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create_acl

Create a new ACL rule to control access to a table or field in ServiceNow. Define name, operation, type, roles, and optional condition script.

Instructions

Create a new ACL rule to control access to a table or field (requires SCRIPTING_ENABLED=true)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYesACL name (typically "table.field" or "table.*")
typeNo"record" | "field" | "rest_endpoint" | "soap_endpoint"
operationYes"read" | "write" | "create" | "delete" | "execute"
admin_overridesNoAllow admin to override (default: true)
activeNoWhether to activate immediately (default: true)
scriptNoOptional condition script (return true to allow)
rolesNoComma-separated roles required (e.g. "admin,itil")
descriptionNoDescription of this access rule
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations indicate this is a write operation (readOnlyHint=false) and not destructive (destructiveHint=false). The description adds the behavioral constraint requiring SCRIPTING_ENABLED=true, which is not in annotations. This is valuable context beyond the structured fields.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence that succinctly conveys the purpose, resource, and a critical prerequisite. No unnecessary words or details.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a create operation with no output schema, the description provides the essential purpose and a key prerequisite. It does not explain behavior for optional/required parameters in detail, but the schema already handles that. Overall, it is sufficiently complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already explains each parameter. The description does not add further meaning to parameters beyond stating the tool's purpose. Baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'Create', the resource 'ACL rule', and the purpose 'control access to a table or field'. It also includes a prerequisite. This distinguishes it from sibling tools like list_acls and update_acl.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description specifies a prerequisite (SCRIPTING_ENABLED=true), which is helpful for usage. However, it does not explicitly contrast when to use this tool versus alternatives like update_acl or list_acls, leaving some ambiguity.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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