Get the column schema and sample values for a datastore resource.
AI agents call get_resource_schema to retrieve information from Ontario Data without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves structural information (column schema and sample values) from a data resource, which is a read-only operation with no side effects. It does not modify data, execute code, delete resources, or involve financial transactions. The low severity reflects the minimal blast radius—exposing schema metadata poses negligible risk even if misused by an agent.
From the tool's definition Tool name 'get_resource_schema' and description 'Get the column schema and sample values for a datastore resource' indicate retrieval of metadata and sample data without modification or execution of arbitrary operations.
Attacks that exploit this kind of access
Get the column schema and sample values for a datastore resource. It is categorised as a Read tool in the Ontario Data MCP Server, which means it retrieves data without modifying state.
Register the Ontario Data MCP server in PolicyLayer and add a rule for get_resource_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 Ontario Data. Nothing to install.
get_resource_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_resource_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_resource_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_resource_schema is provided by the Ontario Data MCP server (sprine/ontario-data-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →