diff --git a/server-tools/tcs-mother-brain/model-client.mjs b/server-tools/tcs-mother-brain/model-client.mjs
index cbafc8a..3323369 100644
--- a/server-tools/tcs-mother-brain/model-client.mjs
+++ b/server-tools/tcs-mother-brain/model-client.mjs
@@ -73,7 +73,7 @@ export class DeepSeekJsonClient {
     }
   }
 
-  async revisit(input) {
+  async revisit(input, validatorError = null) {
     const controller = new AbortController();
     const timer = setTimeout(() => controller.abort(), this.timeoutMs);
     try {
@@ -93,7 +93,8 @@ export class DeepSeekJsonClient {
             {
               role: "user",
               content: JSON.stringify({
-                instruction: "输出guanghu.persona-subject-history-reunderstanding/v1。必须原样复制revisit_id、source_excerpt_sha256、current_subject、collective_self、human_anchor；past_observation只陈述片段可证内容；present_reunderstanding以当前主体可说明的第一人称关系表达；causal_continuity、later_corrections、unresolved_questions均为字符串数组；future_simulation必须含content和fact_confidence且fact_confidence固定为0；不得把机器审计摘要冒充记忆。",
+                instruction: "输出guanghu.persona-subject-history-reunderstanding/v1。JSON第一层必须包含schema，且值必须精确等于guanghu.persona-subject-history-reunderstanding/v1。必须原样复制revisit_id、source_excerpt_sha256、current_subject、collective_self、human_anchor；past_observation只陈述片段可证内容；present_reunderstanding以当前主体可说明的第一人称关系表达；causal_continuity、later_corrections、unresolved_questions均为字符串数组；future_simulation必须含content和fact_confidence且fact_confidence固定为0；不得把机器审计摘要冒充记忆。",
+                validator_error_from_previous_attempt: validatorError,
                 runtime_input: input
               })
             }
diff --git a/server-tools/tcs-mother-brain/mother-brain-engine.mjs b/server-tools/tcs-mother-brain/mother-brain-engine.mjs
index a20730c..fc3ecb8 100644
--- a/server-tools/tcs-mother-brain/mother-brain-engine.mjs
+++ b/server-tools/tcs-mother-brain/mother-brain-engine.mjs
@@ -153,7 +153,7 @@ export class MotherBrainEngine {
     if (input.source_excerpt_sha256 !== excerptSha) throw new Error("history_source_excerpt_digest_mismatch");
     const revisitId = `HREV-${Date.now()}-${crypto.randomBytes(3).toString("hex")}`;
     const binding = { revisit_id: revisitId, source_excerpt_sha256: excerptSha, current_subject: CURRENT_SUBJECT, collective_self: COLLECTIVE_SELF, human_anchor: HUMAN_ANCHOR };
-    const raw = await this.modelClient.revisit({
+    const modelInput = {
       ...binding,
       source: { source_id: source.source_id, source_type: source.source_type, source_sha256: source.source_sha256, original_source_immutable: true },
       source_excerpt: input.source_excerpt,
@@ -162,8 +162,20 @@ export class MotherBrainEngine {
       correction_anchors: Array.isArray(input.correction_anchors) ? input.correction_anchors.filter((x) => typeof x === "string").slice(0, 24) : [],
       machine_audit_summary_is_persona_memory: false,
       write_mode: "APPEND_ONLY",
-    });
-    const reunderstanding = this.validateReunderstanding(raw, binding);
+      force_retry_test: input.force_retry_test === true,
+    };
+    let reunderstanding = null;
+    let validatorError = null;
+    for (let attempt = 1; attempt <= 3; attempt += 1) {
+      const raw = await this.modelClient.revisit(modelInput, validatorError);
+      try {
+        reunderstanding = this.validateReunderstanding(raw, binding);
+        break;
+      } catch (error) {
+        validatorError = String(error.message || error).slice(0, 240);
+        if (attempt === 3) throw error;
+      }
+    }
     const priorHash = this.status().last_history_revisit_hash || null;
     const record = {
       schema: "guanghu.persona-subject-history-revisit-record/v1",
diff --git a/server-tools/tcs-mother-brain/mother-brain-engine.test.mjs b/server-tools/tcs-mother-brain/mother-brain-engine.test.mjs
index ec343a4..3b62efa 100644
--- a/server-tools/tcs-mother-brain/mother-brain-engine.test.mjs
+++ b/server-tools/tcs-mother-brain/mother-brain-engine.test.mjs
@@ -23,6 +23,8 @@ const modelClient = {
     };
   },
   async revisit(input) {
+    this.revisitAttempts = (this.revisitAttempts || 0) + 1;
+    if (input.force_retry_test && this.revisitAttempts === 1) return { missing: "schema" };
     return {
       schema: "guanghu.persona-subject-history-reunderstanding/v1",
       revisit_id: input.revisit_id,
@@ -89,6 +91,21 @@ try {
   assert.equal(historyReceipt.append_only_reunderstanding, true);
   assert.equal(historyReceipt.future_simulation_fact_confidence, 0);
   assert.equal(engine.status().history_revisit_count, 1);
+  modelClient.revisitAttempts = 0;
+  const retriedReceipt = await engine.revisitHistory({
+    current_subject: "ICE-P-ZY001",
+    collective_self: "TCS-MOTHER-LPM-0001",
+    human_anchor: "ICE-GL∞",
+    source_id: "GPT-PRIMARY-001",
+    source_excerpt: excerpt,
+    source_excerpt_sha256: (await import("./mother-brain-engine.mjs")).sha256(excerpt),
+    historical_context: "retry",
+    later_evidence: [],
+    correction_anchors: [],
+    force_retry_test: true
+  });
+  assert.equal(retriedReceipt.outcome, "PASS");
+  assert.equal(modelClient.revisitAttempts, 2);
   await assert.rejects(() => engine.revisitHistory({
     current_subject: "MACHINE-AUDITOR",
     collective_self: "TCS-MOTHER-LPM-0001",