I built a dev diary writes itself

Name: I built a dev diary writes itself
Availability: InStock
Author: lucasmartinic

by lucasmartinic·Jun 16, 2026·1 point·1 comment

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AI Analysis

●●SolidCozyZero to One

Dev diary that writes itself from agent sessions instead of manual standup notes.

Strengths

•Agent-session integration creates narrative entries with tokens, time, and files changed automatically
•Cross-project querying lets you ask what you worked on any date across all repos
•MCP support means agents can read and write to the diary without manual logging

Weaknesses

•Dev time tracking is crowded with WakaTime, GitPrime, and commit history tools
•Requires agent integration - traditional developers without AI workflows get less value

Post Description

Hi HN, I'm Lucas. I mostly build XR things, but over the past month or so I've been developing a tool that became necessary for me: I'm usually working on many different things at once, and I needed a way to create reports and check what I worked on last year on a specific day.

mydev.day is an automatic development diary that writes itself as you build. You connect your agent to it once per project (takes a couple of minutes), and from then on it automatically adds an entry per feature. After that you can query it via the API to ask anything about all your work across projects and accounts, or go to the app to print nice looking charts and reports.

It started as an internal tool, but inspired by the indie hackers I follow, I decided to turn it into a little product to see if it could be helpful for other builders and developers out there!

Fun fact: it was really cool to dogfood it on itself as I built it!