diff --git a/README.md b/README.md
index 131e5d6..f1c2eb7 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,8 @@ without changing the original training scripts. Starting any web job or
 dataset YOLO shortcut automatically opens its live log; the SSE stream resumes
 from the current log size after the initial tail so existing lines are not
 duplicated in the panel.
+The selected-job panel also shows reproducibility diagnostics: command, cwd,
+PID, exit code, log size, error text, and the exact task params submitted.
 The task builder also reads `GET /api/system/gpus` and lets an operator choose
 CPU or one or more GPUs before launch. Selected GPUs are passed to the backend
 as `gpus`, exported as `CUDA_VISIBLE_DEVICES`, and reflected into YOLO/visual
diff --git a/backend/app/agents/evaluation_agent.py b/backend/app/agents/evaluation_agent.py
index cf3a459..3c7d06a 100644
--- a/backend/app/agents/evaluation_agent.py
+++ b/backend/app/agents/evaluation_agent.py
@@ -61,6 +61,11 @@ def evaluate_project() -> dict:
         and "setResults(resultsNext)" in frontend_text
         and "slice(0, 240)" not in frontend_text,
         "job_progress_ui": "JobProgressBar" in frontend_text and "progressTrack" in frontend_text,
+        "job_diagnostics_ui": "JobDiagnostics" in frontend_text
+        and "jobDiagnostics" in frontend_text
+        and "command?.join" in frontend_text
+        and "job.cwd" in frontend_text
+        and "JSON.stringify(job.params" in frontend_text,
         "gpu_task_selection_ui": "selectedGpuIds" in frontend_text
         and "gpuSelector" in frontend_text
         and "jobPayload" in frontend_text
diff --git a/frontend/src/main.tsx b/frontend/src/main.tsx
index 5ee4dc8..2a3153c 100644
--- a/frontend/src/main.tsx
+++ b/frontend/src/main.tsx
@@ -41,9 +41,15 @@ type Job = {
   type: string;
   status: string;
   description: string;
+  command?: string[];
+  cwd?: string;
+  pid?: number | null;
+  exit_code?: number | null;
+  error?: string | null;
   created_at: string;
   started_at?: string;
   finished_at?: string;
+  log_path?: string;
   log_tail?: string;
   log_size?: number;
   params: Record<string, unknown>;
@@ -1298,6 +1304,7 @@ function App() {
               </button>
             </div>
             {selectedJob && <JobProgressBar progress={selectedJob.progress} />}
+            {selectedJob && <JobDiagnostics job={selectedJob} />}
             <pre>{log || "No log selected."}</pre>
           </div>
 
@@ -1326,6 +1333,37 @@ function App() {
   );
 }
 
+function JobDiagnostics({ job }: { job: Job }) {
+  const command = job.command?.join(" ") ?? "";
+  return (
+    <div className="jobDiagnostics">
+      <div className="jobDetailGrid">
+        <div><span>ID</span><strong>{job.id.slice(0, 12)}</strong></div>
+        <div><span>PID</span><strong>{job.pid ?? "-"}</strong></div>
+        <div><span>Exit</span><strong>{job.exit_code ?? "-"}</strong></div>
+        <div><span>Log</span><strong>{formatBytes(job.log_size)}</strong></div>
+      </div>
+      {job.cwd && (
+        <div className="jobPath">
+          <span>CWD</span>
+          <code>{job.cwd}</code>
+        </div>
+      )}
+      {!!job.error && <div className="jobError">{job.error}</div>}
+      {!!command && (
+        <details className="jobDetailBlock" open>
+          <summary>Command</summary>
+          <pre>{command}</pre>
+        </details>
+      )}
+      <details className="jobDetailBlock">
+        <summary>Params</summary>
+        <pre>{JSON.stringify(job.params ?? {}, null, 2)}</pre>
+      </details>
+    </div>
+  );
+}
+
 function AgentCheckList({ checks, limit }: { checks: AgentCheck[]; limit: number }) {
   if (!checks.length) {
     return <p className="muted">尚未运行验证。</p>;
diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index 8f40c26..ea072d5 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -1346,6 +1346,90 @@ meter {
   white-space: pre-wrap;
 }
 
+.jobDiagnostics {
+  display: grid;
+  gap: 9px;
+  margin-top: 12px;
+}
+
+.jobDetailGrid {
+  display: grid;
+  grid-template-columns: repeat(4, minmax(0, 1fr));
+  gap: 8px;
+}
+
+.jobDetailGrid div {
+  min-width: 0;
+  display: grid;
+  gap: 3px;
+  padding: 8px;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  background: #080a08;
+}
+
+.jobDetailGrid span,
+.jobPath span {
+  color: var(--muted);
+  font-size: 11px;
+}
+
+.jobDetailGrid strong {
+  min-width: 0;
+  color: var(--ink);
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.jobPath {
+  min-width: 0;
+  display: grid;
+  gap: 4px;
+}
+
+.jobPath code {
+  display: block;
+  padding: 8px;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  background: #080a08;
+  color: var(--muted);
+  overflow-wrap: anywhere;
+}
+
+.jobError {
+  padding: 8px;
+  border: 1px solid rgba(240, 113, 103, 0.45);
+  border-radius: 6px;
+  color: var(--red);
+  background: rgba(240, 113, 103, 0.08);
+  overflow-wrap: anywhere;
+}
+
+.jobDetailBlock {
+  min-width: 0;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  background: #080a08;
+}
+
+.jobDetailBlock summary {
+  cursor: pointer;
+  padding: 8px;
+  color: var(--green);
+  font-size: 12px;
+}
+
+.jobDetailBlock pre {
+  min-height: 0;
+  max-height: 180px;
+  margin: 0;
+  border-width: 1px 0 0;
+  border-radius: 0;
+  overflow-wrap: anywhere;
+}
+
 .curvePanel {
   display: grid;
   gap: 10px;
@@ -1479,6 +1563,7 @@ meter {
   .gpuPicker,
   .taskCheckList,
   .agentCheckList,
+  .jobDetailGrid,
   .qualityStats,
   .qualityChecks {
     grid-template-columns: repeat(2, minmax(0, 1fr));