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The Karpathy CLAUDE.md File That 43,000 Developers Installed in 1 Week (Full Breakdown)
Apr 20, 2026
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0:00
Uh, hello guys, in this uh, video I will
0:02
actually show you a Claude MD markdown
0:05
file which is created by a very famous
0:08
software developer. It's called as
0:10
Andrej Karpathy.
0:12
Uh, it's actually a very famous Claude
0:14
markdown file which is created
0:16
specifically for coding and development
0:18
to actually save your Claude tokens.
0:21
So, it's a single Claude markdown file
0:24
to improve Claude code behavior derived
0:26
from this user Andrej Karpathy which is
0:29
a very famous software developer. So,
0:31
you can just see here this is actually
0:32
available on GitHub. It's already
0:35
downloaded by 65,000
0:38
developers so, in a short amount of
0:40
time. So, it just released 2 months ago
0:42
and it's almost got 65,000 GitHub stars.
0:45
So, I have given this link in the
0:47
description of the video. So, it's a
0:49
single Claude Claude markdown file to
0:51
improve the ability of thinking of
0:54
Claude code. So, by default Claude code
0:57
consumes a lot of tokens which actually
1:00
increases your money. It increases the
1:03
cost. So, this developer
1:05
it's he is also on X. You can also
1:07
follow him on X as well.
1:09
So, this is actually a famous developer
1:12
who created this Claude markdown file
1:14
here.
1:15
So, it's a single Claude markdown file
1:18
and many developers are saying that it
1:20
really
1:21
actually boosted their Claude code.
1:23
Personally, I
1:24
also tried this
1:26
and it really was very good. So, as you
1:29
can see he created this
1:33
Claude markdown file
1:36
and shared this on his X which also
1:39
created a lot of hype.
1:44
So,
1:46
you basically go to the description
1:48
link. Simply, you will see this Claude
1:51
markdown file right here.
1:53
Just open this file and simply paste
1:55
everything that is available in Claude
1:57
markdown file inside your own Claude
2:00
code.
2:01
And
2:02
after using this Claude Claude markdown
2:04
file inside your own Claude code, this
2:07
can significantly reduce the amount of
2:09
tokens that your Claude will use.
2:12
Personally, it will reduce the cost as
2:15
well.
2:17
So, it basically gives you the solution
2:20
here. Think It basically applies these
2:22
principles these four principles to
2:25
Claude code. So,
2:27
your Claude code must think before it
2:30
starts coding. So, it basically prevents
2:33
your Claude code from making wrong
2:35
assumptions, hidden confusion, and
2:36
missing trade-offs.
2:38
Simplicity first, over complication,
2:40
bloated abstraction, surgical changes.
2:43
So, it basically apply all these
2:44
principles that it has goal-driven
2:47
execution. So, every time it will
2:49
basically ask
2:51
before making any kind of changes.
2:53
So, once you actually paste this
2:55
markdown file inside your own Claude
2:57
code, it's very easy. Simply open your
3:00
own Claude code wherever you installed
3:02
it
3:03
and simply
3:04
copy everything which is available right
3:06
here or
3:08
simply paste this markdown file inside
3:10
your own Claude code. This will
3:12
significantly will reduce the
3:15
You can recommended way is that you can
3:17
from within your Claude code first add
3:19
the marketplace.
3:21
So, you copy this command.
3:26
So, just install wherever your Claude
3:29
code is there.
3:35
So, simply open your own Claude wherever
3:37
it is present
3:40
and simply
3:43
add this mark
3:45
You can even add this through the plugin
3:47
as well. You can install this plugin.
3:50
Simply, this installs the guidelines of
3:52
the Claude Claude code plugin making the
3:54
skill available across all your
3:56
projects.
3:57
You can even
3:59
use it with cursor as well.
4:01
So, a cursor file is also there. So,
4:04
depending upon your
4:07
coding agent either you can use it for
4:09
cursor or Claude. So, these are
4:11
different skills which are available as
4:13
you can see that.
4:14
You can check out this full
4:16
repo repository. I've given the link in
4:18
the description. This is also available
4:20
for cursor as well.
4:22
I I personally tried this. I can easily
4:26
tell you that it will significantly
4:28
improve the performance level and also
4:30
it will also save a lot of money as well
4:33
because
4:34
it will significantly
4:36
increase the speed as well. So, the link
4:39
is given in the description. Definitely,
4:41
check out this GitHub repo.
4:46
So,
4:48
the installation is given right here.
4:52
You can also use this curl command as
4:54
well to actually add this
4:57
directly by
4:59
doing this.
5:04
So,
5:05
first of all, you need to log in here.
5:13
So, after you log in, you can simply add
5:16
this plugin very simply.
5:21
So, definitely check this out. Uh,
5:28
It's created by this developer Karpathy.
5:31
Single Claude file to improve the Claude
5:33
code behavior.