search_web

THE RISK

Low Risk

Why search_web needs a policy

This tool only retrieves and queries publicly available web information without creating, modifying, or deleting any data. It performs a search operation which is inherently non-destructive and non-mutative. The low severity reflects minimal risk of misuse by an AI agent—worst case being irrelevant search results or information retrieval that does not affect system integrity.

From the tool's definition Tool name 'search_web' and description 'Search the web for real-time information, news, images, books, or videos' indicate a pure retrieval operation with no side effects or ability to modify, delete, or execute code.

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

POLICY

How to control search_web

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

policy.json

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

search_web 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 Cross Validated 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

More Cross Validated Search tools

Destructive clear_cache Clear the response cache. Use this when you need fresh results instead of cached data. Read llm_context Build compact, citation-ready Markdown context for LLMs. Prefer this when an agent Read browse_page Fetch and extract content from a URL. Returns Markdown by default (use format= Read evidence_report Generate a higher-level evidence report that combines search, verification, Read list_providers List available search providers, provider profiles, goggles presets, and setup hints. Read verify_claim Evaluate whether a factual claim looks supported, contested, or Read setup_providers Check provider status and get setup instructions. Shows which providers are configured,

All 8 Cross Validated 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 search_web

What does the search_web tool do? +

Search the web for real-time information, news, images, books, or videos. It is categorised as a Read tool in the Cross Validated Search MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on search_web? +

Register the Cross Validated Search MCP server in PolicyLayer and add a rule for search_web: 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 Cross Validated Search. Nothing to install.

What risk level is search_web? +

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

Can I rate-limit search_web? +

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

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

search_web is provided by the Cross Validated Search MCP server (wd041216-bit/zero-api-key-web-search). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Cross Validated Search tool call.

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

CHECK YOUR STACK →