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feat(langgraph): tracePolicy - #2794

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feat(langgraph): tracePolicy#2794
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@hntrl Hunter Lovell (hntrl) commented Sep 6, 2026

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((TO BE PUBLISHED AS RC))

  • looking to get this out quickly to test in a real deployment, the appropriate fix will be a second stable release in @langchain/core that adds trace policy to RunnableSequence

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Latest commit: a6daa99

The changes in this PR will be included in the next version bump.

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npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint@2794

@langchain/langgraph-checkpoint-mongodb

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint-mongodb@2794

@langchain/langgraph-checkpoint-postgres

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint-postgres@2794

@langchain/langgraph-checkpoint-redis

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint-redis@2794

@langchain/langgraph-checkpoint-sqlite

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint-sqlite@2794

@langchain/langgraph-checkpoint-validation

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-checkpoint-validation@2794

create-langgraph

npm i https://pkg.pr.new/langchain-ai/langgraphjs/create-langgraph@2794

@langchain/langgraph-api

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-api@2794

@langchain/langgraph-cli

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-cli@2794

@langchain/langgraph

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph@2794

@langchain/langgraph-cua

npm i https://pkg.pr.new/langchain-ai/langgraphjs/@langchain/langgraph-cua@2794

@langchain/langgraph-supervisor

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Comment thread libs/langgraph-core/src/pregel/runnable.ts Outdated
@hntrl
Hunter Lovell (hntrl) merged commit 83a4b62 into main Sep 6, 2026
29 checks passed
@hntrl
Hunter Lovell (hntrl) deleted the hunter/trace-policy branch September 6, 2026 01:11
@github-actions github-actions Bot mentioned this pull request Sep 6, 2026
Merged
Hunter Lovell (hntrl) added a commit that referenced this pull request Sep 6, 2026
@github-actions @hntrl
chore: version packages (rc) (#2798)
bbbdb5a 
This PR was opened by the [Changesets
release](https://github.com/changesets/action) GitHub action. When
you're ready to do a release, you can merge this and the packages will
be published to npm automatically. If you're not ready to do a release
yet, that's fine, whenever you add more changesets to main, this PR will
be updated.

⚠️⚠️⚠️⚠️⚠️⚠️

`main` is currently in **pre mode** so this branch has prereleases
rather than normal releases. If you want to exit prereleases, run
`changeset pre exit` on `main`.

⚠️⚠️⚠️⚠️⚠️⚠️

# Releases
## @langchain/langgraph-api@1.4.6-rc.0

### Patch Changes

- [#2751](#2751)
[`0a9611a`](0a9611a)
Thanks [@t3s7r](https://github.com/t3s7r)! - fix(api): `run.start` with
input on a cancelled thread no longer folds the input into
`Command(resume)`. A cancelled run shares the "interrupted" status with
a genuine `interrupt()` pause, but has no pending interrupt to consume
the resume value, so the submitted message was silently dropped. The
input-vs-resume decision now keys on whether the thread actually has
pending interrupts (both in the protocol service and the embed
protocol).
- Updated dependencies
[[`83a4b62`](83a4b62),
[`2fab6fd`](2fab6fd)]:
  - @langchain/langgraph@1.4.15-rc.0
  - @langchain/langgraph-sdk@1.10.3-rc.0
  - @langchain/langgraph-ui@1.4.6-rc.0
## @langchain/langgraph-cli@1.4.6-rc.0

### Patch Changes

- Updated dependencies
[[`0a9611a`](0a9611a)]:
  - @langchain/langgraph-api@1.4.6-rc.0
## @langchain/langgraph@1.4.15-rc.0

### Patch Changes

- [#2794](#2794)
[`83a4b62`](83a4b62)
Thanks [@hntrl](https://github.com/hntrl)! - feat(langgraph): add
per-node `tracePolicy` input/output processors and `omitPayload`
  
Transform the payloads recorded on a node's own trace run while
retaining its span and timing. Processors receive raw values and fall
back to the original payload if they throw. Graph state, root runs, and
child runs remain unchanged when processors do not mutate their
arguments.
  
Matches Python's callback-level behavior: transforms also affect chain
events and message streaming, so omitting outputs can suppress messages
returned directly by nodes and omitting inputs can affect message
deduplication.
- Updated dependencies
[[`2fab6fd`](2fab6fd)]:
  - @langchain/langgraph-sdk@1.10.3-rc.0
## @langchain/langgraph-cua@1.0.3-rc.0

### Patch Changes

- Updated dependencies
[[`83a4b62`](83a4b62)]:
  - @langchain/langgraph@1.4.15-rc.0
## @langchain/langgraph-supervisor@1.1.2-rc.0

### Patch Changes

- Updated dependencies
[[`83a4b62`](83a4b62)]:
  - @langchain/langgraph@1.4.15-rc.0
## @langchain/langgraph-swarm@1.0.3-rc.0

### Patch Changes

- Updated dependencies
[[`83a4b62`](83a4b62)]:
  - @langchain/langgraph@1.4.15-rc.0
## @langchain/langgraph-sdk@1.10.3-rc.0

### Patch Changes

- [#2762](#2762)
[`2fab6fd`](2fab6fd)
Thanks [@JessYanCoding](https://github.com/JessYanCoding)! - Send
`checkpoint_id` in the `runs.stream()` request body, so a `checkpointId`
passed to `client.runs.stream()` forks from the requested checkpoint
instead of being silently dropped. Matches `runs.create()` and
`runs.wait()`, which already send it.
## @langchain/angular@1.0.36-rc.0

### Patch Changes

- Updated dependencies
[[`2fab6fd`](2fab6fd)]:
  - @langchain/langgraph-sdk@1.10.3-rc.0
## @langchain/react@1.0.36-rc.0

### Patch Changes

- Updated dependencies
[[`2fab6fd`](2fab6fd)]:
  - @langchain/langgraph-sdk@1.10.3-rc.0
## @langchain/svelte@1.0.36-rc.0

### Patch Changes

- Updated dependencies
[[`2fab6fd`](2fab6fd)]:
  - @langchain/langgraph-sdk@1.10.3-rc.0
## @langchain/vue@1.0.36-rc.0

### Patch Changes

- Updated dependencies
[[`2fab6fd`](2fab6fd)]:
  - @langchain/langgraph-sdk@1.10.3-rc.0
## @langchain/langgraph-ui@1.4.6-rc.0

No changes in this release.

---------

Signed-off-by: Hunter Lovell <40191806+hntrl@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Hunter Lovell <hunter@hntrl.io>
Co-authored-by: Hunter Lovell <40191806+hntrl@users.noreply.github.com>
@hntrl Hunter Lovell (hntrl) mentioned this pull request Sep 6, 2026
Merged
Hunter Lovell (hntrl) added a commit to langchain-ai/deepagentsjs that referenced this pull request Sep 6, 2026
@hntrl
fix(deepagents): omit middleware trace inputs (#837)
22cc873 
(in an rc release, using this to test in a real deployment)

* adopts a policy of dropping inputs for built in middleware -- we
seldom get value out of these input values and for large traces this can
cause issues

see langchain-ai/langchainjs#11568 and
langchain-ai/langgraphjs#2794

---------

Signed-off-by: Hunter Lovell <40191806+hntrl@users.noreply.github.com>
This was referenced Sep 11, 2026
Merged
Open
Hunter Lovell (hntrl) pushed a commit that referenced this pull request Sep 12, 2026
@github-actions
chore: version packages (#2832)
592fd0c 
This PR was opened by the [Changesets
release](https://github.com/changesets/action) GitHub action. When
you're ready to do a release, you can merge this and the packages will
be published to npm automatically. If you're not ready to do a release
yet, that's fine, whenever you add more changesets to main, this PR will
be updated.


# Releases
## @langchain/langgraph-sdk@1.11.0

### Minor Changes

- [#2831](#2831)
[`3234c69`](3234c69)
Thanks [@ramon-langchain](https://github.com/ramon-langchain)! - Expose
connection lifecycle callbacks for built-in streaming transports.
  
`onConnected` runs after the initial SSE or WebSocket connection becomes
usable and after every successful reconnect. Its payload distinguishes
an `initial` connection from a `reconnected` connection and includes the
reconnect attempt number.
  
`onReconnect` now also receives the scheduled `delayMs`, allowing
applications to display accurate retry state before the next connection
attempt. React, Vue, Svelte, and Angular stream hooks forward both
callbacks.

### Patch Changes

- [#2831](#2831)
[`3234c69`](3234c69)
Thanks [@ramon-langchain](https://github.com/ramon-langchain)! - Recover
cleanly when a thread's root event stream terminates unexpectedly.
  
If the stream fails or closes while a run is active, the controller now
records the transport error and clears `isLoading` rather than leaving
the UI in a permanently running state. Once the failed pump settles, a
later submission can start a fresh root subscription without recreating
the thread stream or replaying the failed command.

- [#2809](#2809)
[`11a4535`](11a4535)
Thanks [@hntrl](https://github.com/hntrl)! - fix(sdk): appropriately
track persisted seq for stream replay
  
Sequences weren't being appropriately attributed when rehydrating the
page (e.g. on refresh). This meant we'd lose stream information on
`useStream` on reloads. This has been fixed by adding a lookup step to
determine what the most appropriate sequence index is to track in the
event stream.:x

- [#2762](#2762)
[`2fab6fd`](2fab6fd)
Thanks [@JessYanCoding](https://github.com/JessYanCoding)! - Send
`checkpoint_id` in the `runs.stream()` request body, so a `checkpointId`
passed to `client.runs.stream()` forks from the requested checkpoint
instead of being silently dropped. Matches `runs.create()` and
`runs.wait()`, which already send it.

- [#2813](#2813)
[`4fc118f`](4fc118f)
Thanks [@eliornl](https://github.com/eliornl)! - fix(sdk): show
interrupts raised after a passive thread rejoin
  
After a page refresh mid-run, `useStream` filtered every interrupt it
did not
already know from the hydrated thread state as replayed history, and
waited
for a `checkpoints` event to lift that filter. Current runtimes never
emit
that event and the replay buffer trims it on long runs, so interrupts
raised
after the refresh never appeared until the next reload. Unknown
interrupts are
now settled against the server's thread state when the run reaches a
terminal
lifecycle: the ones the server lists as pending are shown, the rest are
  dropped as history.

- [#2812](#2812)
[`db4bdad`](db4bdad)
Thanks [@eliornl](https://github.com/eliornl)! - fix(sdk): recover from
a server-side thread stream drop instead of freezing
  
The protocol SSE transport now reconnects when the server closes the
event
stream cleanly. The thread stream is open-ended, so a clean close only
happens
when the server's own upstream consumer died or it is restarting;
before, the
client treated it as the end of the thread and the UI froze mid-run with
no
error. A connection that delivered events also resets the reconnect
budget, so
long-lived pages survive repeated deploys. `maxReconnectAttempts: 0`
keeps the
  old end-on-close behavior.
  
Unsolicited server error frames (no command id) and a shared stream that
gives
up reconnecting now reach `stream.error`: `ThreadStream.onError` exposes
them,
`useStream` sets `error`, clears `isLoading`, and settles the in-flight
  `submit()` as failed.

- [#2808](#2808)
[`55fa26b`](55fa26b)
Thanks [@hntrl](https://github.com/hntrl)! - fix(sdk): coalesce locally
resolved interrupts
  
when resolving interrupts using `useStream`, there was a case where we
prioritized the remote state values (which we lookup in React Strict
mode on every page transition) over the local interrupt responses we
know we've responded with.
  
This has since been fixed to first prioritize the local cache of
interrupts, resolved against the remote state values when a run hits a
terminal event
## @langchain/angular@1.1.0

### Minor Changes

- [#2831](#2831)
[`3234c69`](3234c69)
Thanks [@ramon-langchain](https://github.com/ramon-langchain)! - Expose
connection lifecycle callbacks for built-in streaming transports.
  
`onConnected` runs after the initial SSE or WebSocket connection becomes
usable and after every successful reconnect. Its payload distinguishes
an `initial` connection from a `reconnected` connection and includes the
reconnect attempt number.
  
`onReconnect` now also receives the scheduled `delayMs`, allowing
applications to display accurate retry state before the next connection
attempt. React, Vue, Svelte, and Angular stream hooks forward both
callbacks.

### Patch Changes

- Updated dependencies
[[`3234c69`](3234c69),
[`3234c69`](3234c69),
[`11a4535`](11a4535),
[`2fab6fd`](2fab6fd),
[`4fc118f`](4fc118f),
[`db4bdad`](db4bdad),
[`55fa26b`](55fa26b)]:
  - @langchain/langgraph-sdk@1.11.0
## @langchain/react@1.1.0

### Minor Changes

- [#2831](#2831)
[`3234c69`](3234c69)
Thanks [@ramon-langchain](https://github.com/ramon-langchain)! - Expose
connection lifecycle callbacks for built-in streaming transports.
  
`onConnected` runs after the initial SSE or WebSocket connection becomes
usable and after every successful reconnect. Its payload distinguishes
an `initial` connection from a `reconnected` connection and includes the
reconnect attempt number.
  
`onReconnect` now also receives the scheduled `delayMs`, allowing
applications to display accurate retry state before the next connection
attempt. React, Vue, Svelte, and Angular stream hooks forward both
callbacks.

### Patch Changes

- Updated dependencies
[[`3234c69`](3234c69),
[`3234c69`](3234c69),
[`11a4535`](11a4535),
[`2fab6fd`](2fab6fd),
[`4fc118f`](4fc118f),
[`db4bdad`](db4bdad),
[`55fa26b`](55fa26b)]:
  - @langchain/langgraph-sdk@1.11.0
## @langchain/svelte@1.1.0

### Minor Changes

- [#2831](#2831)
[`3234c69`](3234c69)
Thanks [@ramon-langchain](https://github.com/ramon-langchain)! - Expose
connection lifecycle callbacks for built-in streaming transports.
  
`onConnected` runs after the initial SSE or WebSocket connection becomes
usable and after every successful reconnect. Its payload distinguishes
an `initial` connection from a `reconnected` connection and includes the
reconnect attempt number.
  
`onReconnect` now also receives the scheduled `delayMs`, allowing
applications to display accurate retry state before the next connection
attempt. React, Vue, Svelte, and Angular stream hooks forward both
callbacks.

### Patch Changes

- Updated dependencies
[[`3234c69`](3234c69),
[`3234c69`](3234c69),
[`11a4535`](11a4535),
[`2fab6fd`](2fab6fd),
[`4fc118f`](4fc118f),
[`db4bdad`](db4bdad),
[`55fa26b`](55fa26b)]:
  - @langchain/langgraph-sdk@1.11.0
## @langchain/vue@1.1.0

### Minor Changes

- [#2831](#2831)
[`3234c69`](3234c69)
Thanks [@ramon-langchain](https://github.com/ramon-langchain)! - Expose
connection lifecycle callbacks for built-in streaming transports.
  
`onConnected` runs after the initial SSE or WebSocket connection becomes
usable and after every successful reconnect. Its payload distinguishes
an `initial` connection from a `reconnected` connection and includes the
reconnect attempt number.
  
`onReconnect` now also receives the scheduled `delayMs`, allowing
applications to display accurate retry state before the next connection
attempt. React, Vue, Svelte, and Angular stream hooks forward both
callbacks.

### Patch Changes

- Updated dependencies
[[`3234c69`](3234c69),
[`3234c69`](3234c69),
[`11a4535`](11a4535),
[`2fab6fd`](2fab6fd),
[`4fc118f`](4fc118f),
[`db4bdad`](db4bdad),
[`55fa26b`](55fa26b)]:
  - @langchain/langgraph-sdk@1.11.0
## @langchain/langgraph-api@1.4.6

### Patch Changes

- [#2751](#2751)
[`0a9611a`](0a9611a)
Thanks [@t3s7r](https://github.com/t3s7r)! - fix(api): `run.start` with
input on a cancelled thread no longer folds the input into
`Command(resume)`. A cancelled run shares the "interrupted" status with
a genuine `interrupt()` pause, but has no pending interrupt to consume
the resume value, so the submitted message was silently dropped. The
input-vs-resume decision now keys on whether the thread actually has
pending interrupts (both in the protocol service and the embed
protocol).
- Updated dependencies []:
  - @langchain/langgraph-ui@1.4.6
## @langchain/langgraph-cli@1.4.6

### Patch Changes

- Updated dependencies
[[`0a9611a`](0a9611a)]:
  - @langchain/langgraph-api@1.4.6
## @langchain/langgraph@1.4.15

### Patch Changes

- [#2794](#2794)
[`83a4b62`](83a4b62)
Thanks [@hntrl](https://github.com/hntrl)! - feat(langgraph): add
per-node `tracePolicy` input/output processors and `omitPayload`
  
Transform the payloads recorded on a node's own trace run while
retaining its span and timing. Processors receive raw values and fall
back to the original payload if they throw. Graph state, root runs, and
child runs remain unchanged when processors do not mutate their
arguments.
  
Matches Python's callback-level behavior: transforms also affect chain
events and message streaming, so omitting outputs can suppress messages
returned directly by nodes and omitting inputs can affect message
deduplication.
- Updated dependencies
[[`3234c69`](3234c69),
[`3234c69`](3234c69),
[`11a4535`](11a4535),
[`2fab6fd`](2fab6fd),
[`4fc118f`](4fc118f),
[`db4bdad`](db4bdad),
[`55fa26b`](55fa26b)]:
  - @langchain/langgraph-sdk@1.11.0
## @langchain/langgraph-cua@1.0.3

No changes in this release.
## @langchain/langgraph-supervisor@1.1.2

No changes in this release.
## @langchain/langgraph-swarm@1.0.3

No changes in this release.
## @langchain/langgraph-ui@1.4.6

No changes in this release.

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
@github-actions github-actions Bot mentioned this pull request Sep 12, 2026
Open
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