed. It is categorised as a Execute tool in the Js Reverse MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on start_js_coverage? +

Register the Js Reverse MCP server in PolicyLayer and add a rule for start_js_coverage: 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 Js Reverse. Nothing to install.

What risk level is start_js_coverage? +

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

Can I rate-limit start_js_coverage? +

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

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

start_js_coverage is provided by the Js Reverse MCP server (1600822305/js-reverse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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