feat(duckdb): add duckdb custom_user_agent #487
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mdrxy
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Dec 26, 2025
## Overview This page still had workaround MotherDuck token syntax from pre-duckdb-1.0. I updated the syntax and opportunistically fixed MotherDuck capitalization. ## Type of change **Type:** Update existing documentation ## Related issues/PRs I noticed this when working on testing langchain-ai/langchain-community#487 , but it's not actually related. ## Checklist <!-- Put an 'x' in all boxes that apply --> - [x] I have read the [contributing guidelines](README.md) - [x] I have tested my changes locally using `docs dev` - [x] All code examples have been tested and work correctly - n/a I have used **root relative** paths for internal links - n/a I have updated navigation in `src/docs.json` if needed AI disclosure: I normally use Claude Code, but the docs it generates continue being too verbose so I rewrote this all to be minimal.
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DuckDB has a
custom_user_agentfield that is used by hosted services like MotherDuck to identify the integration (python), framework (SQLAlchemy or none, depending on whether the loader is used) and the integration (LangChain!).This PR adds the
langchainidentifier to 2 out of the 3 DuckDB paths. The vectorstore was impractical to add it to, since it expects the end user to create the DuckDB connection first. It might be more ergonomic to have the user pass the connection string, but that's a side quest for a different Christmas.Adding conditional logic to
sql_database.pyis not ideal -- should I create a helper likefrom_cnosdb()instead?tests/unit_tests/document_loaders/test_recursive_url_loader.pyfail for me. These seem unrelated to my changes; let's see what CI says.Gen AI disclaimer: I use Claude Code to generate the first iteration, then pair program with it until the code meets my intent and standards. I am responsible for every line of code proposed.