AI agents call get_available_sources to retrieve information from Crawl4AI+SearXNG MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The naming pattern 'get_*' combined with 'sources' indicates a query operation to list or retrieve information about available sources (likely SearXNG providers, Crawl4AI configurations, or data repositories). This has no side effects or ability to modify state. Low severity due to read-only nature and expected limited data sensitivity of source metadata.
From the tool's definition Tool name 'get_available_sources' strongly suggests retrieval of metadata about available data sources with no modification capability. Description is empty, limiting evidence precision.
Documented attack patterns abuse exactly the kind of access get_available_sources gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Crawl4AI+SearXNG MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_available_sources:
{
"version": "1",
"default": "deny",
"tools": {
"get_available_sources": {}
}
}get_available_sources is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_available_sources. It is categorised as a Read tool in the Crawl4AI+SearXNG MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Crawl4AI+SearXNG MCP Server MCP server in PolicyLayer and add a rule for get_available_sources: 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 Crawl4AI+SearXNG MCP Server. Nothing to install.
get_available_sources 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 get_available_sources 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 get_available_sources. 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.
get_available_sources is provided by the Crawl4AI+SearXNG MCP Server MCP server (tokidoo/crawl4ai-rag-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 10 Crawl4AI+SearXNG MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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10 Crawl4AI+SearXNG MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.