diff --git a/packages/workflow-executor/src/executors/record-step-executor.ts b/packages/workflow-executor/src/executors/record-step-executor.ts
index 92e96f712..4430dfacc 100644
--- a/packages/workflow-executor/src/executors/record-step-executor.ts
+++ b/packages/workflow-executor/src/executors/record-step-executor.ts
@@ -77,20 +77,25 @@ export default abstract class RecordStepExecutor<
   }
 
   protected findField(schema: CollectionSchema, name: string): FieldSchema | undefined {
-    // The tool definition sent to the LLM is built from z.literal(displayName) — the JSON
-    // Schema does constrain fieldName to exact values. However, invokeWithTool returns
-    // toolCall.args as-is without re-running Zod validation on the response, so the LLM can
-    // silently ignore the constraint and return a formatting variation (e.g. "first_name"
-    // instead of "firstname"). The normalized fallback catches these cosmetic mismatches.
+    // LLMs occasionally return formatting variants of field names (e.g. "first_name" for
+    // "firstname", "full-name" for "Full Name") even though the tool schema declares them
+    // as literals. Fall back to a normalized comparison so a cosmetic variation doesn't
+    // fail an otherwise correct step.
     const normalizeFieldName = (s: string) => s.toLowerCase().replace(/[\s_-]/g, '');
     const normalized = normalizeFieldName(name);
 
-    return (
+    const exact =
       schema.fields.find(f => f.displayName === name) ??
-      schema.fields.find(f => f.fieldName === name) ??
-      schema.fields.find(f => normalizeFieldName(f.displayName) === normalized) ??
-      schema.fields.find(f => normalizeFieldName(f.fieldName) === normalized)
+      schema.fields.find(f => f.fieldName === name);
+    if (exact) return exact;
+
+    const fuzzy = schema.fields.filter(
+      f =>
+        normalizeFieldName(f.displayName) === normalized ||
+        normalizeFieldName(f.fieldName) === normalized,
     );
+
+    return fuzzy.length === 1 ? fuzzy[0] : undefined;
   }
 
   private async toRecordIdentifier(record: RecordRef): Promise<string> {
diff --git a/packages/workflow-executor/test/executors/update-record-step-executor.test.ts b/packages/workflow-executor/test/executors/update-record-step-executor.test.ts
index 9c1866e09..c017607f8 100644
--- a/packages/workflow-executor/test/executors/update-record-step-executor.test.ts
+++ b/packages/workflow-executor/test/executors/update-record-step-executor.test.ts
@@ -499,6 +499,72 @@ describe('UpdateRecordStepExecutor', () => {
     });
   });
 
+  describe('resolveFieldName fuzzy matching', () => {
+    it.each([
+      ['snake_case variant', 'full_name', 'Full Name', 'name'],
+      ['camelCase variant', 'fullName', 'Full Name', 'name'],
+      ['lowercase no separator', 'fullname', 'Full Name', 'name'],
+      ['hyphen variant', 'full-name', 'Full Name', 'name'],
+    ])(
+      'resolves field when LLM returns %s (%s)',
+      async (_label, aiReturnedName, _displayName, expectedFieldName) => {
+        const agentPort = makeMockAgentPort();
+        const mockModel = makeMockModel({
+          input: { fieldName: aiReturnedName, value: 'John Doe', reasoning: 'test' },
+        });
+        const context = makeContext({
+          model: mockModel.model,
+          agentPort,
+          stepDefinition: makeStep({ automaticExecution: true }),
+        });
+        const executor = new UpdateRecordStepExecutor(context);
+
+        const result = await executor.execute();
+
+        expect(result.stepOutcome.status).toBe('success');
+        expect(agentPort.updateRecord).toHaveBeenCalledWith(
+          expect.objectContaining({ values: { [expectedFieldName]: 'John Doe' } }),
+          expect.anything(),
+        );
+      },
+    );
+
+    it('returns undefined (field not found) when two fields normalize to the same string', async () => {
+      // { displayName: "Full Name", fieldName: "fullname" } and
+      // { displayName: "FullName", fieldName: "full_name" } both normalize to "fullname".
+      // Returning either one would be a silent wrong pick — undefined is safer.
+      const ambiguousSchema = makeCollectionSchema({
+        fields: [
+          {
+            fieldName: 'fullname',
+            displayName: 'Full Name',
+            isRelationship: false,
+            type: 'String',
+          },
+          {
+            fieldName: 'full_name',
+            displayName: 'FullName',
+            isRelationship: false,
+            type: 'String',
+          },
+        ],
+      });
+      const mockModel = makeMockModel({
+        input: { fieldName: 'Full-Name', value: 'John', reasoning: 'test' },
+      });
+      const context = makeContext({
+        model: mockModel.model,
+        workflowPort: makeMockWorkflowPort({ customers: ambiguousSchema }),
+        stepDefinition: makeStep({ automaticExecution: true }),
+      });
+      const executor = new UpdateRecordStepExecutor(context);
+
+      const result = await executor.execute();
+
+      expect(result.stepOutcome.status).toBe('error');
+    });
+  });
+
   describe('relationship fields excluded from update tool', () => {
     it('excludes relationship fields from the tool schema', async () => {
       const mockModel = makeMockModel({