blast_radius_field_references
Blast radius: find where a table field is referenced — its dictionary entry plus any scripts (business rules, script includes, client scripts, UI actions, widgets) that mention the field name. Run before renaming or removing a field. Script matches are substring (LIKE) hits, so expect false posit...
This record as markdown: /tools/servicenow-mcp-server/blast-radius-field-references.md
What blast_radius_field_references does on ServiceNow MCP Server
AI agents call blast_radius_field_references to retrieve information from ServiceNow MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why blast_radius_field_references is rated Low
This tool purely queries and retrieves information about where a field is referenced across scripts and dictionary entries. It performs no modifications, executions, or deletions. Severity is medium because the results are used to guide potentially destructive operations (renaming/removing fields), meaning misuse or misinterpretation of its output could indirectly lead to harmful changes.
From the tool's definition find where a table field is referenced — its dictionary entry plus any scripts...Run before renaming or removing a field...treat results as candidates to review, not a definitive list
Attacks that exploit this kind of access
The rule that runs blast_radius_field_references safely
PolicyLayer is an MCP gateway: it sits between your AI agents and ServiceNow MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For blast_radius_field_references, this is the rule to start with:
blast_radius_field_references is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect ServiceNow MCP Server, apply this rule, and every blast_radius_field_references call is checked against it from then on.
Questions about blast_radius_field_references
Blast radius: find where a table field is referenced — its dictionary entry plus any scripts (business rules, script includes, client scripts, UI actions, widgets) that mention the field name. Run before renaming or removing a field. Script matches are substring (LIKE) hits, so expect false positives (comments, similarly-named symbols) and misses for dynamically-built references; treat results as candidates to review, not a definitive list. 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 blast_radius_field_references: 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.
blast_radius_field_references 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 blast_radius_field_references 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 blast_radius_field_references. 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.
blast_radius_field_references is provided by the ServiceNow MCP Server MCP server (@aartiq/servicenow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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