diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02c0255d..7341aa1c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,13 @@
 
 # Changelog
 
+## Sprint 136 Guided calibration summary export (2026-07-08)
+
+- Added a Detection Lab `Download calibration summary` action for guided calibration rows.
+- The exported JSON includes thresholds, persisted analysis run IDs, job IDs, quality check IDs, metrics and evidence GeoJSON URLs for successful rows.
+- Reused browser-side JSON download behavior only; no backend endpoint, API contract, migration, model, provider or inference behavior changed.
+- Added regression coverage for the summary export wiring.
+
 ## Sprint 135 Calibration evidence handoff (2026-07-08)
 
 - Added a guided-calibration table action that opens the persisted QA/QC evidence map for successful threshold rows.
diff --git a/backend/tests/test_sprint136_calibration_summary_export_ui.py b/backend/tests/test_sprint136_calibration_summary_export_ui.py
new file mode 100644
index 00000000..bfaae507
--- /dev/null
+++ b/backend/tests/test_sprint136_calibration_summary_export_ui.py
@@ -0,0 +1,23 @@
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+def test_guided_calibration_runner_exports_review_summary() -> None:
+    lab = ROOT / "frontend" / "src" / "components" / "detection" / "DetectionLab.tsx"
+    todo = ROOT / "docs" / "TODO.md"
+
+    lab_source = lab.read_text(encoding="utf-8")
+    todo_source = todo.read_text(encoding="utf-8")
+
+    assert "downloadCalibrationSummary" in lab_source
+    assert "buildCalibrationSummaryExport" in lab_source
+    assert "downloadJsonFile('detection-calibration-summary.json'" in lab_source
+    assert "evidence_geojson_url" in lab_source
+    assert "/api/v1/projects/${projectId}/quality-checks/${row.quality_check_id}/evidence/geojson" in lab_source
+    assert "Download calibration summary" in lab_source
+    assert "disabled={detectionCalibrationRows.length === 0 || !selectedProjectId}" in lab_source
+    assert "calibration_thresholds" in lab_source
+    assert "quality_check_ids" in lab_source
+    assert "[x] Add guided calibration summary export from the Detection Lab" in todo_source
diff --git a/docs/CODEX_EXECUTION_LOG.md b/docs/CODEX_EXECUTION_LOG.md
index 12c64987..18ba9696 100644
--- a/docs/CODEX_EXECUTION_LOG.md
+++ b/docs/CODEX_EXECUTION_LOG.md
@@ -1,3 +1,28 @@
+## Sprint 136 Guided calibration summary export (2026-07-08)
+
+Changed:
+- Added a `Download calibration summary` action to the guided Detection Lab calibration progress table.
+- The client-side JSON export includes calibration thresholds, persisted `analysis_run_id`, `job_id`, `quality_check_id`, metric values and QA evidence GeoJSON URLs.
+- Added compact action-row styling and regression coverage in `backend/tests/test_sprint136_calibration_summary_export_ui.py`.
+- Updated `CHANGELOG.md` and `docs/TODO.md`.
+
+Tested:
+- Red step: `python -m pytest backend\tests\test_sprint136_calibration_summary_export_ui.py -q` failed while the summary export helpers and button were absent.
+- `python -m pytest backend\tests\test_sprint136_calibration_summary_export_ui.py backend\tests\test_sprint135_calibration_evidence_handoff.py backend\tests\test_sprint134_guided_detection_calibration_runner.py -q` (`3 passed`)
+- `python -m compileall backend/app`
+- `cd frontend && npm run typecheck`
+- `cd frontend && npm run build`
+- `bash scripts/run_readiness_check.sh` (`415 passed`; frontend typecheck/build passed; Alembic head `202606120900`; live smoke syntax passed)
+
+Open:
+- Live Tower deploy validation still needs to run for this pass.
+
+Limitations:
+- This is a browser-side summary export only. It does not create server-side export records, rerun inference, create new QA metrics, promote thresholds, mutate model configuration, download models, add provider fetching or change API/database contracts.
+
+Next recommended pass:
+- Add a small import/consume path for downloaded calibration summaries in the existing operator evidence bundle script, so browser-exported summary JSON can be used directly from an operator workstation.
+
 ## Sprint 135 Calibration evidence handoff (2026-07-08)
 
 Changed:
diff --git a/docs/TODO.md b/docs/TODO.md
index 76015612..dc001def 100644
--- a/docs/TODO.md
+++ b/docs/TODO.md
@@ -422,5 +422,6 @@ This file now starts with the current implementation status. Older preparation/b
 - [x] Add full threshold calibration comparison UX so detection runs can compare candidate thresholds before promotion.
 - [x] Add guided in-app detection calibration runner for explicit threshold sweeps.
 - [x] Link guided calibration rows to the QA evidence map.
+- [x] Add guided calibration summary export from the Detection Lab.
 - [ ] Add more AOIs after the tile-level baseline so the next local model attempt is not limited to Geel/Mol/Turnhout.
 - [ ] Add negative/background AOIs so the next tile dataset is not all positive tiles.
diff --git a/frontend/src/components/detection/DetectionLab.tsx b/frontend/src/components/detection/DetectionLab.tsx
index 3608f437..57553e11 100644
--- a/frontend/src/components/detection/DetectionLab.tsx
+++ b/frontend/src/components/detection/DetectionLab.tsx
@@ -571,7 +571,17 @@ export function DetectionLab({
                 <h3>Calibration run progress</h3>
                 <p className="muted">Each row is backed by a persisted detection run and QA check when successful.</p>
               </div>
-              <span className="count-pill">{detectionCalibrationRows.length} thresholds</span>
+              <div className="panel-action-row">
+                <span className="count-pill">{detectionCalibrationRows.length} thresholds</span>
+                <button
+                  className="secondary-action"
+                  type="button"
+                  onClick={() => downloadCalibrationSummary(selectedProjectId, detectionCalibrationRows)}
+                  disabled={detectionCalibrationRows.length === 0 || !selectedProjectId}
+                >
+                  Download calibration summary
+                </button>
+              </div>
             </div>
             <div className="table-scroll">
               <table>
@@ -940,6 +950,51 @@ function stringFromRecord(record: Record<string, unknown> | null | undefined, ke
   return typeof value === 'string' && value.trim().length > 0 ? value : null
 }
 
+function buildCalibrationSummaryExport(projectId: string, rows: DetectionCalibrationRunRow[]): Record<string, unknown> {
+  const successfulRows = rows.filter((row) => row.status === 'success')
+  return {
+    export_type: 'detection_calibration_summary',
+    project_id: projectId,
+    created_at: new Date().toISOString(),
+    calibration_thresholds: rows.map((row) => row.threshold),
+    quality_check_ids: successfulRows.map((row) => row.quality_check_id).filter(Boolean),
+    rows: rows.map((row) => ({
+      threshold: row.threshold,
+      status: row.status,
+      analysis_run_id: row.analysis_run_id ?? null,
+      job_id: row.job_id ?? null,
+      quality_check_id: row.quality_check_id ?? null,
+      evidence_geojson_url: row.quality_check_id
+        ? `/api/v1/projects/${projectId}/quality-checks/${row.quality_check_id}/evidence/geojson`
+        : null,
+      detection_count: row.detection_count ?? null,
+      precision: row.precision ?? null,
+      recall: row.recall ?? null,
+      f1_score: row.f1_score ?? null,
+      false_positives: row.false_positives ?? null,
+      false_negatives: row.false_negatives ?? null,
+      message: row.message ?? null,
+    })),
+  }
+}
+
+function downloadCalibrationSummary(projectId: string | null, rows: DetectionCalibrationRunRow[]): void {
+  if (!projectId || rows.length === 0) {
+    return
+  }
+  downloadJsonFile('detection-calibration-summary.json', buildCalibrationSummaryExport(projectId, rows))
+}
+
+function downloadJsonFile(filename: string, payload: unknown): void {
+  const blob = new Blob([JSON.stringify(payload, null, 2)], { type: 'application/json' })
+  const url = URL.createObjectURL(blob)
+  const link = document.createElement('a')
+  link.href = url
+  link.download = filename
+  link.click()
+  URL.revokeObjectURL(url)
+}
+
 function formatNullableNumber(value: number | null, digits: number): string {
   return typeof value === 'number' && Number.isFinite(value) ? value.toFixed(digits) : 'n/a'
 }
diff --git a/frontend/src/styles/app.css b/frontend/src/styles/app.css
index d439440e..e6c566a5 100644
--- a/frontend/src/styles/app.css
+++ b/frontend/src/styles/app.css
@@ -3315,6 +3315,14 @@ button.entity-card {
   white-space: nowrap;
 }
 
+.panel-action-row {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  justify-content: flex-end;
+  gap: 0.5rem;
+}
+
 .calibration-summary-grid {
   display: grid;
   grid-template-columns: repeat(3, minmax(0, 1fr));