AI agents call csmar_list_fields to retrieve information from CSMAR 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 schema/metadata information about fields in a database table with no side effects—it does not modify, execute code, delete data, or commit financial transactions. It is a Read operation with low severity since field enumeration poses minimal risk even if misused by an agent; the worst outcome would be information disclosure of table structure.
From the tool's definition Tool name 'csmar_list_fields' and description '列出指定表中的所有字段' (meaning 'List all fields in a specified table') indicate a retrieval operation that queries metadata about table structure.
Documented attack patterns abuse exactly the kind of access csmar_list_fields gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CSMAR MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for csmar_list_fields:
{
"version": "1",
"default": "deny",
"tools": {
"csmar_list_fields": {}
}
}csmar_list_fields is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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列出指定表中的所有字段. It is categorised as a Read tool in the CSMAR MCP Server MCP Server, which means it retrieves data without modifying state.
Register the CSMAR MCP Server MCP server in PolicyLayer and add a rule for csmar_list_fields: 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 CSMAR MCP Server. Nothing to install.
csmar_list_fields 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 csmar_list_fields 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 csmar_list_fields. 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.
csmar_list_fields is provided by the CSMAR MCP Server MCP server (ww11-max/csmar-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CSMAR MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
11 CSMAR MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.