web_search

THE RISK

Low Risk

Why web_search needs a policy

Web search is a read-only operation that queries external data sources and returns results without modifying, deleting, or executing code. The tool has no destructive, financial, or code execution capabilities. Severity is low as misuse would only result in unwanted information retrieval with minimal blast radius.

From the tool's definition Tool description states 'Search the web using DuckDuckGo and return relevant results' - a query operation that retrieves data without side effects.

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

POLICY

How to control web_search

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

policy.json

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

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 A-Modular-Kingdom — 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 A-Modular-Kingdom tools

Destructive delete_memory Delete a specific memory by ID. Execute code_execute Execute Python code in a sandboxed subprocess and return stdout/stderr Execute browse_web Control a persistent browser. Actions: navigate (open URL), click (by CSS selector or x,y Execute text_to_speech Convert text to speech using various TTS engines. Can play audio directly or save to file. Write save_fact save_fact Write save_memory save_memory Write set_global_rule Set a permanent global rule that persists across all projects and sessions Read analyze_media Analyze image/video files with a local multimodal model via Ollama (e.g., gemma3:4b)

All 14 A-Modular-Kingdom 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 web_search

What does the web_search tool do? +

Search the web using DuckDuckGo and return relevant results. It is categorised as a Read tool in the A-Modular-Kingdom MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on web_search? +

Register the A-Modular-Kingdom MCP server in PolicyLayer and add a rule for 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 A-Modular-Kingdom. Nothing to install.

What risk level is web_search? +

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

Can I rate-limit web_search? +

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

Set action: deny in the PolicyLayer policy for 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 web_search? +

web_search is provided by the A-Modular-Kingdom MCP server (masihmoafi/a-modular-kingdom). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every A-Modular-Kingdom tool call.

Start from A-Modular-Kingdom, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →