diff --git a/invokeai/app/api/dependencies.py b/invokeai/app/api/dependencies.py
index 5698d25758..cd5d8a61b2 100644
--- a/invokeai/app/api/dependencies.py
+++ b/invokeai/app/api/dependencies.py
@@ -3,12 +3,14 @@
 import os
 from argparse import Namespace
 
+from ..services.default_graphs import create_system_graphs
+
 from ..services.latent_storage import DiskLatentsStorage, ForwardCacheLatentsStorage
 
 from ...backend import Globals
 from ..services.model_manager_initializer import get_model_manager
 from ..services.restoration_services import RestorationServices
-from ..services.graph import GraphExecutionState
+from ..services.graph import GraphExecutionState, LibraryGraph
 from ..services.image_storage import DiskImageStorage
 from ..services.invocation_queue import MemoryInvocationQueue
 from ..services.invocation_services import InvocationServices
@@ -69,6 +71,9 @@ class ApiDependencies:
             latents=latents,
             images=images,
             queue=MemoryInvocationQueue(),
+            graph_library=SqliteItemStorage[LibraryGraph](
+                filename=db_location, table_name="graphs"
+            ),
             graph_execution_manager=SqliteItemStorage[GraphExecutionState](
                 filename=db_location, table_name="graph_executions"
             ),
@@ -76,6 +81,8 @@ class ApiDependencies:
             restoration=RestorationServices(config),
         )
 
+        create_system_graphs(services.graph_library)
+
         ApiDependencies.invoker = Invoker(services)
 
     @staticmethod
diff --git a/invokeai/app/cli/commands.py b/invokeai/app/cli/commands.py
index 4e9c9aa581..5ad4827eb0 100644
--- a/invokeai/app/cli/commands.py
+++ b/invokeai/app/cli/commands.py
@@ -7,11 +7,40 @@ from pydantic import BaseModel, Field
 import networkx as nx
 import matplotlib.pyplot as plt
 
-from ..models.image import ImageField
-from ..services.graph import GraphExecutionState
+from ..invocations.baseinvocation import BaseInvocation
+from ..invocations.image import ImageField
+from ..services.graph import GraphExecutionState, LibraryGraph, GraphInvocation, Edge
 from ..services.invoker import Invoker
 
 
+def add_field_argument(command_parser, name: str, field, default_override = None):
+    default = default_override if default_override is not None else field.default if field.default_factory is None else field.default_factory()
+    if get_origin(field.type_) == Literal:
+        allowed_values = get_args(field.type_)
+        allowed_types = set()
+        for val in allowed_values:
+            allowed_types.add(type(val))
+        allowed_types_list = list(allowed_types)
+        field_type = allowed_types_list[0] if len(allowed_types) == 1 else Union[allowed_types_list]  # type: ignore
+
+        command_parser.add_argument(
+            f"--{name}",
+            dest=name,
+            type=field_type,
+            default=default,
+            choices=allowed_values,
+            help=field.field_info.description,
+        )
+    else:
+        command_parser.add_argument(
+            f"--{name}",
+            dest=name,
+            type=field.type_,
+            default=default,
+            help=field.field_info.description,
+        )
+
+
 def add_parsers(
     subparsers,
     commands: list[type],
@@ -36,30 +65,26 @@ def add_parsers(
             if name in exclude_fields:
                 continue
 
-            if get_origin(field.type_) == Literal:
-                allowed_values = get_args(field.type_)
-                allowed_types = set()
-                for val in allowed_values:
-                    allowed_types.add(type(val))
-                allowed_types_list = list(allowed_types)
-                field_type = allowed_types_list[0] if len(allowed_types) == 1 else Union[allowed_types_list]  # type: ignore
+            add_field_argument(command_parser, name, field)
 
-                command_parser.add_argument(
-                    f"--{name}",
-                    dest=name,
-                    type=field_type,
-                    default=field.default if field.default_factory is None else field.default_factory(),
-                    choices=allowed_values,
-                    help=field.field_info.description,
-                )
-            else:
-                command_parser.add_argument(
-                    f"--{name}",
-                    dest=name,
-                    type=field.type_,
-                    default=field.default if field.default_factory is None else field.default_factory(),
-                    help=field.field_info.description,
-                )
+
+def add_graph_parsers(
+    subparsers,
+    graphs: list[LibraryGraph],
+    add_arguments: Callable[[argparse.ArgumentParser], None]|None = None
+):
+    for graph in graphs:
+        command_parser = subparsers.add_parser(graph.name, help=graph.description)
+        
+        if add_arguments is not None:
+            add_arguments(command_parser)
+
+        # Add arguments for inputs
+        for exposed_input in graph.exposed_inputs:
+            node = graph.graph.get_node(exposed_input.node_path)
+            field = node.__fields__[exposed_input.field]
+            default_override = getattr(node, exposed_input.field)
+            add_field_argument(command_parser, exposed_input.alias, field, default_override)
 
 
 class CliContext:
@@ -67,17 +92,38 @@ class CliContext:
     session: GraphExecutionState
     parser: argparse.ArgumentParser
     defaults: dict[str, Any]
+    graph_nodes: dict[str, str]
+    nodes_added: list[str]
 
     def __init__(self, invoker: Invoker, session: GraphExecutionState, parser: argparse.ArgumentParser):
         self.invoker = invoker
         self.session = session
         self.parser = parser
         self.defaults = dict()
+        self.graph_nodes = dict()
+        self.nodes_added = list()
 
     def get_session(self):
         self.session = self.invoker.services.graph_execution_manager.get(self.session.id)
         return self.session
 
+    def reset(self):
+        self.session = self.invoker.create_execution_state()
+        self.graph_nodes = dict()
+        self.nodes_added = list()
+        # Leave defaults unchanged
+
+    def add_node(self, node: BaseInvocation):
+        self.get_session()
+        self.session.graph.add_node(node)
+        self.nodes_added.append(node.id)
+        self.invoker.services.graph_execution_manager.set(self.session)
+
+    def add_edge(self, edge: Edge):
+        self.get_session()
+        self.session.add_edge(edge)
+        self.invoker.services.graph_execution_manager.set(self.session)
+
 
 class ExitCli(Exception):
     """Exception to exit the CLI"""
diff --git a/invokeai/app/cli_app.py b/invokeai/app/cli_app.py
index a257825dcc..86fd18ca60 100644
--- a/invokeai/app/cli_app.py
+++ b/invokeai/app/cli_app.py
@@ -13,17 +13,20 @@ from typing import (
 from pydantic import BaseModel
 from pydantic.fields import Field
 
+from .services.default_graphs import create_system_graphs
+
 from .services.latent_storage import DiskLatentsStorage, ForwardCacheLatentsStorage
 
 from ..backend import Args
-from .cli.commands import BaseCommand, CliContext, ExitCli, add_parsers, get_graph_execution_history
+from .cli.commands import BaseCommand, CliContext, ExitCli, add_graph_parsers, add_parsers, get_graph_execution_history
 from .cli.completer import set_autocompleter
 from .invocations import *
 from .invocations.baseinvocation import BaseInvocation
 from .services.events import EventServiceBase
 from .services.model_manager_initializer import get_model_manager
 from .services.restoration_services import RestorationServices
-from .services.graph import Edge, EdgeConnection, GraphExecutionState, are_connection_types_compatible
+from .services.graph import Edge, EdgeConnection, ExposedNodeInput, GraphExecutionState, GraphInvocation, LibraryGraph, are_connection_types_compatible
+from .services.default_graphs import default_text_to_image_graph_id
 from .services.image_storage import DiskImageStorage
 from .services.invocation_queue import MemoryInvocationQueue
 from .services.invocation_services import InvocationServices
@@ -58,7 +61,7 @@ def add_invocation_args(command_parser):
     )
 
 
-def get_command_parser() -> argparse.ArgumentParser:
+def get_command_parser(services: InvocationServices) -> argparse.ArgumentParser:
     # Create invocation parser
     parser = argparse.ArgumentParser()
 
@@ -76,20 +79,72 @@ def get_command_parser() -> argparse.ArgumentParser:
     commands = BaseCommand.get_all_subclasses()
     add_parsers(subparsers, commands, exclude_fields=["type"])
 
+    # Create subparsers for exposed CLI graphs
+    # TODO: add a way to identify these graphs
+    text_to_image = services.graph_library.get(default_text_to_image_graph_id)
+    add_graph_parsers(subparsers, [text_to_image], add_arguments=add_invocation_args)
+
     return parser
 
 
+class NodeField():
+    alias: str
+    node_path: str
+    field: str
+    field_type: type
+
+    def __init__(self, alias: str, node_path: str, field: str, field_type: type):
+        self.alias = alias
+        self.node_path = node_path
+        self.field = field
+        self.field_type = field_type
+
+
+def fields_from_type_hints(hints: dict[str, type], node_path: str) -> dict[str,NodeField]:
+    return {k:NodeField(alias=k, node_path=node_path, field=k, field_type=v) for k, v in hints.items()}
+
+
+def get_node_input_field(graph: LibraryGraph, field_alias: str, node_id: str) -> NodeField:
+    """Gets the node field for the specified field alias"""
+    exposed_input = next(e for e in graph.exposed_inputs if e.alias == field_alias)
+    node_type = type(graph.graph.get_node(exposed_input.node_path))
+    return NodeField(alias=exposed_input.alias, node_path=f'{node_id}.{exposed_input.node_path}', field=exposed_input.field, field_type=get_type_hints(node_type)[exposed_input.field])
+
+
+def get_node_output_field(graph: LibraryGraph, field_alias: str, node_id: str) -> NodeField:
+    """Gets the node field for the specified field alias"""
+    exposed_output = next(e for e in graph.exposed_outputs if e.alias == field_alias)
+    node_type = type(graph.graph.get_node(exposed_output.node_path))
+    node_output_type = node_type.get_output_type()
+    return NodeField(alias=exposed_output.alias, node_path=f'{node_id}.{exposed_output.node_path}', field=exposed_output.field, field_type=get_type_hints(node_output_type)[exposed_output.field])
+
+
+def get_node_inputs(invocation: BaseInvocation, context: CliContext) -> dict[str, NodeField]:
+    """Gets the inputs for the specified invocation from the context"""
+    node_type = type(invocation)
+    if node_type is not GraphInvocation:
+        return fields_from_type_hints(get_type_hints(node_type), invocation.id)
+    else:
+        graph: LibraryGraph = context.invoker.services.graph_library.get(context.graph_nodes[invocation.id])
+        return {e.alias: get_node_input_field(graph, e.alias, invocation.id) for e in graph.exposed_inputs}
+
+
+def get_node_outputs(invocation: BaseInvocation, context: CliContext) -> dict[str, NodeField]:
+    """Gets the outputs for the specified invocation from the context"""
+    node_type = type(invocation)
+    if node_type is not GraphInvocation:
+        return fields_from_type_hints(get_type_hints(node_type.get_output_type()), invocation.id)
+    else:
+        graph: LibraryGraph = context.invoker.services.graph_library.get(context.graph_nodes[invocation.id])
+        return {e.alias: get_node_output_field(graph, e.alias, invocation.id) for e in graph.exposed_outputs}
+
+
 def generate_matching_edges(
-    a: BaseInvocation, b: BaseInvocation
+    a: BaseInvocation, b: BaseInvocation, context: CliContext
 ) -> list[Edge]:
     """Generates all possible edges between two invocations"""
-    atype = type(a)
-    btype = type(b)
-
-    aoutputtype = atype.get_output_type()
-
-    afields = get_type_hints(aoutputtype)
-    bfields = get_type_hints(btype)
+    afields = get_node_outputs(a, context)
+    bfields = get_node_inputs(b, context)
 
     matching_fields = set(afields.keys()).intersection(bfields.keys())
 
@@ -98,14 +153,14 @@ def generate_matching_edges(
     matching_fields = matching_fields.difference(invalid_fields)
 
     # Validate types
-    matching_fields = [f for f in matching_fields if are_connection_types_compatible(afields[f], bfields[f])]
+    matching_fields = [f for f in matching_fields if are_connection_types_compatible(afields[f].field_type, bfields[f].field_type)]
 
     edges = [
         Edge(
-            source=EdgeConnection(node_id=a.id, field=field),
-            destination=EdgeConnection(node_id=b.id, field=field)
+            source=EdgeConnection(node_id=afields[alias].node_path, field=afields[alias].field),
+            destination=EdgeConnection(node_id=bfields[alias].node_path, field=bfields[alias].field)
         )
-        for field in matching_fields
+        for alias in matching_fields
     ]
     return edges
 
@@ -158,6 +213,9 @@ def invoke_cli():
         latents = ForwardCacheLatentsStorage(DiskLatentsStorage(f'{output_folder}/latents')),
         images=DiskImageStorage(f'{output_folder}/images'),
         queue=MemoryInvocationQueue(),
+        graph_library=SqliteItemStorage[LibraryGraph](
+            filename=db_location, table_name="graphs"
+        ),
         graph_execution_manager=SqliteItemStorage[GraphExecutionState](
             filename=db_location, table_name="graph_executions"
         ),
@@ -165,9 +223,12 @@ def invoke_cli():
         restoration=RestorationServices(config),
     )
 
+    system_graphs = create_system_graphs(services.graph_library)
+    system_graph_names = set([g.name for g in system_graphs])
+
     invoker = Invoker(services)
     session: GraphExecutionState = invoker.create_execution_state()
-    parser = get_command_parser()
+    parser = get_command_parser(services)
 
     re_negid = re.compile('^-[0-9]+$')
 
@@ -185,11 +246,12 @@ def invoke_cli():
 
         try:
             # Refresh the state of the session
-            history = list(get_graph_execution_history(context.session))
+            #history = list(get_graph_execution_history(context.session))
+            history = list(reversed(context.nodes_added))
 
             # Split the command for piping
             cmds = cmd_input.split("|")
-            start_id = len(history)
+            start_id = len(context.nodes_added)
             current_id = start_id
             new_invocations = list()
             for cmd in cmds:
@@ -205,8 +267,24 @@ def invoke_cli():
                         args[field_name] = field_default
 
                 # Parse invocation
-                args["id"] = current_id
-                command = CliCommand(command=args)
+                command: CliCommand = None # type:ignore
+                system_graph: LibraryGraph|None = None
+                if args['type'] in system_graph_names:
+                    system_graph = next(filter(lambda g: g.name == args['type'], system_graphs))
+                    invocation = GraphInvocation(graph=system_graph.graph, id=str(current_id))
+                    for exposed_input in system_graph.exposed_inputs:
+                        if exposed_input.alias in args:
+                            node = invocation.graph.get_node(exposed_input.node_path)
+                            field = exposed_input.field
+                            setattr(node, field, args[exposed_input.alias])
+                    command = CliCommand(command = invocation)
+                    context.graph_nodes[invocation.id] = system_graph.id
+                else:
+                    args["id"] = current_id
+                    command = CliCommand(command=args)
+
+                if command is None:
+                    continue
 
                 # Run any CLI commands immediately
                 if isinstance(command.command, BaseCommand):
@@ -217,6 +295,7 @@ def invoke_cli():
                     command.command.run(context)
                     continue
 
+                # TODO: handle linking with library graphs
                 # Pipe previous command output (if there was a previous command)
                 edges: list[Edge] = list()
                 if len(history) > 0 or current_id != start_id:
@@ -229,7 +308,7 @@ def invoke_cli():
                         else context.session.graph.get_node(from_id)
                     )
                     matching_edges = generate_matching_edges(
-                        from_node, command.command
+                        from_node, command.command, context
                     )
                     edges.extend(matching_edges)
 
@@ -242,7 +321,7 @@ def invoke_cli():
 
                         link_node = context.session.graph.get_node(node_id)
                         matching_edges = generate_matching_edges(
-                            link_node, command.command
+                            link_node, command.command, context
                         )
                         matching_destinations = [e.destination for e in matching_edges]
                         edges = [e for e in edges if e.destination not in matching_destinations]
@@ -256,12 +335,14 @@ def invoke_cli():
                         if re_negid.match(node_id):
                             node_id = str(current_id + int(node_id))
 
+                        # TODO: handle missing input/output
+                        node_output = get_node_outputs(context.session.graph.get_node(node_id), context)[link[1]]
+                        node_input = get_node_inputs(command.command, context)[link[2]]
+
                         edges.append(
                             Edge(
-                                source=EdgeConnection(node_id=node_id, field=link[1]),
-                                destination=EdgeConnection(
-                                    node_id=command.command.id, field=link[2]
-                                )
+                                source=EdgeConnection(node_id=node_output.node_path, field=node_output.field),
+                                destination=EdgeConnection(node_id=node_input.node_path, field=node_input.field)
                             )
                         )
 
@@ -270,10 +351,10 @@ def invoke_cli():
                 current_id = current_id + 1
 
                 # Add the node to the session
-                context.session.add_node(command.command)
+                context.add_node(command.command)
                 for edge in edges:
                     print(edge)
-                    context.session.add_edge(edge)
+                    context.add_edge(edge)
 
             # Execute all remaining nodes
             invoke_all(context)
@@ -285,7 +366,7 @@ def invoke_cli():
         except SessionError:
             # Start a new session
             print("Session error: creating a new session")
-            context.session = context.invoker.create_execution_state()
+            context.reset()
 
         except ExitCli:
             break
diff --git a/invokeai/app/invocations/latent.py b/invokeai/app/invocations/latent.py
index 2da6e451a9..ef17962f89 100644
--- a/invokeai/app/invocations/latent.py
+++ b/invokeai/app/invocations/latent.py
@@ -1,5 +1,6 @@
 # Copyright (c) 2023 Kyle Schouviller (https://github.com/kyle0654)
 
+import random
 from typing import Literal, Optional
 from pydantic import BaseModel, Field
 import torch
@@ -99,13 +100,17 @@ def get_noise(width:int, height:int, device:torch.device, seed:int = 0, latent_c
     return x
 
 
+def random_seed():
+    return random.randint(0, np.iinfo(np.uint32).max)
+
+
 class NoiseInvocation(BaseInvocation):
     """Generates latent noise."""
 
     type: Literal["noise"] = "noise"
 
     # Inputs
-    seed:        int = Field(default=0, ge=0, le=np.iinfo(np.uint32).max, description="The seed to use", )
+    seed:        int = Field(ge=0, le=np.iinfo(np.uint32).max, description="The seed to use", default_factory=random_seed)
     width:       int = Field(default=512, multiple_of=64, gt=0, description="The width of the resulting noise", )
     height:      int = Field(default=512, multiple_of=64, gt=0, description="The height of the resulting noise", )
 
@@ -313,6 +318,56 @@ class LatentsToLatentsInvocation(TextToLatentsInvocation):
         )
 
 
+class LatentsToLatentsInvocation(TextToLatentsInvocation):
+    """Generates latents using latents as base image."""
+
+    type: Literal["l2l"] = "l2l"
+
+    # Inputs
+    latents: Optional[LatentsField] = Field(description="The latents to use as a base image")
+    strength: float = Field(default=0.5, description="The strength of the latents to use")
+
+    def invoke(self, context: InvocationContext) -> LatentsOutput:
+        noise = context.services.latents.get(self.noise.latents_name)
+        latent = context.services.latents.get(self.latents.latents_name)
+
+        def step_callback(state: PipelineIntermediateState):
+            self.dispatch_progress(context, state)
+
+        model = self.get_model(context.services.model_manager)
+        conditioning_data = self.get_conditioning_data(model)
+
+        # TODO: Verify the noise is the right size
+
+        initial_latents = latent if self.strength < 1.0 else torch.zeros_like(
+            latent, device=model.device, dtype=latent.dtype
+        )
+        
+        timesteps, _ = model.get_img2img_timesteps(
+            self.steps,
+            self.strength,
+            device=model.device,
+        )
+
+        result_latents, result_attention_map_saver = model.latents_from_embeddings(
+            latents=initial_latents,
+            timesteps=timesteps,
+            noise=noise,
+            num_inference_steps=self.steps,
+            conditioning_data=conditioning_data,
+            callback=step_callback
+        )
+
+        # https://discuss.huggingface.co/t/memory-usage-by-later-pipeline-stages/23699
+        torch.cuda.empty_cache()
+
+        name = f'{context.graph_execution_state_id}__{self.id}'
+        context.services.latents.set(name, result_latents)
+        return LatentsOutput(
+            latents=LatentsField(latents_name=name)
+        )
+
+
 # Latent to image
 class LatentsToImageInvocation(BaseInvocation):
     """Generates an image from latents."""
diff --git a/invokeai/app/invocations/params.py b/invokeai/app/invocations/params.py
new file mode 100644
index 0000000000..fcc7f1737a
--- /dev/null
+++ b/invokeai/app/invocations/params.py
@@ -0,0 +1,18 @@
+# Copyright (c) 2023 Kyle Schouviller (https://github.com/kyle0654)
+
+from typing import Literal
+from pydantic import Field
+from .baseinvocation import BaseInvocation, BaseInvocationOutput, InvocationContext
+from .math import IntOutput
+
+# Pass-through parameter nodes - used by subgraphs
+
+class ParamIntInvocation(BaseInvocation):
+    """An integer parameter"""
+    #fmt: off
+    type: Literal["param_int"] = "param_int"
+    a: int = Field(default=0, description="The integer value")
+    #fmt: on
+
+    def invoke(self, context: InvocationContext) -> IntOutput:
+        return IntOutput(a=self.a)
diff --git a/invokeai/app/services/default_graphs.py b/invokeai/app/services/default_graphs.py
new file mode 100644
index 0000000000..637d906e75
--- /dev/null
+++ b/invokeai/app/services/default_graphs.py
@@ -0,0 +1,56 @@
+from ..invocations.latent import LatentsToImageInvocation, NoiseInvocation, TextToLatentsInvocation
+from ..invocations.params import ParamIntInvocation
+from .graph import Edge, EdgeConnection, ExposedNodeInput, ExposedNodeOutput, Graph, LibraryGraph
+from .item_storage import ItemStorageABC
+
+
+default_text_to_image_graph_id = '539b2af5-2b4d-4d8c-8071-e54a3255fc74'
+
+
+def create_text_to_image() -> LibraryGraph:
+    return LibraryGraph(
+        id=default_text_to_image_graph_id,
+        name='t2i',
+        description='Converts text to an image',
+        graph=Graph(
+            nodes={
+                'width': ParamIntInvocation(id='width', a=512),
+                'height': ParamIntInvocation(id='height', a=512),
+                '3': NoiseInvocation(id='3'),
+                '4': TextToLatentsInvocation(id='4'),
+                '5': LatentsToImageInvocation(id='5')
+            },
+            edges=[
+                Edge(source=EdgeConnection(node_id='width', field='a'), destination=EdgeConnection(node_id='3', field='width')),
+                Edge(source=EdgeConnection(node_id='height', field='a'), destination=EdgeConnection(node_id='3', field='height')),
+                Edge(source=EdgeConnection(node_id='width', field='a'), destination=EdgeConnection(node_id='4', field='width')),
+                Edge(source=EdgeConnection(node_id='height', field='a'), destination=EdgeConnection(node_id='4', field='height')),
+                Edge(source=EdgeConnection(node_id='3', field='noise'), destination=EdgeConnection(node_id='4', field='noise')),
+                Edge(source=EdgeConnection(node_id='4', field='latents'), destination=EdgeConnection(node_id='5', field='latents')),
+            ]
+        ),
+        exposed_inputs=[
+            ExposedNodeInput(node_path='4', field='prompt', alias='prompt'),
+            ExposedNodeInput(node_path='width', field='a', alias='width'),
+            ExposedNodeInput(node_path='height', field='a', alias='height')
+        ],
+        exposed_outputs=[
+            ExposedNodeOutput(node_path='5', field='image', alias='image')
+        ])
+
+
+def create_system_graphs(graph_library: ItemStorageABC[LibraryGraph]) -> list[LibraryGraph]:
+    """Creates the default system graphs, or adds new versions if the old ones don't match"""
+
+    graphs: list[LibraryGraph] = list()
+
+    text_to_image = graph_library.get(default_text_to_image_graph_id)
+    
+    # TODO: Check if the graph is the same as the default one, and if not, update it
+    #if text_to_image is None:
+    text_to_image = create_text_to_image()
+    graph_library.set(text_to_image)
+
+    graphs.append(text_to_image)
+
+    return graphs
diff --git a/invokeai/app/services/graph.py b/invokeai/app/services/graph.py
index e286569bcc..44f6a3d69e 100644
--- a/invokeai/app/services/graph.py
+++ b/invokeai/app/services/graph.py
@@ -17,7 +17,7 @@ from typing import (
 )
 
 import networkx as nx
-from pydantic import BaseModel, validator
+from pydantic import BaseModel, root_validator, validator
 from pydantic.fields import Field
 
 from ..invocations import *
@@ -283,7 +283,8 @@ class Graph(BaseModel):
         :raises InvalidEdgeError: the provided edge is invalid.
         """
 
-        if self._is_edge_valid(edge) and edge not in self.edges:
+        self._validate_edge(edge)
+        if edge not in self.edges:
             self.edges.append(edge)
         else:
             raise InvalidEdgeError()
@@ -354,7 +355,7 @@ class Graph(BaseModel):
 
         return True
 
-    def _is_edge_valid(self, edge: Edge) -> bool:
+    def _validate_edge(self, edge: Edge):
         """Validates that a new edge doesn't create a cycle in the graph"""
 
         # Validate that the nodes exist (edges may contain node paths, so we can't just check for nodes directly)
@@ -362,54 +363,53 @@ class Graph(BaseModel):
             from_node = self.get_node(edge.source.node_id)
             to_node = self.get_node(edge.destination.node_id)
         except NodeNotFoundError:
-            return False
+            raise InvalidEdgeError("One or both nodes don't exist")
 
         # Validate that an edge to this node+field doesn't already exist
         input_edges = self._get_input_edges(edge.destination.node_id, edge.destination.field)
         if len(input_edges) > 0 and not isinstance(to_node, CollectInvocation):
-            return False
+            raise InvalidEdgeError(f'Edge to node {edge.destination.node_id} field {edge.destination.field} already exists')
 
         # Validate that no cycles would be created
         g = self.nx_graph_flat()
         g.add_edge(edge.source.node_id, edge.destination.node_id)
         if not nx.is_directed_acyclic_graph(g):
-            return False
+            raise InvalidEdgeError(f'Edge creates a cycle in the graph')
 
         # Validate that the field types are compatible
         if not are_connections_compatible(
             from_node, edge.source.field, to_node, edge.destination.field
         ):
-            return False
+            raise InvalidEdgeError(f'Fields are incompatible')
 
         # Validate if iterator output type matches iterator input type (if this edge results in both being set)
         if isinstance(to_node, IterateInvocation) and edge.destination.field == "collection":
             if not self._is_iterator_connection_valid(
                 edge.destination.node_id, new_input=edge.source
             ):
-                return False
+                raise InvalidEdgeError(f'Iterator input type does not match iterator output type')
 
         # Validate if iterator input type matches output type (if this edge results in both being set)
         if isinstance(from_node, IterateInvocation) and edge.source.field == "item":
             if not self._is_iterator_connection_valid(
                 edge.source.node_id, new_output=edge.destination
             ):
-                return False
+                raise InvalidEdgeError(f'Iterator output type does not match iterator input type')
 
         # Validate if collector input type matches output type (if this edge results in both being set)
         if isinstance(to_node, CollectInvocation) and edge.destination.field == "item":
             if not self._is_collector_connection_valid(
                 edge.destination.node_id, new_input=edge.source
             ):
-                return False
+                raise InvalidEdgeError(f'Collector output type does not match collector input type')
 
         # Validate if collector output type matches input type (if this edge results in both being set)
         if isinstance(from_node, CollectInvocation) and edge.source.field == "collection":
             if not self._is_collector_connection_valid(
                 edge.source.node_id, new_output=edge.destination
             ):
-                return False
+                raise InvalidEdgeError(f'Collector input type does not match collector output type')
 
-        return True
 
     def has_node(self, node_path: str) -> bool:
         """Determines whether or not a node exists in the graph."""
@@ -733,7 +733,7 @@ class Graph(BaseModel):
         for sgn in (
             gn for gn in self.nodes.values() if isinstance(gn, GraphInvocation)
         ):
-            sgn.graph.nx_graph_flat(g, self._get_node_path(sgn.id, prefix))
+            g = sgn.graph.nx_graph_flat(g, self._get_node_path(sgn.id, prefix))
 
         # TODO: figure out if iteration nodes need to be expanded
 
@@ -858,7 +858,8 @@ class GraphExecutionState(BaseModel):
 
     def is_complete(self) -> bool:
         """Returns true if the graph is complete"""
-        return self.has_error() or all((k in self.executed for k in self.graph.nodes))
+        node_ids = set(self.graph.nx_graph_flat().nodes)
+        return self.has_error() or all((k in self.executed for k in node_ids))
 
     def has_error(self) -> bool:
         """Returns true if the graph has any errors"""
@@ -946,11 +947,11 @@ class GraphExecutionState(BaseModel):
 
     def _iterator_graph(self) -> nx.DiGraph:
         """Gets a DiGraph with edges to collectors removed so an ancestor search produces all active iterators for any node"""
-        g = self.graph.nx_graph()
+        g = self.graph.nx_graph_flat()
         collectors = (
             n
             for n in self.graph.nodes
-            if isinstance(self.graph.nodes[n], CollectInvocation)
+            if isinstance(self.graph.get_node(n), CollectInvocation)
         )
         for c in collectors:
             g.remove_edges_from(list(g.in_edges(c)))
@@ -962,7 +963,7 @@ class GraphExecutionState(BaseModel):
         iterators = [
             n
             for n in nx.ancestors(g, node_id)
-            if isinstance(self.graph.nodes[n], IterateInvocation)
+            if isinstance(self.graph.get_node(n), IterateInvocation)
         ]
         return iterators
 
@@ -1098,7 +1099,9 @@ class GraphExecutionState(BaseModel):
 
     # TODO: Add API for modifying underlying graph that checks if the change will be valid given the current execution state
     def _is_edge_valid(self, edge: Edge) -> bool:
-        if not self._is_edge_valid(edge):
+        try:
+            self.graph._validate_edge(edge)
+        except InvalidEdgeError:
             return False
 
         # Invalid if destination has already been prepared or executed
@@ -1144,4 +1147,52 @@ class GraphExecutionState(BaseModel):
         self.graph.delete_edge(edge)
 
 
+class ExposedNodeInput(BaseModel):
+    node_path: str = Field(description="The node path to the node with the input")
+    field: str = Field(description="The field name of the input")
+    alias: str = Field(description="The alias of the input")
+
+
+class ExposedNodeOutput(BaseModel):
+    node_path: str = Field(description="The node path to the node with the output")
+    field: str = Field(description="The field name of the output")
+    alias: str = Field(description="The alias of the output")
+
+class LibraryGraph(BaseModel):
+    id: str = Field(description="The unique identifier for this library graph", default_factory=uuid.uuid4)
+    graph: Graph = Field(description="The graph")
+    name: str = Field(description="The name of the graph")
+    description: str = Field(description="The description of the graph")
+    exposed_inputs: list[ExposedNodeInput] = Field(description="The inputs exposed by this graph", default_factory=list)
+    exposed_outputs: list[ExposedNodeOutput] = Field(description="The outputs exposed by this graph", default_factory=list)
+
+    @validator('exposed_inputs', 'exposed_outputs')
+    def validate_exposed_aliases(cls, v):
+        if len(v) != len(set(i.alias for i in v)):
+            raise ValueError("Duplicate exposed alias")
+        return v
+    
+    @root_validator
+    def validate_exposed_nodes(cls, values):
+        graph = values['graph']
+
+        # Validate exposed inputs
+        for exposed_input in values['exposed_inputs']:
+            if not graph.has_node(exposed_input.node_path):
+                raise ValueError(f"Exposed input node {exposed_input.node_path} does not exist")
+            node = graph.get_node(exposed_input.node_path)
+            if get_input_field(node, exposed_input.field) is None:
+                raise ValueError(f"Exposed input field {exposed_input.field} does not exist on node {exposed_input.node_path}")
+
+        # Validate exposed outputs
+        for exposed_output in values['exposed_outputs']:
+            if not graph.has_node(exposed_output.node_path):
+                raise ValueError(f"Exposed output node {exposed_output.node_path} does not exist")
+            node = graph.get_node(exposed_output.node_path)
+            if get_output_field(node, exposed_output.field) is None:
+                raise ValueError(f"Exposed output field {exposed_output.field} does not exist on node {exposed_output.node_path}")
+
+        return values
+
+
 GraphInvocation.update_forward_refs()
diff --git a/invokeai/app/services/invocation_services.py b/invokeai/app/services/invocation_services.py
index 2cd0f55fd9..c3c6bbce7e 100644
--- a/invokeai/app/services/invocation_services.py
+++ b/invokeai/app/services/invocation_services.py
@@ -19,6 +19,7 @@ class InvocationServices:
     restoration: RestorationServices
 
     # NOTE: we must forward-declare any types that include invocations, since invocations can use services
+    graph_library: ItemStorageABC["LibraryGraph"]
     graph_execution_manager: ItemStorageABC["GraphExecutionState"]
     processor: "InvocationProcessorABC"
 
@@ -29,6 +30,7 @@ class InvocationServices:
             latents: LatentsStorageBase,
             images: ImageStorageBase,
             queue: InvocationQueueABC,
+            graph_library: ItemStorageABC["LibraryGraph"],
             graph_execution_manager: ItemStorageABC["GraphExecutionState"],
             processor: "InvocationProcessorABC",
             restoration: RestorationServices,
@@ -38,6 +40,7 @@ class InvocationServices:
         self.latents = latents
         self.images = images
         self.queue = queue
+        self.graph_library = graph_library
         self.graph_execution_manager = graph_execution_manager
         self.processor = processor
         self.restoration = restoration
diff --git a/invokeai/app/services/sqlite.py b/invokeai/app/services/sqlite.py
index fd089014bb..e06ca8c1ac 100644
--- a/invokeai/app/services/sqlite.py
+++ b/invokeai/app/services/sqlite.py
@@ -35,8 +35,7 @@ class SqliteItemStorage(ItemStorageABC, Generic[T]):
         self._create_table()
 
     def _create_table(self):
-        try:
-            self._lock.acquire()
+        with self._lock:
             self._cursor.execute(
                 f"""CREATE TABLE IF NOT EXISTS {self._table_name} (
                 item TEXT,
@@ -45,34 +44,27 @@ class SqliteItemStorage(ItemStorageABC, Generic[T]):
             self._cursor.execute(
                 f"""CREATE UNIQUE INDEX IF NOT EXISTS {self._table_name}_id ON {self._table_name}(id);"""
             )
-        finally:
-            self._lock.release()
+            self._conn.commit()
 
     def _parse_item(self, item: str) -> T:
         item_type = get_args(self.__orig_class__)[0]
         return parse_raw_as(item_type, item)
 
     def set(self, item: T):
-        try:
-            self._lock.acquire()
+        with self._lock:
             self._cursor.execute(
                 f"""INSERT OR REPLACE INTO {self._table_name} (item) VALUES (?);""",
                 (item.json(),),
             )
             self._conn.commit()
-        finally:
-            self._lock.release()
         self._on_changed(item)
 
     def get(self, id: str) -> Union[T, None]:
-        try:
-            self._lock.acquire()
+        with self._lock:
             self._cursor.execute(
                 f"""SELECT item FROM {self._table_name} WHERE id = ?;""", (str(id),)
             )
             result = self._cursor.fetchone()
-        finally:
-            self._lock.release()
 
         if not result:
             return None
@@ -80,19 +72,15 @@ class SqliteItemStorage(ItemStorageABC, Generic[T]):
         return self._parse_item(result[0])
 
     def delete(self, id: str):
-        try:
-            self._lock.acquire()
+        with self._lock:
             self._cursor.execute(
                 f"""DELETE FROM {self._table_name} WHERE id = ?;""", (str(id),)
             )
             self._conn.commit()
-        finally:
-            self._lock.release()
         self._on_deleted(id)
 
     def list(self, page: int = 0, per_page: int = 10) -> PaginatedResults[T]:
-        try:
-            self._lock.acquire()
+        with self._lock:
             self._cursor.execute(
                 f"""SELECT item FROM {self._table_name} LIMIT ? OFFSET ?;""",
                 (per_page, page * per_page),
@@ -103,8 +91,6 @@ class SqliteItemStorage(ItemStorageABC, Generic[T]):
 
             self._cursor.execute(f"""SELECT count(*) FROM {self._table_name};""")
             count = self._cursor.fetchone()[0]
-        finally:
-            self._lock.release()
 
         pageCount = int(count / per_page) + 1
 
@@ -115,8 +101,7 @@ class SqliteItemStorage(ItemStorageABC, Generic[T]):
     def search(
         self, query: str, page: int = 0, per_page: int = 10
     ) -> PaginatedResults[T]:
-        try:
-            self._lock.acquire()
+        with self._lock:
             self._cursor.execute(
                 f"""SELECT item FROM {self._table_name} WHERE item LIKE ? LIMIT ? OFFSET ?;""",
                 (f"%{query}%", per_page, page * per_page),
@@ -130,8 +115,6 @@ class SqliteItemStorage(ItemStorageABC, Generic[T]):
                 (f"%{query}%",),
             )
             count = self._cursor.fetchone()[0]
-        finally:
-            self._lock.release()
 
         pageCount = int(count / per_page) + 1
 
diff --git a/pyproject.toml b/pyproject.toml
index 3d72483237..ec6aabfb8b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ dependencies = [
   "clip_anytorch",          # replacing "clip @ https://github.com/openai/CLIP/archive/eaa22acb90a5876642d0507623e859909230a52d.zip",
   "compel==1.0.5",
   "datasets",
-  "diffusers[torch]~=0.14",
+  "diffusers[torch]==0.14",
   "dnspython==2.2.1",
   "einops",
   "eventlet",
diff --git a/tests/nodes/test_graph_execution_state.py b/tests/nodes/test_graph_execution_state.py
index 506b8653f8..f65129797e 100644
--- a/tests/nodes/test_graph_execution_state.py
+++ b/tests/nodes/test_graph_execution_state.py
@@ -7,7 +7,7 @@ from invokeai.app.services.processor import DefaultInvocationProcessor
 from invokeai.app.services.sqlite import SqliteItemStorage, sqlite_memory
 from invokeai.app.services.invocation_queue import MemoryInvocationQueue
 from invokeai.app.services.invocation_services import InvocationServices
-from invokeai.app.services.graph import Graph, GraphInvocation, InvalidEdgeError, NodeAlreadyInGraphError, NodeNotFoundError, are_connections_compatible, EdgeConnection, CollectInvocation, IterateInvocation, GraphExecutionState
+from invokeai.app.services.graph import Graph, GraphInvocation, InvalidEdgeError, LibraryGraph, NodeAlreadyInGraphError, NodeNotFoundError, are_connections_compatible, EdgeConnection, CollectInvocation, IterateInvocation, GraphExecutionState
 import pytest
 
 
@@ -28,6 +28,9 @@ def mock_services():
         images = None, # type: ignore
         latents = None, # type: ignore
         queue = MemoryInvocationQueue(),
+        graph_library=SqliteItemStorage[LibraryGraph](
+            filename=sqlite_memory, table_name="graphs"
+        ),
         graph_execution_manager = SqliteItemStorage[GraphExecutionState](filename = sqlite_memory, table_name = 'graph_executions'),
         processor = DefaultInvocationProcessor(),
         restoration = None, # type: ignore
diff --git a/tests/nodes/test_invoker.py b/tests/nodes/test_invoker.py
index 68df708bdd..46d532b9f7 100644
--- a/tests/nodes/test_invoker.py
+++ b/tests/nodes/test_invoker.py
@@ -5,7 +5,7 @@ from invokeai.app.services.invocation_queue import MemoryInvocationQueue
 from invokeai.app.services.invoker import Invoker
 from invokeai.app.invocations.baseinvocation import BaseInvocation, BaseInvocationOutput, InvocationContext
 from invokeai.app.services.invocation_services import InvocationServices
-from invokeai.app.services.graph import Graph, GraphInvocation, InvalidEdgeError, NodeAlreadyInGraphError, NodeNotFoundError, are_connections_compatible, EdgeConnection, CollectInvocation, IterateInvocation, GraphExecutionState
+from invokeai.app.services.graph import Graph, GraphInvocation, InvalidEdgeError, LibraryGraph, NodeAlreadyInGraphError, NodeNotFoundError, are_connections_compatible, EdgeConnection, CollectInvocation, IterateInvocation, GraphExecutionState
 import pytest
 
 
@@ -26,6 +26,9 @@ def mock_services() -> InvocationServices:
         images = None, # type: ignore
         latents = None, # type: ignore
         queue = MemoryInvocationQueue(),
+        graph_library=SqliteItemStorage[LibraryGraph](
+            filename=sqlite_memory, table_name="graphs"
+        ),
         graph_execution_manager = SqliteItemStorage[GraphExecutionState](filename = sqlite_memory, table_name = 'graph_executions'),
         processor = DefaultInvocationProcessor(),
         restoration = None, # type: ignore
diff --git a/tests/nodes/test_node_graph.py b/tests/nodes/test_node_graph.py
index b864e1e47a..c7693b59c9 100644
--- a/tests/nodes/test_node_graph.py
+++ b/tests/nodes/test_node_graph.py
@@ -1,9 +1,11 @@
-from invokeai.app.invocations.image import *
-
 from .test_nodes import ListPassThroughInvocation, PromptTestInvocation
 from invokeai.app.services.graph import Edge, Graph, GraphInvocation, InvalidEdgeError, NodeAlreadyInGraphError, NodeNotFoundError, are_connections_compatible, EdgeConnection, CollectInvocation, IterateInvocation
 from invokeai.app.invocations.generate import ImageToImageInvocation, TextToImageInvocation
 from invokeai.app.invocations.upscale import UpscaleInvocation
+from invokeai.app.invocations.image import *
+from invokeai.app.invocations.math import AddInvocation, SubtractInvocation
+from invokeai.app.invocations.params import ParamIntInvocation
+from invokeai.app.services.default_graphs import create_text_to_image
 import pytest
 
 
@@ -417,6 +419,66 @@ def test_graph_gets_subgraph_node():
     assert result.id == '1'
     assert result == n1_1
 
+
+def test_graph_expands_subgraph():
+    g = Graph()
+    n1 = GraphInvocation(id = "1")
+    n1.graph = Graph()
+
+    n1_1 = AddInvocation(id = "1", a = 1, b = 2)
+    n1_2 = SubtractInvocation(id = "2", b = 3)
+    n1.graph.add_node(n1_1)
+    n1.graph.add_node(n1_2)
+    n1.graph.add_edge(create_edge("1","a","2","a"))
+
+    g.add_node(n1)
+
+    n2 = AddInvocation(id = "2", b = 5)
+    g.add_node(n2)
+    g.add_edge(create_edge("1.2","a","2","a"))
+
+    dg = g.nx_graph_flat()
+    assert set(dg.nodes) == set(['1.1', '1.2', '2'])
+    assert set(dg.edges) == set([('1.1', '1.2'), ('1.2', '2')])
+
+
+def test_graph_subgraph_t2i():
+    g = Graph()
+    n1 = GraphInvocation(id = "1")
+
+    # Get text to image default graph
+    lg = create_text_to_image()
+    n1.graph = lg.graph
+
+    g.add_node(n1)
+
+    n2 = ParamIntInvocation(id = "2", a = 512)
+    n3 = ParamIntInvocation(id = "3", a = 256)
+
+    g.add_node(n2)
+    g.add_node(n3)
+
+    g.add_edge(create_edge("2","a","1.width","a"))
+    g.add_edge(create_edge("3","a","1.height","a"))
+    
+    n4 = ShowImageInvocation(id = "4")
+    g.add_node(n4)
+    g.add_edge(create_edge("1.5","image","4","image"))
+
+    # Validate
+    dg = g.nx_graph_flat()
+    assert set(dg.nodes) == set(['1.width', '1.height', '1.3', '1.4', '1.5', '2', '3', '4'])
+    expected_edges = [(f'1.{e.source.node_id}',f'1.{e.destination.node_id}') for e in lg.graph.edges]
+    expected_edges.extend([
+        ('2','1.width'),
+        ('3','1.height'),
+        ('1.5','4')
+    ])
+    print(expected_edges)
+    print(list(dg.edges))
+    assert set(dg.edges) == set(expected_edges)
+
+
 def test_graph_fails_to_get_missing_subgraph_node():
     g = Graph()
     n1 = GraphInvocation(id = "1")