v2 Workflow execution API — POST `/api/v2/workflows` executes a workflow; GET returns workflow status; POST `/api/v2/workflows/stop` halts a running workflow. The v2 workflow surface is the forward-looking execution interface for Langflow agents.
components:
schemas:
AccessTypeEnum:
enum:
- PRIVATE
- PUBLIC
title: AccessTypeEnum
type: string
AuthSettings:
description: Model representing authentication settings for MCP.
properties:
auth_type:
default: none
enum:
- none
- apikey
- oauth
title: Auth Type
type: string
oauth_auth_url:
anyOf:
- type: string
- type: 'null'
title: Oauth Auth Url
oauth_callback_path:
anyOf:
- type: string
- type: 'null'
title: Oauth Callback Path
oauth_callback_url:
anyOf:
- type: string
- type: 'null'
title: Oauth Callback Url
oauth_client_id:
anyOf:
- type: string
- type: 'null'
title: Oauth Client Id
oauth_client_secret:
anyOf:
- format: password
type: string
writeOnly: true
- type: 'null'
title: Oauth Client Secret
oauth_host:
anyOf:
- type: string
- type: 'null'
title: Oauth Host
oauth_mcp_scope:
anyOf:
- type: string
- type: 'null'
title: Oauth Mcp Scope
oauth_port:
anyOf:
- type: string
- type: 'null'
title: Oauth Port
oauth_provider_scope:
anyOf:
- type: string
- type: 'null'
title: Oauth Provider Scope
oauth_server_url:
anyOf:
- type: string
- type: 'null'
title: Oauth Server Url
oauth_token_url:
anyOf:
- type: string
- type: 'null'
title: Oauth Token Url
title: AuthSettings
type: object
Body_build_flow_api_v1_build__flow_id__flow_post:
properties:
data:
anyOf:
- $ref: '#/components/schemas/FlowDataRequest'
- type: 'null'
files:
anyOf:
- items:
type: string
type: array
- type: 'null'
title: Files
inputs:
anyOf:
- $ref: '#/components/schemas/InputValueRequest'
- type: 'null'
title: Body_build_flow_api_v1_build__flow_id__flow_post
type: object
Body_build_public_tmp_api_v1_build_public_tmp__flow_id__flow_post:
properties:
files:
anyOf:
- items:
type: string
type: array
- type: 'null'
title: Files
inputs:
anyOf:
- $ref: '#/components/schemas/InputValueRequest'
- type: 'null'
title: Body_build_public_tmp_api_v1_build_public_tmp__flow_id__flow_post
type: object
Body_experimental_run_flow_api_v1_run_advanced__flow_id_or_name__post:
properties:
inputs:
anyOf:
- items:
$ref: '#/components/schemas/InputValueRequest'
type: array
- type: 'null'
title: Inputs
outputs:
anyOf:
- items:
type: string
type: array
- type: 'null'
title: Outputs
session_id:
anyOf:
- type: string
- type: 'null'
title: Session Id
stream:
default: false
title: Stream
type: boolean
tweaks:
anyOf:
- $ref: '#/components/schemas/Tweaks'
- type: 'null'
title: Body_experimental_run_flow_api_v1_run_advanced__flow_id_or_name__post
type: object
Body_simplified_run_flow_api_v1_run__flow_id_or_name__post:
properties:
context:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
title: Context
input_request:
anyOf:
- $ref: '#/components/schemas/SimplifiedAPIRequest'
- type: 'null'
title: Body_simplified_run_flow_api_v1_run__flow_id_or_name__post
type: object
Body_upload_file_api_v1_files_upload__flow_id__post:
properties:
file:
contentMediaType: application/octet-stream
title: File
type: string
required:
- file
title: Body_upload_file_api_v1_files_upload__flow_id__post
type: object
Body_upload_file_api_v1_flows_upload__post:
properties:
file:
anyOf:
- contentMediaType: application/octet-stream
type: string
- type: 'null'
title: File
title: Body_upload_file_api_v1_flows_upload__post
type: object
Body_upload_file_api_v1_projects_upload__post:
properties:
file:
anyOf:
- contentMediaType: application/octet-stream
type: string
- type: 'null'
title: File
title: Body_upload_file_api_v1_projects_upload__post
type: object
Body_upload_user_file_api_v2_files__post:
properties:
file:
contentMediaType: application/octet-stream
title: File
type: string
required:
- file
title: Body_upload_user_file_api_v2_files__post
type: object
Body_upload_user_file_api_v2_files_post:
properties:
file:
contentMediaType: application/octet-stream
title: File
type: string
required:
- file
title: Body_upload_user_file_api_v2_files_post
type: object
CancelFlowResponse:
description: Response model for flow build cancellation.
properties:
message:
title: Message
type: string
success:
title: Success
type: boolean
required:
- success
- message
title: CancelFlowResponse
type: object
ChatOutputResponse:
description: Chat output response schema.
properties:
component_id:
anyOf:
- type: string
- type: 'null'
title: Component Id
files:
default: []
items:
$ref: '#/components/schemas/lfx__utils__schemas__File'
title: Files
type: array
message:
anyOf:
- type: string
- items:
anyOf:
- type: string
- additionalProperties: true
type: object
type: array
title: Message
sender:
anyOf:
- type: string
- type: 'null'
default: Machine
title: Sender
sender_name:
anyOf:
- type: string
- type: 'null'
default: AI
title: Sender Name
session_id:
anyOf:
- type: string
- type: 'null'
title: Session Id
stream_url:
anyOf:
- type: string
- type: 'null'
title: Stream Url
type:
title: Type
type: string
required:
- message
- type
title: ChatOutputResponse
type: object
CodeContent:
additionalProperties: true
type: object
ComponentOutput:
description: Component output schema.
properties:
content:
anyOf:
- {}
- type: 'null'
title: Content
metadata:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
title: Metadata
status:
$ref: '#/$defs/JobStatus'
type:
description: Type of the component output (e.g., 'message', 'data', 'tool', 'text')
title: Type
type: string
required:
- type
- status
title: ComponentOutput
type: object
ComposerUrlResponse:
description: Response model for MCP Composer connection details.
properties:
error_message:
anyOf:
- type: string
- type: 'null'
title: Error Message
legacy_sse_url:
anyOf:
- type: string
- type: 'null'
title: Legacy Sse Url
project_id:
title: Project Id
type: string
streamable_http_url:
anyOf:
- type: string
- type: 'null'
title: Streamable Http Url
uses_composer:
title: Uses Composer
type: boolean
required:
- project_id
- uses_composer
title: ComposerUrlResponse
type: object
ConfigResponse:
description: 'Full configuration response for authenticated users.
The ''type'' field is a discriminator to distinguish from PublicConfigResponse.'
properties:
allow_custom_components:
title: Allow Custom Components
type: boolean
auto_saving:
title: Auto Saving
type: boolean
auto_saving_interval:
title: Auto Saving Interval
type: integer
default_folder_name:
title: Default Folder Name
type: string
event_delivery:
enum:
- polling
- streaming
- direct
title: Event Delivery
type: string
feature_flags:
$ref: '#/components/schemas/FeatureFlags'
frontend_timeout:
title: Frontend Timeout
type: integer
health_check_max_retries:
title: Health Check Max Retries
type: integer
hide_getting_started_progress:
title: Hide Getting Started Progress
type: boolean
max_file_size_upload:
title: Max File Size Upload
type: integer
mcp_base_url:
title: Mcp Base Url
type: string
public_flow_cleanup_interval:
title: Public Flow Cleanup Interval
type: integer
public_flow_expiration:
title: Public Flow Expiration
type: integer
serialization_max_items_length:
title: Serialization Max Items Length
type: integer
serialization_max_text_length:
title: Serialization Max Text Length
type: integer
type:
const: full
default: full
title: Type
type: string
voice_mode_available:
title: Voice Mode Available
type: boolean
webhook_auth_enable:
title: Webhook Auth Enable
type: boolean
webhook_polling_interval:
title: Webhook Polling Interval
type: integer
required:
- feature_flags
- max_file_size_upload
- event_delivery
- voice_mode_available
- frontend_timeout
- mcp_base_url
- serialization_max_items_length
- serialization_max_text_length
- auto_saving
- auto_saving_interval
- health_check_max_retries
- webhook_polling_interval
- public_flow_cleanup_interval
- public_flow_expiration
- webhook_auth_enable
- default_folder_name
- hide_getting_started_progress
- allow_custom_components
title: ConfigResponse
type: object
ContentBlock:
description: A block of content that can contain different types of content.
properties:
allow_markdown:
default: true
title: Allow Markdown
type: boolean
contents:
items:
additionalProperties: true
type: object
title: Contents
type: array
media_url:
anyOf:
- items:
type: string
type: array
- type: 'null'
title: Media Url
title:
title: Title
type: string
required:
- title
- contents
title: ContentBlock
type: object
ErrorContent:
additionalProperties: true
type: object
ErrorDetail:
description: Error detail schema.
properties:
code:
anyOf:
- type: string
- type: 'null'
title: Code
details:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
title: Details
error:
title: Error
type: string
required:
- error
title: ErrorDetail
type: object
EventDeliveryType:
enum:
- streaming
- direct
- polling
title: EventDeliveryType
type: string
FeatureFlags:
additionalProperties: false
properties:
mvp_components:
default: false
title: Mvp Components
type: boolean
wxo_deployments:
default: false
title: Wxo Deployments
type: boolean
title: FeatureFlags
type: object
FlowCreate:
properties:
access_type:
$ref: '#/components/schemas/AccessTypeEnum'
default: PRIVATE
action_description:
anyOf:
- type: string
- type: 'null'
description: The description of the action associated with the flow
title: Action Description
action_name:
anyOf:
- type: string
- type: 'null'
description: The name of the action associated with the flow
title: Action Name
data:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
title: Data
description:
anyOf:
- type: string
- type: 'null'
title: Description
endpoint_name:
anyOf:
- type: string
- type: 'null'
title: Endpoint Name
folder_id:
anyOf:
- format: uuid
type: string
- type: 'null'
title: Folder Id
fs_path:
anyOf:
- type: string
- type: 'null'
title: Fs Path
gradient:
anyOf:
- type: string
- type: 'null'
title: Gradient
icon:
anyOf:
- type: string
- type: 'null'
title: Icon
icon_bg_color:
anyOf:
- type: string
- type: 'null'
title: Icon Bg Color
id:
anyOf:
- format: uuid
type: string
- type: 'null'
title: Id
is_component:
anyOf:
- type: boolean
- type: 'null'
default: false
title: Is Component
locked:
anyOf:
- type: boolean
- type: 'null'
default: false
title: Locked
mcp_enabled:
anyOf:
- type: boolean
- type: 'null'
default: false
description: Can be exposed in the MCP server
title: Mcp Enabled
name:
title: Name
type: string
tags:
anyOf:
- items:
type: string
type: array
- type: 'null'
title: Tags
updated_at:
anyOf:
- format: date-time
type: string
- type: 'null'
title: Updated At
user_id:
anyOf:
- format: uuid
type: string
- type: 'null'
title: User Id
webhook:
anyOf:
- type: boolean
- type: 'null'
default: false
description: Can be used on the webhook endpoint
title: Webhook
required:
- name
title: FlowCreate
type: object
FlowDataRequest:
properties:
edges:
items:
additionalProperties: true
type: object
title: Edges
type: array
nodes:
items:
additionalProperties: true
type: object
title: Nodes
type: array
viewport:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
title: Viewport
required:
- nodes
- edges
title: FlowDataRequest
type: object
FlowEventCreate:
properties:
summary:
default: ''
maxLength: 500
title: Summary
type: string
type:
enum:
- component_added
- component_removed
- component_configured
- connection_added
- connection_removed
- flow_updated
- flow_settled
title: Type
type: string
required:
- type
title: FlowEventCreate
type: object
FlowEventResponse:
properties:
summary:
title: Summary
type: string
timestamp:
title: Timestamp
type: number
type:
title: Type
type: string
required:
- type
- timestamp
- summary
title: FlowEventResponse
type: object
FlowEventsResponse:
properties:
events:
items:
$ref: '#/components/schemas/FlowEventResponse'
title: Events
type: array
settled:
title: Settled
type: boolean
required:
- events
- settled
title: FlowEventsResponse
type: object
FlowHeader:
description: Model representing a header for a flow - Without the data.
properties:
access_type:
anyOf:
- $ref: '#/components/schemas/AccessTypeEnum'
- type: 'null'
description: The access type of the flow
action_description:
anyOf:
- type: string
- type: 'null'
description: The description of the action associated with the flow
title: Action Description
action_name:
anyOf:
- type: string
- type: 'null'
description: The name of the action associated with the flow
title: Action Name
data:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
description: The data of the component, if is_component is True
title: Data
description:
anyOf:
- type: string
- type: 'null'
description: A description of the flow
title: Description
endpoint_name:
anyOf:
- type: string
- type: 'null'
description: The name of the endpoint associated with this flow
title: Endpoint Name
folder_id:
anyOf:
- format: uuid
type: string
- type: 'null'
description: The ID of the folder containing the flow. None if not associated with a folder
title: Folder Id
id:
description: Unique identifier for the flow
format: uuid
title: Id
type: string
is_component:
anyOf:
- type: boolean
- type: 'null'
description: Flag indicating whether the flow is a component
title: Is Component
mcp_enabled:
anyOf:
- type: boolean
- type: 'null'
description: Flag indicating whether the flow is exposed in the MCP server
title: Mcp Enabled
name:
description: The name of the flow
title: Name
type: string
tags:
anyOf:
- items:
type: string
type: array
- type: 'null'
description: The tags of the flow
title: Tags
required:
- id
- name
title: FlowHeader
type: object
FlowListCreate:
properties:
flows:
items:
$ref: '#/components/schemas/FlowCreate'
title: Flows
type: array
required:
- flows
title: FlowListCreate
type: object
FlowRead:
properties:
access_type:
$ref: '#/components/schemas/AccessTypeEnum'
default: PRIVATE
action_description:
anyOf:
- type: string
- type: 'null'
description: The description of the action associated with the flow
title: Action Description
action_name:
anyOf:
- type: string
- type: 'null'
description: The name of the action associated with the flow
title: Action Name
data:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
title: Data
description:
anyOf:
- type: string
- type: 'null'
title: Description
endpoint_name:
anyOf:
- type: string
- type: 'null'
title: Endpoint Name
folder_id:
anyOf:
- format: uuid
type: string
- type: 'null'
title: Folder Id
gradient:
anyOf:
- type: string
- type: 'null'
title: Gradient
icon:
anyOf:
- type: string
- type: 'null'
title: Icon
icon_bg_color:
anyOf:
- type: string
- type: 'null'
title: Icon Bg Color
id:
format: uuid
title: Id
type: string
is_component:
anyOf:
- type: boolean
- type: 'null'
default: false
title: Is Component
locked:
anyOf:
- type: boolean
- type: 'null'
default: false
title: Locked
mcp_enabled:
anyOf:
- type: boolean
- type: 'null'
default: false
description: Can be exposed in the MCP server
title: Mcp Enabled
name:
title: Name
type: string
tags:
anyOf:
- items:
type: string
type: array
- type: 'null'
description: The tags of the flow
title: Tags
updated_at:
anyOf:
- format: date-time
type: string
- type: 'null'
title: Updated At
user_id:
anyOf:
- format: uuid
type: string
- type: 'null'
title: User Id
webhook:
anyOf:
- type: boolean
- type: 'null'
default: false
description: Can be used on the webhook endpoint
title: Webhook
required:
- name
- id
- user_id
- folder_id
title: FlowRead
type: object
FlowUpdate:
properties:
access_type:
anyOf:
- $ref: '#/components/schemas/AccessTypeEnum'
- type: 'null'
action_description:
anyOf:
- type: string
- type: 'null'
title: Action Description
action_name:
anyOf:
- type: string
- type: 'null'
title: Action Name
data:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
title: Data
description:
anyOf:
- type: string
- type: 'null'
title: Description
endpoint_name:
anyOf:
- type: string
- type: 'null'
title: Endpoint Name
folder_id:
anyOf:
- format: uuid
type: string
- type: 'null'
title: Folder Id
fs_path:
anyOf:
- type: string
- type: 'null'
title: Fs Path
locked:
anyOf:
- type: boolean
- type: 'null'
title: Locked
mcp_enabled:
anyOf:
- type: boolean
- type: 'null'
title: Mcp Enabled
name:
anyOf:
- type: string
- type: 'null'
title: Name
title: FlowUpdate
type: object
FolderCreate:
properties:
auth_settings:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
description: Authentication settings for the folder/project
title: Auth Settings
components_list:
anyOf:
- items:
format: uuid
type: string
type: array
- type: 'null'
title: Components List
description:
anyOf:
- type: string
- type: 'null'
title: Description
flows_list:
anyOf:
- items:
format: uuid
type: string
type: array
- type: 'null'
title: Flows List
name:
title: Name
type: string
required:
- name
title: FolderCreate
type: object
FolderRead:
properties:
auth_settings:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
description: Authentication settings for the folder/project
title: Auth Settings
description:
anyOf:
- type: string
- type: 'null'
title: Description
id:
format: uuid
title: Id
type: string
name:
title: Name
type: string
parent_id:
anyOf:
- format: uuid
type: string
- type: 'null'
title: Parent Id
required:
- name
- id
- parent_id
title: FolderRead
type: object
FolderReadWithFlows:
properties:
auth_settings:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
description: Authentication settings for the folder/project
title: Auth Settings
description:
anyOf:
- type: string
- type: 'null'
title: Description
flows:
default: []
items:
$ref: '#/components/schemas/FlowRead'
title: Flows
type: array
id:
format: uuid
title: Id
type: string
name:
title: Name
type: string
parent_id:
anyOf:
- format: uuid
type: string
- type: 'null'
title: Parent Id
required:
- name
- id
- parent_id
title: FolderReadWithFlows
type: object
FolderUpdate:
properties:
auth_settings:
anyOf:
- additionalProperties: true
type: object
- type: 'null'
title: Auth Settings
components:
items:
format: uuid
type: string
title: Components
type: array
description:
anyOf:
- type: string
- type: 'null'
title: Description
flows:
items:
format: uuid
type: string
title: Flows
type: array
name:
anyOf:
- type: string
- type: 'null'
title: Name
parent_id:
anyOf:
- format: uuid
type: string
- type: 'null'
title: Parent Id
title: FolderUpdate
type: object
FolderWithPaginatedFlows:
properties:
flows:
$ref: '#/components/schemas/Page_FlowRead_'
folder:
$ref: '#/components/schemas/FolderRead'
required:
- folder
- flows
title: FolderWithPaginatedFlows
type: object
GraphData:
properties:
edges:
items:
additionalProperties: true
type: object
title: Edges
type: array
nodes:
items:
additionalProperties: true
type: object
title: Nodes
type: array
viewport:
anyOf:
- $ref: '#/components/schemas/ViewPort'
- type: 'null'
required:
- nodes
- edges
title: GraphData
type: object
GraphDumpResponse:
properties:
data:
$ref: '#/components/schemas/GraphData'
description:
anyOf:
- type: string
- type: 'null'
title: Description
endpoint_name:
anyOf:
- type: string
- type: 'null'
title: Endpoint Name
is_component:
anyOf:
- type: boolean
- type: 'null'
title: Is Component
name:
anyOf:
- type: string
- type: 'null'
title: Name
required:
- data
title: GraphDumpResponse
type: object
HTTPValidationError:
properties:
detail:
items:
$ref: '#/components/schemas/ValidationError'
title: Detail
type: array
title: HTTPValidationError
type: object
HealthResponse:
properties:
chat:
default: error check the server logs
title: Chat
type: string
db:
default: error check the server logs
title: Db
type: string
status:
default: nok
title: Status
type: string
title: HealthResponse
type: object
InputValueRequest:
additionalProperties: false
examples:
- components:
- components_id
- Component Name
input_value: input_value
session: session_id
- components:
- Component Name
input_value: input_value
- input_value: input_value
- components:
- Component Name
input_value: input_value
session: session_id
- input_value: input_value
session: session_id
- input_value: input_value
type: chat
- input_value: '{"key": "value"}'
type: json
properties:
client_request_time:
anyOf:
- type: integer
- type: 'null'
description: Client-side timestamp in milliseconds when the request was initiated. Used to calculate accurate end-to-end
duration.
title: Client Request Time
components:
anyOf:
- items:
type: string
type: array
- type: 'null'
default: []
title: Components
input_value:
anyOf:
- type: string
- type: 'null'
title: Input Value
session:
anyOf:
- type: string
- type: 'null'
title: Session
type:
anyOf:
- enum:
- chat
- text
- any
type: string
- type: 'null'
default: any
description: Defines on which components the input value should be applied. 'any' applies to all input components.
title: Type
title: InputValueRequest
type: object
JSONContent:
additionalProperties: true
type: object
JobStatus:
description: Job execution status.
enum:
- queued
- in_progress
- completed
- failed
- cancelled
- timed_out
title: JobStatus
type: string
MCPInstallRequest:
properties:
client:
title: Client
type: string
transport:
anyOf:
- enum:
- sse
- streamablehttp
type: string
- type: 'null'
title: Transport
required:
- client
title: MCPInstallRequest
type: object
MCPProjectUpdateRequest:
description: Request model for updating MCP project settings including auth.
properties:
auth_settings:
anyOf:
- $ref: '#/components/schemas/AuthSettings'
- type: 'null'
settings:
items:
$ref: '#/components/schemas/MCPSettings'
title: Settings
type: array
required:
- settings
title: MCPProjectUpdateRequest
type: object
MCPServerConfig:
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