listen up

2026-08-28 10:49:56 +02:00 · 2025-12-17 23:06:05 +09:00
10 changed files with 487 additions and 231 deletions
@@ -1 +1 @@
-__version__ = "0.4.11"
+__version__ = "0.4.10"
@@ -19,7 +19,7 @@ dependencies = [
 path = "langgraph_cli/__init__.py"
 [project.optional-dependencies]
 inmem = [
-    "langgraph-api>=0.5.35,<0.7.0 ; python_version >= '3.11'",
+    "langgraph-api>=0.5.35,<0.6.0 ; python_version >= '3.11'",
    "langgraph-runtime-inmem>=0.7 ; python_version >= '3.11'",
    "python-dotenv>=0.8.0",
 ]
@@ -385,67 +385,49 @@ wheels = [

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 ]

 [[package]]
@@ -654,6 +654,8 @@ class Pregel(
        name: str = "LangGraph",
        **deprecated_kwargs: Unpack[DeprecatedKwargs],
    ) -> None:
+        root_listeners = deprecated_kwargs.pop("_root_listeners", None)
+        aroot_listeners = deprecated_kwargs.pop("_aroot_listeners", None)
        if (
            config_type := deprecated_kwargs.get("config_type", MISSING)
        ) is not MISSING:
@@ -698,6 +700,14 @@ class Pregel(
        self.config = config
        self.trigger_to_nodes = trigger_to_nodes or {}
        self.name = name
+        self._root_listeners = cast(
+            "tuple[Callable[[Any], Any] | None, Callable[[Any], Any] | None, Callable[[Any], Any] | None] | None",
+            root_listeners,
+        )
+        self._aroot_listeners = cast(
+            "tuple[Callable[[Any], Awaitable[Any]] | None, Callable[[Any], Awaitable[Any]] | None, Callable[[Any], Awaitable[Any]] | None] | None",
+            aroot_listeners,
+        )
        if auto_validate:
            self.validate()

@@ -789,6 +799,26 @@ class Pregel(
            {"config": merge_configs(self.config, config, cast(RunnableConfig, kwargs))}
        )

+    def with_listeners(
+        self,
+        *,
+        on_start: Callable[[Any], Any] | None = None,
+        on_end: Callable[[Any], Any] | None = None,
+        on_error: Callable[[Any], Any] | None = None,
+    ) -> Self:
+        """Create a copy of the Pregel object with updated sync listeners."""
+        return self.copy({"_root_listeners": (on_start, on_end, on_error)})
+
+    def with_alisteners(
+        self,
+        *,
+        on_start: Callable[[Any], Awaitable[Any]] | None = None,
+        on_end: Callable[[Any], Awaitable[Any]] | None = None,
+        on_error: Callable[[Any], Awaitable[Any]] | None = None,
+    ) -> Self:
+        """Create a copy of the Pregel object with updated async listeners."""
+        return self.copy({"_aroot_listeners": (on_start, on_end, on_error)})
+
    def validate(self) -> Self:
        validate_graph(
            self.nodes,
@@ -2497,6 +2527,26 @@ class Pregel(
        stream = SyncQueue()

        config = ensure_config(self.config, config)
+        if self._root_listeners is not None:
+            on_start, on_end, on_error = self._root_listeners
+            from langchain_core.tracers.root_listeners import RootListenersTracer
+
+            tracer = RootListenersTracer(
+                config=config,
+                on_start=on_start,
+                on_end=on_end,
+                on_error=on_error,
+            )
+            existing_callbacks = config.get("callbacks")
+            config = config.copy()
+            if existing_callbacks is None:
+                config["callbacks"] = [tracer]
+            elif isinstance(existing_callbacks, list):
+                config["callbacks"] = [*existing_callbacks, tracer]
+            else:
+                callbacks_manager = existing_callbacks.copy()
+                callbacks_manager.add_handler(tracer, inherit=True)
+                config["callbacks"] = callbacks_manager
        callback_manager = get_callback_manager_for_config(config)
        run_manager = callback_manager.on_chain_start(
            None,
@@ -2776,6 +2826,46 @@ class Pregel(
        )

        config = ensure_config(self.config, config)
+        if self._root_listeners is not None:
+            on_start, on_end, on_error = self._root_listeners
+            from langchain_core.tracers.root_listeners import RootListenersTracer
+
+            sync_tracer = RootListenersTracer(
+                config=config,
+                on_start=on_start,
+                on_end=on_end,
+                on_error=on_error,
+            )
+            existing_callbacks = config.get("callbacks")
+            config = config.copy()
+            if existing_callbacks is None:
+                config["callbacks"] = [sync_tracer]
+            elif isinstance(existing_callbacks, list):
+                config["callbacks"] = [*existing_callbacks, sync_tracer]
+            else:
+                callbacks_manager = existing_callbacks.copy()
+                callbacks_manager.add_handler(sync_tracer, inherit=True)
+                config["callbacks"] = callbacks_manager
+        if self._aroot_listeners is not None:
+            on_start, on_end, on_error = self._aroot_listeners
+            from langchain_core.tracers.root_listeners import AsyncRootListenersTracer
+
+            async_tracer = AsyncRootListenersTracer(
+                config=config,
+                on_start=on_start,
+                on_end=on_end,
+                on_error=on_error,
+            )
+            existing_callbacks = config.get("callbacks")
+            config = config.copy()
+            if existing_callbacks is None:
+                config["callbacks"] = [async_tracer]
+            elif isinstance(existing_callbacks, list):
+                config["callbacks"] = [*existing_callbacks, async_tracer]
+            else:
+                callbacks_manager = existing_callbacks.copy()
+                callbacks_manager.add_handler(async_tracer, inherit=True)
+                config["callbacks"] = callbacks_manager
        callback_manager = get_async_callback_manager_for_config(config)
        run_manager = await callback_manager.on_chain_start(
            None,
@@ -1,7 +1,7 @@
 from __future__ import annotations

 from abc import abstractmethod
-from collections.abc import AsyncIterator, Callable, Iterator, Sequence
+from collections.abc import AsyncIterator, Awaitable, Callable, Iterator, Sequence
 from typing import Any, Generic, cast

 from langchain_core.runnables import Runnable, RunnableConfig
@@ -20,6 +20,24 @@ class PregelProtocol(Runnable[InputT, Any], Generic[StateT, ContextT, InputT, Ou
        self, config: RunnableConfig | None = None, **kwargs: Any
    ) -> Self: ...

+    @abstractmethod
+    def with_listeners(
+        self,
+        *,
+        on_start: Callable[[Any], Any] | None = None,
+        on_end: Callable[[Any], Any] | None = None,
+        on_error: Callable[[Any], Any] | None = None,
+    ) -> Self: ...
+
+    @abstractmethod
+    def with_alisteners(
+        self,
+        *,
+        on_start: Callable[[Any], Awaitable[Any]] | None = None,
+        on_end: Callable[[Any], Awaitable[Any]] | None = None,
+        on_error: Callable[[Any], Awaitable[Any]] | None = None,
+    ) -> Self: ...
+
    @abstractmethod
    def get_graph(
        self,
@@ -252,6 +252,64 @@ def test_context_json_schema() -> None:
    }


+def test_pregel_with_listeners() -> None:
+    chain = NodeBuilder().subscribe_only("input").do(lambda x: x + 1).write_to("output")
+
+    app = Pregel(
+        nodes={"one": chain},
+        channels={
+            "input": LastValue(int),
+            "output": LastValue(int),
+        },
+        input_channels="input",
+        output_channels="output",
+    )
+
+    events: list[tuple[str, list[str] | None]] = []
+
+    def on_start(_: Any, config: RunnableConfig) -> None:
+        events.append(("start", list(config.get("tags") or [])))
+
+    def on_end(_: Any, config: RunnableConfig) -> None:
+        events.append(("end", list(config.get("tags") or [])))
+
+    out = app.with_listeners(on_start=on_start, on_end=on_end).invoke(
+        1, {"tags": ["tag-a"]}
+    )
+
+    assert out == 2
+    assert events == [("start", ["tag-a"]), ("end", ["tag-a"])]
+
+
+async def test_pregel_with_alisteners() -> None:
+    chain = NodeBuilder().subscribe_only("input").do(lambda x: x + 1).write_to("output")
+
+    app = Pregel(
+        nodes={"one": chain},
+        channels={
+            "input": LastValue(int),
+            "output": LastValue(int),
+        },
+        input_channels="input",
+        output_channels="output",
+    )
+
+    events: list[tuple[str, list[str] | None]] = []
+
+    async def on_start(_: Any, config: RunnableConfig) -> None:
+        events.append(("start", list(config.get("tags") or [])))
+
+    async def on_end(_: Any, config: RunnableConfig) -> None:
+        events.append(("end", list(config.get("tags") or [])))
+
+    out = await app.with_alisteners(on_start=on_start, on_end=on_end).ainvoke(
+        1, {"tags": ["tag-a"]}
+    )
+
+    assert out == 2
+    assert events == [("start", ["tag-a"]), ("end", ["tag-a"])]
+
+
 def test_node_schemas_custom_output() -> None:
    class State(TypedDict):
        hello: str
@@ -1678,7 +1678,7 @@ inmem = [
 [package.metadata]
 requires-dist = [
    { name = "click", specifier = ">=8.1.7" },
-    { name = "langgraph-api", marker = "python_full_version >= '3.11' and extra == 'inmem'", specifier = ">=0.5.35,<0.7.0" },
+    { name = "langgraph-api", marker = "python_full_version >= '3.11' and extra == 'inmem'", specifier = ">=0.5.35,<0.6.0" },
    { name = "langgraph-runtime-inmem", marker = "python_full_version >= '3.11' and extra == 'inmem'", specifier = ">=0.7" },
    { name = "langgraph-sdk", marker = "python_full_version >= '3.11'", specifier = ">=0.1.0" },
    { name = "python-dotenv", marker = "extra == 'inmem'", specifier = ">=0.8.0" },
@@ -3,6 +3,6 @@ from langgraph_sdk.client import get_client, get_sync_client
 from langgraph_sdk.encryption import Encryption
 from langgraph_sdk.encryption.types import EncryptionContext

-__version__ = "0.3.1"
+__version__ = "0.3.0"

 __all__ = ["Auth", "Encryption", "EncryptionContext", "get_client", "get_sync_client"]
@@ -64,6 +64,114 @@ def _validate_handler(fn: typing.Callable, handler_type: str) -> None:
        )


+class _JsonEncryptDecorators:
+    """Dynamic decorator factory for JSON encryption handlers.
+
+    Supports both default and model-specific handlers:
+    - @encrypt.json - default handler for all models
+    - @encrypt.json.thread - handler for thread model
+    """
+
+    def __init__(self, parent: Encryption):
+        self._parent = parent
+
+    def __call__(self, fn: types.JsonEncryptor) -> types.JsonEncryptor:
+        """Register the default JSON encryption handler.
+
+        Args:
+            fn: The handler function
+
+        Returns:
+            The registered handler function
+
+        Raises:
+            DuplicateHandlerError: If handler already registered
+            TypeError: If handler has invalid signature
+        """
+        if self._parent._json_encryptor is not None:
+            raise DuplicateHandlerError("Default JSON encryptor already registered")
+        _validate_handler(fn, "Default JSON encryptor")
+        self._parent._json_encryptor = fn
+        return fn
+
+    def __getattr__(
+        self, model: str
+    ) -> typing.Callable[[types.JsonEncryptor], types.JsonEncryptor]:
+        """Dynamic attribute access for model-specific handlers.
+
+        Allows @encryption.encrypt.json.thread, @encryption.encrypt.json.assistant, etc.
+
+        Raises:
+            DuplicateHandlerError: If handler already registered for this model
+            TypeError: If handler has invalid signature
+        """
+
+        def decorator(fn: types.JsonEncryptor) -> types.JsonEncryptor:
+            if model in self._parent._json_encryptors:
+                raise DuplicateHandlerError(
+                    f"JSON encryptor for model '{model}' already registered"
+                )
+            _validate_handler(fn, f"JSON encryptor for model '{model}'")
+            self._parent._json_encryptors[model] = fn
+            return fn
+
+        return decorator
+
+
+class _JsonDecryptDecorators:
+    """Dynamic decorator factory for JSON decryption handlers.
+
+    Supports both default and model-specific handlers:
+    - @encryption.decrypt.json - default handler for all models
+    - @encryption.decrypt.json.thread - handler for thread model
+    """
+
+    def __init__(self, parent: Encryption):
+        self._parent = parent
+
+    def __call__(self, fn: types.JsonDecryptor) -> types.JsonDecryptor:
+        """Register the default JSON decryption handler.
+
+        Args:
+            fn: The handler function
+
+        Returns:
+            The registered handler function
+
+        Raises:
+            DuplicateHandlerError: If handler already registered
+            TypeError: If handler has invalid signature
+        """
+        if self._parent._json_decryptor is not None:
+            raise DuplicateHandlerError("Default JSON decryptor already registered")
+        _validate_handler(fn, "Default JSON decryptor")
+        self._parent._json_decryptor = fn
+        return fn
+
+    def __getattr__(
+        self, model: str
+    ) -> typing.Callable[[types.JsonDecryptor], types.JsonDecryptor]:
+        """Dynamic attribute access for model-specific handlers.
+
+        Allows @encryption.decrypt.json.thread, @encryption.decrypt.json.assistant, etc.
+
+        Raises:
+            DuplicateHandlerError: If handler already registered for this model
+            TypeError: If handler has invalid signature
+        """
+
+        def decorator(fn: types.JsonDecryptor) -> types.JsonDecryptor:
+            if model in self._parent._json_decryptors:
+                raise DuplicateHandlerError(
+                    f"JSON decryptor for model '{model}' already registered"
+                )
+            _validate_handler(fn, f"JSON decryptor for model '{model}'")
+            self._parent._json_decryptors[model] = fn
+            return fn
+
+        return decorator
+
+
 class _EncryptDecorators:
    """Decorators for encryption handlers.

@@ -73,6 +181,7 @@ class _EncryptDecorators:

    def __init__(self, parent: Encryption):
        self._parent = parent
+        self._json = _JsonEncryptDecorators(parent)

    def blob(self, fn: types.BlobEncryptor) -> types.BlobEncryptor:
        """Register a blob encryption handler.
@@ -103,32 +212,29 @@ class _EncryptDecorators:
        self._parent._blob_encryptor = fn
        return fn

-    def json(self, fn: types.JsonEncryptor) -> types.JsonEncryptor:
-        """Register the JSON encryption handler.
+    @property
+    def json(self) -> _JsonEncryptDecorators:
+        """Access JSON encryption decorators.
+
+        Supports model-specific handlers:
+        - @encryption.encrypt.json - default handler for all models
+        - @encryption.encrypt.json.thread - handler for thread model only
+        - @encryption.encrypt.json.assistant - handler for assistant model only

        Example:
            ```python
            @encryption.encrypt.json
-            async def encrypt_json(ctx: EncryptionContext, data: dict) -> dict:
-                # Encrypt the data
+            async def default_encrypt(ctx: EncryptionContext, data: dict) -> dict:
+                # Default encryption for all models
                return encrypt_data(data)
+
+            @encryption.encrypt.json.thread
+            async def encrypt_thread(ctx: EncryptionContext, data: dict) -> dict:
+                # Special encryption for thread model only
+                return encrypt_thread_data(data)
            ```
-
-        Args:
-            fn: The encryption handler function
-
-        Returns:
-            The registered handler function
-
-        Raises:
-            DuplicateHandlerError: If JSON encryptor already registered
-            TypeError: If handler has invalid signature
        """
-        if self._parent._json_encryptor is not None:
-            raise DuplicateHandlerError("JSON encryptor already registered")
-        _validate_handler(fn, "JSON encryptor")
-        self._parent._json_encryptor = fn
-        return fn
+        return self._json


 class _DecryptDecorators:
@@ -140,6 +246,7 @@ class _DecryptDecorators:

    def __init__(self, parent: Encryption):
        self._parent = parent
+        self._json = _JsonDecryptDecorators(parent)

    def blob(self, fn: types.BlobDecryptor) -> types.BlobDecryptor:
        """Register a blob decryption handler.
@@ -170,32 +277,29 @@ class _DecryptDecorators:
        self._parent._blob_decryptor = fn
        return fn

-    def json(self, fn: types.JsonDecryptor) -> types.JsonDecryptor:
-        """Register the JSON decryption handler.
+    @property
+    def json(self) -> _JsonDecryptDecorators:
+        """Access JSON decryption decorators.
+
+        Supports model-specific handlers:
+        - @encryption.decrypt.json - default handler for all models
+        - @encryption.decrypt.json.thread - handler for thread model only
+        - @encryption.decrypt.json.assistant - handler for assistant model only

        Example:
            ```python
            @encryption.decrypt.json
-            async def decrypt_json(ctx: EncryptionContext, data: dict) -> dict:
-                # Decrypt the data
+            async def default_decrypt(ctx: EncryptionContext, data: dict) -> dict:
+                # Default decryption for all models
                return decrypt_data(data)
+
+            @encryption.decrypt.json.thread
+            async def decrypt_thread(ctx: EncryptionContext, data: dict) -> dict:
+                # Special decryption for thread model only
+                return decrypt_thread_data(data)
            ```
-
-        Args:
-            fn: The decryption handler function
-
-        Returns:
-            The registered handler function
-
-        Raises:
-            DuplicateHandlerError: If JSON decryptor already registered
-            TypeError: If handler has invalid signature
        """
-        if self._parent._json_decryptor is not None:
-            raise DuplicateHandlerError("JSON decryptor already registered")
-        _validate_handler(fn, "JSON decryptor")
-        self._parent._json_decryptor = fn
-        return fn
+        return self._json


 class Encryption:
@@ -232,28 +336,6 @@ class Encryption:
    Then the LangGraph server will load your encryption file and use it to
    encrypt/decrypt data at rest.

-    !!! warning "JSON Encryptors Must Preserve Keys"
-
-        JSON encryptors **must not add or remove keys** from the input dict.
-        Only values may be transformed. This constraint is **enforced at runtime
-        by the server** and exists because SQL JSONB merge operations (used for
-        partial updates) work at the key level.
-
-        **Correct (per-key encryption):**
-        ```python
-        # Input:  {"secret": "value", "plain": "x"}
-        # Output: {"secret": "<encrypted>", "plain": "x"}  ✓ Keys preserved
-        ```
-
-        **Incorrect (key consolidation):**
-        ```python
-        # Input:  {"secret": "value", "plain": "x"}
-        # Output: {"__encrypted__": "<blob>", "plain": "x"}  ✗ Key changed
-        ```
-
-        If your encryptor needs to store auxiliary data (DEK, IV, etc.), embed it
-        within the encrypted value itself, not as separate keys.
-
    ???+ example "Basic Usage"

        ```python
@@ -261,48 +343,89 @@ class Encryption:

        my_encryption = Encryption()

-        SKIP_FIELDS = {"tenant_id", "owner", "thread_id", "assistant_id"}
-        ENCRYPTED_PREFIX = "encrypted:"
-
        @my_encryption.encrypt.blob
        async def encrypt_blob(ctx: EncryptionContext, blob: bytes) -> bytes:
-            return your_encrypt_bytes(blob)
+            # Call your encryption service
+            return encrypted_blob

        @my_encryption.decrypt.blob
        async def decrypt_blob(ctx: EncryptionContext, blob: bytes) -> bytes:
-            return your_decrypt_bytes(blob)
+            # Call your decryption service
+            return decrypted_blob

        @my_encryption.encrypt.json
        async def encrypt_json(ctx: EncryptionContext, data: dict) -> dict:
-            result = {}
-            for k, v in data.items():
-                if k in SKIP_FIELDS or v is None:
-                    result[k] = v
+            # Practical encryption strategy:
+            # - "owner" field: unencrypted (for search/filtering)
+            # - "my.customer.org/" prefixed fields: encrypt VALUES only
+            # - All other fields: pass through unencrypted
+            encrypted = {}
+            for key, value in data.items():
+                if key.startswith("my.customer.org/"):
+                    # Encrypt VALUE for sensitive customer data
+                    encrypted[key] = encrypt_value(value)
                else:
-                    result[k] = ENCRYPTED_PREFIX + your_encrypt_string(v)
-            return result
+                    # Pass through (including "owner" for search)
+                    encrypted[key] = value
+            return encrypted

        @my_encryption.decrypt.json
        async def decrypt_json(ctx: EncryptionContext, data: dict) -> dict:
-            result = {}
-            for k, v in data.items():
-                if isinstance(v, str) and v.startswith(ENCRYPTED_PREFIX):
-                    result[k] = your_decrypt_string(v[len(ENCRYPTED_PREFIX):])
+            # Decrypt VALUES for "my.customer.org/" prefixed fields
+            decrypted = {}
+            for key, value in data.items():
+                if key.startswith("my.customer.org/"):
+                    decrypted[key] = decrypt_value(value)
                else:
-                    result[k] = v
-            return result
+                    decrypted[key] = value
+            return decrypted
+        ```
+
+    ???+ example "Model-Specific Handlers"
+
+        You can register different encryption handlers for different model types
+        (thread, assistant, run, cron, checkpoint, etc.):
+
+        ```python
+        from langgraph_sdk import Encryption, EncryptionContext
+
+        my_encryption = Encryption()
+
+        # Default handler for models without specific handlers
+        @my_encryption.encrypt.json
+        async def default_encrypt(ctx: EncryptionContext, data: dict) -> dict:
+            return standard_encrypt(data)
+
+        # Thread-specific handler (uses different KMS key)
+        @my_encryption.encrypt.json.thread
+        async def encrypt_thread(ctx: EncryptionContext, data: dict) -> dict:
+            return encrypt_with_thread_key(data)
+
+        # Assistant-specific handler
+        @my_encryption.encrypt.json.assistant
+        async def encrypt_assistant(ctx: EncryptionContext, data: dict) -> dict:
+            return encrypt_with_assistant_key(data)
+
+        # Same pattern for decryption
+        @my_encryption.decrypt.json
+        async def default_decrypt(ctx: EncryptionContext, data: dict) -> dict:
+            return standard_decrypt(data)
+
+        @my_encryption.decrypt.json.thread
+        async def decrypt_thread(ctx: EncryptionContext, data: dict) -> dict:
+            return decrypt_with_thread_key(data)
        ```

    ???+ example "Field-Specific Logic"

-        The `ctx.model` and `ctx.field` attributes tell you which model type and
-        specific field is being encrypted, allowing different logic:
+        The `ctx.field` attribute tells you which specific field is being encrypted,
+        allowing different logic within the same model:

        ```python
-        @my_encryption.encrypt.json
-        async def encrypt_json(ctx: EncryptionContext, data: dict) -> dict:
+        @my_encryption.encrypt.json.thread
+        async def encrypt_thread(ctx: EncryptionContext, data: dict) -> dict:
            if ctx.field == "metadata":
-                # Metadata - standard encryption
+                # Thread metadata - standard encryption
                return encrypt_standard(data)
            elif ctx.field == "values":
                # Thread values - more sensitive, use stronger encryption
@@ -310,49 +433,6 @@ class Encryption:
            else:
                return encrypt_standard(data)
        ```
-
-        !!! warning "Model/Field May Differ Between Encrypt and Decrypt"
-
-            Data encrypted with one `(model, field)` pair is **not guaranteed**
-            to be decrypted with the same pair. The server performs SQL JSONB
-            merges that can move encrypted values between models (e.g., cron
-            metadata → run metadata). Your decryption logic must handle data
-            regardless of the `ctx.model` or `ctx.field` values at decrypt time.
-
-            **Safe:** Use `ctx.model`/`ctx.field` for logging or metrics only.
-
-            **Safe:** Encrypt different keys based on `ctx.field`, but use a
-            single decrypt handler that decrypts any value with the encrypted
-            prefix (and passes through plaintext unchanged):
-
-            ```python
-            ENCRYPTED_PREFIX = "enc:"
-
-            @my_encryption.encrypt.json
-            async def encrypt_json(ctx: EncryptionContext, data: dict) -> dict:
-                # Encrypt different keys depending on the field
-                if ctx.field == "context":
-                    keys_to_encrypt = {"api_key", "secret_token"}
-                else:
-                    keys_to_encrypt = {"email", "ssn"}
-                return {
-                    k: ENCRYPTED_PREFIX + encrypt(v) if k in keys_to_encrypt else v
-                    for k, v in data.items()
-                }
-
-            @my_encryption.decrypt.json
-            async def decrypt_json(ctx: EncryptionContext, data: dict) -> dict:
-                # Decrypt ANY value with the prefix, regardless of model/field
-                return {
-                    k: decrypt(v[len(ENCRYPTED_PREFIX):])
-                       if isinstance(v, str) and v.startswith(ENCRYPTED_PREFIX)
-                       else v
-                    for k, v in data.items()
-                }
-            ```
-
-            **Unsafe:** Using different encryption keys or algorithms based on
-            `ctx.model`/`ctx.field` will cause decryption failures.
    """

    __slots__ = (
@@ -360,7 +440,9 @@ class Encryption:
        "_blob_encryptor",
        "_context_handler",
        "_json_decryptor",
+        "_json_decryptors",
        "_json_encryptor",
+        "_json_encryptors",
        "decrypt",
        "encrypt",
    )
@@ -382,6 +464,8 @@ class Encryption:
        self._blob_decryptor: types.BlobDecryptor | None = None
        self._json_encryptor: types.JsonEncryptor | None = None
        self._json_decryptor: types.JsonDecryptor | None = None
+        self._json_encryptors: dict[str, types.JsonEncryptor] = {}
+        self._json_decryptors: dict[str, types.JsonDecryptor] = {}
        self._context_handler: types.ContextHandler | None = None

    def context(self, fn: types.ContextHandler) -> types.ContextHandler:
@@ -422,33 +506,33 @@ class Encryption:
        return fn

    def get_json_encryptor(
-        self,
-        _model: str | None = None,  # kept for langgraph-api compat
+        self, model: str | None = None
    ) -> types.JsonEncryptor | None:
-        """Get the JSON encryptor.
+        """Get the JSON encryptor for a specific model.

        Args:
-            _model: Ignored. Kept for backwards compatibility with langgraph-api
-                which passes model_type to this method.
+            model: The model type (e.g., "thread", "assistant"). If None, returns default.

        Returns:
-            The JSON encryptor, or None if not registered.
+            Model-specific encryptor if registered, otherwise default encryptor, or None.
        """
+        if model and model in self._json_encryptors:
+            return self._json_encryptors[model]
        return self._json_encryptor

    def get_json_decryptor(
-        self,
-        _model: str | None = None,  # kept for langgraph-api compat
+        self, model: str | None = None
    ) -> types.JsonDecryptor | None:
-        """Get the JSON decryptor.
+        """Get the JSON decryptor for a specific model.

        Args:
-            _model: Ignored. Kept for backwards compatibility with langgraph-api
-                which passes model_type to this method.
+            model: The model type (e.g., "thread", "assistant"). If None, returns default.

        Returns:
-            The JSON decryptor, or None if not registered.
+            Model-specific decryptor if registered, otherwise default decryptor, or None.
        """
+        if model and model in self._json_decryptors:
+            return self._json_decryptors[model]
        return self._json_decryptor

    def __repr__(self) -> str:
@@ -461,6 +545,10 @@ class Encryption:
            handlers.append("json_encryptor")
        if self._json_decryptor:
            handlers.append("json_decryptor")
+        if self._json_encryptors:
+            handlers.append(f"json_encryptors({list(self._json_encryptors.keys())})")
+        if self._json_decryptors:
+            handlers.append(f"json_decryptors({list(self._json_decryptors.keys())})")
        if self._context_handler:
            handlers.append("context_handler")
        return f"Encryption(handlers=[{', '.join(handlers)}])"
@@ -26,6 +26,14 @@ class TestHandlerValidation:
        async def json_dec(_ctx, data):
            return data

+        @encryption.encrypt.json.thread
+        async def thread_enc(_ctx, data):
+            return data
+
+        @encryption.decrypt.json.custom
+        async def custom_dec(_ctx, data):
+            return data
+
        # All duplicates should raise
        with pytest.raises(DuplicateHandlerError):

@@ -51,6 +59,18 @@ class TestHandlerValidation:
            async def dup(_ctx, data):
                return data

+        with pytest.raises(DuplicateHandlerError):
+
+            @encryption.encrypt.json.thread
+            async def dup(_ctx, data):
+                return data
+
+        with pytest.raises(DuplicateHandlerError):
+
+            @encryption.decrypt.json.custom
+            async def dup(_ctx, data):
+                return data
+
    def test_handlers_must_be_async(self):
        """Sync functions raise TypeError."""
        encryption = Encryption()