AI agents call extract_entities to retrieve information from Crawl-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Extract operations on this server are consistently read-only; they parse and retrieve information from web content, documents, and videos without modifying or executing code. Empty description lowers confidence slightly, but contextual pattern from sibling tools and server design strongly indicates entity extraction is a read operation (querying structured data from content).
From the tool's definition Tool name 'extract_entities' combined with server purpose of content extraction and analysis suggests data retrieval. Sibling tools like 'extract_youtube_transcript' and 'extract_youtube_comments' establish a pattern of non-destructive extraction operations.
Documented attack patterns abuse exactly the kind of access extract_entities gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Crawl-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for extract_entities:
{
"version": "1",
"default": "deny",
"tools": {
"extract_entities": {}
}
}extract_entities is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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extract_entities. It is categorised as a Read tool in the Crawl-MCP MCP Server, which means it retrieves data without modifying state.
Register the Crawl- MCP server in PolicyLayer and add a rule for extract_entities: 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 Crawl-MCP. Nothing to install.
extract_entities is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the extract_entities 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.
Set action: deny in the PolicyLayer policy for extract_entities. 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.
extract_entities is provided by the Crawl- MCP server (walksoda/crawl-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 Crawl-MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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19 Crawl-MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.