Get table schema/dictionary information
AI agents call table_schema to retrieve information from ServiceNow 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 and dictionary metadata from ServiceNow tables, which is a read-only operation with no side effects. It enables understanding of table structure but does not create, modify, delete, or execute any business logic or commands. The blast radius if misused is minimal, as schema information is typically non-sensitive operational metadata.
From the tool's definition Tool name 'table_schema' and description 'Get table schema/dictionary information' indicate retrieval of metadata about ServiceNow table structures. No modification, deletion, or execution of operations occurs—only querying structural/schema data.
Attacks that exploit this kind of access
Get table schema/dictionary information. It is categorised as a Read tool in the ServiceNow MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ServiceNow MCP Server MCP server in PolicyLayer and add a rule for table_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 ServiceNow MCP Server. Nothing to install.
table_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 table_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 table_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.
table_schema is provided by the ServiceNow MCP Server MCP server (schwarztim/servicenow-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.
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