Client

import labelbox as lb
client = lb.Client(api_key="<YOUR_API_KEY>")

Fundamentals

Workflows are connected to the Project class and are generated automatically during project creation. Workflows help organize and control the flow of labeling tasks through different stages. Key concepts:

Workflows are composed of nodes and edges.
Each node can have only one input connection, except when both Initial labeling task and Rework (All Rejected) nodes serve as inputs to a single downstream node.
No changes are pushed to the platform until you call update_config().
All nodes must be connected for the workflow to be valid.

Access a workflow

project.get_workflow()

Clone a workflow from a different project

project_source_id = "<project_source_id>"
project_target_id = "<project_target_id>"
project_source = client.get_project(project_source_id)
project_target = client.get_project(project_target_id)

project_target.clone_workflow_from(project_source.uid)

Reset a workflow

Use reset_to_initial_nodes() to only have the InitialLabeling and InitialRework nodes and start from scratch. The method will return an object InitialNodes with two attributes labeling and rework. You can also pass parameters to configure the initial nodes.

# Get initial nodes with basic status
initial_nodes = workflow.reset_to_initial_nodes()

initial_labeling = initial_nodes.labeling
initial_rework = initial_nodes.rework

# Configure initial nodes
# All parameters are optional 
from labelbox.schema.workflow.config import LabelingConfig, ReworkConfig
from labelbox.schema.workflow.enums import IndividualAssignment

initial_nodes = workflow.reset_to_initial_nodes(
    labeling_config=LabelingConfig(
        instructions="Instructions for labeling",
        max_contributions_per_user=10
    ),
    rework_config=ReworkConfig(
        instructions="Instructions for reworking",
        individual_assignment=[IndividualAssignment.LabelCreator],
        max_contributions_per_user=5
    )
)

Commit changes

To push changes made to a workflow, you must use update_config(). In case of validation issue, it will throw a ValueError exception.

# Commit changes without changing node locations
workflow.update_config()

# Commit changes and attempt to realign nodes
workflow.update_config(reposition=True)

Nodes

Add a node

Types of nodes are listed in the enum NodeType: Initial nodes:

NodeType.InitialLabeling - Entry point for new labeling tasks
NodeType.InitialRework - Entry point for tasks that need to be reworked

Step nodes:

NodeType.Review - Review completed labels
NodeType.Logic - Apply filters to route tasks conditionally
NodeType.CustomRework - Custom rework step with configurable settings

Terminal nodes:

NodeType.Done - Marks tasks as completed
NodeType.Rework - Sends tasks back to the rework queue
NodeType.CustomRework can be used as a terminal node or be connected to another node.

NodeType.CustomRework can be used as a terminal node or be connected to another node.

from labelbox.schema.workflow import NodeType

review_node = workflow.add_node(type=NodeType.Review)

Delete a node

This automatically removes connected edges. Initial nodes can’t be deleted.

# Get nodes to delete
nodes_to_delete = [
    node
    for node in workflow.get_nodes()
    if node.name == "NodeToDelete"
]

workflow.delete_nodes(nodes_to_delete)

Edges

Add an edge

Edges connect the output of a source node to the input of a target node. All nodes must be connected in the workflow. Types of outputs are listed in the enum NodeOutput:

NodeOutput.If (default value, can be omitted)
NodeOutput.Else
NodeOutput.Approved
NodeOutput.Rejected

Outputs per node

Node	Available outputs
`InitialLabeling`	`NodeOutput.If`
`InitialRework`	`NodeOutput.If`
`Review`	`NodeOutput.Approved`, `NodeOutput.Rejected`
`Logic`	`NodeOutput.If`, `NodeOutput.Else`
`CustomRework`	Optional `NodeOutput.If`
`Done`
`Rework`

from labelbox.schema.workflow import NodeOutput

# Connect nodes with appropriate outputs
workflow.add_edge(initial_labeling, initial_review) # Default NodeOutput.If
workflow.add_edge(initial_rework, initial_review)
workflow.add_edge(initial_review, logic, NodeOutput.Approved)
workflow.add_edge(initial_review, rework_node, NodeOutput.Rejected)
workflow.add_edge(logic, done, NodeOutput.If) # NodeOutput.If can be omitted
workflow.add_edge(logic, custom_rework_1, NodeOutput.Else)

Node attributes

The following attributes can be configured for each node type:

Node	Configuratble attributes
`InitialLabeling`	`instructions`, `max_contributions_per_user`
`InitialRework`	`instructions`, `individual_assignment`, `max_contributions_per_user`
`Review`	`instructions`, `group_assignment`, `max_contributions_per_user`
`Logic`	`name`, `match_filters`, `filters`
`CustomRework`	`name`, `instructions`, `group_assignment`, `individual_assignment`, `max_contributions_per_user`
`Done`	`name`
`Rework`	`name`

Common attributes:

max_contributions_per_user: Positive integer representing the maximum number of labels per task queue (empty for no limit)
instructions: Custom instructions for labelers working on this node
group_assignment: List of user group IDs assigned to this node
individual_assignment: Individual assignment strategy (you can use the IndividualAssignment enum)

Filters

Logic node

The Logic node contains filters that determine how tasks flow through the workflow. The match_filters attribute controls how multiple filters are evaluated:

MatchFilters.Any: Match any of the filters (OR logic)
MatchFilters.All: Match all of the filters (AND logic)

Add and remove filters

from labelbox.schema.workflow.enums import WorkflowDefinitionId
from labelbox.schema.workflow.enums import FilterField

workflow = project.get_workflow()


logic = next(
    node for node in workflow.get_nodes()
    if node.definition_id == WorkflowDefinitionId.Logic
)
# logic = workflow.get_node_by_id("0359113a-6081-4f48-83d1-175062a0259b")

# Remove a filter based on its type 
logic.remove_filter(FilterField.ModelPrediction)

# Apply changes
#workflow.update_config()

# Add a filter
logic.add_filter(
    model_prediction([
        mp_condition.is_none()
    ])
)

# Apply changes
#workflow.update_config()

Manage filters on Logic nodes

from labelbox.schema.workflow.enums import WorkflowDefinitionId, FilterField
from labelbox.schema.workflow import mp_condition, model_prediction

workflow = project.get_workflow()

# Get the Logic node
logic = next(
    node for node in workflow.get_nodes()
    if node.definition_id == WorkflowDefinitionId.Logic
)
# Alternative: get by node ID
# logic = workflow.get_node_by_id("0359113a-6081-4f48-83d1-175062a0259b")

# Remove a filter based on its type 
logic.remove_filter(FilterField.ModelPrediction)

# Add a filter
logic.add_filter(
    model_prediction([
        mp_condition.is_none()
    ])
)

# Apply changes
workflow.update_config()

Available filters

Each filter type can be used at most once per Logic node. The enum FilterField provides available filters for search or deletion:

FilterField.Annotation
FilterField.Batch
FilterField.ConsensusAverage
FilterField.Dataset
FilterField.FeatureConsensusAverage
FilterField.IssueCategory
FilterField.LabelingTime
FilterField.LabeledAt
FilterField.LabeledBy
FilterField.Metadata
FilterField.ModelPrediction
FilterField.NlSearch
FilterField.ReviewTime
FilterField.Sample

annotation

Filter by the presence of specific annotations. schema_node_ids is a list of schema node IDs that correspond to tools or classifications defined in the project’s ontology schema. Operators: None (direct list filter)

from labelbox.schema.workflow import annotation

# Using named parameter
annotation(schema_node_ids=["<schema_node_id>"])

# Using positional parameter
annotation(["<schema_node_id>"])

batch

Filter by batch membership. **Operators: **

is_one_of
is_not_one_of

from labelbox.schema.workflow import batch

# Using named parameter
batch.is_one_of(values=["<batch_id>"])

# Using positional parameter
batch.is_one_of(["<batch_id>"])

consensus_average

Filter by overall consensus score. Operators: None (range filter with min/max)

from labelbox.schema.workflow import consensus_average

# Using named parameters
consensus_average(min=0.17, max=0.61)

# Using positional parameters
consensus_average(0.17, 0.61)

dataset

Filter by dataset membership. Operators: None (direct list filter)

from labelbox.schema.workflow import dataset

# Using named parameter
dataset(dataset_ids=["<dataset_id>"])

# Using positional parameter
dataset(["<dataset_id>"])

feature_consensus_average

Filter by consensus score for specific features. annotations is a list of schema node IDs that correspond to tools or classifications defined in the project’s ontology schema. Operators: None (range filter with min/max and annotation list)

from labelbox.schema.workflow import feature_consensus_average

# Using named parameters
feature_consensus_average(min=0.17, max=0.67, annotations=["<schema_node_id>"])

# Using positional parameters
feature_consensus_average(0.17, 0.67, ["<schema_node_id>"])

issue_category

Filter by issue categories flagged during review. Operators:

is_one_of

from labelbox.schema.workflow import issue_category

# Using named parameter
issue_category.is_one_of(category_ids=["<issue_category_id>"])

# Using positional parameter
issue_category.is_one_off(["<issue_category_id>"])

labeling_time

Filter by how long it took to create the label. The value represents a number of seconds. Operators:

greater_than
less_than
greater_than_or_equal
less_than_or_equal
between

from labelbox.schema.workflow import labeling_time

# Using named parameter
labeling_time.greater_than(seconds=1000)

# Using positional parameter
labeling_time.greater_than(1000)

labeled_at

Filter by when the label was created. Operators:

between

from labelbox.schema.workflow import labeled_at
from datetime import datetime

# Using named parameters
labeled_at.between(
    start=datetime(2024, 3, 9, 5, 5, 42), 
    end=datetime(2025, 4, 28, 13, 5, 42)
)

# Using positional parameters
labeled_at.between(
    datetime(2024, 3, 9, 5, 5, 42), 
    datetime(2025, 4, 28, 13, 5, 42)
)

labeled_by

Filter by the user who created the label. Operators:

is_one_of

from labelbox.schema.workflow import labeled_by

# Using named parameter
labeled_by.is_one_of(user_ids=["<user_1_id>", "<user_2_id>"])

# Using positional parameter
labeled_by.is_one_of(["<user_1_id>", "<user_2_id>"])

metadata

Filter by data row metadata values. Each condition m_condition) takes a metadata schema ID key) and list of strings as parameters value). Operators:

contains
starts_with
ends_with
does_not_contain
is_any
is_not_any

from labelbox.schema.workflow import metadata, m_condition

# Using named parameters
metadata(conditions=[m_condition.contains(key="<metadata_schema_id>", value=["test"])])

# Using positional parameters
metadata([m_condition.contains("<metadata_schema_id>", ["test"])])

model_prediction

Filter by model predictions. Model predictions use a list of conditions named mp_condition. Each condition takes a list of model IDs, followed by an integer for the minimum score min_score) and an integer for the optional maxim score max_score). is_none takes precedence over other operators. Operators:

is_one_of
is_not_one_of
is_none

from labelbox.schema.workflow import model_prediction, mp_condition

# Using named parameter
model_prediction(conditions=[
    mp_condition.is_one_of(models=["<model_id>"], min_score=1),
    mp_condition.is_not_one_of(models=["<model_id>"], min_score=2, max_score=6),
    mp_condition.is_none()
])

# Using positional parameter
model_prediction([
    mp_condition.is_one_of(["<model_id>"], 1),
    mp_condition.is_not_one_of(["<model_id>"], 2, 6),
    mp_condition.is_none()
])

natural_language

Filter using semantic search. The content (or prompt) follows this format: "Find this / more of this / not this / bias_value" where bias_value is a decimal between 0 and 1. Operators: None (semantic search with score range)

from labelbox.schema.workflow import natural_language

# Using named parameters
natural_language(
    content="Birds in the sky/Blue sky/clouds/0.5", 
    min_score=0.178, 
    max_score=0.768
)

# Using positional parameters
natural_language("Birds in the sky/Blue sky/clouds/0.5", 0.178, 0.768)

review_time

Filter by how long it took to review the label. Operators:

greater_than
less_than
greater_than_or_equal
less_than_or_equal
between

from labelbox.schema.workflow import review_time

# Using named parameter
review_time.less_than_or_equal(seconds=100)

# Using positional parameter
review_time.less_than_or_equal(100)

sample

Filter by percentage sampling. The percentage is entered as an integer. Operators: None (percentage value)

from labelbox.schema.workflow import sample

# Using named parameter
sample(percentage=23)

# Using positional parameter
sample(23)

Example: Create a minimal workflow

The following example will create a basic workflow with three nodes:

Initial labeling task
Rework (all rejected)
Done

import labelbox as lb
from labelbox.schema.workflow import NodeType

# Initialize client and project
client = lb.Client(api_key="<YOUR_API_KEY>")
project_id = "<project_id>"
project = client.get_project(project_id)

# Get workflow
workflow = project.get_workflow()

# Create nodes
initial_nodes = workflow.reset_to_initial_nodes()
done = workflow.add_node(type=NodeType.Done)

# Connect nodes
workflow.add_edge(initial_nodes.labeling, done)
workflow.add_edge(initial_nodes.rework, done)


# Validate and commit changes
try:
    updated_workflow = workflow.update_config(reposition=True)
    print("Workflow updated successfully!")
except ValueError as e:
    print(f"Validation failed: {e}")

Example: Showcase complete workflow

The following example shows all the nodes and filters.

import labelbox as lb
from labelbox.schema.workflow import (
    NodeType, 
    NodeOutput, 
    ProjectWorkflowFilter,
    LabelingConfig,
    ReworkConfig,
    labeled_by,
    metadata,
    sample,
    labeled_at,
    mp_condition,
    m_condition,
    labeling_time,
    review_time,
    issue_category,
    batch,
    dataset,
    annotation,
    consensus_average,
    model_prediction,
    natural_language,
    feature_consensus_average
)
from labelbox.schema.workflow.enums import IndividualAssignment, MatchFilters
from datetime import datetime

# Initialize client and project
client = lb.Client(api_key="<YOUR_API_KEY>")
project_id = "<project_id>"
project = client.get_project(project_id)

# Get workflow
workflow = project.get_workflow()

# Reset config to start a fresh workflow
initial_nodes = workflow.reset_to_initial_nodes(
    labeling_config=LabelingConfig(
        instructions="This is the entry point",
        max_contributions_per_user=10
    ),
    rework_config=ReworkConfig(
        individual_assignment=[IndividualAssignment.LabelCreator]
    )
)
initial_labeling = initial_nodes.labeling
initial_rework = initial_nodes.rework

initial_review = workflow.add_node(
    type=NodeType.Review,
    name="Initial review task",
    group_assignment=["<user_group_id_1>", "<user_group_id_2>"]
)

logic = workflow.add_node(
    type=NodeType.Logic,
    name="Logic node",
    match_filters=MatchFilters.Any,
    filters=ProjectWorkflowFilter([
        labeled_by.is_one_of(["<user_id_1>", "<user_id_2>", "<user_id_3>"]),
        metadata([m_condition.contains("<metadata_schema_id>", ["test"])]),
        sample(23),
        labeled_at.between(
            datetime(2024, 3, 9, 5, 5, 42), 
            datetime(2025, 4, 28, 13, 5, 42)
        ),
        labeling_time.greater_than(1000),
        review_time.less_than_or_equal(100),
        issue_category.is_one_of(["<issue_category_id>"]),
        batch.is_one_of(["<batch_id>"]),
        dataset.is_one_of(["<dataset_id>"]),
        annotation.is_one_of(["<schema_node_id>"]),
        consensus_average(0.17, 0.61),
        model_prediction([
            mp_condition.is_one_of(["<model_id_1>"], 1),
            mp_condition.is_not_one_of(["<model_id_2>"], 2, 6),
            mp_condition.is_none()
        ]),
        natural_language("Birds in the sky/Blue sky/clouds/0.5", 0.178, 0.768),
        feature_consensus_average(0.17, 0.67, ["<schema_node_id>"])
    ])
)

# Terminal and step nodes
done = workflow.add_node(type=NodeType.Done)
rework = workflow.add_node(type=NodeType.Rework, name="To rework")

custom_rework_1 = workflow.add_node(
    type=NodeType.CustomRework,
    name="Custom Rework 1",
    individual_assignment=IndividualAssignment.LabelCreator,
    group_assignment=["<user_group_id_1>", "<user_group_id_2>"]
)

review_2 = workflow.add_node(
    type=NodeType.Review,
    name="Review 2"
)

custom_rework_2 = workflow.add_node(
    type=NodeType.CustomRework,
    name="Custom Rework 2",
    instructions="Additional rework instructions"
)

done_2 = workflow.add_node(
    type=NodeType.Done,
    name="Ready for final review"
)

# Create edges between nodes
workflow.add_edge(initial_labeling, initial_review)
workflow.add_edge(initial_rework, initial_review)
workflow.add_edge(initial_review, logic, NodeOutput.Approved)
workflow.add_edge(initial_review, rework, NodeOutput.Rejected)
workflow.add_edge(logic, review_2, NodeOutput.If)
workflow.add_edge(logic, custom_rework_1, NodeOutput.Else)
workflow.add_edge(review_2, done, NodeOutput.Approved)
workflow.add_edge(review_2, custom_rework_2, NodeOutput.Rejected)
workflow.add_edge(custom_rework_2, done_2)

# Commit the workflow
try:
    updated_workflow = workflow.update_config(reposition=True)
    print("Workflow updated successfully!")
except ValueError as e:
    print(f"Validation failed: {e}")

​Client

​Fundamentals

​Access a workflow

​Clone a workflow from a different project

​Reset a workflow

​Commit changes

​Nodes

​Add a node

​Delete a node

​Edges

​Add an edge

​Outputs per node

​Node attributes

​Filters

​Logic node

​Add and remove filters

​Manage filters on Logic nodes

​Available filters

​annotation

​batch

​consensus_average

​dataset

​feature_consensus_average

​issue_category

​labeling_time

​labeled_at

​labeled_by

​metadata

​model_prediction

​natural_language

​review_time

​sample

​Example: Create a minimal workflow

​Example: Showcase complete workflow