| DF1 |
C12 (Checkpoint Storage) |
C2 (JsonPlusSerializer) |
Serialized checkpoint bytes (msgpack/JSON/pickle) |
DC3 |
TB2 |
Database read |
| DF2 |
C2 (JsonPlusSerializer) |
C1 (Pregel) |
Deserialized Python objects (channel state) |
DC3, DC6 |
TB2 |
Function call |
| DF3 |
LLM (external) |
C3 (ToolNode) |
Tool call arguments (JSON strings in AIMessage) |
— |
TB1 |
Function call (via langchain-core) |
| DF4 |
C3 (ToolNode) |
C10 (User Tools) |
Parsed argument dicts merged with injected state/store/runtime |
— |
TB1 |
tool.invoke(call_args) |
| DF5 |
C4 (RemoteGraph) |
C1 (Pregel) |
Stream chunks (JSON-deserialized dicts) |
— |
TB3 |
HTTPS / SSE |
| DF6 |
langgraph.json |
C8 (CLI) |
Config dict (graphs, env, store, auth, encryption, http, webhooks,
checkpointer, ui) |
— |
TB4 |
json.load() |
| DF7 |
C8 (CLI) |
Docker |
Dockerfile content with embedded ENV values |
— |
TB4 |
asyncio.create_subprocess_exec |
| DF8 |
C11 (User Nodes) |
C1 (Pregel) |
State updates (arbitrary Python objects) |
— |
TB1 |
Channel write |
| DF9 |
C9 (SDK Client) |
C4 (RemoteGraph) |
API responses (JSON) |
— |
TB3 |
HTTPS |
| DF10 |
User config |
C7 (EncryptedSerializer) |
AES key from LANGGRAPH_AES_KEY env var |
DC2 |
TB2 |
os.getenv() |
| DF11 |
C12 (Checkpoint Storage) |
C14 (BaseCache) |
Cached task results via JsonPlusSerializer |
DC3 |
TB2 |
Database read |
| DF12 |
LangGraph Server |
C9 (SDK Client) |
HTTP responses with Location header |
DC1 |
TB3 |
HTTP redirect |
| DF13 |
C9 (SDK Client) |
Redirect target |
Request headers including x-api-key |
DC1 |
TB3 |
HTTPS |
| DF14 |
C1 (Pregel state) |
C3 (ToolNode) |
InjectedState/InjectedStore/ToolRuntime values for tool
injection |
DC3, DC4 |
TB1 |
Function call (dict merge) |
| DF15 |
Developer code |
C17 (SDK Encryption Handlers) |
Encryption/decryption handler functions and context handler |
— |
TB5 |
Python decorator registration |