Inspect the field definitions (schema) of any ServiceNow table. Returns field names, types, labels, mandatory flags, max lengths, and reference targets from sys_dictionary. Args: - table (string): Table to introspect (e.g., incident, change_request, cmdb_ci_server) - include_inherited (boolean): ...
AI agents call servicenow_get_table_schema to retrieve information from Servicenow without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries the sys_dictionary to introspect table schemas, which is a read-only operation that retrieves structural metadata about ServiceNow tables. There is no capability to modify data, execute code, delete records, or trigger external operations. The tool parameters (table name, inherited flag, filter) are all for filtering the retrieval, not for performing any action. This is a classic Read category tool.
From the tool's definition Tool description states 'Inspect the field definitions (schema)' and 'Returns field names, types, labels, mandatory flags, max lengths, and reference targets' — purely retrieving metadata with no modification or side effects.
Attacks that exploit this kind of access
Inspect the field definitions (schema) of any ServiceNow table. Returns field names, types, labels, mandatory flags, max lengths, and reference targets from sys_dictionary. Args: - table (string): Table to introspect (e.g., incident, change_request, cmdb_ci_server) - include_inherited (boolean): Include fields inherited from parent tables (default: false — own fields only) - filter_type (string): Filter by field type (e.g.,. It is categorised as a Read tool in the Servicenow MCP Server, which means it retrieves data without modifying state.
Register the Servicenow MCP server in PolicyLayer and add a rule for servicenow_get_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. Nothing to install.
servicenow_get_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 servicenow_get_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 servicenow_get_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.
servicenow_get_table_schema is provided by the Servicenow MCP server (kylburns89/servicenow-mcp-server). 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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