diff --git a/src/frontend/mcp-server/internal/app.go b/src/frontend/mcp-server/internal/app.go
index 3b8e5d1..c2bc05c 100644
--- a/src/frontend/mcp-server/internal/app.go
+++ b/src/frontend/mcp-server/internal/app.go
@@ -149,11 +149,17 @@ func (a *App) HandlePendReasons(ctx context.Context, req mcp.CallToolRequest) (*
 }
 
 // formatPendJob renders one job's PEND reason, or notes it is not waiting.
+//
+// `id` is the numeric job ID (scheduler_list_jobs' `id` and the value the
+// other per-job tools accept as their `id` param) so a caller can round-trip
+// it into scheduler_get_job/cancel/hold/release. `human_id` is kept for
+// display only — the apiserver rejects dash-form job IDs as query input.
 func formatPendJob(job *sclient.URMJob) map[string]any {
 	pr := parsePendingReason(*job)
 	if pr == nil {
 		return map[string]any{
-			"id":          job.HumanID,
+			"id":          job.ID,
+			"human_id":    job.HumanID,
 			"name":        job.Name,
 			"queue":       job.Queue,
 			"status":      job.Status,
@@ -161,7 +167,8 @@ func formatPendJob(job *sclient.URMJob) map[string]any {
 		}
 	}
 	return map[string]any{
-		"id":          job.HumanID,
+		"id":          job.ID,
+		"human_id":    job.HumanID,
 		"name":        job.Name,
 		"queue":       job.Queue,
 		"status":      job.Status,
diff --git a/src/frontend/mcp-server/internal/pendreason_test.go b/src/frontend/mcp-server/internal/pendreason_test.go
index 4e7fcb5..e19df6f 100644
--- a/src/frontend/mcp-server/internal/pendreason_test.go
+++ b/src/frontend/mcp-server/internal/pendreason_test.go
@@ -71,3 +71,33 @@ func TestPendReasonSummary(t *testing.T) {
 		}
 	}
 }
+
+func TestFormatPendJobIDConsistency(t *testing.T) {
+	job := sclient.URMJob{
+		ID:      "73931152729047040",
+		HumanID: "1-0-1786764804-0",
+		Name:    "sleep 5",
+		Queue:   "normal",
+		Status:  "PEND",
+	}
+	// no pending_reason -> explanation branch
+	out := formatPendJob(&job)
+	if id, _ := out["id"].(string); id != job.ID {
+		t.Errorf("id = %q, want numeric %q (must round-trip into get/cancel/hold)", id, job.ID)
+	}
+	if hid, _ := out["human_id"].(string); hid != job.HumanID {
+		t.Errorf("human_id = %q, want %q", hid, job.HumanID)
+	}
+
+	// with pending_reason -> main branch
+	job.Extensions = map[string]any{
+		"pending_reason": `{"main_reason":3,"main_reason_name":"match_fail","host_reasons":[],"res_reasons":[]}`,
+	}
+	out = formatPendJob(&job)
+	if id, _ := out["id"].(string); id != job.ID {
+		t.Errorf("id (with reason) = %q, want numeric %q", id, job.ID)
+	}
+	if hid, _ := out["human_id"].(string); hid != job.HumanID {
+		t.Errorf("human_id (with reason) = %q, want %q", hid, job.HumanID)
+	}
+}