Web scraping and URL content extraction via Bittensor subnet 21. Cost: $0.01 per call.
AI agents call bittensor_scrape to retrieve information from Swarmrails MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Web scraping and URL content extraction are read-only operations that retrieve and query publicly or permitted content from web pages. No side effects occur on the scraped systems beyond normal HTTP requests.
From the tool's definition Tool description states 'Web scraping and URL content extraction' — retrieval operations with no data modification, deletion, or execution of arbitrary code on target systems.
Attacks that exploit this kind of access
Web scraping and URL content extraction via Bittensor subnet 21. Cost: $0.01 per call. It is categorised as a Read tool in the Swarmrails MCP MCP Server, which means it retrieves data without modifying state.
Register the Swarmrails MCP server in PolicyLayer and add a rule for bittensor_scrape: 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 Swarmrails MCP. Nothing to install.
bittensor_scrape 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 bittensor_scrape 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 bittensor_scrape. 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.
bittensor_scrape is provided by the Swarmrails MCP server (wizerai1111/swarmrails-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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