// MCP TOOL REFERENCE

batch_crawl

ServerMCP Server for Crawl4AI
CategoryExecute

WHAT IT DOES

What batch_crawl does on MCP Server for Crawl4AI

AI agents invoke batch_crawl to trigger actions in MCP Server for Crawl4AI. 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.

THE RISK

High Risk

Why batch_crawl needs a policy

This tool launches browser instances to fetch and process multiple external URLs concurrently. It triggers external network operations and browser automation whose scope and effects depend on the URLs provided.

From the tool's definition 'Crawl multiple URLs concurrently', 'Each URL gets a fresh browser', 'bulk data extraction', 'browser automation'

Risk signalsBulk/mass operation — affects multiple targets

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

POLICY

How to control batch_crawl

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Server for Crawl4AI, and nothing reaches the server without passing your rules. This is the rule we recommend for batch_crawl:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "batch_crawl": {
      "limits": [
        {
          "counter": "batch_crawl_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

batch_crawl 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.

Create a free account and register MCP Server for Crawl4AI — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP Server for Crawl4AI tools

Execute crawl_recursive [STATELESS] Deep crawl a website following internal links. Use when: mapping entire sites, Execute extract_with_llm [STATELESS] Ask questions about webpage content using AI. Returns natural language answers Write generate_pdf [STATELESS] Convert webpage to PDF. Returns base64-encoded PDF data. Creates new browser e Read parse_sitemap [STATELESS] Extract URLs from XML sitemaps. Use when: discovering all site pages, planning Read capture_screenshot [STATELESS] Capture webpage screenshot. Returns base64-encoded PNG data. Creates new brows Read extract_links [STATELESS] Extract and categorize all page links. Use when: building sitemaps, analyzing Read get_html [STATELESS] Get sanitized/processed HTML for inspection and automation planning. Use when: Read get_markdown [STATELESS] Extract content as markdown with filtering options. Supports: raw (full conten

All 10 MCP Server for Crawl4AI tools →

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Go deeper

High-risk tools in MCP Server for Crawl4AI → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about batch_crawl

What does the batch_crawl tool do? +

[STATELESS] Crawl multiple URLs concurrently for efficiency. Use when: processing URL lists, comparing multiple pages, or bulk data extraction. Faster than sequential crawling. Max 5 concurrent by default. Each URL gets a fresh browser. Cannot maintain state between URLs. For persistent operations use create_session + crawl. It is categorised as a Execute tool in the MCP Server for Crawl4AI MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on batch_crawl? +

Register the MCP Server for Crawl4AI MCP server in PolicyLayer and add a rule for batch_crawl: 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 Server for Crawl4AI. Nothing to install.

What risk level is batch_crawl? +

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

Can I rate-limit batch_crawl? +

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

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

batch_crawl is provided by the MCP Server for Crawl4AI MCP server (omgwtfwow/mcp-crawl4ai-ts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Server for Crawl4AI tool call.

Start from MCP Server for Crawl4AI, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →

Free to start. No card required.

10 MCP Server for Crawl4AI tools catalogued and risk-classified — across an index of 43,000+ MCP servers.