gau_discovery · Bug Bounty MCP Server MCP: Risk & Policy

WHAT IT DOES

What gau_discovery does on Bug Bounty MCP Server

AI agents invoke gau_discovery to trigger actions in Bug Bounty MCP Server. 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.

WHY IT NEEDS A POLICY

Why gau_discovery needs a policy

This tool executes Gau, a command-line utility that performs external reconnaissance by querying multiple sources to enumerate URLs. While discovery itself is read-like, the tool's primary function is to run/execute an external scanning operation, which classifies it as Execute.

From the tool's definition Tool description: 'Run Gau to discover URLs from multiple sources with logging.' The verb 'Run' indicates execution of an external tool (Gau, a known OSINT/reconnaissance utility).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

gau_discovery Rate-limited

gau_discovery 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": {
    "gau_discovery": {
      "limits": [
        {
          "counter": "gau_discovery_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Bug Bounty MCP Server, so you can run agents against it safely.

FAQ

Questions about gau_discovery

What does the gau_discovery tool do? +

Run Gau to discover URLs from multiple sources with logging. It is categorised as a Execute tool in the Bug Bounty MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on gau_discovery? +

Register the Bug Bounty MCP Server MCP server in PolicyLayer and add a rule for gau_discovery: 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 Bug Bounty MCP Server. Nothing to install.

What risk level is gau_discovery? +

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

Can I rate-limit gau_discovery? +

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

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

gau_discovery is provided by the Bug Bounty MCP Server MCP server (slanycukr/bugbounty-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.