release: 1.11.0

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ${{ github.repository == 'stainless-sdks/letta-sdk-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 Rye
         run: |
@@ -46,7 +46,7 @@ jobs:
       id-token: write
     runs-on: ${{ github.repository == 'stainless-sdks/letta-sdk-python' && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install Rye
         run: |
@@ -67,7 +67,7 @@ jobs:
           github.repository == 'stainless-sdks/letta-sdk-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());
 
@@ -87,7 +87,7 @@ jobs:
     runs-on: ${{ github.repository == 'stainless-sdks/letta-sdk-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 Rye
         run: |

.github/workflows/publish-pypi.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Install Rye
         run: |

.github/workflows/release-doctor.yml

@@ -12,7 +12,7 @@ jobs:
     if: github.repository == 'letta-ai/letta-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 @@
 {
-  ".": "1.10.3"
+  ".": "1.11.0"
 }

.stats.yml

@@ -1,4 +1,4 @@
 configured_endpoints: 126
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/letta-ai%2Fletta-sdk-873f657578988b58f8920addcacee62440377571f56a48c44b3505342a4cdc96.yml
-openapi_spec_hash: 6c5174fa1eddd3c0b8b072320d1d32b0
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/letta-ai/letta-sdk-3bf3ab3365d6881961c545ff1cde437e4060d17a0d46d02116f3be0b79158f5d.yml
+openapi_spec_hash: 6c229aac939ec0b917ed2dcd5547deeb
 config_hash: f2ff70633d052a11601ad82a5afcfaec

CHANGELOG.md

@@ -1,5 +1,39 @@
 # Changelog
 
+## 1.11.0 (2026-05-14)
+
+Full Changelog: [v1.10.3...v1.11.0](https://github.com/letta-ai/letta-python/compare/v1.10.3...v1.11.0)
+
+### Features
+
+* cap v1 limit query params ([b5edad1](https://github.com/letta-ai/letta-python/commit/b5edad120811911e5f095dd280ba98c0da956acb))
+* **core:** add moonshot and kimi code BYOK providers ([0b0940b](https://github.com/letta-ai/letta-python/commit/0b0940b2ae070319c6a0f2cc4114a4d2b09d2b5a))
+* **internal/types:** support eagerly validating pydantic iterators ([8d289a9](https://github.com/letta-ai/letta-python/commit/8d289a9daa714a4f54d4d0483df35c5236b46797))
+* support setting headers via env ([f0c2ba8](https://github.com/letta-ai/letta-python/commit/f0c2ba89ef56ee33ff8137eee8c3a78c3b3ec689))
+
+
+### Bug Fixes
+
+* **client:** add missing f-string prefix in file type error message ([cbf36eb](https://github.com/letta-ai/letta-python/commit/cbf36ebe5738e46ecdd278db55d8dba1fd8fa373))
+* use correct field name format for multipart file arrays ([1039e5a](https://github.com/letta-ai/letta-python/commit/1039e5a7bb425f445ec815d15fcead06e2801a36))
+
+
+### Performance Improvements
+
+* **core:** reduce conversation send hot-path reads ([8a7b06e](https://github.com/letta-ai/letta-python/commit/8a7b06eee9b4d0ad28fe1016de5237797dfb01eb))
+
+
+### Chores
+
+* **internal:** more robust bootstrap script ([074fe85](https://github.com/letta-ai/letta-python/commit/074fe8585483c25a8c2cee48e3324db034901b47))
+* **internal:** reformat pyproject.toml ([d9a6109](https://github.com/letta-ai/letta-python/commit/d9a6109c3a68c5ad4bb2980ea5b53e3fc7a0e96b))
+
+
+### Refactors
+
+* hard-deprecate isolated conversation blocks ([ed0a3d4](https://github.com/letta-ai/letta-python/commit/ed0a3d42fcbc0b9b4af4a3fe63e2dff5bb0161f0))
+* stop creating new isolated conversation blocks ([aa75f2a](https://github.com/letta-ai/letta-python/commit/aa75f2af909e91d5a30e81ec2ac6cde27193a074))
+
 ## 1.10.3 (2026-04-17)
 
 Full Changelog: [v1.10.2...v1.10.3](https://github.com/letta-ai/letta-python/compare/v1.10.2...v1.10.3)

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "letta-client"
-version = "1.10.3"
+version = "1.11.0"
 description = "The official Python library for the letta API"
 dynamic = ["readme"]
 license = "Apache-2.0"
@@ -168,7 +168,7 @@ show_error_codes = true
 #
 # We also exclude our `tests` as mypy doesn't always infer
 # types correctly and Pyright will still catch any type errors.
-exclude = ['src/letta_client/_files.py', '_dev/.*.py', 'tests/.*']
+exclude = ["src/letta_client/_files.py", "_dev/.*.py", "tests/.*"]
 
 strict_equality = true
 implicit_reexport = true

scripts/bootstrap

@@ -4,7 +4,7 @@ set -e
 
 cd "$(dirname "$0")/.."
 
-if [ -f "Brewfile" ] && [ "$(uname -s)" = "Darwin" ] && [ "$SKIP_BREW" != "1" ] && [ -t 0 ]; then
+if [ -f "Brewfile" ] && [ "$(uname -s)" = "Darwin" ] && [ "${SKIP_BREW:-}" != "1" ] && [ -t 0 ]; then
   brew bundle check >/dev/null 2>&1 || {
     echo -n "==> Install Homebrew dependencies? (y/N): "
     read -r response

src/letta_client/_client.py

@@ -22,7 +22,11 @@
     RequestOptions,
     not_given,
 )
-from ._utils import is_given, get_async_library
+from ._utils import (
+    is_given,
+    is_mapping_t,
+    get_async_library,
+)
 from ._compat import cached_property
 from ._version import __version__
 from ._response import (
@@ -165,6 +169,15 @@ def __init__(
             except KeyError as exc:
                 raise ValueError(f"Unknown environment: {environment}") from exc
 
+        custom_headers_env = os.environ.get("LETTA_CUSTOM_HEADERS")
+        if custom_headers_env is not None:
+            parsed: dict[str, str] = {}
+            for line in custom_headers_env.split("\n"):
+                colon = line.find(":")
+                if colon >= 0:
+                    parsed[line[:colon].strip()] = line[colon + 1 :].strip()
+            default_headers = {**parsed, **(default_headers if is_mapping_t(default_headers) else {})}
+
         super().__init__(
             version=__version__,
             base_url=base_url,
@@ -482,6 +495,15 @@ def __init__(
             except KeyError as exc:
                 raise ValueError(f"Unknown environment: {environment}") from exc
 
+        custom_headers_env = os.environ.get("LETTA_CUSTOM_HEADERS")
+        if custom_headers_env is not None:
+            parsed: dict[str, str] = {}
+            for line in custom_headers_env.split("\n"):
+                colon = line.find(":")
+                if colon >= 0:
+                    parsed[line[:colon].strip()] = line[colon + 1 :].strip()
+            default_headers = {**parsed, **(default_headers if is_mapping_t(default_headers) else {})}
+
         super().__init__(
             version=__version__,
             base_url=base_url,

src/letta_client/_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/letta_client/_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/letta_client/_qs.py

@@ -2,17 +2,13 @@
 
 from typing import Any, List, Tuple, Union, Mapping, TypeVar
 from urllib.parse import parse_qs, urlencode
-from typing_extensions import Literal, get_args
+from typing_extensions import get_args
 
-from ._types import NotGiven, not_given
+from ._types import NotGiven, ArrayFormat, NestedFormat, not_given
 from ._utils import flatten
 
 _T = TypeVar("_T")
 
-
-ArrayFormat = Literal["comma", "repeat", "indices", "brackets"]
-NestedFormat = Literal["dots", "brackets"]
-
 PrimitiveData = Union[str, int, float, bool, None]
 # this should be Data = Union[PrimitiveData, "List[Data]", "Tuple[Data]", "Mapping[str, Data]"]
 # https://github.com/microsoft/pyright/issues/3555

src/letta_client/_types.py

@@ -47,6 +47,9 @@
 ModelT = TypeVar("ModelT", bound=pydantic.BaseModel)
 _T = TypeVar("_T")
 
+ArrayFormat = Literal["comma", "repeat", "indices", "brackets"]
+NestedFormat = Literal["dots", "brackets"]
+
 
 # Approximates httpx internal ProxiesTypes and RequestFiles types
 # while adding support for `PathLike` instances