diff --git a/README.md b/README.md
index bc01209a752c658752bdef4cc070ddb2448802ed..862970ad832c6b1f5a9889a1f358189f806db96b 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ configs:
 
 # cua-lite/GUIOdyssey
 
-cua-lite preprocessed version of GUIOdyssey (hflqf88888/GUIOdyssey). A long-horizon cross-app Android mobile dataset of 8,334 task trajectories over ~128k screenshots. Produces two cohorts: navigation (multi-step agent episodes) and understanding (per-step screen captioning from the source `description` annotations).
+cua-lite preprocessed version of GUIOdyssey (hflqf88888/GUIOdyssey). A long-horizon cross-app Android mobile dataset of 8,334 task trajectories over ~128k screenshots. Produces two cohorts: use (multi-step agent episodes) and understanding (per-step screen captioning from the source `description` annotations).
 
 ## Origin
 
@@ -65,45 +65,114 @@ ds = load_dataset("cua-lite/GUIOdyssey")
 ds = load_dataset("cua-lite/GUIOdyssey", "mobile.understanding")
 ```
 
-You can also filter by `metadata.platform` / `metadata.task_type` /
-`metadata.others.*` after loading; every row carries a rich `metadata`
-struct (see schema below).
+After loading, parse `metadata` as JSON before filtering by `metadata_kind`,
+`dims`, or `others.*`; every row carries a rich metadata object inside that JSON
+string (see schema below). CUA rows use `dims == [platform, task_type]`.
 
 ## Schema
 
-Each row has these columns:
+Published parquet columns:
 
 | column | type | notes |
 |---|---|---|
 | `images` | list[Image] | embedded PNG/JPEG bytes; HF viewer renders thumbnails |
-| `messages` | list[struct] | OpenAI-style turns with `role` + structured `content` |
-| `metadata` | struct | `{platform, task_type, extra_tool_schemas, valid_actions, others{...}}` |
+| `messages` | string (JSON array) | parse as JSON to OpenAI-style turns with `role`, structured `content`, nested `tool_calls`, and `role:"tool"` results |
+| `metadata` | string (JSON object) | parse as JSON to fields `metadata_kind`, `dims`, `extra_tool_schemas`, CUA-only `valid_actions`, and `others` |
+| `_folded` | string (JSON array, optional) | folded grounding/understanding rows only; authoritative per-instruction `messages` / `metadata` members |
 
 Coordinate values in `messages` are normalized to `[0, 1000]` integers.
+The JSON examples below show the decoded shape, not the raw string cell.
+
+`metadata.extra_tool_schemas[*]` uses the nested Chat Completions function-tool
+declaration shape:
+
+```json
+{
+  "metadata_kind": "cua",
+  "dims": ["desktop", "use"],
+  "extra_tool_schemas": [
+    {
+      "type": "function",
+      "function": {
+        "name": "bash",
+        "description": "Run a shell command.",
+        "parameters": {
+          "type": "object",
+          "properties": {"cmd": {"type": "string"}},
+          "required": ["cmd"]
+        }
+      }
+    }
+  ],
+  "valid_actions": ["click", "type"],
+  "others": {}
+}
+```
+
+`messages[].tool_calls[*]` uses the matching nested invocation shape. Tool
+results pair `tool_calls[].id` with `role:"tool"` `tool_call_id`:
+
+```json
+[
+  {
+    "role": "user",
+    "content": [
+      {"type": "image", "index": 0},
+      {"type": "text", "text": "Click the OK button."}
+    ]
+  },
+  {
+    "role": "assistant",
+    "tool_calls": [
+      {
+        "id": "call_0000",
+        "type": "function",
+        "function": {
+          "name": "computer",
+          "arguments": {
+            "actions": [
+              {"action": "click", "coordinate": [640, 400]},
+              {"action": "type", "text": "hello"}
+            ]
+          }
+        }
+      }
+    ]
+  },
+  {
+    "role": "tool",
+    "tool_call_id": "call_0000",
+    "content": [
+      {"type": "image", "index": 1},
+      {"type": "text", "text": "clicked; typed"}
+    ]
+  }
+]
+```
 
 **Image-dedup (`grounding.*` / `understanding` cohorts).** These cohorts are
 single-image-per-row and many rows share the same screenshot, so to avoid
 re-embedding identical image bytes once per instruction they are stored
 *folded*: one row per unique screenshot (image embedded once), carrying an
 extra **`_folded`** column — a JSON string with the authoritative list of
-`{messages, metadata}` members for that screenshot. The row's top-level
-`messages` is the members concatenated for viewer convenience. `use`
-cohorts are not folded. **Use `lite.data.hf.download` to consume this repo** —
-it unfolds automatically back to one row per instruction; reading the parquet
-directly yields the folded form.
+per-instruction members for that screenshot. Each member's `messages` and
+`metadata` values are the same opaque JSON strings described above. The row's
+top-level `messages` is a JSON string containing the members concatenated for
+viewer convenience. `use` cohorts are not folded. **Use
+`lite.data.hf.download` to consume this repo** — it unfolds automatically back
+to one row per instruction; reading the parquet directly yields the folded form.
 
 ## Layout
 
 ```
-<platform>/<task_type>/<split>/shard-NNNNN-of-NNNNN.parquet                  # single-variant cohort
-<platform>/<task_type>/<split>/<variant>/shard-NNNNN-of-NNNNN.parquet        # multi-variant cohort
+<platform>/<task_type>/<split>/<variant>/shard-NNNNN-of-NNNNN.parquet
 ```
 
-- `platform` ∈ {desktop, mobile, web}
+- `platform` ∈ {desktop, browser, mobile}
 - `task_type` ∈ {understanding, grounding.action, grounding.point, grounding.bbox, use} — used verbatim as the dir component
-- HF config names are `<platform>.<task_type>` (e.g. `mobile.grounding.action`). The agent registry lookup key in code is `<agent>@<platform>@<task_type>` (e.g. `qwen3_vl@mobile@grounding.action`); only this user-facing token uses `.` between platform and task_type, because `@` triggers a 403 on the dataset-viewer's signed image URLs.
+- HF config names are `<platform>.<task_type>` by default (e.g. `mobile.grounding.action`) — UNLESS the dataset was staged with `--config-names`, which sets verbatim, explicitly-chosen config names (see the `configs:` block above for the authoritative list). The agent registry lookup key in code is `<agent>@<platform>@<task_type>` (e.g. `qwen3_vl@mobile@grounding.action`); only this user-facing token uses `.` between platform and task_type, because `@` triggers a 403 on the dataset-viewer's signed image URLs.
 - HF split names stay `train` / `validation` (the `datasets` library blacklists `<>:/\|?*` in split names; everything else is fine in config_name)
-- `validation` is an in-distribution held-out slice (never used in training); `test` is reserved for out-of-distribution benchmark datasets
+- `validation` is an in-distribution held-out slice: no validation **sample** also appears in `train` — content-identical rows (same `images` + same `messages`, differing only in their ids) are co-located into one split, so upstream re-publishing one sample under two ids cannot straddle the split. It is *not* disjoint in **images**: one screenshot legitimately backs many distinct samples, and only whole samples are co-located, so the same picture can appear on both sides. `test` is reserved for out-of-distribution benchmark datasets
 
 ## Stats
 
@@ -135,6 +204,8 @@ form directly with `--image-root=$CUA_LITE_DATASETS_ROOT`.
 
 Source `info` coordinates are already normalized to [0, 1000] (per the upstream README) and are used directly — they are NOT device pixels.
 
+split: content-identical rows co-located, then hash_split on metadata.others.id with val_frac=0.02, seed=42, val_cap=2000 per (metadata.dims[0], metadata.dims[1], variant) (an upstream split label, where the source ships one, wins over the hash). A cap-bound carve depends on source iteration order and these parameters do not reproduce it; content co-location may make the final physical validation row count differ from the cap.
+
 ## License & citation
 
 See original dataset (hflqf88888/GUIOdyssey).
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