Kronos MCP server

Kronos

A memory for your AI assistant, kept on your machine. Every conversation you've had, kept and searchable. The ones that matter now, brought up on their own.

Why

AI assistants forget. Every conversation starts from nothing: the trip you planned last week, the budget you set, the injury you mentioned, the job you applied for, the problem you already solved. Unless you say it again, it's gone.

That's the difference between a chat box and an assistant. An assistant remembers what you've told it, notices when something you say connects to something from before, and doesn't make you repeat yourself.

Kronos gives an assistant that memory. It keeps every conversation you have, indexes it, and gives each memory a temperature. Recent and often-used memories are hot. When something you say connects to one of them, Kronos quietly hands the assistant a short note about it before it answers. Old memories cool down and stop interrupting, but nothing is ever deleted: anything can be found again by searching, or by opening the calendar to the day it happened.

It runs entirely on your machine. Nothing is uploaded, and it works with any assistant that can use tools.

What it's like

You mention your knee is sore after a workout. You told your assistant two weeks ago that lunges hurt it, and it suggested step-ups instead. Without Kronos, that conversation is gone. With Kronos, the assistant sees this next to your message:

kronos: possibly relevant past conversations (kronos read ID for more)
#2 2026-09-27 health · Knee hurts on lunges, what should I swap Swap lunges for step-ups to a low box…

So it answers knowing the history: "Still the left knee from lunges? Did the step-ups help?"

Say "thanks, that's perfect" and Kronos adds nothing. Most messages get nothing. It only speaks up when something actually connects.

And you can ask it directly:

• "Where did we decide to stay in Lisbon?"
• "What was I working on on the 24th?"
• "What did we set the grocery budget to?"
• "Forget that last message, it had my password in it."

What it does

machine, even after the app that created it cleans up its own history.

• Keeps everything. Every conversation is kept in a private vault on your

conversations on the same topic. If one clears the bar, the assistant gets up to three one-line notes. If nothing does, it gets nothing.

• Brings up what matters, unasked. On every message, Kronos looks for past

what you were last doing in the same place, if it was recent.

• Picks up where you left off. Starting a conversation brings a short note of

it is used. Hot memories come up on their own, warm ones on a strong match, cold ones only when searched for. Nothing is deleted.

• Lets memories cool. Each memory's temperature halves every two weeks unless

talked about.

• Has a calendar. Every conversation, by day. Open any day and see what you

through MCP, the standard way assistants use tools.

• Gives the assistant tools to search, read, browse the calendar and forget,

temperature, and a reader. It takes on your system's theme.

• Gives you a window. A small app with the calendar, search, your memory's

background, no internet. One 4.6 MB program.

• Costs almost nothing. No AI model of its own, no GPU, nothing running in the

How it works

conversations ──▶ vault ──▶ exchanges ──▶ search index
                                               │
                 your message ──▶ recall ◀─────┤ temperature
                                    │          │
                     three notes or nothing    └──▶ search · read · calendar

The vault

Shortened. The full README is on GitHub.