# sparqlite: SPARQL 1.1 inside SQLite, written in Rust

> Source: <https://simonwillison.net/2026/Oct/16/sqlite-sparql-rust/>
> Published: 2026-10-16 01:58:00+00:00

**Research:** [sparqlite: SPARQL 1.1 inside SQLite, written in Rust](https://github.com/simonw/research/tree/main/sqlite-sparql-rust#readme)

This research task is really an experiment in running Claude Code for web in "Ultracode" mode, as described in [Orchestrate subagents at scale with dynamic workflows](https://code.claude.com/docs/en/workflows) in the Claude Code documentation.

With Ultracode turned on, Claude Code makes aggressive use of dynamic workflows - it generates JavaScript that defines and coordinates a network of subagents to take on complex problems.

My initial prompt was this - I meant "hit the rows directly", the word "delete" was an accidental typo on my phone:

`Write a SQLite extension in Rust that implants SPARQL and runs really fast because it can hit the delete rows directly`

This caused Claude Code for web to churn for over 12 hours. I checked in on its progress the next day and sent a single follow-up prompt when I noticed how many Rust crates it had built:

`Every folder in the crates/ directory needs a README`

`Include a tutorial.md teaching users how to install the extension and how to run it in the SQLite CLI and then teaching them SPARQL in addition to how to use the SQLite extension`

`Include a script with the tutorial for populating a SQLite database with useful and realistic example data for that tutorial`

This project feels like next-level vibe coding - it's not remotely feasible to review the code that was produced here, and even following the documentation is a significant investment in work. I'm not entirely sure what to do with this - I appear to have a full SPARQL implementation in Rust inside SQLite now, but how valuable is that if I created it on a whim and can't (or won't) invest the necessary time to understand what it can do?

Tags: [rdf](https://simonwillison.net/tags/rdf), [semantic-web](https://simonwillison.net/tags/semantic-web), [sqlite](https://simonwillison.net/tags/sqlite), [ai](https://simonwillison.net/tags/ai), [rust](https://simonwillison.net/tags/rust), [generative-ai](https://simonwillison.net/tags/generative-ai), [llms](https://simonwillison.net/tags/llms), [coding-agents](https://simonwillison.net/tags/coding-agents), [claude-code](https://simonwillison.net/tags/claude-code)