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docs: extend Langchain migration guide#10682

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langchain-guide-changes
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docs: extend Langchain migration guide#10682
kacperlukawski wants to merge 7 commits intomainfrom
langchain-guide-changes

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@kacperlukawski kacperlukawski commented Feb 26, 2026

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Proposed Changes:

Extend the migration guide so it covers agents, document stores and MCP tools.

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  • I have read the contributors guidelines and the code of conduct.
  • I have updated the related issue with new insights and changes.
  • I have added unit tests and updated the docstrings.
  • I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
  • I have documented my code.
  • I have added a release note file, following the contributors guidelines.
  • I have run pre-commit hooks and fixed any issue.

@kacperlukawski kacperlukawski requested a review from a team as a code owner February 26, 2026 12:16
@kacperlukawski kacperlukawski requested review from sjrl and removed request for a team February 26, 2026 12:16
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@kacperlukawski kacperlukawski requested review from bilgeyucel and removed request for sjrl February 26, 2026 12:16
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sjrl
sjrl reviewed Feb 26, 2026
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docs-website/docs/overview/migrating-from-langgraphlangchain-to-haystack.mdx Outdated
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@sjrl sjrl Feb 26, 2026

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This feature is no longer in experimental, it has been merged into main and the tutorial is updated to use haystack main

sjrl
sjrl reviewed Feb 26, 2026
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...bsite/versioned_docs/version-2.24/overview/migrating-from-langgraphlangchain-to-haystack.mdx
Comment on lines 83 to 89
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@sjrl sjrl Feb 26, 2026

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To get automatic parameter descriptions sent to the LLM we could slightly update the example to use the Annotated type. Docs explaining the concept here.

Suggested change
from typing import Annotated
def multiply(a: Annotated[int, "First int"], b: Annotated[int, "Second int"]) -> int:
"""Multiply \`a\` and \`b\`."""

Totally understand if not though to keep the example simple.

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@kacperlukawski kacperlukawski Mar 2, 2026

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I prefer to keep it simple. I get the benefits, though.

@kacperlukawski kacperlukawski force-pushed the langchain-guide-changes branch from 350b6d7 to a285ade Compare February 26, 2026 12:53
@kacperlukawski kacperlukawski requested a review from a team as a code owner March 2, 2026 11:52
@kacperlukawski kacperlukawski force-pushed the langchain-guide-changes branch from 6bc41cb to e47ba3e Compare March 2, 2026 12:02
@kacperlukawski kacperlukawski requested a review from sjrl March 2, 2026 12:07
bilgeyucel
bilgeyucel reviewed Mar 3, 2026
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Thanks @kacperlukawski! Left some minor comments

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docs: extend the Langchain migration guide

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