Get the schema information of the specified space
AI agents call get_space_schema to retrieve information from NebulaGraph 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 from a NebulaGraph database space. Schema information is descriptive data about the graph structure (vertices, edges, properties) and does not involve data modification, deletion, or code execution. It poses minimal risk as it only exposes structural information about the database.
From the tool's definition Tool name 'get_space_schema' and description 'Get the schema information of the specified space' indicate a retrieval operation.
Documented attack patterns abuse exactly the kind of access get_space_schema gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and NebulaGraph MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_space_schema:
{
"version": "1",
"default": "deny",
"tools": {
"get_space_schema": {}
}
}get_space_schema is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the schema information of the specified space. It is categorised as a Read tool in the NebulaGraph MCP Server MCP Server, which means it retrieves data without modifying state.
Register the NebulaGraph MCP Server MCP server in PolicyLayer and add a rule for get_space_schema: 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 NebulaGraph MCP Server. Nothing to install.
get_space_schema 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_space_schema 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_space_schema. 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_space_schema is provided by the NebulaGraph MCP Server MCP server (nebula-contrib/nebulagraph-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from NebulaGraph MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 NebulaGraph MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.