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Add checkpointer to agent creation #1340

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Add checkpointer to agent creation #1340

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18707eb
Add checkpointer to agent creation
mcavdar Nov 8, 2025
548c93d
Merge branch 'main' into patch-14
mcavdar Nov 16, 2025
e60ad3b
add checkpointer js as well
mcavdar Nov 16, 2025
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7 changes: 6 additions & 1 deletion src/oss/langchain/short-term-memory.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -952,6 +952,7 @@ graph TD
:::python
```python
from langchain.messages import RemoveMessage
from langchain_core.runnables import RunnableConfig
from langgraph.graph.message import REMOVE_ALL_MESSAGES
from langgraph.checkpoint.memory import InMemorySaver
from langchain.agents import create_agent, AgentState
Expand Down Expand Up @@ -982,7 +983,8 @@ def trim_messages(state: AgentState, runtime: Runtime) -> dict[str, Any] | None:
agent = create_agent(
model,
tools=tools,
middleware=[trim_messages]
middleware=[trim_messages],
checkpointer=InMemorySaver()
)

config: RunnableConfig = {"configurable": {"thread_id": "1"}}
Expand All @@ -1005,6 +1007,7 @@ If you'd like me to call you a nickname or use a different name, just say the wo
```typescript
import { RemoveMessage } from "@langchain/core/messages";
import { createAgent, createMiddleware, trimMessages, type AgentState } from "langchain";
import { MemorySaver } from "@langchain/langgraph";

const trimMessageHistory = createMiddleware({
name: "TrimMessages",
Expand All @@ -1020,10 +1023,12 @@ const trimMessageHistory = createMiddleware({
},
});

const checkpointer = new MemorySaver();
const agent = createAgent({
model: "gpt-5-nano",
tools: [],
middleware: [trimMessageHistory],
checkpointer,
});
```
:::
Expand Down