diff --git a/AGENTS.md b/AGENTS.md
index ea11a99..6da2716 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -18,6 +18,19 @@
 
 - Conteudo T3 deve respeitar manifesto curricular, cobertura e revisoes
   pedagogica e linguistica, alem da aprovacao humana aplicavel.
+- Antes de criar ou ampliar conteudo T3, executar o preflight apenas para os
+  temas autorizados:
+
+  ```sh
+  npm run preflight:t3 -- --subject <materia> --topic <tema>
+  ```
+
+  Repetir `--topic <tema>` para cada tema. Codigo 2 significa que pelo menos
+  um tema solicitado ja esta publicado e completo: interromper antes de
+  escrever e revisar o escopo; codigo 1 indica entrada ou estado invalido;
+  codigo 0 indica que o trabalho solicitado nao esta completo, sem substituir
+  revisao editorial ou aprovacao humana.
+
 - Automacao, parecer de agente ou passagem nos checks nao autorizam merge,
   release ou deploy por si so.
 - Mudancas para `main` exigem PR, checks obrigatorios e autorizacao explicita
diff --git a/package.json b/package.json
index 201902f..374badc 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,7 @@
     "validate:mcp-governance": "node scripts/governance-mcp-server.cjs --validate",
     "test:mcp-governance": "node tests/agents/governance-mcp-server.spec.cjs",
     "validate:content": "node scripts/validate-content.cjs",
+    "preflight:t3": "node scripts/t3-publication-preflight.cjs",
     "create:t3-pilot-draft": "node scripts/create-t3-pilot-draft.cjs",
     "create:t3-geografia-agua-recurso": "node scripts/create-t3-geografia-agua-recurso.cjs",
     "create:t3-geografia-nascente-rio": "node scripts/create-t3-geografia-nascente-rio.cjs",
@@ -57,7 +58,7 @@
     "build:t3-portugues-expansion": "node scripts/build-t3-portugues-expansion.cjs",
     "test:branch-policy": "node tests/governance/branch-policy.spec.cjs && node tests/governance/branch-sync.spec.cjs && node tests/governance/merge-message-policy.spec.cjs",
     "test:guidelines": "node tests/governance/governance-guidelines.spec.cjs",
-    "test:content": "node tests/content/content-validator.spec.cjs && node tests/content/content-coverage-validator.spec.cjs && node tests/content/t3-pilot.spec.cjs && node tests/content/t3-geografia-agua-recurso.spec.cjs && node tests/content/t3-geografia-nascente-rio.spec.cjs && node tests/content/t3-geografia-agua-limitada.spec.cjs && node tests/content/t3-geografia-agua-brasil.spec.cjs && node tests/content/t3-geografia-usos-agua.spec.cjs && node tests/content/t3-ciencias-corpos-luz-release.spec.cjs && node tests/content/t3-portugues-release.spec.cjs && node tests/content/t3-matematica-release.spec.cjs && node tests/content/t3-ciencias-materiais-luz.spec.cjs && node tests/content/t3-ciencias-propriedades-luz.spec.cjs && node tests/content/t3-ciencias-espelhos.spec.cjs && node tests/content/t3-ciencias-luz-cores.spec.cjs && node tests/content/t3-ciencias-som-audicao.spec.cjs && node tests/content/t3-ingles-present-continuous.spec.cjs && node tests/content/t3-ingles-places-city.spec.cjs && node tests/content/t3-ingles-celebrations.spec.cjs && node tests/content/t3-ingles-means-transport.spec.cjs && node tests/content/t3-historia-povo-brasileiro.spec.cjs && node tests/content/t3-historia-imigrantes-ibericos.spec.cjs && node tests/content/t3-historia-imigrantes-italianos.spec.cjs && node tests/content/t3-historia-imigrantes-alemaes.spec.cjs && node tests/content/t3-historia-imigrantes-japoneses.spec.cjs && node tests/content/t3-portugues-usos-c.spec.cjs && node tests/content/t3-portugues-verbos.spec.cjs && node tests/content/t3-matematica-editorial.spec.cjs",
+    "test:content": "node tests/content/content-validator.spec.cjs && node tests/content/content-coverage-validator.spec.cjs && node tests/content/t3-pilot.spec.cjs && node tests/content/t3-geografia-agua-recurso.spec.cjs && node tests/content/t3-geografia-nascente-rio.spec.cjs && node tests/content/t3-geografia-agua-limitada.spec.cjs && node tests/content/t3-geografia-agua-brasil.spec.cjs && node tests/content/t3-geografia-usos-agua.spec.cjs && node tests/content/t3-ciencias-corpos-luz-release.spec.cjs && node tests/content/t3-portugues-release.spec.cjs && node tests/content/t3-matematica-release.spec.cjs && node tests/content/t3-ciencias-materiais-luz.spec.cjs && node tests/content/t3-ciencias-propriedades-luz.spec.cjs && node tests/content/t3-ciencias-espelhos.spec.cjs && node tests/content/t3-ciencias-luz-cores.spec.cjs && node tests/content/t3-ciencias-som-audicao.spec.cjs && node tests/content/t3-ingles-present-continuous.spec.cjs && node tests/content/t3-ingles-places-city.spec.cjs && node tests/content/t3-ingles-celebrations.spec.cjs && node tests/content/t3-ingles-means-transport.spec.cjs && node tests/content/t3-historia-povo-brasileiro.spec.cjs && node tests/content/t3-historia-imigrantes-ibericos.spec.cjs && node tests/content/t3-historia-imigrantes-italianos.spec.cjs && node tests/content/t3-historia-imigrantes-alemaes.spec.cjs && node tests/content/t3-historia-imigrantes-japoneses.spec.cjs && node tests/content/t3-portugues-usos-c.spec.cjs && node tests/content/t3-portugues-verbos.spec.cjs && node tests/content/t3-matematica-editorial.spec.cjs && node tests/content/t3-publication-preflight.spec.cjs",
     "test:frontend-security": "node tests/security/frontend-rendering.spec.cjs && node tests/ui/safe-rendering.spec.cjs",
     "test:pedagogical-regression": "node scripts/validate-pedagogical-regressions.cjs --scan-t2 && node tests/content/pedagogical-regression.spec.cjs",
     "test:ui:content-session": "node tests/ui/content-session.spec.cjs",
diff --git a/scripts/t3-publication-preflight.cjs b/scripts/t3-publication-preflight.cjs
new file mode 100644
index 0000000..1d3522a
--- /dev/null
+++ b/scripts/t3-publication-preflight.cjs
@@ -0,0 +1,116 @@
+const path = require('node:path');
+const {
+  loadContentCatalog,
+  loadContentSources,
+  loadCoverageManifest,
+} = require('./validate-content.cjs');
+
+const ROOT = path.resolve(__dirname, '..');
+const CONTENT_SET_ID = '2026-t3-v1';
+
+function parseArguments(args) {
+  const result = { subject: null, topics: [] };
+  for (let index = 0; index < args.length; index += 1) {
+    const argument = args[index];
+    if (argument !== '--subject' && argument !== '--topic') {
+      throw new Error('argumento invalido: ' + argument);
+    }
+    const value = args[index + 1];
+    if (!value || value.startsWith('--')) {
+      throw new Error(argument + ' exige um valor');
+    }
+    if (argument === '--subject') {
+      if (result.subject) throw new Error('--subject duplicado');
+      result.subject = value;
+    } else {
+      result.topics.push(value);
+    }
+    index += 1;
+  }
+  if (!result.subject) throw new Error('--subject obrigatorio');
+  if (result.topics.length === 0)
+    throw new Error('informe ao menos um --topic');
+  if (new Set(result.topics).size !== result.topics.length) {
+    throw new Error('--topic duplicado');
+  }
+  return result;
+}
+
+function evaluateTopics({
+  sources,
+  coverageManifest,
+  contentCatalog,
+  subject,
+  topics,
+}) {
+  const coverage = coverageManifest?.contentSets?.[CONTENT_SET_ID]?.subjects;
+  const expectedTopics = coverage?.[subject];
+  if (!expectedTopics) {
+    throw new Error('materia nao declarada no manifesto T3: ' + subject);
+  }
+
+  const contentSet = contentCatalog.find(
+    (entry) => entry.contentSetId === CONTENT_SET_ID,
+  );
+  if (!contentSet) throw new Error('acervo T3 ausente no catalogo');
+
+  const questions = sources[subject]?.questions || [];
+  const results = topics.map((topic) => {
+    const expected = expectedTopics[topic];
+    if (!Number.isInteger(expected) || expected < 1) {
+      throw new Error('tema nao declarado no manifesto T3: ' + topic);
+    }
+    const matching = questions.filter(
+      (question) =>
+        question.contentSetId === CONTENT_SET_ID && question.topic === topic,
+    );
+    const actual = matching.length;
+    if (actual > expected) {
+      throw new Error(
+        'cobertura acima da meta para ' + topic + ': atual=' + actual,
+      );
+    }
+    const complete =
+      contentSet.status === 'published' &&
+      actual === expected &&
+      matching.every((question) => question.reviewStatus === 'published');
+    return {
+      topic,
+      actual,
+      expected,
+      contentStatus: contentSet.status,
+      complete,
+    };
+  });
+
+  return {
+    schemaVersion: 't3-publication-preflight-v1',
+    contentSetId: CONTENT_SET_ID,
+    subject,
+    topics: results,
+    decision: results.some((result) => result.complete)
+      ? 'stop_already_complete'
+      : 'proceed_to_planning',
+  };
+}
+
+function run(args = process.argv.slice(2), rootDirectory = ROOT) {
+  try {
+    const input = parseArguments(args);
+    const result = evaluateTopics({
+      sources: loadContentSources(rootDirectory),
+      coverageManifest: loadCoverageManifest(rootDirectory),
+      contentCatalog: loadContentCatalog(rootDirectory),
+      ...input,
+    });
+    process.stdout.write(JSON.stringify(result) + '\n');
+    if (result.decision === 'stop_already_complete') process.exitCode = 2;
+  } catch (error) {
+    process.stderr.write(error.message + '\n');
+    process.exitCode = 1;
+  }
+}
+
+if (require.main === module) run();
+
+module.exports = { evaluateTopics, parseArguments, run };
diff --git a/tests/content/t3-publication-preflight.spec.cjs b/tests/content/t3-publication-preflight.spec.cjs
new file mode 100644
index 0000000..94d72c7
--- /dev/null
+++ b/tests/content/t3-publication-preflight.spec.cjs
@@ -0,0 +1,125 @@
+const assert = require('node:assert/strict');
+const path = require('node:path');
+const { spawnSync } = require('node:child_process');
+const {
+  evaluateTopics,
+  parseArguments,
+} = require('../../scripts/t3-publication-preflight.cjs');
+
+const contentSetId = '2026-t3-v1';
+
+function fixtures({ completed = ['tema-pronto'], incomplete = [] } = {}) {
+  const questions = [];
+  completed.forEach((topic) => {
+    for (let index = 0; index < 20; index += 1) {
+      questions.push({
+        contentSetId,
+        topic,
+        reviewStatus: 'published',
+      });
+    }
+  });
+  incomplete.forEach((topic) => {
+    for (let index = 0; index < 8; index += 1) {
+      questions.push({
+        contentSetId,
+        topic,
+        reviewStatus: 'draft',
+      });
+    }
+  });
+  const topics = Object.fromEntries(
+    [...completed, ...incomplete].map((topic) => [topic, 20]),
+  );
+  return {
+    sources: { portugues: { questions } },
+    coverageManifest: {
+      contentSets: { [contentSetId]: { subjects: { portugues: topics } } },
+    },
+    contentCatalog: [{ contentSetId, status: 'published' }],
+  };
+}
+
+function run() {
+  assert.deepEqual(
+    parseArguments([
+      '--subject',
+      'portugues',
+      '--topic',
+      'um',
+      '--topic',
+      'dois',
+    ]),
+    { subject: 'portugues', topics: ['um', 'dois'] },
+  );
+  assert.throws(() => parseArguments([]), /--subject obrigatorio/);
+  assert.throws(
+    () => parseArguments(['--subject', 'portugues']),
+    /informe ao menos um --topic/,
+  );
+  assert.throws(
+    () =>
+      parseArguments([
+        '--subject',
+        'portugues',
+        '--topic',
+        'um',
+        '--topic',
+        'um',
+      ]),
+    /--topic duplicado/,
+  );
+
+  const completed = evaluateTopics({
+    ...fixtures({ completed: ['tema-pronto'] }),
+    subject: 'portugues',
+    topics: ['tema-pronto'],
+  });
+  assert.equal(completed.decision, 'stop_already_complete');
+  assert.equal(completed.topics[0].actual, 20);
+
+  const incomplete = evaluateTopics({
+    ...fixtures({ incomplete: ['tema-aberto'] }),
+    subject: 'portugues',
+    topics: ['tema-aberto'],
+  });
+  assert.equal(incomplete.decision, 'proceed_to_planning');
+  assert.equal(incomplete.topics[0].actual, 8);
+
+  const mixed = evaluateTopics({
+    ...fixtures({ completed: ['tema-pronto'], incomplete: ['tema-aberto'] }),
+    subject: 'portugues',
+    topics: ['tema-pronto', 'tema-aberto'],
+  });
+  assert.equal(mixed.decision, 'stop_already_complete');
+
+  assert.throws(
+    () =>
+      evaluateTopics({
+        ...fixtures(),
+        subject: 'portugues',
+        topics: ['tema-fora-do-manifesto'],
+      }),
+    /tema nao declarado no manifesto T3/,
+  );
+
+  const root = path.resolve(__dirname, '../..');
+  const actual = spawnSync(
+    process.execPath,
+    [
+      path.join(root, 'scripts/t3-publication-preflight.cjs'),
+      '--subject',
+      'portugues',
+      '--topic',
+      'adjetivos',
+    ],
+    { cwd: root, encoding: 'utf8' },
+  );
+  assert.equal(actual.status, 2);
+  assert.match(actual.stdout, /"decision":"stop_already_complete"/);
+  assert.match(actual.stdout, /"actual":20,"expected":20/);
+
+  console.log('t3-publication-preflight: ok');
+}
+
+run();