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fix(core): avoid eager `pydantic.v1` import in `@deprecated` (#37308) `langchain_core._api.deprecation` previously did `from pydantic.v1.fields import FieldInfo as FieldInfoV1` at module scope, which triggers Pydantic's `UserWarning("Core Pydantic V1 functionality isn't compatible with Python 3.14 or greater.")` on every `langchain_core` import under 3.14+. The v1 symbol is only needed inside one runtime branch of `@deprecated`, so it's now resolved lazily. ## Changes - Replace the top-level v1 `FieldInfo` import with `_is_pydantic_v1_field_info`, which probes `sys.modules.get("pydantic.v1.fields")` instead of forcing the import. The reconstruction inside `deprecated`'s `finalize` closure imports `FieldInfoV1` lazily, gated by the predicate — so the warning only fires if a caller has already loaded `pydantic.v1` themselves. - Add a subprocess-based regression test asserting that importing `langchain_core._api.deprecation` does not pull any `pydantic.v1*` module into `sys.modules`. Verified to fail when the eager import is reintroduced. - Add a v1 `FieldInfo` decoration test — the v1 branch of `@deprecated` previously had zero direct coverage. - Update the stale `# Last Any should be FieldInfoV1 but this leads to circular imports` comment on `T`'s bound, which no longer reflects the real reason (it's about the 3.14 warning, not circularity).

master

8 hours ago

fix(core): avoid eager pydantic.v1 import in @deprecated `langchain_core._api.deprecation` previously did `from pydantic.v1.fields import FieldInfo as FieldInfoV1` at module scope, which triggers Pydantic's `UserWarning("Core Pydantic V1 functionality isn't compatible with Python 3.14 or greater.")` on every `langchain_core` import under 3.14+. The v1 symbol is only needed inside one runtime branch of `@deprecated`, so it's now resolved lazily. ## Changes - Replace the top-level v1 `FieldInfo` import with `_is_pydantic_v1_field_info`, which probes `sys.modules.get("pydantic.v1.fields")` instead of forcing the import. The reconstruction inside `deprecated`'s `finalize` closure imports `FieldInfoV1` lazily, gated by the predicate — so the warning only fires if a caller has already loaded `pydantic.v1` themselves. - Add a subprocess-based regression test asserting that importing `langchain_core._api.deprecation` does not pull any `pydantic.v1*` module into `sys.modules`. Verified to fail when the eager import is reintroduced. - Add a v1 `FieldInfo` decoration test — the v1 branch of `@deprecated` previously had zero direct coverage. - Update the stale `# Last Any should be FieldInfoV1 but this leads to circular imports` comment on `T`'s bound, which no longer reflects the real reason (it's about the 3.14 warning, not circularity).

mdrxy/core-pyd-v1-depr

8 hours ago

release(langchain): 1.2.18 (#37250)

master

2 days ago

bump core and increment version

cc/release_langchain

2 days ago

revert: feat(langchain): ls_agent_type tag on create_agent calls (#37249)

master

2 days ago

add regression test

cc/revert

2 days ago

Merge branch 'master' into fix/openai-file-block-mime-type

anmolg1997:fix/openai-file-block-mime-type

2 days ago

chore: bump mistune from 3.1.4 to 3.2.1 in /libs/core (#37237) Bumps [mistune](https://github.com/lepture/mistune) from 3.1.4 to 3.2.1. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/lepture/mistune/releases">mistune's releases</a>.</em></p> <blockquote> <h2>v3.2.1</h2> <h3> 🐞 Bug Fixes</h3> <ul> <li>Resolve Windows compatibility issues in file inclusion and tests - by <a href="https://github.com/Yuki9814"><code>@Yuki9814</code></a> <a href="https://github.com/lepture/mistune/commit/2547102">(25471)</a></li> <li>Escape html text - by <a href="https://github.com/lepture"><code>@lepture</code></a> <a href="https://github.com/lepture/mistune/commit/a3cb6e5">(a3cb6)</a></li> <li>Update link reference - by <a href="https://github.com/lepture"><code>@lepture</code></a> <a href="https://github.com/lepture/mistune/commit/85eb54f">(85eb5)</a></li> <li>Handle escaped dollar signs in inline math - by <a href="https://github.com/saschabuehrle"><code>@saschabuehrle</code></a> in <a href="https://redirect.github.com/lepture/mistune/issues/370">lepture/mistune#370</a> <a href="https://github.com/lepture/mistune/commit/7bd5709">(7bd57)</a></li> <li>Escape id of toc - by <a href="https://github.com/lepture"><code>@lepture</code></a> <a href="https://github.com/lepture/mistune/commit/04880a0">(04880)</a></li> <li>Escape id of headings - by <a href="https://github.com/lepture"><code>@lepture</code></a> <a href="https://github.com/lepture/mistune/commit/2855622">(28556)</a></li> <li>Remove double-encoding of image alt text - by <a href="https://github.com/lawrence3699"><code>@lawrence3699</code></a> <a href="https://github.com/lepture/mistune/commit/0d6f3d8">(0d6f3)</a></li> <li>Escape xml for math plugin - by <a href="https://github.com/lepture"><code>@lepture</code></a> <a href="https://github.com/lepture/mistune/commit/5fa092e">(5fa09)</a></li> <li>Use strict regex for image's height and width - by <a href="https://github.com/lepture"><code>@lepture</code></a> <a href="https://github.com/lepture/mistune/commit/8d0cb75">(8d0cb)</a></li> </ul> <h5> <a href="https://github.com/lepture/mistune/compare/v3.2.0...v3.2.1">View changes on GitHub</a></h5> <h2>v3.2.0</h2> <h3> 🚀 Features</h3> <ul> <li>Support footnotes that start on the next line. - by <a href="https://github.com/kylechui"><code>@kylechui</code></a> <a href="https://github.com/lepture/mistune/commit/2677e2d">(2677e)</a></li> <li>Properly handle code blocks inside footnotes. - by <a href="https://github.com/kylechui"><code>@kylechui</code></a> <a href="https://github.com/lepture/mistune/commit/0516c9e">(0516c)</a></li> <li>Support python 3.14 - by <a href="https://github.com/lepture"><code>@lepture</code></a> <a href="https://github.com/lepture/mistune/commit/7e0eb65">(7e0eb)</a></li> </ul> <h3> 🐞 Bug Fixes</h3> <ul> <li>Render ref links and footnotes in footnotes. - by <a href="https://github.com/lepture"><code>@lepture</code></a> <a href="https://github.com/lepture/mistune/commit/bd90e44">(bd90e)</a></li> <li>Render ref links in TOC. - by <a href="https://github.com/lemon24"><code>@lemon24</code></a> <a href="https://github.com/lepture/mistune/commit/a0a0148">(a0a01)</a></li> <li>Update typing for mypy upgrades - by <a href="https://github.com/lepture"><code>@lepture</code></a> <a href="https://github.com/lepture/mistune/commit/8d49cba">(8d49c)</a></li> <li>Render correct html for footnotes - by <a href="https://github.com/lepture"><code>@lepture</code></a> <a href="https://github.com/lepture/mistune/commit/9b62204">(9b622)</a></li> </ul> <h5> <a href="https://github.com/lepture/mistune/compare/v3.1.4...v3.2.0">View changes on GitHub</a></h5> </blockquote> </details> <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/lepture/mistune/blob/main/docs/changes.rst">mistune's changelog</a>.</em></p> <blockquote> <h2>Version 3.2.1</h2> <p><strong>Released on May 3, 2026</strong></p> <ul> <li>Escape link in <code>render_toc_ul</code>.</li> <li>Escape text in math plugin.</li> <li>Fix regex for math plugin.</li> <li>Escape heading's ID attribute.</li> <li>Fix <code>LINK_TITLE_RE</code> to prevent DoS.</li> <li>Escape class attribute for admonition directive.</li> <li>Remove double-encoding of image alt text.</li> <li>Escape class attribute for image directive.</li> <li>Fix width/height attribute for image directive.</li> </ul> <h2>Version 3.2.0</h2> <p><strong>Released on Dec 23, 2025</strong></p> <ul> <li>Announce supports for python 3.14</li> <li>Fix footnotes plugins for code blocks, ref links, blockquote and etc.</li> <li>Fix ref links in TOC.</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/lepture/mistune/commit/067f90861088a496942f5eb43236135352b85d39"><code>067f908</code></a> chore: release 3.2.1</li> <li><a href="https://github.com/lepture/mistune/commit/bf5503067a7d8c3b065fb143f67a3a08eca77bb6"><code>bf55030</code></a> Merge pull request <a href="https://redirect.github.com/lepture/mistune/issues/438">#438</a> from saschabuehrle/fix/issue-370</li> <li><a href="https://github.com/lepture/mistune/commit/8d0cb7539a9ac82e633b98476b9922632eb8b948"><code>8d0cb75</code></a> fix: use strict regex for image's height and width</li> <li><a href="https://github.com/lepture/mistune/commit/5fa092e3053b86f16e4c49b9d3ba0b7ab63f09ab"><code>5fa092e</code></a> fix: escape xml for math plugin</li> <li><a href="https://github.com/lepture/mistune/commit/71ec9477ebfcf8dab0068804baf2c77461d77fbb"><code>71ec947</code></a> Merge pull request <a href="https://redirect.github.com/lepture/mistune/issues/440">#440</a> from lawrence3699/fix/image-alt-double-encoding</li> <li><a href="https://github.com/lepture/mistune/commit/0d6f3d850283d51e9c60e5a1b3c9343a18df3722"><code>0d6f3d8</code></a> fix: remove double-encoding of image alt text</li> <li><a href="https://github.com/lepture/mistune/commit/2855622d7fe235c6c805716edff943b5945d1eea"><code>2855622</code></a> fix: escape id of headings</li> <li><a href="https://github.com/lepture/mistune/commit/04880a004cb28318e5ebd7ee9e63c79fc9f9ed04"><code>04880a0</code></a> fix: escape id of toc</li> <li><a href="https://github.com/lepture/mistune/commit/7bd57096715385062505b3f78972be9fa823d6d4"><code>7bd5709</code></a> fix: handle escaped dollar signs in inline math (fixes <a href="https://redirect.github.com/lepture/mistune/issues/370">#370</a>)</li> <li><a href="https://github.com/lepture/mistune/commit/85eb54ff17da26327399bf188f9ff9b8fd515278"><code>85eb54f</code></a> fix: update link reference</li> <li>Additional commits viewable in <a href="https://github.com/lepture/mistune/compare/v3.1.4...v3.2.1">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=mistune&package-manager=uv&previous-version=3.1.4&new-version=3.2.1)](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

3 days ago

Latest Branches

+18%

fix(core): avoid eager `pydantic.v1` import in `@deprecated`#37308

8 hours ago

ea011f9

mdrxy/core-pyd-v1-depr

0%

release(langchain): 1.2.18#37250

2 days ago

5573a2e

cc/release_langchain

0%

revert: feat(langchain): ls_agent_type tag on create_agent calls#37249

2 days ago

f9bddcd

cc/revert

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