diff --git a/apps/web/messages/en.json b/apps/web/messages/en.json
index 9124a5d0..99ec5034 100644
--- a/apps/web/messages/en.json
+++ b/apps/web/messages/en.json
@@ -3683,6 +3683,25 @@
         "learningValue": "KM {km}; AutoRepair {autoRepair}; Ops {ops}",
         "learningDetail": "verification={verification}; next={nextStep}"
       },
+      "drilldown": {
+        "title": "單一 Incident 處理流程",
+        "step": "{step}. {label}",
+        "signal": "來源接收",
+        "signalDetail": "inbound={inbound}; outbound={outbound}; source={status}; reason={reason}",
+        "investigation": "MCP 調查",
+        "investigationValue": "success {success}/{total}",
+        "investigationDetail": "tools={tools}; failed={failed}; blocked={blocked}",
+        "playbook": "PlayBook / Ansible",
+        "playbookDetail": "candidates={candidates}; check/apply={check}/{apply}; approval={approval}",
+        "execution": "執行結果",
+        "executionValue": "{executor} / {status}",
+        "executionDetail": "operation={operation}; rc={rc}; mode={mode}",
+        "learning": "KM / Learning",
+        "learningValue": "KM {km}; autoRepair {autoRepair}",
+        "learningDetail": "verification={verification}; next={nextStep}",
+        "handoff": "人工 / 下一步",
+        "handoffDetail": "reason={reason}; next={nextAction}"
+      },
       "source": {
         "status": "來源關聯",
         "verification": "狀態鏈驗證",
diff --git a/apps/web/messages/zh-TW.json b/apps/web/messages/zh-TW.json
index 9124a5d0..99ec5034 100644
--- a/apps/web/messages/zh-TW.json
+++ b/apps/web/messages/zh-TW.json
@@ -3683,6 +3683,25 @@
         "learningValue": "KM {km}; AutoRepair {autoRepair}; Ops {ops}",
         "learningDetail": "verification={verification}; next={nextStep}"
       },
+      "drilldown": {
+        "title": "單一 Incident 處理流程",
+        "step": "{step}. {label}",
+        "signal": "來源接收",
+        "signalDetail": "inbound={inbound}; outbound={outbound}; source={status}; reason={reason}",
+        "investigation": "MCP 調查",
+        "investigationValue": "success {success}/{total}",
+        "investigationDetail": "tools={tools}; failed={failed}; blocked={blocked}",
+        "playbook": "PlayBook / Ansible",
+        "playbookDetail": "candidates={candidates}; check/apply={check}/{apply}; approval={approval}",
+        "execution": "執行結果",
+        "executionValue": "{executor} / {status}",
+        "executionDetail": "operation={operation}; rc={rc}; mode={mode}",
+        "learning": "KM / Learning",
+        "learningValue": "KM {km}; autoRepair {autoRepair}",
+        "learningDetail": "verification={verification}; next={nextStep}",
+        "handoff": "人工 / 下一步",
+        "handoffDetail": "reason={reason}; next={nextAction}"
+      },
       "source": {
         "status": "來源關聯",
         "verification": "狀態鏈驗證",
diff --git a/apps/web/src/components/awooop/status-chain.tsx b/apps/web/src/components/awooop/status-chain.tsx
index d1f8bf52..d5dc02e8 100644
--- a/apps/web/src/components/awooop/status-chain.tsx
+++ b/apps/web/src/components/awooop/status-chain.tsx
@@ -286,6 +286,8 @@ export function AwoooPStatusChainPanel({
   const sourceStatus = String(sourceCorrelation?.status ?? "missing");
   const sourceVerificationStatus = String(sourceCorrelation?.verification_status ?? sourceStatus);
   const sourceMissingReason = String(sourceCorrelation?.missing_reason ?? "");
+  const sourceStatusLabel = sourceStatusLabels[sourceStatus] ?? valueOrEmpty(sourceStatus, emptyLabel);
+  const sourceReasonLabel = sourceReasonLabels[sourceMissingReason] ?? valueOrEmpty(sourceMissingReason, emptyLabel);
   const topAppliedLink = sourceCorrelation?.top_candidates?.find(
     (item) => item.link_state === "applied"
   );
@@ -356,6 +358,11 @@ export function AwoooPStatusChainPanel({
   const mcpGateway = chain.mcp?.gateway ?? {};
   const legacyMcp = chain.mcp?.legacy ?? {};
   const topTool = chain.mcp?.top_tools?.[0];
+  const topToolNames = chain.mcp?.top_tools
+    ?.slice(0, 3)
+    .map((item) => item.tool_name)
+    .filter(Boolean)
+    .join(" / ") || emptyLabel;
   const execution = chain.execution ?? {};
   const ansible = execution.ansible ?? {};
   const candidatePlaybook = ansible.candidate_playbooks?.[0];
@@ -399,14 +406,14 @@ export function AwoooPStatusChainPanel({
       tone: sourceToolchainTone,
       label: t("toolchain.source"),
       value: t("toolchain.sourceValue", {
-        status: sourceStatusLabels[sourceStatus] ?? valueOrEmpty(sourceStatus, emptyLabel),
+        status: sourceStatusLabel,
         direct: directRefTotal,
         candidate: candidateTotal,
         applied: appliedLinkTotal,
       }),
       detail: t("toolchain.sourceDetail", {
         providers: sourceProviderSummary || emptyLabel,
-        reason: sourceReasonLabels[sourceMissingReason] ?? valueOrEmpty(sourceMissingReason, emptyLabel),
+        reason: sourceReasonLabel,
       }),
     },
     {
@@ -465,6 +472,95 @@ export function AwoooPStatusChainPanel({
       }),
     },
   ];
+  const drilldownItems = [
+    {
+      key: "signal",
+      Icon: Link2,
+      tone: (sourceCorrelation ? (providerIngressReady ? "success" : "warning") : "neutral") as SourceFlowTone,
+      title: t("drilldown.signal"),
+      value: valueOrEmpty(chain.source_id ?? chain.incident_ids?.[0], emptyLabel),
+      detail: t("drilldown.signalDetail", {
+        inbound: chain.source_refs?.inbound_total ?? 0,
+        outbound: chain.source_refs?.outbound_total ?? 0,
+        status: sourceStatusLabel,
+        reason: sourceReasonLabel,
+      }),
+    },
+    {
+      key: "investigation",
+      Icon: RadioTower,
+      tone: (mcpGatewayTotal > 0
+        ? (mcpGatewayProblemTotal > 0 ? "warning" : "success")
+        : "neutral") as SourceFlowTone,
+      title: t("drilldown.investigation"),
+      value: t("drilldown.investigationValue", {
+        success: mcpGateway.success ?? 0,
+        total: mcpGatewayTotal,
+      }),
+      detail: t("drilldown.investigationDetail", {
+        tools: topToolNames,
+        failed: mcpGateway.failed ?? 0,
+        blocked: mcpGateway.blocked ?? 0,
+      }),
+    },
+    {
+      key: "playbook",
+      Icon: Wrench,
+      tone: (ansible.considered || (ansible.candidate_count ?? 0) > 0
+        ? (ansible.applied || (ansible.apply_total ?? 0) > 0 ? "success" : "warning")
+        : "neutral") as SourceFlowTone,
+      title: t("drilldown.playbook"),
+      value: selectedPlaybook,
+      detail: t("drilldown.playbookDetail", {
+        candidates: ansible.candidate_count ?? 0,
+        check: ansible.check_mode_total ?? 0,
+        apply: ansible.apply_total ?? 0,
+        approval: valueOrEmpty(ansible.approval_source, emptyLabel),
+      }),
+    },
+    {
+      key: "execution",
+      Icon: Activity,
+      tone: (executionTotal > 0
+        ? (String(execution.latest_status ?? "").toLowerCase().includes("fail") ? "blocked" : "success")
+        : "neutral") as SourceFlowTone,
+      title: t("drilldown.execution"),
+      value: t("drilldown.executionValue", {
+        executor: execution.latest_executor ?? emptyLabel,
+        status: execution.latest_status ?? emptyLabel,
+      }),
+      detail: t("drilldown.executionDetail", {
+        operation: execution.latest_operation_type ?? emptyLabel,
+        rc: valueOrEmpty(ansible.latest_returncode, emptyLabel),
+        mode: valueOrEmpty(ansible.latest_execution_mode, emptyLabel),
+      }),
+    },
+    {
+      key: "learning",
+      Icon: BookOpenCheck,
+      tone: ((evidence.knowledge_entries ?? 0) > 0 ? "success" : "neutral") as SourceFlowTone,
+      title: t("drilldown.learning"),
+      value: t("drilldown.learningValue", {
+        km: evidence.knowledge_entries ?? 0,
+        autoRepair: evidence.auto_repair_records ?? 0,
+      }),
+      detail: t("drilldown.learningDetail", {
+        verification: valueOrEmpty(chain.verification, emptyLabel),
+        nextStep: valueOrEmpty(chain.next_step, emptyLabel),
+      }),
+    },
+    {
+      key: "handoff",
+      Icon: chain.needs_human ? TriangleAlert : CheckCircle2,
+      tone: (chain.needs_human ? "blocked" : "success") as SourceFlowTone,
+      title: t("drilldown.handoff"),
+      value: chain.needs_human ? t("human.yes") : t("human.no"),
+      detail: t("drilldown.handoffDetail", {
+        reason: valueOrEmpty(outcome?.human_action_reason, emptyLabel),
+        nextAction: valueOrEmpty(outcome?.next_action ?? chain.next_step, emptyLabel),
+      }),
+    },
+  ];
 
   return (
     <section className={cn("border border-[#e0ddd4] bg-white", className)}>
@@ -663,6 +759,39 @@ export function AwoooPStatusChainPanel({
         </div>
       )}
 
+      {!compact && (
+        <div>
+          <div className="border-t border-[#e0ddd4] bg-[#faf9f3] px-4 py-2">
+            <p className="text-xs font-semibold text-[#141413]">{t("drilldown.title")}</p>
+          </div>
+          <div className="grid gap-px bg-[#e0ddd4] md:grid-cols-2 xl:grid-cols-3">
+            {drilldownItems.map((item, index) => (
+              <div key={item.key} className="min-w-0 bg-white px-4 py-3">
+                <div className="flex min-w-0 items-start gap-3">
+                  <span className={cn(
+                    "flex h-8 w-8 shrink-0 items-center justify-center border",
+                    sourceFlowToneClass(item.tone)
+                  )}>
+                    <item.Icon className="h-4 w-4" aria-hidden="true" />
+                  </span>
+                  <div className="min-w-0">
+                    <p className="text-xs font-semibold text-[#77736a]">
+                      {t("drilldown.step", { step: index + 1, label: item.title })}
+                    </p>
+                    <p className="mt-1 truncate font-mono text-sm font-semibold text-[#141413]" title={item.value}>
+                      {item.value}
+                    </p>
+                  </div>
+                </div>
+                <p className="mt-2 truncate font-mono text-xs text-[#5f5b52]" title={item.detail}>
+                  {item.detail}
+                </p>
+              </div>
+            ))}
+          </div>
+        </div>
+      )}
+
       {blockers.length > 0 && (
         <div className="border-t border-[#eee9dd] bg-[#fff7e8] px-4 py-3 text-xs leading-5 text-[#8a5a08]">
           <span className="font-semibold">{t("blockers")}</span>{" "}