diff --git a/backend/app/api/ml_admin.py b/backend/app/api/ml_admin.py
index 62fbc26..c146b70 100644
--- a/backend/app/api/ml_admin.py
+++ b/backend/app/api/ml_admin.py
@@ -8,6 +8,26 @@ from ..models import MLSettings
 ml_admin_bp = Blueprint("ml_admin", __name__, url_prefix="/api/ml")
 
 
+# Crop-proposer / detector config (#134). Announced to the GPU agent in the lease
+# → tunable here with no restart. weights = ultralytics name | URL | hf_repo::file
+# (empty, or enabled off, skips that proposer).
+_DETECTOR_FIELDS = (
+    "detector_person_enabled",
+    "detector_person_weights",
+    "detector_person_conf",
+    "detector_anatomy_enabled",
+    "detector_anatomy_weights",
+    "detector_anatomy_conf",
+    "detector_panel_enabled",
+    "detector_panel_weights",
+    "detector_panel_conf",
+    "detector_max_figures",
+    "detector_max_components",
+    "detector_max_panels",
+    "detector_max_regions",
+    "detector_dedupe_iou",
+)
+
 _EDITABLE = (
     "cpu_embed_enabled",
     "video_frame_interval_seconds",
@@ -21,6 +41,7 @@ _EDITABLE = (
     "ccip_auto_apply_threshold",
     "embedder_model_name",
     "embedder_model_version",
+    *_DETECTOR_FIELDS,
 )
 
 
@@ -76,6 +97,7 @@ async def get_settings():
             "ccip_auto_apply_enabled": s.ccip_auto_apply_enabled,
             "ccip_auto_apply_threshold": s.ccip_auto_apply_threshold,
             "embedder_model_name": s.embedder_model_name,
+            **{f: getattr(s, f) for f in _DETECTOR_FIELDS},
         }
     )
 
@@ -133,6 +155,19 @@ def _validate(p: dict) -> str | None:
     for key in ("embedder_model_name", "embedder_model_version"):
         if not str(p[key]).strip():
             return f"{key} must not be empty"
+    # Crop proposers (#134). Weights may be empty (that proposer is just off);
+    # confidences are probabilities; caps are positive counts; IoU is [0,1].
+    for key in ("detector_person_conf", "detector_anatomy_conf", "detector_panel_conf"):
+        if not (0.0 <= float(p[key]) <= 1.0):
+            return f"{key} must be between 0 and 1"
+    for key in (
+        "detector_max_figures", "detector_max_components",
+        "detector_max_panels", "detector_max_regions",
+    ):
+        if int(p[key]) < 1:
+            return f"{key} must be >= 1"
+    if not (0.0 <= float(p["detector_dedupe_iou"]) <= 1.0):
+        return "detector_dedupe_iou must be between 0 and 1"
     return None
 
 
diff --git a/frontend/src/components/settings/CropProposersCard.vue b/frontend/src/components/settings/CropProposersCard.vue
new file mode 100644
index 0000000..46edd54
--- /dev/null
+++ b/frontend/src/components/settings/CropProposersCard.vue
@@ -0,0 +1,151 @@
+<template>
+  <MaintenanceTile
+    icon="mdi-crop"
+    title="Crop proposers (where to crop)"
+    blurb="Detectors that decide WHERE to crop each image before embedding — general figures, anime/furry anatomy, and comic panels — so a tag can ground to a region, not just the whole image."
+    :open="false"
+  >
+    <p class="fc-muted text-body-2 mb-4">
+      Each proposer finds regions that the crop → SigLIP bag scores alongside the
+      whole image; the best-scoring region is what grounds a tag. Weights accept
+      an <strong>ultralytics name</strong> (<code>yolo11n.pt</code>), a
+      <strong>URL</strong>, or <strong>hf_repo::file</strong>. Edits reach the GPU
+      agent on its next lease — no restart. After turning a proposer on, re-process
+      the library so existing images gain its regions.
+    </p>
+
+    <div v-for="p in proposers" :key="p.key" class="fc-proposer">
+      <div class="d-flex align-center mb-1" style="gap: 10px;">
+        <v-icon size="18" :color="p.on ? 'accent' : undefined">{{ p.icon }}</v-icon>
+        <span class="fc-section-h">{{ p.label }}</span>
+        <v-switch
+          v-model="p.on" :loading="busy" hide-details density="compact"
+          color="success" class="ml-auto"
+          @update:model-value="v => saveToggle(p, v)"
+        />
+      </div>
+      <p class="fc-muted text-body-2 mb-2">{{ p.help }}</p>
+      <div class="d-flex flex-wrap mb-4" style="gap: 12px;">
+        <v-text-field
+          v-model="p.weights" label="Weights" density="compact" hide-details
+          style="min-width: 300px; flex: 1;" :disabled="busy || !p.on"
+          placeholder="name | URL | hf_repo::file"
+          @change="save({ [`detector_${p.key}_weights`]: p.weights })"
+        />
+        <v-text-field
+          v-model.number="p.conf" label="Confidence" type="number"
+          min="0" max="1" step="0.05" density="compact" hide-details
+          style="max-width: 140px;" :disabled="busy || !p.on"
+          @change="save({ [`detector_${p.key}_conf`]: Number(p.conf) })"
+        />
+      </div>
+    </div>
+
+    <div class="fc-caps">
+      <div class="fc-section-h mb-1">Caps</div>
+      <p class="fc-muted text-body-2 mb-3">
+        Bound how many crops each image can produce — protects GPU time and
+        storage. Dedupe IoU drops near-duplicate crops before embedding.
+      </p>
+      <div class="d-flex flex-wrap" style="gap: 12px;">
+        <v-text-field
+          v-for="c in caps" :key="c.key"
+          v-model.number="c.val" :label="c.label" type="number"
+          :min="c.min" :max="c.max" :step="c.step || 1" density="compact"
+          hide-details style="max-width: 165px;" :disabled="busy"
+          @change="save({ [c.key]: Number(c.val) })"
+        />
+      </div>
+    </div>
+  </MaintenanceTile>
+</template>
+
+<script setup>
+import { toast } from '../../utils/toast.js'
+import { onMounted, ref } from 'vue'
+
+import MaintenanceTile from '../common/MaintenanceTile.vue'
+import { useMLStore } from '../../stores/ml.js'
+
+const mlSettings = useMLStore()
+const busy = ref(false)
+const proposers = ref([])
+const caps = ref([])
+
+// Static copy per proposer; the mutable state (on/weights/conf) is seeded from
+// settings on mount so the card reflects the live DB config (rule 26 — it works
+// untouched).
+const DEFS = [
+  {
+    key: 'person', label: 'Figures (person)', icon: 'mdi-account-outline',
+    help: 'General figure detector for the Western/realistic art the anime ' +
+      'detector misses → character identity + a whole-figure crop.',
+  },
+  {
+    key: 'anatomy', label: 'Anatomy (booru)', icon: 'mdi-dog-side',
+    help: 'Anime / furry / NSFW torso components (heads, busts, hips, …) → ' +
+      'localized concept crops.',
+  },
+  {
+    key: 'panel', label: 'Comic panels', icon: 'mdi-view-grid-outline',
+    help: 'Splits a comic page into its panels → one concept crop each.',
+  },
+]
+const CAP_DEFS = [
+  { key: 'detector_max_figures', label: 'Max figures', min: 1 },
+  { key: 'detector_max_components', label: 'Max components', min: 1 },
+  { key: 'detector_max_panels', label: 'Max panels', min: 1 },
+  { key: 'detector_max_regions', label: 'Max regions / job', min: 1 },
+  { key: 'detector_dedupe_iou', label: 'Dedupe IoU', min: 0, max: 1, step: 0.05 },
+]
+
+onMounted(async () => {
+  try { await mlSettings.loadSettings() } catch { /* non-fatal — defaults show */ }
+  const s = mlSettings.settings || {}
+  proposers.value = DEFS.map(d => ({
+    ...d,
+    on: !!s[`detector_${d.key}_enabled`],
+    weights: s[`detector_${d.key}_weights`] ?? '',
+    conf: s[`detector_${d.key}_conf`] ?? 0.3,
+  }))
+  caps.value = CAP_DEFS.map(c => ({ ...c, val: s[c.key] ?? 0 }))
+})
+
+async function save(patch, revert) {
+  busy.value = true
+  try {
+    await mlSettings.patchSettings(patch)
+    toast({ text: 'Saved', type: 'success' })
+  } catch (e) {
+    if (revert) revert()
+    toast({ text: `Could not save: ${e.message}`, type: 'error' })
+  } finally {
+    busy.value = false
+  }
+}
+
+function saveToggle (p, v) {
+  // Revert the switch on failure so it never lies about the persisted state.
+  save({ [`detector_${p.key}_enabled`]: !!v }, () => { p.on = !v })
+}
+</script>
+
+<style scoped>
+.fc-muted { color: rgb(var(--v-theme-on-surface-variant)); }
+.fc-section-h {
+  font-size: 13px; font-weight: 700; letter-spacing: 0.03em;
+  text-transform: uppercase; color: rgb(var(--v-theme-on-surface));
+}
+.fc-proposer {
+  border-top: 1px solid rgb(var(--v-theme-surface-light)); padding-top: 14px;
+}
+.fc-proposer:first-of-type { border-top: none; padding-top: 0; }
+.fc-caps {
+  border-top: 1px solid rgb(var(--v-theme-surface-light)); padding-top: 16px;
+}
+code {
+  font-family: 'JetBrains Mono', monospace; font-size: 0.85em;
+  background: rgb(var(--v-theme-surface-light)); padding: 1px 5px;
+  border-radius: 4px;
+}
+</style>
diff --git a/frontend/src/components/settings/MaintenancePanel.vue b/frontend/src/components/settings/MaintenancePanel.vue
index 26cae1f..dfc5693 100644
--- a/frontend/src/components/settings/MaintenancePanel.vue
+++ b/frontend/src/components/settings/MaintenancePanel.vue
@@ -36,6 +36,7 @@
       </p>
       <div class="fc-tile-stack">
         <MLThresholdSliders />
+        <CropProposersCard />
         <HeadsCard />
         <AliasTable />
       </div>
@@ -75,6 +76,7 @@ import MissingFileRepairCard from './MissingFileRepairCard.vue'
 import GpuTriageCard from './GpuTriageCard.vue'
 import DbMaintenanceCard from './DbMaintenanceCard.vue'
 import MLThresholdSliders from './MLThresholdSliders.vue'
+import CropProposersCard from './CropProposersCard.vue'
 import HeadsCard from './HeadsCard.vue'
 import GpuAgentCard from './GpuAgentCard.vue'
 import AliasTable from './AliasTable.vue'
diff --git a/tests/test_api_ml_admin.py b/tests/test_api_ml_admin.py
index 5602f8c..33faf09 100644
--- a/tests/test_api_ml_admin.py
+++ b/tests/test_api_ml_admin.py
@@ -52,6 +52,35 @@ async def test_embedder_model_default_settable_and_empty_rejected(client):
     assert bad.status_code == 400
 
 
+@pytest.mark.asyncio
+async def test_detector_settings_defaults_patch_and_validation(client):
+    # #134: crop-proposer config is exposed + editable here (announced to the
+    # agent via the lease). Defaults are all-on with the pinned weights.
+    body = await (await client.get("/api/ml/settings")).get_json()
+    assert body["detector_person_enabled"] is True
+    assert body["detector_anatomy_enabled"] is True
+    assert "yolov11m_aa22" in body["detector_anatomy_weights"]
+    assert body["detector_panel_weights"].endswith("::best.pt")
+    assert body["detector_max_regions"] == 128
+
+    ok = await client.patch("/api/ml/settings", json={
+        "detector_anatomy_enabled": False,
+        "detector_person_conf": 0.5,
+        "detector_max_panels": 4,
+    })
+    assert ok.status_code == 200
+    out = await ok.get_json()
+    assert out["detector_anatomy_enabled"] is False
+    assert out["detector_person_conf"] == 0.5
+    assert out["detector_max_panels"] == 4
+
+    # Out-of-range confidence + non-positive cap are rejected.
+    assert (await client.patch(
+        "/api/ml/settings", json={"detector_panel_conf": 1.5})).status_code == 400
+    assert (await client.patch(
+        "/api/ml/settings", json={"detector_max_regions": 0})).status_code == 400
+
+
 @pytest.mark.asyncio
 async def test_embedder_models_list(client):
     # #1203: the dropdown reads the supported-model list from the server.