collect_code

THE RISK

Low Risk

Why collect_code needs a policy

This tool retrieves and observes JavaScript code from a running page—a read operation with no side effects on the target system. However, severity is elevated to 'medium' rather than 'low' because collected code may contain sensitive logic, API keys, authentication tokens, or proprietary algorithms. An agent could exfiltrate intellectual property or credentials.

From the tool's definition Tool name 'collect_code' and description 'Collect JavaScript code from a page' indicates retrieval of code artifacts. The phrase 'smart modes (summary/priority/incremental/full)' indicates configurable querying/sampling without modification.

Documented attack patterns abuse exactly the kind of access collect_code gives an agent:

POLICY

How to control collect_code

PolicyLayer is an MCP gateway — it sits between your AI agents and JS Reverse Strong MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for collect_code:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "collect_code": {}
  }
}

collect_code is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register JS Reverse Strong MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More JS Reverse Strong MCP tools

Destructive delete_session_state Delete one in-memory session snapshot by sessionId. Destructive remove_hook Remove a hook by id. Execute evaluate_on_callframe Evaluates a JavaScript expression in the context of a specific call frame while paused. Th Execute inject_preload_script Register a JavaScript snippet that will run on future document loads before page scripts e Execute navigate_page Navigates the currently selected page to a URL, or performs back/forward/reload navigation Execute new_page Creates a new page and navigates to the specified URL. Waits for DOMContentLoaded event (n Execute stop_monitor Stops an event monitor. Execute wait_for_element Wait for selector to appear.

All 85 JS Reverse Strong MCP tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about collect_code

What does the collect_code tool do? +

Collect JavaScript code from a page with smart modes (summary/priority/incremental/full). It is categorised as a Read tool in the JS Reverse Strong MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on collect_code? +

Register the JS Reverse Strong MCP server in PolicyLayer and add a rule for collect_code: 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 Strong MCP. Nothing to install.

What risk level is collect_code? +

collect_code is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit collect_code? +

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

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

collect_code is provided by the JS Reverse Strong MCP server (lwjjike/jsreverser-strong-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every JS Reverse Strong MCP tool call.

Start from JS Reverse Strong MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →