js_load

THE RISK

Low Risk

Why js_load needs a policy

This tool retrieves and ingests a local CSV manifest file. It does not modify, delete, or execute operations—it simply reads structured data from the user's file system into the Burp Suite integration. The action is non-destructive and has no external side effects, fitting the 'Read' category as a data retrieval operation.

From the tool's definition Tool name is 'js_load' and description indicates it loads a manifest file produced by the JS Exporter. The verb 'load' combined with reading a CSV manifest file denotes retrieval of data with no side effects.

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

POLICY

How to control js_load

PolicyLayer is an MCP gateway — it sits between your AI agents and Burp Mcp Plus, and nothing reaches the server without passing your rules. This is the rule we recommend for js_load:

policy.json

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

js_load 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 Burp Mcp Plus — 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

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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 js_load

What does the js_load tool do? +

Load a _manifest.csv produced by the JS Exporter side of the user's. It is categorised as a Read tool in the Burp Mcp Plus MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on js_load? +

Register the Burp Mcp Plus MCP server in PolicyLayer and add a rule for js_load: 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 Burp Mcp Plus. Nothing to install.

What risk level is js_load? +

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

Can I rate-limit js_load? +

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

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

js_load is provided by the Burp Mcp Plus MCP server (titaniumtushar/burp-mcp-plus). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Burp Mcp Plus tool call.

Start from Burp Mcp Plus, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →