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Add per-thread TTL configuration #1316

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21 changes: 20 additions & 1 deletion src/langsmith/configure-ttl.mdx
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Original file line number Diff line number Diff line change
@@ -1,7 +1,9 @@
---
title: How to add TTLs to your application
sidebarTitle: Add TTLs to your application

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@lnhsingh lnhsingh Nov 13, 2025

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---

<Tip>
**Prerequisites**
This guide assumes familiarity with [LangSmith](/langsmith/home), [Persistence](/oss/langgraph/persistence), and [Cross-thread persistence](/oss/langgraph/persistence#memory-store) concepts.
Expand All @@ -11,6 +13,8 @@ LangSmith persists both [checkpoints](/oss/langgraph/persistence#checkpoints) (t

## Configuring checkpoint TTL


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@lnhsingh lnhsingh Nov 13, 2025

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Checkpoints capture the state of conversation threads. Setting a TTL ensures old checkpoints and threads are automatically deleted.

Add a `checkpointer.ttl` configuration to your `langgraph.json` file:
Expand All @@ -22,7 +26,7 @@ Add a `checkpointer.ttl` configuration to your `langgraph.json` file:
"agent": "./agent.py:graph"
},
"checkpointer": {
"ttl": {
"ttl": {c
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"ttl": {c
"ttl": {

"strategy": "delete",
"sweep_interval_minutes": 60,
"default_ttl": 43200
Expand Down Expand Up @@ -88,6 +92,21 @@ You can configure TTLs for both checkpoints and store items in the same `langgra
}
```

## Configuring Per-Thread TTL
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@katmayb katmayb Nov 13, 2025

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## Configuring Per-Thread TTL
## Configure per-thread TTL


From `langgraph-api` [v0.4.11](https://docs.langchain.com/langsmith/agent-server-changelog#v0-4-11) you are now able to apply TTL configurations per-thread via thread updates. Here is an example:
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From `langgraph-api` [v0.4.11](https://docs.langchain.com/langsmith/agent-server-changelog#v0-4-11) you are now able to apply TTL configurations per-thread via thread updates. Here is an example:
You can apply [TTL configurations per-thread](https://reference.langchain.com/python/langsmith/deployment/sdk/#langgraph_sdk.client.ThreadsClient.create).


```python
thread = await client.threads.create(
ttl={
"strategy": "delete",
"ttl": 43200 # 30 days in minutes
}
)
```



## Runtime overrides

The default `store.ttl` settings from `langgraph.json` can be overridden at runtime by providing specific TTL values in SDK method calls like `get`, `put`, and `search`.
Expand Down