langchain - 💡(How to fix) Fix docs(core): InMemoryVectorStore public methods are missing docstrings

Submission checklist

• This is a bug, not a usage question.
• I added a clear and descriptive title that summarizes this issue.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in LangChain rather than my code.
• The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).
• This is not related to the langchain-community package.
• I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS.

Package (Required)

• langchain
• langchain-openai
• langchain-anthropic
• langchain-classic
• langchain-core
• langchain-model-profiles
• langchain-tests
• langchain-text-splitters
• langchain-chroma
• langchain-deepseek
• langchain-exa
• langchain-fireworks
• langchain-groq
• langchain-huggingface
• langchain-mistralai
• langchain-nomic
• langchain-ollama
• langchain-openrouter
• langchain-perplexity
• langchain-qdrant
• langchain-xai
• Other / not sure / general

Related Issues / PRs

No response

Reproduction Steps / Example Code (Python)

from langchain_core.vectorstores import InMemoryVectorStore
help(InMemoryVectorStore.similarity_search)
# Returns no docstring — method is undocumented

Error Message and Stack Trace (if applicable)

Description

Several public methods in InMemoryVectorStore (libs/core/langchain_core/vectorstores/in_memory.py) have no docstrings while the parent VectorStore class documents them fully.

Expected: methods like similarity_search, delete, add_documents, from_texts etc. should have docstrings consistent with the parent class.

Currently: calling help() on these methods returns no documentation.

I have a fix ready and will open a PR immediately.

System Info

python -m langchain_core.sys_info