feat: add HitlSchema types and dynamic schema dispatch for QuickForm tasks

Adds a new `hitl/` module to `uipath-platform` with `HitlSchema`,
`HitlSchemaField`, `HitlSchemaOutcome`, `HitlFieldType`, and
`HitlFieldDirection` — a Python mirror of `@uipath/hitl-schema-types`.

`pydantic_to_hitl_schema()` converts Pydantic models into `HitlSchema`
instances. Field aliases become the schema field IDs, enabling PascalCase
form field names while keeping Python field names snake_case.

`CreateTask` gains an optional `hitl_schema` field. When set,
`_handle_task_trigger` routes to `create_quickform_async` instead of
`create_async`, sending the schema inline to `GenericTasks/CreateTask`
(type=6). A deterministic UUID derived from the schema content is used
as `taskSchemaKey` so Orchestrator can upsert rather than duplicate.

No pre-deployed Action App is required when a schema is provided.

Author: dushyant-uipath

packages/uipath-platform/src/uipath/platform/common/__init__.py

@@ -27,6 +27,14 @@
 from ._user_agent import user_agent_value
 from .auth import TokenData
 from .dynamic_schema import jsonschema_to_pydantic
+from ..hitl import (
+    HitlFieldDirection,
+    HitlFieldType,
+    HitlSchema,
+    HitlSchemaField,
+    HitlSchemaOutcome,
+    pydantic_to_hitl_schema,
+)
 from .interrupt_models import (
     CreateBatchTransform,
     CreateDeepRag,
@@ -102,6 +110,12 @@
     "validate_pagination_params",
     "EndpointManager",
     "jsonschema_to_pydantic",
+    "HitlFieldDirection",
+    "HitlFieldType",
+    "HitlSchema",
+    "HitlSchemaField",
+    "HitlSchemaOutcome",
+    "pydantic_to_hitl_schema",
     "ConnectionResourceOverwrite",
     "EntityResourceOverwrite",
     "GenericResourceOverwrite",

packages/uipath-platform/src/uipath/platform/common/interrupt_models.py

@@ -10,6 +10,7 @@
 
 from ..action_center.tasks import Task, TaskRecipient
 from ..attachments import Attachment
+from ..hitl.models import HitlSchema
 from ..context_grounding import (
     BatchTransformCreationResponse,
     BatchTransformOutputColumn,
@@ -58,7 +59,12 @@ class WaitJobRaw(WaitJob):
 
 
 class CreateTask(BaseModel):
-    """Model representing an action creation."""
+    """Model representing an action creation.
+
+    When *schema* is set the runtime creates a schema-driven **QuickForm** task
+    (``GenericTasks/CreateTask``, ``type=6``) instead of an action-app task.
+    No pre-deployed Action App is required in that case.
+    """
 
     title: str
     data: dict[str, Any] | None = None
@@ -73,6 +79,7 @@ class CreateTask(BaseModel):
     is_actionable_message_enabled: bool | None = None
     actionable_message_metadata: dict[str, Any] | None = None
     source_name: str = "Agent"
+    hitl_schema: HitlSchema | None = None
 
 
 class CreateEscalation(CreateTask):

packages/uipath-platform/src/uipath/platform/hitl/__init__.py

@@ -0,0 +1,47 @@
+"""HITL form schema types and generator.
+
+Provides Python-native representations of the HITL schema format and a utility
+to generate schemas from Pydantic models.  The generated schema can be attached
+to :class:`~uipath.platform.common.CreateTask` or
+:class:`~uipath.platform.common.CreateEscalation` so the runtime creates a
+QuickForm task with an inline schema instead of requiring a pre-deployed
+Action App.
+
+Example::
+
+    from uipath.platform.hitl import HitlSchema, pydantic_to_hitl_schema
+    from pydantic import BaseModel, Field
+
+    class ReviewInputs(BaseModel):
+        flagged_content: str = Field(title="Flagged Content")
+        reason: str = Field(title="Reason")
+
+    class ReviewOutputs(BaseModel):
+        decision: str = Field(default="", title="Decision")
+        notes: str = Field(default="", title="Notes")
+
+    schema = pydantic_to_hitl_schema(
+        input_model=ReviewInputs,
+        output_model=ReviewOutputs,
+        outcomes=["Approve", "Reject"],
+        title="Content Review",
+    )
+"""
+
+from .models import (
+    HitlFieldDirection,
+    HitlFieldType,
+    HitlSchema,
+    HitlSchemaField,
+    HitlSchemaOutcome,
+)
+from .schema_gen import pydantic_to_hitl_schema
+
+__all__ = [
+    "HitlFieldDirection",
+    "HitlFieldType",
+    "HitlSchema",
+    "HitlSchemaField",
+    "HitlSchemaOutcome",
+    "pydantic_to_hitl_schema",
+]

packages/uipath-platform/src/uipath/platform/hitl/models.py

@@ -0,0 +1,76 @@
+"""Python representation of the HITL form schema format.
+
+Mirrors the TypeScript ``HitlSchema`` interface from ``@uipath/hitl-schema-types``
+and is compatible with the QuickForm task endpoint
+(``GenericTasks/CreateTask``, ``type=6``).
+"""
+
+from enum import Enum
+from typing import Any
+
+from pydantic import BaseModel, Field
+
+
+class HitlFieldType(str, Enum):
+    """Types supported by HITL form fields."""
+
+    STRING = "string"
+    NUMBER = "number"
+    INTEGER = "integer"
+    FLOAT = "float"
+    DOUBLE = "double"
+    BOOLEAN = "boolean"
+    DATE = "date"
+    DATETIME = "datetime"
+    FILE = "file"
+    OBJECT = "object"
+    ARRAY = "array"
+
+
+class HitlFieldDirection(str, Enum):
+    """Direction of a HITL form field.
+
+    - ``INPUT``  — read-only display, pre-populated from task data.
+    - ``OUTPUT`` — editable by the human reviewer, written to a variable on submit.
+    - ``IN_OUT`` — both pre-populated and editable.
+    """
+
+    INPUT = "input"
+    OUTPUT = "output"
+    IN_OUT = "inOut"
+
+
+class HitlSchemaField(BaseModel):
+    """A single field in a HITL form schema."""
+
+    id: str
+    label: str | None = None
+    type: HitlFieldType = HitlFieldType.STRING
+    direction: HitlFieldDirection = HitlFieldDirection.INPUT
+    required: bool | None = None
+
+
+class HitlSchemaOutcome(BaseModel):
+    """An outcome button in a HITL form schema (e.g. Approve / Reject)."""
+
+    id: str
+    label: str | None = None
+
+
+class HitlSchema(BaseModel):
+    """A dynamic HITL form schema generated from Python type annotations.
+
+    Attach to :class:`~uipath.platform.common.CreateTask` or
+    :class:`~uipath.platform.common.CreateEscalation` so the runtime creates a
+    schema-driven QuickForm task instead of an action-app task.  No pre-deployed
+    Action App is required when a schema is provided.
+    """
+
+    id: str | None = None
+    title: str | None = None
+    fields: list[HitlSchemaField] = Field(default_factory=list)
+    outcomes: list[HitlSchemaOutcome] = Field(default_factory=list)
+
+    def to_wire_format(self) -> dict[str, Any]:
+        """Serialise to the dict expected by the QuickForm task API."""
+        return self.model_dump(mode="json", exclude_none=True)

packages/uipath-platform/src/uipath/platform/hitl/schema_gen.py

@@ -0,0 +1,143 @@
+"""Generate a :class:`HitlSchema` from Python type annotations.
+
+The primary entry point is :func:`pydantic_to_hitl_schema`, which converts
+Pydantic ``BaseModel`` classes into the :class:`HitlSchema` format consumed by
+Action Center's QuickForm task endpoint.
+"""
+
+from __future__ import annotations
+
+import inspect
+import re
+from types import UnionType
+from typing import Any, Union, get_args, get_origin
+
+from pydantic import BaseModel
+
+from .models import (
+    HitlFieldDirection,
+    HitlFieldType,
+    HitlSchema,
+    HitlSchemaField,
+    HitlSchemaOutcome,
+)
+
+
+def _annotation_to_hitl_type(annotation: Any) -> HitlFieldType:
+    """Map a Python type annotation to the closest :class:`HitlFieldType`."""
+    if annotation is None or annotation is inspect.Parameter.empty:
+        return HitlFieldType.STRING
+
+    origin = get_origin(annotation)
+    args = get_args(annotation)
+
+    # Handle Optional[T] / T | None (both typing.Union and PEP 604 UnionType)
+    if origin is Union or isinstance(annotation, UnionType):
+        non_none = [a for a in args if a is not type(None)]
+        if non_none:
+            return _annotation_to_hitl_type(non_none[0])
+        return HitlFieldType.STRING
+
+    if origin in (list, tuple):
+        return HitlFieldType.ARRAY
+    if origin is dict:
+        return HitlFieldType.OBJECT
+
+    if not inspect.isclass(annotation):
+        return HitlFieldType.STRING
+
+    # Check bool before int — bool is a subclass of int
+    if issubclass(annotation, bool):
+        return HitlFieldType.BOOLEAN
+    if issubclass(annotation, int):
+        return HitlFieldType.INTEGER
+    if issubclass(annotation, float):
+        return HitlFieldType.NUMBER
+    if issubclass(annotation, str):
+        return HitlFieldType.STRING
+    if issubclass(annotation, (list, tuple)):
+        return HitlFieldType.ARRAY
+    if issubclass(annotation, dict):
+        return HitlFieldType.OBJECT
+    if issubclass(annotation, BaseModel):
+        return HitlFieldType.OBJECT
+
+    return HitlFieldType.STRING
+
+
+def _label_from_name(name: str) -> str:
+    """Produce a human-readable label from a snake_case or PascalCase name."""
+    # PascalCase → insert space before each capital that follows a lowercase letter
+    spaced = re.sub(r"(?<=[a-z])(?=[A-Z])", " ", name)
+    # Underscores → spaces
+    spaced = spaced.replace("_", " ")
+    return spaced.title()
+
+
+def pydantic_to_hitl_schema(
+    *,
+    input_model: type[BaseModel] | None = None,
+    output_model: type[BaseModel] | None = None,
+    outcomes: list[str] | None = None,
+    title: str | None = None,
+) -> HitlSchema:
+    """Generate a :class:`HitlSchema` from Pydantic input and output models.
+
+    Fields from *input_model* become ``direction="input"`` fields (read-only,
+    pre-populated from task data).  Fields from *output_model* become
+    ``direction="output"`` fields (editable by the human reviewer).
+
+    The field ``id`` is taken from ``field_info.alias`` when one is set,
+    otherwise from the Python field name.  Set an alias on a Pydantic field
+    to control the id that Action Center uses (useful when the form contract
+    requires PascalCase names but Python convention is snake_case).
+
+    Args:
+        input_model: Pydantic model for data shown to the reviewer.
+        output_model: Pydantic model for data the reviewer fills in.
+        outcomes: Outcome button labels.  Defaults to ``["Approve", "Reject"]``.
+        title: Human-readable title for the form.
+
+    Returns:
+        A :class:`HitlSchema` ready to attach to
+        :class:`~uipath.platform.common.CreateTask`.
+    """
+    if outcomes is None:
+        outcomes = ["Approve", "Reject"]
+
+    fields: list[HitlSchemaField] = []
+
+    if input_model is not None:
+        for name, field_info in input_model.model_fields.items():
+            field_id = field_info.alias or name
+            fields.append(
+                HitlSchemaField(
+                    id=str(field_id),
+                    label=field_info.title or _label_from_name(str(field_id)),
+                    type=_annotation_to_hitl_type(field_info.annotation),
+                    direction=HitlFieldDirection.INPUT,
+                    required=True if field_info.is_required() else None,
+                )
+            )
+
+    if output_model is not None:
+        for name, field_info in output_model.model_fields.items():
+            field_id = field_info.alias or name
+            fields.append(
+                HitlSchemaField(
+                    id=str(field_id),
+                    label=field_info.title or _label_from_name(str(field_id)),
+                    type=_annotation_to_hitl_type(field_info.annotation),
+                    direction=HitlFieldDirection.OUTPUT,
+                    required=None,
+                )
+            )
+
+    return HitlSchema(
+        title=title,
+        fields=fields,
+        outcomes=[
+            HitlSchemaOutcome(id=outcome.lower(), label=outcome)
+            for outcome in outcomes
+        ],
+    )