Ok this might be dumb.
Spent a lot of time loking at llms.txt and thinking about content and ai AUTHORSHIP.
So I made identity.txt, does the same thing as llms.txt for people.
The problem: every AI tool has "custom instructions" but they're siloed. Switch tools and you lose everything. Your tone, your expertise, your preferences. You end up re-explaining yourself constantly.
identity.txt is just a markdown file. Same idea as llms.txt, humans.txt, robots.txt. You write it once and it works everywhere. Paste it into ChatGPT, Claude, Gemini, wherever. Or host it at yourdomain.com/identity.txt and link to it.
What's in it:
- Your name (H1 heading)
- Sections like ## Voice (how you write), ## Expertise (what you know), ## Preferences (hard rules)
- A ## Terms section - basically robots.txt for your identity.
We're also experimenting with hosting at identitytxt.org where you sign in with Google and get a permanent URL. But honestly the spec is the point, not the service. Self-hosting works fine.
This is very early and experimental. We're trying to start a conversation about portable identity for AI, not ship a finished product. The spec is CC-BY 4.0 and completely open:
https://github.com/Fifty-Five-and-Five/identitytxt
Would love to know: do you find yourself re-explaining who you are to AI tools? Is a file convention the right answer or is there a better approach?
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