stock_boll
AI agents call stock_boll to retrieve information from FNewsCrawler without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Based on sibling tools being exclusively data retrieval (news, stock info, fund flows, trading details, disclosure reports), stock_boll most likely retrieves technical analysis data (Bollinger Bands) rather than executing commands or modifying data. Confidence is modest due to empty description, but the pattern of the server strongly indicates Read category.
From the tool's definition Tool name 'stock_boll' (Bollinger Bands stock indicator) and server context (FNewsCrawler provides financial news/data); description is empty but sibling tools are all data retrieval operations (get_ak_*, get_eastmoney_*) suggesting Read operations.
Attacks that exploit this kind of access
stock_boll. It is categorised as a Read tool in the FNewsCrawler MCP Server, which means it retrieves data without modifying state.
Register the FNewsCrawler MCP server in PolicyLayer and add a rule for stock_boll: 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 FNewsCrawler. Nothing to install.
stock_boll 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 stock_boll 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 stock_boll. 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.
stock_boll is provided by the FNewsCrawler MCP server (noimank/fnewscrawler). 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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