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Codex builds a blog inside an existing Datasette site

Willison published the Codex session used to build the Datasette project blog. The agent inspected the existing site, moved conflicting database routes and implemented blog behavior with local checks.

Added gist.github.comAgent: Codex
TRY A BOUNDED VERSION

Prompt to try

Editorial adaptation, not the source author’s exact prompt. Replace bracketed inputs and review tool permissions first.

Add [content section] to this existing site. First trace URL conflicts and all callers of any route you must move. Implement a small slice using current conventions, verify local routes and preserve redirects where required. Present checks and a diff; stop before publishing.

What happened

The session documents implementation and local checks; Willison separately announced the new project blog.

Reported by Simon Willison — published Codex session

How the agent did it

  1. Inspect repository dependencies and verify a working local development server.
  2. Move the existing blog database route to free the desired path while updating callers.
  3. Implement the new blog in the existing site and run local verification.

Where a person stepped in

Willison directed routing and product choices throughout the published session.

A person approved each step before the agent continued.

More details

About this account

Codex traced route dependencies and edited related files, using commands and checks to guide implementation.

Publicly linked by the author from his May 13 blog. The transcript is deployment evidence; agent statements alone are not independent validation.

Credit: Simon Willison — published Codex session

Source published 13 May 2026

Source checked 14 Oct 2026

Tools and topics

Codex Desktop · Datasette · Python · uv · Git · curl

Code · Testing

Editorial completeness: 100/100. Measures documented fields, not agent performance or verified outcomes.

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