AI agents call data_csv_analyze to retrieve information from Onion without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and analyzes existing CSV data to produce summary statistics and metadata (column info, row count, numerical stats). It performs no modifications, deletions, or side effects—only data inspection and aggregation.
From the tool's definition Tool description states '分析 CSV 数据，输出列信息、行数、数值列统计等摘要' which translates to 'Analyze CSV data, output column information, row count, numerical column statistics, etc. summary.' The verbs are purely analytical: analyze, output, summarize.
Attacks that exploit this kind of access
分析 CSV 数据，输出列信息、行数、数值列统计等摘要。. It is categorised as a Read tool in the Onion MCP Server, which means it retrieves data without modifying state.
Register the Onion MCP server in PolicyLayer and add a rule for data_csv_analyze: 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 Onion. Nothing to install.
data_csv_analyze 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 data_csv_analyze 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 data_csv_analyze. 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.
data_csv_analyze is provided by the Onion MCP server (onion-ai/mcp-server). 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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