Get the schema for the graph including the vertex and edge labels as well as the
AI agents call get_graph_schema to retrieve information from AWS IoT SiteWise 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 information (vertex and edge labels) from a graph structure. It performs a read-only query operation with no side effects, no data modification, and no external operations triggered. The blast radius of misuse is minimal—an attacker gains only informational access to schema structure, which is typically not sensitive enough to warrant higher severity in most contexts.
From the tool's definition Tool name 'get_graph_schema' and description 'Get the schema for the graph including the vertex and edge labels' indicate a retrieval operation that queries schema metadata without modification.
Attacks that exploit this kind of access
Get the schema for the graph including the vertex and edge labels as well as the. It is categorised as a Read tool in the AWS IoT SiteWise MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AWS IoT SiteWise MCP Server MCP server in PolicyLayer and add a rule for get_graph_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 AWS IoT SiteWise MCP Server. Nothing to install.
get_graph_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_graph_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_graph_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_graph_schema is provided by the AWS IoT SiteWise MCP Server MCP server (awslabs.aws-iot-sitewise-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.