release: 3.21.0

.github/workflows/ci.yml

@@ -21,10 +21,10 @@ jobs:
     runs-on: ${{ github.repository == 'stainless-sdks/stagehand-python' && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
     if: (github.event_name == 'push' || github.event.pull_request.head.repo.fork) && (github.event_name != 'push' || github.event.head_commit.message != 'codegen metadata')
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5.4.2
         with:
           version: '0.10.2'
 
@@ -43,10 +43,10 @@ jobs:
       id-token: write
     runs-on: ${{ github.repository == 'stainless-sdks/stagehand-python' && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5.4.2
         with:
           version: '0.10.2'
 
@@ -61,7 +61,7 @@ jobs:
           github.repository == 'stainless-sdks/stagehand-python' &&
           !startsWith(github.ref, 'refs/heads/stl/')
         id: github-oidc
-        uses: actions/github-script@v8
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
         with:
           script: core.setOutput('github_token', await core.getIDToken());
 
@@ -81,10 +81,10 @@ jobs:
     runs-on: ${{ github.repository == 'stainless-sdks/stagehand-python' && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
     if: github.event_name == 'push' || github.event.pull_request.head.repo.fork
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5.4.2
         with:
           version: '0.10.2'
 

.github/workflows/publish-pypi.yml

@@ -38,10 +38,10 @@ jobs:
       contents: read
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5.4.2
         with:
           version: "0.9.13"
 

.github/workflows/release-doctor.yml

@@ -12,7 +12,7 @@ jobs:
     if: github.repository == 'browserbase/stagehand-python' && (github.event_name == 'push' || github.event_name == 'workflow_dispatch' || startsWith(github.head_ref, 'release-please') || github.head_ref == 'next')
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Check release environment
         run: |

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "3.20.0"
+  ".": "3.21.0"
 }

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 8
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/browserbase/stagehand-6f6bfb81d092f30a5e2005328c97d61b9ea36132bb19e9e79e55294b9534ce20.yml
-openapi_spec_hash: f3fc1e3688a38dc2c28f7178f7d534e5
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/browserbase/stagehand-c7910965e66e73ad8b65b6cc391d431094b2a6c6577c3e9d82feaa8138e74cff.yml
+openapi_spec_hash: 37748bb69c22a9ce721d9b5a5861f964
 config_hash: 1fb12ae9b478488bc1e56bfbdc210b01

CHANGELOG.md

@@ -1,5 +1,22 @@
 # Changelog
 
+## 3.21.0 (2026-05-27)
+
+Full Changelog: [v3.20.0...v3.21.0](https://github.com/browserbase/stagehand-python/compare/v3.20.0...v3.21.0)
+
+### Features
+
+* [feat]: add `ignoreSelectors` to `observe()` ([77be2c2](https://github.com/browserbase/stagehand-python/commit/77be2c2463c7b1d0ce6768eecf130adc3ef91149))
+* [STG-1756] forward Vertex model config ([09bdd54](https://github.com/browserbase/stagehand-python/commit/09bdd5484e09c3827bed41e8fca5dbefd6d9ada9))
+* Add `screenshot` option to Extract ([393ebbe](https://github.com/browserbase/stagehand-python/commit/393ebbee487278360fc844e1fb5034651f37cce4))
+* **internal/types:** support eagerly validating pydantic iterators ([95a4cc8](https://github.com/browserbase/stagehand-python/commit/95a4cc8cd9228e21ea7eefa7138e498bf628e376))
+* STG-1756 add Vertex auth params to Stagehand spec ([2bdeae8](https://github.com/browserbase/stagehand-python/commit/2bdeae8adfe292c4bffc8ff93444f5be4c255c2e))
+
+
+### Bug Fixes
+
+* **client:** add missing f-string prefix in file type error message ([fb40f50](https://github.com/browserbase/stagehand-python/commit/fb40f50c2fb3337be84a3f973b8a27a8f53fbfae))
+
 ## 3.20.0 (2026-05-06)
 
 Full Changelog: [v3.19.5...v3.20.0](https://github.com/browserbase/stagehand-python/compare/v3.19.5...v3.20.0)

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "stagehand"
-version = "3.20.0"
+version = "3.21.0"
 description = "The official Python library for the stagehand API"
 dynamic = ["readme"]
 license = "MIT"

src/stagehand/_files.py

@@ -99,7 +99,7 @@ async def async_to_httpx_files(files: RequestFiles | None) -> HttpxRequestFiles
     elif is_sequence_t(files):
         files = [(key, await _async_transform_file(file)) for key, file in files]
     else:
-        raise TypeError("Unexpected file type input {type(files)}, expected mapping or sequence")
+        raise TypeError(f"Unexpected file type input {type(files)}, expected mapping or sequence")
 
     return files
 

src/stagehand/_models.py

@@ -25,7 +25,9 @@
     ClassVar,
     Protocol,
     Required,
+    Annotated,
     ParamSpec,
+    TypeAlias,
     TypedDict,
     TypeGuard,
     final,
@@ -79,7 +81,15 @@
 from ._constants import RAW_RESPONSE_HEADER
 
 if TYPE_CHECKING:
+    from pydantic import GetCoreSchemaHandler, ValidatorFunctionWrapHandler
+    from pydantic_core import CoreSchema, core_schema
     from pydantic_core.core_schema import ModelField, ModelSchema, LiteralSchema, ModelFieldsSchema
+else:
+    try:
+        from pydantic_core import CoreSchema, core_schema
+    except ImportError:
+        CoreSchema = None
+        core_schema = None
 
 __all__ = ["BaseModel", "GenericModel"]
 
@@ -396,6 +406,76 @@ def model_dump_json(
             )
 
 
+class _EagerIterable(list[_T], Generic[_T]):
+    """
+    Accepts any Iterable[T] input (including generators), consumes it
+    eagerly, and validates all items upfront.
+
+    Validation preserves the original container type where possible
+    (e.g. a set[T] stays a set[T]).  Serialization (model_dump / JSON)
+    always emits a list — round-tripping through model_dump() will not
+    restore the original container type.
+    """
+
+    @classmethod
+    def __get_pydantic_core_schema__(
+        cls,
+        source_type: Any,
+        handler: GetCoreSchemaHandler,
+    ) -> CoreSchema:
+        (item_type,) = get_args(source_type) or (Any,)
+        item_schema: CoreSchema = handler.generate_schema(item_type)
+        list_of_items_schema: CoreSchema = core_schema.list_schema(item_schema)
+
+        return core_schema.no_info_wrap_validator_function(
+            cls._validate,
+            list_of_items_schema,
+            serialization=core_schema.plain_serializer_function_ser_schema(
+                cls._serialize,
+                info_arg=False,
+            ),
+        )
+
+    @staticmethod
+    def _validate(v: Iterable[_T], handler: "ValidatorFunctionWrapHandler") -> Any:
+        original_type: type[Any] = type(v)
+
+        # Normalize to list so list_schema can validate each item
+        if isinstance(v, list):
+            items: list[_T] = v
+        else:
+            try:
+                items = list(v)
+            except TypeError as e:
+                raise TypeError("Value is not iterable") from e
+
+        # Validate items against the inner schema
+        validated: list[_T] = handler(items)
+
+        # Reconstruct original container type
+        if original_type is list:
+            return validated
+        # str(list) produces the list's repr, not a string built from items,
+        # so skip reconstruction for str and its subclasses.
+        if issubclass(original_type, str):
+            return validated
+        try:
+            return original_type(validated)
+        except (TypeError, ValueError):
+            # If the type cannot be reconstructed, just return the validated list
+            return validated
+
+    @staticmethod
+    def _serialize(v: Iterable[_T]) -> list[_T]:
+        """Always serialize as a list so Pydantic's JSON encoder is happy."""
+        if isinstance(v, list):
+            return v
+        return list(v)
+
+
+EagerIterable: TypeAlias = Annotated[Iterable[_T], _EagerIterable]
+
+
 def _construct_field(value: object, field: FieldInfo, key: str) -> object:
     if value is None:
         return field_get_default(field)

src/stagehand/_version.py

@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "stagehand"
-__version__ = "3.20.0"  # x-release-please-version
+__version__ = "3.21.0"  # x-release-please-version

src/stagehand/types/__init__.py

@@ -4,7 +4,6 @@
 
 from .action_param import ActionParam as ActionParam
 from .stream_event import StreamEvent as StreamEvent
-from .model_config_param import ModelConfigParam as ModelConfigParam
 from .session_act_params import SessionActParams as SessionActParams
 from .session_act_response import SessionActResponse as SessionActResponse
 from .session_end_response import SessionEndResponse as SessionEndResponse