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refactor(core): leave address validation to langsmith `LangChainTracer` no longer checks that `address` is a `langsmith.Agent`: langsmith rejects anything else when the run is sent, with its own error. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

fix/tracer-agent-addressing-default-project

1 hour ago

refactor(core): leave the tracer destination to langsmith unless code names one `LangChainTracer` no longer reads the `LANGSMITH_AGENT_*` env vars or inspects the langsmith `Run` model. It sends a project only when one is named in code (argument, tracing context, or parent run), or an explicit `langsmith.Agent`; otherwise langsmith resolves the env address or default project itself. `project_name` stays readable and settable. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

fix/tracer-agent-addressing-default-project

1 hour ago

Merge branch 'master' into fix/reasoning-model-structured-output

visnu64:fix/reasoning-model-structured-output

4 hours ago

Merge branch 'master' into uditstocks/langchain/jump-to-tools-pending-dispatch

uditstocks:uditstocks/langchain/jump-to-tools-pending-dispatch

5 hours ago

chore(deps): bump fsspec from 2026.6.0 to 2026.9.0 in /libs/langchain_v1 (#41097) Bumps [fsspec](https://github.com/fsspec/filesystem_spec) from 2026.6.0 to 2026.9.0. <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/fsspec/filesystem_spec/commit/0f76baaae4a227b085b18e8469e6cc1792a95ade"><code>0f76baa</code></a> changelog (<a href="https://redirect.github.com/fsspec/filesystem_spec/issues/2166">#2166</a>)</li> <li><a href="https://github.com/fsspec/filesystem_spec/commit/695f831c2a2c55b48b11045ea2f2b34d529eaa43"><code>695f831</code></a> Add age-based cleanup for simplecache (<a href="https://redirect.github.com/fsspec/filesystem_spec/issues/2118">#2118</a>)</li> <li><a href="https://github.com/fsspec/filesystem_spec/commit/42aa46875c50f43d2d258540981772b86da7a6fb"><code>42aa468</code></a> Mirror <code>readinto</code> from the pyarrow stream onto <code>ArrowFile</code> (<a href="https://redirect.github.com/fsspec/filesystem_spec/issues/2111">#2111</a>)</li> <li><a href="https://github.com/fsspec/filesystem_spec/commit/4a4e6ae778d9cbc8f036a0b7af9467d94d0acac6"><code>4a4e6ae</code></a> Make the SFTP host key policy configurable (<a href="https://redirect.github.com/fsspec/filesystem_spec/issues/2126">#2126</a>)</li> <li><a href="https://github.com/fsspec/filesystem_spec/commit/a0ce6dbecad9d42f19a2e1462cb61fec9b77da2e"><code>a0ce6db</code></a> Normalize paths in AsyncFileSystemWrapper like the wrapped filesystem (<a href="https://redirect.github.com/fsspec/filesystem_spec/issues/2159">#2159</a>)</li> <li><a href="https://github.com/fsspec/filesystem_spec/commit/c5fea6d8e8c140a0cacbe94fa573df5becbf192e"><code>c5fea6d</code></a> Fix cat_ranges on whole-file caches after <a href="https://redirect.github.com/fsspec/filesystem_spec/issues/2154">#2154</a> (<a href="https://redirect.github.com/fsspec/filesystem_spec/issues/2163">#2163</a>)</li> <li><a href="https://github.com/fsspec/filesystem_spec/commit/9efb18b4939d01ac9b06a481bda8125f48dbc738"><code>9efb18b</code></a> Patch HAS_CPYTHON_API where _fast_slice reads it (<a href="https://redirect.github.com/fsspec/filesystem_spec/issues/2164">#2164</a>)</li> <li><a href="https://github.com/fsspec/filesystem_spec/commit/27bcd35c5487570da9f3a97fd66a3f4268ca0c87"><code>27bcd35</code></a> feat(AdaptiveReadaheadCache): introducing a new cache-type adaptive (<a href="https://redirect.github.com/fsspec/filesystem_spec/issues/2093">#2093</a>)</li> <li><a href="https://github.com/fsspec/filesystem_spec/commit/a681aca115b6687a1ea1fcfd4ac1f5f8c4cc03c5"><code>a681aca</code></a> Ignore a leading slash in TarFileSystem paths (<a href="https://redirect.github.com/fsspec/filesystem_spec/issues/2148">#2148</a>)</li> <li><a href="https://github.com/fsspec/filesystem_spec/commit/57c55f87d780856181653eca4d5cc14e22d8e5f9"><code>57c55f8</code></a> Make names relative in DirFileSystem.walk(detail=True) (<a href="https://redirect.github.com/fsspec/filesystem_spec/issues/2160">#2160</a>)</li> <li>Additional commits viewable in <a href="https://github.com/fsspec/filesystem_spec/compare/2026.6.0...2026.9.0">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=fsspec&package-manager=uv&previous-version=2026.6.0&new-version=2026.9.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- <details> <summary>Dependabot commands and options</summary> <br /> You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot show <dependency name> ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself) You can disable automated security fix PRs for this repo from the [Security Alerts page](https://github.com/langchain-ai/langchain/network/alerts). </details> Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

master

9 hours ago

test(langchain): tighten types in the per-call HITL tests Type resume answers as `Decision`, extra middleware as plain `AgentMiddleware` (its type parameters have defaults), and `_agent`'s return as the agent type `create_agent` builds, instead of `Any`.

fix/hitl-per-call-interrupts

9 hours ago

fix(langchain): pass a per-call edit to the tool as the reviewer sent it The edit check returned the validated args, which the tool then validated again, so a transforming validator ran twice on an edit (`x=1` reached the tool as `x=3`, versus `x=2` on approve). Check the answer, then pass it on unchanged, so the tool validates edited args once, as it does on approve. This also replaces the `exclude_unset` dump: only the fields sent are passed. Docs: say which validators are part of the edit check (field validators are; `args_schema` validator methods run when the tool does), and that a `when` flipping to `False` on resume makes batched mode raise rather than run the tool. The injected-args test now also uses a transforming validator.

fix/hitl-per-call-interrupts

9 hours ago

test(langchain): tighten types in the per-call HITL tests Type resume answers as `Decision`, extra middleware as plain `AgentMiddleware` (its type parameters have defaults), and `_agent`'s return as the agent type `create_agent` builds, instead of `Any`.

fix/hitl-per-call-interrupts

10 hours ago

Latest Branches

0%

feat(core): support langsmith agent addressing in `LangChainTracer`#40832

1 hour ago

63f6a49

fix/tracer-agent-addressing-default-project

0%

fix: handle reasoning model output tags in structured output parsing#40147

4 hours ago

51a07a0

visnu64:fix/reasoning-model-structured-output

0%

fix(langchain): stop `jump_to="tools"` from bypassing HITL review#41023

5 hours ago

9ae66fb

uditstocks:uditstocks/langchain/jump-to-tools-pending-dispatch

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