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Simon Willison's Weblog

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IA Programmation
Mermaid to Unicode box art (grok-mermaid)
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IA Programmation

Mermaid to Unicode box art (grok-mermaid)

Tool: Mermaid to Unicode box art (grok-mermaid) While exploring the codebase for the newly open-sourced Grok CLI coding agent I came across xai-grok-markdown/src/mermaid.rs, a "self-contained terminal renderer for Mermaid diagrams" written in Rust. I figured it would be fun to try that out in a browser via WebAssembly. Here's the prompt I ran in Claude Code for web (Fable 5), and this is what the resulting tool looks like: Tags: tools, rust, webassembly, mermaid, grok, xai

Simon Willison's Weblog
xai-org/grok-build, now open source
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IA Programmation

xai-org/grok-build, now open source

xai-org/grok-build, now open source xAI's grok CLI tool faced severe community backlash yesterday when it became apparent that running the command in a directory could upload that entire directory to xAI's Google Cloud buckets. One user reported running it in their home directory and seeing it upload "my SSH keys, my password manager database, my documents, photos, videos, everything". I've not seen an official explanation for why it was doing this, but xAI did respond to the feedback (Musk:…

Simon Willison's Weblog
How I tricked Claude into leaking your deepest, darkest secrets
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IA Programmation

How I tricked Claude into leaking your deepest, darkest secrets

How I tricked Claude into leaking your deepest, darkest secrets I've been impressed by the way the Claude web_fetch tool is designed to avoid data exfiltration attacks. Ayush Paul found a hole in that design. To recap: regular Claude chat is at risk of lethal trifecta attacks, because it has access to private data (in the form of memories of your past interactions) and has a tool for accessing online content which can both read hostile instructions and exfiltrate data through the URLs it…

Simon Willison's Weblog
simonw/pedalican
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IA Programmation

simonw/pedalican

simonw/pedalican Clearly I wasn't paying attention when these were first announced back in May, but today I accidentally activated a "pet" in Codex Desktop - a little animated robot, reminiscent of Clippy - and then learned you can create your own. So I did, and now I have a cute little pelican on a bicycle bouncing around my desktop giving me updates on my Codex tasks. Your browser does not support HTML5 video. The most interesting thing about this process was watching how the custom pet was…

Simon Willison's Weblog
lobste.rs is now running on SQLite
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IA Programmation

lobste.rs is now running on SQLite

lobste.rs is now running on SQLite Community site Lobsters has been planning a migration away from MariaDB since August 2018 - originally targeting PostgreSQL, but last year they decided to investigate SQLite instead. This weekend they completed the migration, and now consider it stable enough that it looks like this is the permanent architecture for the site going forward: SQLite seems to have passed with flying colors: cpu usage is down, memory usage is down, site seems to be snappier at…

Simon Willison's Weblog
Quoting Armin Ronacher
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IA Programmation

Quoting Armin Ronacher

The shared language of a software project is not English or Python but it is the common understanding of what its concepts mean, where the boundaries are, which invariants matter, who owns what, and why the system has the shape it does. This language is rarely written down in one place. It lives partly in documentation and code, but also in code review, conversations, arguments, and the experience of having to explain a change to somebody else. Before agents, some of this shared understanding…

Simon Willison's Weblog
Using uvx in GitHub Actions in a cache-friendly way
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IA Programmation

Using uvx in GitHub Actions in a cache-friendly way

TIL: Using uvx in GitHub Actions in a cache-friendly way I finally found a cache-friendly recipe for using uvx tool-name in GitHub Actions workflows that I like. The trick is setting a UV_EXCLUDE_NEWER: "2026-07-12" environment variable at the start of the workflow and then using that as part of the GitHub Actions cache key. This means any uvx tool-name commands will resolve to the most recent version as-of that date, and you can bust the cache and upgrade the tools by bumping the date in the…

Simon Willison's Weblog
DOOMQL
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IA Programmation

DOOMQL

DOOMQL Peter Gostev built this using GPT-5.6 Sol. This is a lot of fun: DOOMQL started with a deliberately unreasonable question: what if SQLite were the game engine, not merely the place where a game stores data? The result is a small, original Doom-like game in which SQL owns movement, collision, enemies, combat, progression and every RGB pixel on screen. It's implemented as a Python terminal script - I tried it out like this: cd /tmp git clone https://github.com/petergpt/doomql cd doomql uv…

Simon Willison's Weblog
datasette code-frequency chart on GitHub
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IA Programmation

datasette code-frequency chart on GitHub

datasette code-frequency chart on GitHub Out of curiosity I decided to see if I could find a useful illustration of the impact of coding agents and Opus 4.5 class models on my own output. The best I've found so far is this GitHub chart of frequency of code changes to my Datasette open source project: The big spike in activity at the end aligns with Opus 4.8, GPT-5.5, Fable 5 and GPT-5.6 Sol. Tags: github, ai, datasette, generative-ai, llms, ai-assisted-programming, coding-agents

Simon Willison's Weblog
Directly Responsible Individuals (DRI)
IA Programmation

Directly Responsible Individuals (DRI)

Directly Responsible Individuals (DRI) I went looking for a definition of "Directly Responsible Individuals" and the best I found was in the GitLab handbook. Apparently the term originated at Apple, where it's used to describe the person who is "ultimately accountable for the success or failure of a specific project, initiative, or activity". I've been thinking about this term recently in the context of LLM-powered agents and how they fit into human organizations. I don't think an agent should…

Simon Willison's Weblog
shot-scraper 1.11
IA Programmation

shot-scraper 1.11

Release: shot-scraper 1.11 Some minor improvements, mainly around command option consistency and making the server: mechanism used by both shot-scraper video and shot-scraper multi work if the server takes longer than a second to start serving traffic. server: processes used by shot-scraper multi and shot-scraper video now wait up to 30 seconds for the target URL to accept connections, polling for port availability and replacing the previous fixed one-second delay. #197 The shot-scraper, pdf,…

Simon Willison's Weblog
Fable gets another bump
IA Programmation

Fable gets another bump

One of the consequences of GPT-5.6 Sol being clearly a Fable/Mythos class model is that Anthropic have, once again, bumped the date that Fable stops being available in their Claude Max plans: We're extending Claude Fable 5 access on all paid plans, as well as keeping Claude Code’s weekly rate limits 50% higher, through July 19. As before, you can use up to half of your weekly usage limit on Fable 5. After that, you can continue using Fable 5 with usage credits, or switch to another model to…

Simon Willison's Weblog
sqlite-utils 4.1.1
IA Programmation

sqlite-utils 4.1.1

Release: sqlite-utils 4.1.1 Mainly a fix for an edge case that regular Claude chat spotted while experimenting with the 4.1 release to answer a question about ON DELETE. table.transform() now raises a TransactionError if called while a transaction is open with PRAGMA foreign_keys enabled and the table is referenced by foreign keys with destructive ON DELETE actions - CASCADE, SET NULL or SET DEFAULT. The pragma cannot be changed inside a transaction, so previously dropping the old table as part…

Simon Willison's Weblog