AI agents call check_siyuan_status to retrieve information from SiYuan MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a diagnostic/monitoring tool that queries the state of the SiYuan application and verifies API connectivity. It performs no mutations, deletions, code execution, or financial operations. It is a simple read-only status check, which is the lowest-risk category.
From the tool's definition Tool name 'check_siyuan_status' and description '检查思源笔记状态和 API 可用性' (Check SiYuan note status and API availability) indicate status/health checking with no data retrieval, modification, or side effects.
Documented attack patterns abuse exactly the kind of access check_siyuan_status gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SiYuan MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for check_siyuan_status:
{
"version": "1",
"default": "deny",
"tools": {
"check_siyuan_status": {}
}
}check_siyuan_status is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
检查思源笔记状态和 API 可用性. It is categorised as a Read tool in the SiYuan MCP Server MCP Server, which means it retrieves data without modifying state.
Register the SiYuan MCP Server MCP server in PolicyLayer and add a rule for check_siyuan_status: 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 SiYuan MCP Server. Nothing to install.
check_siyuan_status 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 check_siyuan_status 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 check_siyuan_status. 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.
check_siyuan_status is provided by the SiYuan MCP Server MCP server (xgq18237/siyuan_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 52 SiYuan MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
52 SiYuan MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.