diff --git a/logic/classification.js b/logic/classification.js
new file mode 100644
index 0000000..4b565b8
--- /dev/null
+++ b/logic/classification.js
@@ -0,0 +1,44 @@
+const VALID_CLASSIFICATIONS = [
+  'ACTIONABLE_NOW', 'UNASSIGNED_ACTIONABLE', 'WAITING_REQUESTER', 'WAITING_VENDOR',
+  'WAITING_APPROVAL', 'SCHEDULED', 'DEPENDENCY_BLOCKED', 'NEEDS_COORDINATION',
+  'PROJECT_LONG_TERM', 'DUPLICATE_OR_OBSOLETE', 'INSUFFICIENT_CONTEXT',
+];
+
+function validateAiClassification(raw) {
+  const errors = [];
+  if (!raw || typeof raw !== 'object') {
+    return { valid: false, data: null, errors: ['resposta nao e um objeto JSON'] };
+  }
+  if (!VALID_CLASSIFICATIONS.includes(raw.classification)) {
+    errors.push(`classification invalida: ${raw.classification}`);
+  }
+  if (typeof raw.actionable_today !== 'boolean') errors.push('actionable_today deve ser boolean');
+  const confidence = Number(raw.confidence);
+  if (!Number.isFinite(confidence) || confidence < 0 || confidence > 1) errors.push('confidence deve estar entre 0 e 1');
+  if (typeof raw.next_action !== 'string' || raw.next_action.length > 200) errors.push('next_action invalido');
+  if (raw.evidence != null && !Array.isArray(raw.evidence)) errors.push('evidence deve ser array');
+  if (typeof raw.reason !== 'string') errors.push('reason deve ser string');
+
+  if (errors.length) return { valid: false, data: null, errors };
+
+  return {
+    valid: true,
+    errors: [],
+    data: {
+      classification: raw.classification,
+      actionable_today: raw.actionable_today,
+      confidence,
+      blocker_type: raw.blocker_type ?? null,
+      waiting_for: raw.waiting_for ?? null,
+      next_action: raw.next_action,
+      suggested_action_type: raw.suggested_action_type ?? 'technical_action',
+      business_risk: raw.business_risk ?? 'medium',
+      reason: raw.reason,
+      evidence: Array.isArray(raw.evidence) ? raw.evidence.slice(0, 5) : [],
+      is_fallback: false,
+      fallback_reason: null,
+    },
+  };
+}
+
+module.exports = { VALID_CLASSIFICATIONS, validateAiClassification };
diff --git a/logic/classification.test.js b/logic/classification.test.js
new file mode 100644
index 0000000..004e57b
--- /dev/null
+++ b/logic/classification.test.js
@@ -0,0 +1,54 @@
+const { test } = require('node:test');
+const assert = require('node:assert/strict');
+const { validateAiClassification, VALID_CLASSIFICATIONS } = require('./classification');
+
+function validRaw(overrides) {
+  return Object.assign({
+    classification: 'ACTIONABLE_NOW',
+    actionable_today: true,
+    confidence: 0.91,
+    blocker_type: null,
+    waiting_for: null,
+    next_action: 'Validar equipamento e registrar resultado.',
+    suggested_action_type: 'technical_action',
+    business_risk: 'medium',
+    reason: 'Existe acao tecnica pendente.',
+    evidence: ['ultimo apontamento indica necessidade de validacao'],
+  }, overrides);
+}
+
+test('objeto valido passa e normaliza campos', () => {
+  const result = validateAiClassification(validRaw({}));
+  assert.equal(result.valid, true);
+  assert.equal(result.data.classification, 'ACTIONABLE_NOW');
+  assert.equal(result.data.is_fallback, false);
+});
+
+test('classification invalida falha com erro claro', () => {
+  const result = validateAiClassification(validRaw({ classification: 'ALGO_INVENTADO' }));
+  assert.equal(result.valid, false);
+  assert.ok(result.errors.some((e) => e.includes('classification')));
+});
+
+test('JSON invalido/null nao lanca excecao', () => {
+  assert.doesNotThrow(() => validateAiClassification(null));
+  assert.doesNotThrow(() => validateAiClassification('nao e objeto'));
+  assert.equal(validateAiClassification(null).valid, false);
+});
+
+test('confidence fora de 0..1 falha', () => {
+  const result = validateAiClassification(validRaw({ confidence: 1.5 }));
+  assert.equal(result.valid, false);
+});
+
+test('evidence e limitado a 5 itens', () => {
+  const result = validateAiClassification(validRaw({ evidence: ['a', 'b', 'c', 'd', 'e', 'f', 'g'] }));
+  assert.equal(result.data.evidence.length, 5);
+});
+
+test('todas as classes do dominio sao aceitas', () => {
+  for (const classification of VALID_CLASSIFICATIONS) {
+    const result = validateAiClassification(validRaw({ classification }));
+    assert.equal(result.valid, true, `classe ${classification} deveria ser valida`);
+  }
+});