brave_web_search

THE RISK

Low Risk

Why brave_web_search needs a policy

This tool retrieves search results from the web without creating, modifying, deleting, or executing operations. It is a read-only information retrieval function with minimal risk even if misused by an AI agent, as it cannot alter system state or access restricted data beyond what the search API returns.

From the tool's definition Tool name 'brave_web_search' and description 'Performs a web search using the Brave Search API' indicate a query/retrieval operation with no data modification or side effects.

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

POLICY

How to control brave_web_search

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP-Brave-Search, and nothing reaches the server without passing your rules. This is the rule we recommend for brave_web_search:

policy.json

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

brave_web_search 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 MCP-Brave-Search — 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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All 59 MCP-Brave-Search 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 brave_web_search

What does the brave_web_search tool do? +

Performs a web search using the Brave Search API, ideal for general queries, news, articles, and online content. It is categorised as a Read tool in the MCP-Brave-Search MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on brave_web_search? +

Register the MCP-Brave-Search MCP server in PolicyLayer and add a rule for brave_web_search: 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 MCP-Brave-Search. Nothing to install.

What risk level is brave_web_search? +

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

Can I rate-limit brave_web_search? +

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

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

brave_web_search is provided by the MCP-Brave-Search MCP server (modelcontextprotocol/servers-archived). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP-Brave-Search tool call.

Start from MCP-Brave-Search, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →