diff --git a/CHANGELOG.md b/CHANGELOG.md
index b98f81b..a82376d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,28 @@ All notable changes to `chemflow-client` will be documented in this file.
 
 ## Unreleased
 
+## 0.1.5
+
+- Changed `chat3d(...)` to require `prompt` as a keyword argument and make `atoms` optional, so generation calls can use `chat3d(prompt="generate methane")`.
+- Simplified the README examples for `chat3d(...)` and documented the public call signatures in a dedicated section.
+
+## 0.1.4
+
+- Fixed the README notebook widget image for PyPI by switching from a GitHub `blob` page URL to the raw GIF URL pinned to the release tag.
+
+## 0.1.3
+
+- Updated the README notebook widget image to use the GitHub-hosted URL so the animation renders correctly on PyPI.
+- Simplified the notebook widget assistant placeholder text from `Thinking harder...` to `Thinking...`.
+
+## 0.1.2
+
+- Published the client and widget improvements that were previously tagged but not released to PyPI because of a package-version mismatch.
+- Improved `ChemFlow3DClient` request preparation and response application so notebook background chats can reuse the same state transitions safely.
+- Improved `Chat3DWidget` background chat handling to stay responsive and avoid applying results after the widget is closed.
+- Improved ASE payload conversion for generated or empty structures so optional arrays, cell data, and periodic boundary flags are preserved more consistently.
+- Expanded the public README examples for structure generation workflows and notebook usage.
+
 ## 0.1.0
 
 - Initial public release.
diff --git a/README.md b/README.md
index b57343a..ed83d01 100644
--- a/README.md
+++ b/README.md
@@ -32,14 +32,11 @@ from chemflow_client import chat3d
 
 atoms = molecule("H2O")
 updated_atoms, text = chat3d(
-    atoms,
-    "change the H-O-H angle to 110 degrees",
-)
-
-generated_atoms, text = chat3d(
-    atoms=None,
-    prompt="generate methane",
+    prompt="change the H-O-H angle to 110 degrees",
+    atoms=atoms,
 )
+# or generate one directly.
+generated_atoms, text = chat3d(prompt="generate methane")
 ```
 
 ## JupyterLab
@@ -57,7 +54,7 @@ widget
 widget.get_atoms()
 ```
 
-![JupyterLab widget demo](docs/assets/chemflow-widget-demo.gif)
+![JupyterLab widget demo](https://raw.githubusercontent.com/SingletC/chemflow-client/v0.1.5/docs/assets/chemflow-widget-demo.gif)
 
 
 ## Configure
@@ -76,10 +73,47 @@ You can also pass configuration as arguments to `chat3d(...)` or `Chat3DWidget(.
 from chemflow_client import Chat3DWidget, chat3d
 
 updated_atoms, text = chat3d(
-    atoms=None,
     prompt="generate methane",
     api_key="cfsk_xxx",
 )
 
 widget = Chat3DWidget(api_key="cfsk_xxx")
 ```
+
+## Call Signatures
+
+### `chat3d(...)`
+
+```python
+chat3d(
+    *,
+    prompt: str,
+    atoms: Optional[Atoms] = None,
+    base_url: Optional[str] = None,
+    api_key: Optional[str] = None,
+    model: Optional[str] = None,
+    timeout: float = 300.0,
+) -> Tuple[Atoms, str]
+```
+
+- `prompt`: Required keyword-only editing or generation instruction.
+- `atoms`: Optional initial `ase.Atoms` structure.
+- `base_url`, `api_key`, `model`, `timeout`: Optional client configuration overrides.
+- Returns `(atoms, text)`.
+
+### `Chat3DWidget(...)`
+
+```python
+Chat3DWidget(
+    atoms: Optional[Atoms] = None,
+    *,
+    base_url: Optional[str] = None,
+    api_key: Optional[str] = None,
+    model: Optional[str] = None,
+    timeout: float = 300.0,
+)
+```
+
+- `atoms`: Optional initial `ase.Atoms` structure.
+- `base_url`, `api_key`, `model`, `timeout`: Optional client configuration overrides.
+- Returns a notebook widget instance backed by `ChemFlow3DClient`.
diff --git a/pyproject.toml b/pyproject.toml
index 689b081..1776eab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "chemflow-client"
-version = "0.1.0"
+version = "0.1.5"
 description = "Public Python client for ChemFlow 3D chat editing"
 readme = "README.md"
 requires-python = ">=3.9"
diff --git a/src/chemflow_client/api.py b/src/chemflow_client/api.py
index 8647c7a..3a57352 100644
--- a/src/chemflow_client/api.py
+++ b/src/chemflow_client/api.py
@@ -30,7 +30,7 @@ def __init__(
             transport=transport,
             headers={
                 "X-ChemFlow-Api-Key": resolved_api_key,
-                "User-Agent": "chemflow-client/0.1.0",
+                "User-Agent": "chemflow-client/0.1.5",
                 "Accept": "application/json",
             },
         )
diff --git a/src/chemflow_client/client.py b/src/chemflow_client/client.py
index b7f0c6f..4d7c03d 100644
--- a/src/chemflow_client/client.py
+++ b/src/chemflow_client/client.py
@@ -122,9 +122,9 @@ def __exit__(self, exc_type, exc, tb) -> None:
 
 
 def chat3d(
-    atoms: Optional[Atoms],
-    prompt: str,
     *,
+    prompt: str,
+    atoms: Optional[Atoms] = None,
     base_url: Optional[str] = None,
     api_key: Optional[str] = None,
     model: Optional[str] = None,
diff --git a/src/chemflow_client/widget.py b/src/chemflow_client/widget.py
index c304ebe..ccef2ec 100644
--- a/src/chemflow_client/widget.py
+++ b/src/chemflow_client/widget.py
@@ -64,7 +64,7 @@ def _format_widget_error_message(error: Union[Exception, str]) -> str:
 
 _WIDGET_ESM = r'''
 const THREE_DMOL_URL = "https://cdn.jsdelivr.net/npm/3dmol@2.4.2/build/3Dmol-min.js";
-const THINKING_PLACEHOLDER = "Thinking harder...";
+const THINKING_PLACEHOLDER = "Thinking...";
 
 async function ensure3Dmol() {
   if (window.$3Dmol) {
diff --git a/tests/test_client.py b/tests/test_client.py
index 858866e..646754f 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -35,8 +35,8 @@ def fake_chat3d(self, request):
 
     atoms = Atoms(symbols=["H", "H"], positions=[[0.0, 0.0, 0.0], [0.0, 0.0, 0.74]])
     updated_atoms, text = chat3d(
-        atoms,
-        "stretch the bond",
+        prompt="stretch the bond",
+        atoms=atoms,
         base_url="http://localhost:8000",
         api_key="cfsk_test_key",
     )
@@ -68,8 +68,7 @@ def fake_chat3d(self, request):
     monkeypatch.setattr("chemflow_client.api.ChemFlowApi.chat3d", fake_chat3d)
 
     updated_atoms, text = chat3d(
-        None,
-        "generate methane",
+        prompt="generate methane",
         api_key="cfsk_test_key",
     )
 
@@ -217,8 +216,8 @@ def fake_chat3d(self, request):
     monkeypatch.setattr("chemflow_client.api.ChemFlowApi.chat3d", fake_chat3d)
 
     atoms, text = chat3d(
-        Atoms(symbols=["He"], positions=[[0.0, 0.0, 0.0]]),
-        "leave it as is",
+        prompt="leave it as is",
+        atoms=Atoms(symbols=["He"], positions=[[0.0, 0.0, 0.0]]),
     )
 
     assert atoms.get_chemical_symbols() == ["He"]
diff --git a/tests/test_widget_helpers.py b/tests/test_widget_helpers.py
index f8670bd..9082add 100644
--- a/tests/test_widget_helpers.py
+++ b/tests/test_widget_helpers.py
@@ -42,7 +42,7 @@ def test_format_widget_error_message_prefers_structured_message():
 
 
 def test_widget_esm_uses_chat_thinking_placeholder_instead_of_waiting_banner():
-    assert "Thinking harder..." in _WIDGET_ESM
+    assert "Thinking..." in _WIDGET_ESM
     assert "Waiting for ChemFlow response:" not in _WIDGET_ESM