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Update Fact Definition

lexq_facts_update
Destructive

Update a fact definition. The key is immutable. The type can change only while no rule references the fact; if any does, the call fails with FD-007 and reports the count. Rules in deleted groups do not count. Only the fields you send are changed. System facts (isBlocked, blockReason) accept changes to name, description, PII, and the value domain; isRequired is ignored, and their type cannot change (FD-003).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameNoDisplay name
typeNoValue type. Omit to leave it unchanged. Changing it fails with FD-007 while any rule outside a deleted group references the fact.
isPiiNoPII flag — enables/disables masking (changeable even on system facts)
factIdYesFact definition ID
isRequiredNoRequired flag
descriptionNoDescription
valueDomainNoWhich values this fact accepts. Three states: omit the field to leave the constraint alone, send {} to remove it, or send a populated object to replace it. Narrowing it does not rewrite rules that already reference this fact — they keep working, and the next save is judged against the new constraint.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / type / description
      Previous value: -"Value type. Omit to leave it unchanged. Changing it fails with FD-007 while any rule references the fact."New value: +"Value type. Omit to leave it unchanged. Changing it fails with FD-007 while any rule outside a deleted group references the fact."
  2. Changed1 schema field changed
    • addedInput schema / properties / valueDomain
      Added value: +{
+  "description": "Which values this fact accepts. Three states: omit the field to leave the constraint alone, send {} to remove it, or send a populated object to replace it. Narrowing it does not rewrite rules that already reference this fact — they keep working, and the next save is judged against the new constraint.",
+  "properties": {
+    "allowedValues": {
+      "description": "Accepted values. For list types the constraint applies to each element, not to the list as a whole.",
+      "items": {
+        "type": [
+          "string",
+          "number"
+        ]
+      },
+      "type": "array"
+    },
+    "max": {
+      "description": "Upper bound, inclusive. Numeric types only.",
+      "type": "number"
+    },
+    "min": {
+      "description": "Lower bound, inclusive. Numeric types only.",
+      "type": "number"
+    }
+  },
+  "type": "object"
+}
  3. Changed4 schema fields changed
    • changedInput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
    • removedInput schema / additionalProperties
      Removed value: -false
    • addedInput schema / properties / factId / pattern
      Added value: +"^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$"
    • addedInput schema / properties / type
      Added value: +{
+  "description": "Value type. Omit to leave it unchanged. Changing it fails with FD-007 while any rule references the fact.",
+  "enum": [
+    "STRING",
+    "NUMBER",
+    "BOOLEAN",
+    "LIST_STRING",
+    "LIST_NUMBER"
+  ],
+  "type": "string"
+}
  4. Changed1 schema field changed
    • addedInput schema / properties / isPii
      Added value: +{
+  "description": "PII flag — enables/disables masking (changeable even on system facts)",
+  "type": "boolean"
+}
  5. Changed1 schema field changed
    • changedInput schema / required
      Previous value: -[
-  "factId",
-  "name",
-  "isRequired"
-]New value: +[
+  "factId"
+]
  6. First observed

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