browse_knowledge_base

THE RISK

Low Risk

Why browse_knowledge_base needs a policy

This tool only performs directory listing and browsing operations, which are informational queries with no side effects. It does not create, modify, delete, execute code, or trigger external operations.

From the tool's definition Tool description states 'Browse the directory structure' and 'discover what topics and categories are available' - these are read-only operations that retrieve metadata about available resources without modifying or executing anything.

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

POLICY

How to control browse_knowledge_base

PolicyLayer is an MCP gateway — it sits between your AI agents and Bug Bounty MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for browse_knowledge_base:

policy.json

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

browse_knowledge_base 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 Bug Bounty MCP Server — 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

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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 browse_knowledge_base

What does the browse_knowledge_base tool do? +

Browse the directory structure of the bug bounty knowledge base. Use this to discover what topics and categories are available. It is categorised as a Read tool in the Bug Bounty MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on browse_knowledge_base? +

Register the Bug Bounty MCP Server MCP server in PolicyLayer and add a rule for browse_knowledge_base: 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 browse_knowledge_base? +

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

Can I rate-limit browse_knowledge_base? +

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

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

browse_knowledge_base is provided by the Bug Bounty MCP Server MCP server (r-s0n/rs0n-bug-bounty-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bug Bounty MCP Server tool call.

Start from Bug Bounty MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →