AI agents call get_child_blocks 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 or queries child blocks from a parent block in SiYuan Note, returning existing data with no side effects. It follows the Read category pattern of data retrieval operations like 'get' or 'fetch'. The severity is low as it only exposes information without ability to modify, delete, or execute operations.
From the tool's definition Tool name 'get_child_blocks' and description '获取子块' (get child blocks) indicate a retrieval operation that queries hierarchical block data without modification.
Documented attack patterns abuse exactly the kind of access get_child_blocks 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_child_blocks:
{
"version": "1",
"default": "deny",
"tools": {
"get_child_blocks": {}
}
}get_child_blocks is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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获取子块. 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_child_blocks: 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_child_blocks 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_child_blocks 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_child_blocks. 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_child_blocks 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.
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52 SiYuan MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.