Kevin Kern
@kevinkern.dev
Teaching & building AI apps to reduce the workload
📓 Building instructa.ai Academy
Curated Ai Prompts instructa.ai/en/ai-prompts
🇺🇦 Raised 20k for UA
👨💻 coder & design
Website: kevinkern.dev
📍 Vienna, Austria
📓 Building instructa.ai Academy
Curated Ai Prompts instructa.ai/en/ai-prompts
🇺🇦 Raised 20k for UA
👨💻 coder & design
Website: kevinkern.dev
📍 Vienna, Austria
TIL: ChatGPT can create simple sound files for you (I was looking for free sounds for codex-1up).
November 12, 2025 at 7:32 PM
TIL: ChatGPT can create simple sound files for you (I was looking for free sounds for codex-1up).
A fresh codex-1up update is out.
- Quick install "npm install -g codex-1up"
- Add custom sounds when a task is finished
- Guided setup (easy for beginners)
- Lot of cleanup, improvements
- New updated profiles to start quickly
- Quick install "npm install -g codex-1up"
- Add custom sounds when a task is finished
- Guided setup (easy for beginners)
- Lot of cleanup, improvements
- New updated profiles to start quickly
November 11, 2025 at 7:31 PM
A fresh codex-1up update is out.
- Quick install "npm install -g codex-1up"
- Add custom sounds when a task is finished
- Guided setup (easy for beginners)
- Lot of cleanup, improvements
- New updated profiles to start quickly
- Quick install "npm install -g codex-1up"
- Add custom sounds when a task is finished
- Guided setup (easy for beginners)
- Lot of cleanup, improvements
- New updated profiles to start quickly
in the next version of codex-1up, a new fast guided setup.
November 10, 2025 at 10:19 PM
in the next version of codex-1up, a new fast guided setup.
A new stealth model, polaris-alpha, has appeared on openrouter. Time to give it a try.
November 9, 2025 at 12:14 AM
A new stealth model, polaris-alpha, has appeared on openrouter. Time to give it a try.
To explain: With better models and a codebase that serves as context you can just talk to the model.
The less context you have, the more specific your prompt should be.
The less context you have, the more specific your prompt should be.
November 7, 2025 at 1:19 PM
To explain: With better models and a codebase that serves as context you can just talk to the model.
The less context you have, the more specific your prompt should be.
The less context you have, the more specific your prompt should be.
My earlier take is deprecated.
November 7, 2025 at 1:19 PM
My earlier take is deprecated.
I've updated today the tanstack starter project + agent rules. You can build now quickly web apps with one the best web dev stack available.
November 6, 2025 at 9:10 AM
I've updated today the tanstack starter project + agent rules. You can build now quickly web apps with one the best web dev stack available.
f you use composer-1 in cursor for coding, it's helpful to run a quick /code-review to identify any code smells.
In my case I use a slash command with gpt-5. Usually you find some flaws in the final implementation.
In my case I use a slash command with gpt-5. Usually you find some flaws in the final implementation.
November 6, 2025 at 2:31 AM
f you use composer-1 in cursor for coding, it's helpful to run a quick /code-review to identify any code smells.
In my case I use a slash command with gpt-5. Usually you find some flaws in the final implementation.
In my case I use a slash command with gpt-5. Usually you find some flaws in the final implementation.
Finally I found a way to 10x codex! Sound on! 🔊
November 5, 2025 at 6:43 AM
Finally I found a way to 10x codex! Sound on! 🔊
5/ Better Code Review
You can now view all changes from Agent across multiple files in one place, without switching between files.
You can now view all changes from Agent across multiple files in one place, without switching between files.
November 3, 2025 at 1:29 PM
5/ Better Code Review
You can now view all changes from Agent across multiple files in one place, without switching between files.
You can now view all changes from Agent across multiple files in one place, without switching between files.
4/ Git worktree and best-of-n selection
We have seen this in codex before. Cursor generates multiple versions of a task so you can pick the best one.
We have seen this in codex before. Cursor generates multiple versions of a task so you can pick the best one.
November 3, 2025 at 1:29 PM
4/ Git worktree and best-of-n selection
We have seen this in codex before. Cursor generates multiple versions of a task so you can pick the best one.
We have seen this in codex before. Cursor generates multiple versions of a task so you can pick the best one.
3/ Browser Mode
This is a good one for designers and frontend-devs
- You can now open an inline browser and directly select the elements you want to edit.
- The @ browser command is helpful to access and chat with your site/app and test your changes live.
This is a good one for designers and frontend-devs
- You can now open an inline browser and directly select the elements you want to edit.
- The @ browser command is helpful to access and chat with your site/app and test your changes live.
November 3, 2025 at 1:29 PM
3/ Browser Mode
This is a good one for designers and frontend-devs
- You can now open an inline browser and directly select the elements you want to edit.
- The @ browser command is helpful to access and chat with your site/app and test your changes live.
This is a good one for designers and frontend-devs
- You can now open an inline browser and directly select the elements you want to edit.
- The @ browser command is helpful to access and chat with your site/app and test your changes live.
2/ New Agent Window
It's specifically designed to work with agents. Optimized for setups involving multiple agents like worktrees or controlling browsers.
It's specifically designed to work with agents. Optimized for setups involving multiple agents like worktrees or controlling browsers.
November 3, 2025 at 1:29 PM
2/ New Agent Window
It's specifically designed to work with agents. Optimized for setups involving multiple agents like worktrees or controlling browsers.
It's specifically designed to work with agents. Optimized for setups involving multiple agents like worktrees or controlling browsers.
1/ New composer-1-alpha model
What I've experienced so far:
- It's unbelievable FAST (similar to cheetah).
- The model is tightly bound to the codebase; questions outside it are likely dropped while codebase specific info takes priority.
- Works great for non coding tasks too (docs, specs, e.g.)
What I've experienced so far:
- It's unbelievable FAST (similar to cheetah).
- The model is tightly bound to the codebase; questions outside it are likely dropped while codebase specific info takes priority.
- Works great for non coding tasks too (docs, specs, e.g.)
November 3, 2025 at 1:29 PM
1/ New composer-1-alpha model
What I've experienced so far:
- It's unbelievable FAST (similar to cheetah).
- The model is tightly bound to the codebase; questions outside it are likely dropped while codebase specific info takes priority.
- Works great for non coding tasks too (docs, specs, e.g.)
What I've experienced so far:
- It's unbelievable FAST (similar to cheetah).
- The model is tightly bound to the codebase; questions outside it are likely dropped while codebase specific info takes priority.
- Works great for non coding tasks too (docs, specs, e.g.)
Cursor 2.0 update and their new agentic model "composer-1-alpha"
I've been testing it for a few days and have put together a full summary in the thread below.
Click to see whats new 🧵
I've been testing it for a few days and have put together a full summary in the thread below.
Click to see whats new 🧵
November 3, 2025 at 1:29 PM
Cursor 2.0 update and their new agentic model "composer-1-alpha"
I've been testing it for a few days and have put together a full summary in the thread below.
Click to see whats new 🧵
I've been testing it for a few days and have put together a full summary in the thread below.
Click to see whats new 🧵
This script plays a sound when Codex finishes your task.
October 31, 2025 at 7:42 AM
This script plays a sound when Codex finishes your task.
If you work in a larger company and your team uses Jira, I can recommend the "mcp-atlassian" MCP.
It's probably the only MCP I'm currently using.
I fetch all stories for a given epic in markdown, including the specification stored in confluence and export the figma screens.
It's probably the only MCP I'm currently using.
I fetch all stories for a given epic in markdown, including the specification stored in confluence and export the figma screens.
October 30, 2025 at 7:24 PM
If you work in a larger company and your team uses Jira, I can recommend the "mcp-atlassian" MCP.
It's probably the only MCP I'm currently using.
I fetch all stories for a given epic in markdown, including the specification stored in confluence and export the figma screens.
It's probably the only MCP I'm currently using.
I fetch all stories for a given epic in markdown, including the specification stored in confluence and export the figma screens.
I've put together a collection of slash commands I use with Codex and Cursor. ⚡
Link in the comments
Link in the comments
October 14, 2025 at 3:06 PM
I've put together a collection of slash commands I use with Codex and Cursor. ⚡
Link in the comments
Link in the comments
The new Plan mode in Cursor is well thought out.
It builds on the existing task lists, showing they iterate on what’s already there and bring features together instead of shipping separate ones. I like that approach.
It builds on the existing task lists, showing they iterate on what’s already there and bring features together instead of shipping separate ones. I like that approach.
October 13, 2025 at 10:18 AM
The new Plan mode in Cursor is well thought out.
It builds on the existing task lists, showing they iterate on what’s already there and bring features together instead of shipping separate ones. I like that approach.
It builds on the existing task lists, showing they iterate on what’s already there and bring features together instead of shipping separate ones. I like that approach.
Yeah, 3-5 days feels realistic without AI.
October 12, 2025 at 4:38 PM
Yeah, 3-5 days feels realistic without AI.
Cheetah is such a beast model. refactor to a monorepo, including smoke tests & CLI updates, in just a few minutes.
October 12, 2025 at 4:38 PM
Cheetah is such a beast model. refactor to a monorepo, including smoke tests & CLI updates, in just a few minutes.
Ok reasoning has to be set afterwards.
October 8, 2025 at 11:02 AM
Ok reasoning has to be set afterwards.
Codex CLI Model selector looks clean now.
It seems that the configs for model_reasoning_effort (low, medium, high) are still available.
It seems that the configs for model_reasoning_effort (low, medium, high) are still available.
October 8, 2025 at 11:02 AM
Codex CLI Model selector looks clean now.
It seems that the configs for model_reasoning_effort (low, medium, high) are still available.
It seems that the configs for model_reasoning_effort (low, medium, high) are still available.
Look, the final boss spawned in Cursor.
October 8, 2025 at 10:35 AM
Look, the final boss spawned in Cursor.