Several things changed at once. This post covers all of them.

Everything moved under ids/ ​

The identifier directories used to sit at the top level of the repository, next to its own files. They are now all under ids/.

Three reasons, in rough order of how often they came up:

• The repository had outgrown the GitHub web interface. There were too many files and directories for it to display.
• Basic information about the project was hard to find among a couple of thousand identifier directories.
• Hosted and non-hosted files were mixed together, with nothing in the layout to say which was which.

It also clears the way for the rest of this post. Now that everything the service actually serves is under one directory, tooling can tell the identifiers apart from the repository's own files without guessing.

If you maintain an identifier, the change is only where the directory lives: https://w3id.org/my-project/ still resolves the same way, and your .htaccess is unchanged.

Contributions are now checked ​

There is a checker in tools/check/. It runs on every pull request and reports only what your own change is responsible for — findings appear as comments on the changed lines, with the full report under Checks, and each one links to a page explaining the rule.

You can also run it by hand, over your own directory or over everything:

(cd tools/check && npm ci)   # once
node tools/check/bin/w3id-check.js ids/my-project

It finds thousands of issues across the tree today. They range from the entirely benign — trailing whitespace, a missing newline at the end of a file — to .htaccess errors serious enough that an identifier does not resolve at all. A rewrite rule can look completely reasonable, be written correctly, and never run.

This needs testing, and the rules need your feedback. Until now none of these rules were written down anywhere, so this is the first time most of them have met the tree. If the checker is wrong about your files, or if it stays quiet about something it should have caught, that is worth reporting at https://github.com/perma-id/w3id.org/issues. A rule that produces false positives is a bug in the rule.

A clean run is necessary but not sufficient. No checker can tell whether your redirect points where you meant it to.

You can run the service locally ​

tools/server/ has a supported Apache setup, so you can make a request to your own rules and see what happens, rather than reasoning about it. There are three ways in: a container, an Apache you already have, or one it builds for you that needs neither Docker nor root.

cd tools/server && docker compose up

The point of it is the module list. It loads what the production server loads and nothing else, so a directive from a module production does not run fails here too, at the moment you try it, instead of passing locally and breaking on deploy. It aligns with production rather than matching it exactly — the guide documents where it departs.

See Testing your changes for which method to reach for.

The documentation site ​

This site is new. Before it, a single README.md had to explain what a permanent identifier service is, how Apache rewrite rules work, and what a good contribution looks like, all at once.

It now holds:

• What the service is for and, more to the point, what it is not for. Most pull requests that get sent back are not wrong so much as out of scope — the service redirects, and it does not host files, serve content, run code, or authenticate anyone.
• Guides for the actual tasks: creating an identifier and maintaining one, which covers the part nobody thinks about until it matters — moving your content without breaking the identifiers other people have published.
• Writing .htaccess rules, and how to test them.
• The rule catalogue. Each rule has a page saying what it is, why it exists, what breaking it actually causes, and how to fix it.
• An FAQ.
• News, which is where you are.

A start on agent support ​

A growing share of contributions here are machine-generated: confident, well-formatted, and wrong. The usual failure is treating the service as a file host, or copying a broken .htaccess from a neighbouring directory on the assumption that a pattern repeated in hundreds of files must be correct.

So there is now something for agents to read. AGENTS.md in the repository is written for them, with CLAUDE.md pointing at it. This site is built with machine-readable output at /llms.txt and /llms-full.txt, and any page is available as raw Markdown by appending .md to its URL.

This is a first pass and it is thin. Agent skills for the common tasks would be genuinely useful — volunteers welcome. Feedback on what is missing is just as welcome.

Coming soon ​

• More documentation.
• More rules.
• Revisions to the rules that are already here, based on feedback.

What would you like to see? Say so at https://github.com/perma-id/w3id.org/issues.

Corrections ​

This site is built from the docs/ directory of the same repository that holds the identifiers, and every page has an edit link at the bottom. If something here is wrong, or was true once and is not any more, that is worth a pull request.