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Simon Willison's Weblog

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simonw/browser-compat-db
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IA Programmation

simonw/browser-compat-db

simonw/browser-compat-db Inspired by Mozilla's new MDN MCP service - source code here - I decided to try converting their comprehensive mdn/browser-compat-data repository full of browser compatibility data into a SQLite database. This new GitHub repo includes a Claude Code for web (Opus 4.8) generated script for doing that using sqlite-utils. I wanted the resulting ~66MB SQLite database to be available via the GitHub CDN with open CORS headers. GitHub releases don't have those, but any file…

Simon Willison's Weblog
Quoting Tom MacWright
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IA Programmation

Quoting Tom MacWright

In the last few months, I've started to see [job applications] that were clearly cowritten by an LLM, link to an LLM-generated portfolio site, which then links to LLM-generated GitHub projects, with purely LLM-generated commit messages. [...] My other reaction is that I don't know anything about these people. They haven't put themselves out there. They haven't said anything true. [...] The perfected, generated, prompted resume is generic and impersonal. It tells me nothing about this person,…

Simon Willison's Weblog
datasette 1.0a35 Récent
IA Programmation

datasette 1.0a35

Release: datasette 1.0a35 I'll write more about this one tomorrow, but it's a big release. Three highlights from the release notes: New "Create table" interface in the database actions menu, backed by the /<database>/-/create JSON API. It can define columns, primary keys, custom column types, NOT NULL constraints, literal defaults, expression defaults and single-column foreign keys. (#2787) New "Alter table" table action and /<database>/<table>/-/alter JSON API for changing…

Simon Willison's Weblog
OPFS + Pyodide test harness
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IA Programmation

OPFS + Pyodide test harness

Tool: OPFS + Pyodide test harness I've been pondering if Datasette Lite - the Python Datasette application run entirely in the browser using Pyodide and WebAssembly - might be able to edit persistent SQLite files stored on the user's computer. That's what OFPS (Origin Private File System) is for, so I had Claude Code for web build me this playground UI to try it out in different browsers. Tags: browsers, pyodide, datasette-lite

Simon Willison's Weblog
Prompt Injection as Role Confusion
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IA Programmation

Prompt Injection as Role Confusion

Prompt Injection as Role Confusion First, I absolutely love this: This is a blog-style writeup of the paper. I wish every paper would come with one of these. Academic writing is pretty dry - the impact of a paper can be so much higher if you publish a readable version to accompany the formal one. Charles Ye, Jasmine Cui, and Dylan Hadfield-Menell present some fascinating research into the challenge of having models distinguish their own privileged text (here wrapped in role tags like…

Simon Willison's Weblog
Porting the Moebius 0.2B image inpainting model to run in the browser with Claude Code Récent
IA Programmation

Porting the Moebius 0.2B image inpainting model to run in the browser with Claude Code

This morning on Hacker News I saw Moebius: 0.2B Lightweight Image Inpainting Framework with 10B-Level Performance, describing a small but effective inpainting model - a model where you can mark regions of an image to remove and the model imagines what should fill the space. The released model required PyTorch and NVIDIA CUDA, but since it described itself as 0.2B I decided to try and get it running using WebGPU in a browser. TL;DR: I got it working, and you can try the demo at…

Simon Willison's Weblog
sqlite-utils 4.0rc1 adds migrations and nested transactions
IA Programmation

sqlite-utils 4.0rc1 adds migrations and nested transactions

sqlite-utils is my combined Python library and CLI tool for working with SQLite databases. It provides an extensive set of higher-level operations on top of Python's default sqlite3 package, including support for complex table transformations, automatic table creation from JSON data and a whole lot more. I released sqlite-utils 4.0rc1, the first release candidate for sqlite-utils v4. The major version bump indicates some (minor) backwards incompatible changes, so I'm interested in having people…

Simon Willison's Weblog
Temporary Cloudflare Accounts for AI agents
IA Programmation

Temporary Cloudflare Accounts for AI agents

Temporary Cloudflare Accounts for AI agents The announcement says this is "for AI agents" but (as is pretty common these days) the AI hook isn't really necessary, this is an interesting feature for everyone else as well. Short version: you can now create a Cloudflare Workers project and run this, without even creating a Cloudflare account: npx wrangler deploy --temporary Cloudflare will deploy the application to a new, ephemeral project which will stay live for 60 minutes. I had GPT-5.5 xhigh…

Simon Willison's Weblog
Quoting Sean Lynch
IA Programmation

Quoting Sean Lynch

The real valuable capability MCP offers over skills/CLI is isolating the auth flow outside of the agent’s context window, and potentially out of the harness completely. [...] Maybe the idealized form of MCP is just an auth gateway for the API and nothing else. That’d still be a win. — Sean Lynch, comment on Hacker News Tags: model-context-protocol, llms, ai, generative-ai, skills

Simon Willison's Weblog
Datasette Apps: Host custom HTML applications inside Datasette
IA Programmation

Datasette Apps: Host custom HTML applications inside Datasette

Today we launched a new plugin for Datasette, datasette-apps, with this launch announcement post on the Datasette project blog. That post has the what, but I'm going to expand on that a little bit here to provide the why. The TL;DR Datasette Apps are self-contained HTML+JavaScript applications that run in a tightly constrained <iframe> sandbox hosted on your Datasette application. They can use JavaScript to run read-only SQL queries against data in Datasette, and can run write queries too…

Simon Willison's Weblog
datasette-acl 0.6a0
IA Programmation

datasette-acl 0.6a0

Release: datasette-acl 0.6a0 This release expands datasette-acl from table-only permissions toward a general resource-sharing system. Alex Garcia did most of the work for this release - we're fleshing out the plugin that will allow multi-user Datasette instances finely grained control over who can access which resources within Datasette. Tags: datasette, alex-garcia

Simon Willison's Weblog
GLM-5.2 is probably the most powerful text-only open weights LLM
IA Programmation

GLM-5.2 is probably the most powerful text-only open weights LLM

Chinese AI lab Z.ai released GLM-5.2 to their coding plan subscribers on June 13th, and then yesterday (June 16th) released the full open weights under an MIT license. Similar in size to their previous GLM-5 and GLM-5.1 releases, this is 753B parameter, 1.51TB monster - with 40 active parameters (Mixture of Experts). GLM-5.2 is a text input only model - Z.ai have a separate vision family most recently represented by GLM-5V-Turbo, but that one isn't open weights. GLM-5.2 has a 1 million token…

Simon Willison's Weblog
Quoting Charity Majors
IA Programmation

Quoting Charity Majors

What happened in 2025 was this: the economics of code production were turned upside down. Instead of being very hard, time-consuming, and expensive to generate code, it became effectively free and instant. Lines of code went from being treasured, reused, cared for and carefully curated, to being disposable and regenerable, practically overnight. — Charity Majors, AI demands more engineering discipline. Not less Tags: charity-majors, ai-assisted-programming, generative-ai, ai, llms

Simon Willison's Weblog
<click-to-play> — a still that plays
IA Programmation

<click-to-play> — a still that plays

Tool: &lt;click-to-play&gt; — a still that plays A progressive enchantment Web Component that turns this markup: &lt;click-to-play&gt; &lt;a href="URL to GIF"&gt; &lt;img src="URL to first frame" alt="..."&gt; &lt;/a&gt; &lt;/click-to-play&gt; Into a still frame with a click to play button which loads the GIF on demand. For when you don't want big GIFs to be loaded unless people want to play them. Here's an example that demonstrates the new row editing tools in Datasette - in fact I built this…

Simon Willison's Weblog
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