diff --git a/docs/easycom_oracle_information.md b/docs/easycom_oracle_information.md
index 56aa072..00121a3 100644
--- a/docs/easycom_oracle_information.md
+++ b/docs/easycom_oracle_information.md
@@ -61,7 +61,9 @@ CUDA_VISIBLE_DEVICES=0 bash run_easycom_oracle_information.sh all 0
 
 `all` prepares the five oracle conditions, trains on Sessions 4--11, selects
 the checkpoint on Session 12, runs Session-12 inference and prints the standard
-dense AP/mAP screen. It deliberately does not run Sessions 1--3.
+dense AP/mAP screen. Existing compatible oracle sidecars are validated and
+reused, so interrupted preparation can resume. It deliberately does not run
+Sessions 1--3.
 
 If preparation reports any transcript/target mismatch, stop and inspect it.
 Do not raise `--max-label-mismatch-rows` merely to make the run continue.
diff --git a/prepare_easycom_oracle_features.py b/prepare_easycom_oracle_features.py
index 6e59099..a3eb293 100644
--- a/prepare_easycom_oracle_features.py
+++ b/prepare_easycom_oracle_features.py
@@ -325,6 +325,7 @@ def parse_args() -> argparse.Namespace:
     parser.add_argument("--shuffle-seed", type=int, default=2027)
     parser.add_argument("--max-label-mismatch-rows", type=int, default=0)
     parser.add_argument("--expected-mode", default="open-stream-replay")
+    parser.add_argument("--reuse-existing", action="store_true")
     parser.add_argument("--overwrite", action="store_true")
     parser.add_argument("--dry-run", action="store_true")
     return parser.parse_args()
@@ -437,9 +438,42 @@ def main() -> None:
 
         for condition in conditions:
             destination = args.output_root / condition / f"{session}.pt"
+            if destination.exists() and args.reuse_existing and not args.overwrite:
+                _, existing_people, existing_contract = load_frame_set_features(
+                    destination,
+                    reference,
+                    sample_id=session,
+                    dataset="easycom",
+                    oracle_analysis=True,
+                )
+                existing_config = existing_contract["config"]
+                expected_existing = {
+                    "oracle_condition": condition,
+                    "history_steps": history_steps,
+                    "delay_steps": delay_steps if condition == "delayed" else 0,
+                    "camera_wearer_id": args.camera_wearer_id,
+                    "audio_dim": audio_dim,
+                    "source_local_contract": source_contract,
+                }
+                mismatches = {
+                    key: (existing_config.get(key), value)
+                    for key, value in expected_existing.items()
+                    if existing_config.get(key) != value
+                }
+                if mismatches:
+                    raise ValueError(
+                        f"Cannot reuse incompatible oracle sidecar {destination}: "
+                        f"{mismatches}"
+                    )
+                print(
+                    f"  {condition}: reuse {destination}; "
+                    f"observations={len(existing_people.features)}"
+                )
+                continue
             if destination.exists() and not args.overwrite:
                 raise FileExistsError(
-                    f"Refusing to overwrite {destination}; pass --overwrite"
+                    f"Refusing to overwrite {destination}; pass --overwrite "
+                    "or --reuse-existing"
                 )
             condition_seed = (
                 args.shuffle_seed
diff --git a/run_easycom_oracle_information.sh b/run_easycom_oracle_information.sh
index 8746177..0a19aae 100755
--- a/run_easycom_oracle_information.sh
+++ b/run_easycom_oracle_information.sh
@@ -51,7 +51,8 @@ prepare_oracles() {
     --conditions "${oracle_conditions[@]}" \
     --history-seconds 2.0 \
     --delay-seconds 1.0 \
-    --expected-mode "${EXPECTED_MODE}"
+    --expected-mode "${EXPECTED_MODE}" \
+    --reuse-existing
 }
 
 variant_local_args() {