AI agents call get_block_attrs 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 tool retrieves block attributes from SiYuan Note, which is a read-only query operation. It does not create, modify, delete, or execute anything—it only fetches existing data. The low severity reflects minimal blast radius if misused by an AI agent, as reading attributes cannot directly harm data or systems.
From the tool's definition Tool name 'get_block_attrs' and description '获取块属性' (get block attributes) indicate retrieval of metadata about a block without modification. The verb 'get' is characteristic of read operations.
Documented attack patterns abuse exactly the kind of access get_block_attrs 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 get_block_attrs:
{
"version": "1",
"default": "deny",
"tools": {
"get_block_attrs": {}
}
}get_block_attrs is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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获取块属性. 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 get_block_attrs: 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.
get_block_attrs 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 get_block_attrs 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 get_block_attrs. 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.
get_block_attrs 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.