Download and return the markdown content from a completed crawl job. Returns all pages concatenated with separators. Truncates at 100KB to avoid overwhelming context.
AI agents call crawl_download to retrieve information from UnWeb MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data (markdown content) from a finished crawl operation without side effects. It is a read-only operation that queries and returns information. The truncation at 100KB is a safety measure to prevent context overflow, not an indication of destructive or write behavior. No data is created, modified, deleted, or executed—only fetched and returned.
From the tool's definition Tool description states 'Download and return the markdown content from a completed crawl job' with no mention of modifying, deleting, or executing operations.
Attacks that exploit this kind of access
Download and return the markdown content from a completed crawl job. Returns all pages concatenated with separators. Truncates at 100KB to avoid overwhelming context. It is categorised as a Read tool in the UnWeb MCP Server MCP Server, which means it retrieves data without modifying state.
Register the UnWeb MCP Server MCP server in PolicyLayer and add a rule for crawl_download: 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 UnWeb MCP Server. Nothing to install.
crawl_download 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 crawl_download 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 crawl_download. 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.
crawl_download is provided by the UnWeb MCP Server MCP server (mbsoft-systems/unweb-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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