Aditya Asgaonkar
@adiasg
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building · prev @ethereum
San Francisco
Joined June 2018
Context engineering is why coding agents are not the best for everything. Take browser use - coding agents keep the DOMs from all visited pages, but you only need the last few.
We’re starting to get a clearer sign of how vast the surface area of context engineering is going to be. To build AI agents, in theory, it should be as simple as having a super powerful model, giving it a set of tools, having a really good system prompt, and giving it access to
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Models diverge beyond just their APIs. Cursor's prompt for GPT-5 differs significantly from Sonnet 4.5 in instructions and tools. GPT-5 gets 668 tokens for TODO management while Sonnet 4.5 gets 71. GPT-5 gets an apply_patch tool while Sonnet gets search_replace.
GPT-5-Codex is a greatest coding model that sucks in independent coding agents. Let's explore the rabbithole of a technical rugpull by frontier labs. For years, there was an unspoken truce. OpenAI and Anthropic shipped models with standard APIs. Easy swaps between providers.
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Reverse engineered Cursor's prompts for GPT-5 and Sonnet 4.5. GPT has a very detailed prescriptive prompt while Sonnet keeps it concise. E.g. GPT has 668 tokens about todo management vs. just 71 for Sonnet!
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You can use Claude Skills with Codex! Just ask Claude to export a list of all skills and put that into AGENTS md
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Ask your agent to do the thing instead of asking it to write software to do the thing
Huh, I guess I went from "agents are meaningless jargon hype that's never going to happen" in January to "Claude Code is a General Agent" in October
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SF, does it have to rain the night of the Parcels concert? 😭
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I started managing guitar tabs in Cursor. Now it makes me customized song sheets! Just the model didn't work well. Had to make an MCP to scrape tabs for context collection.
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Cursor + browser use is amazing! Here it's testing whether sidebar state persists after page refresh:
Cursor can now control your browser. Agent can take screenshots, improve UI, and debug client issues. Try our early preview with Sonnet 4.5.
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npm install prompt-canvas & place a <PromptCanvas /> component in your React layout. Draw your changes, then copy-paste image in your coding agent!
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Visual prompts for coding agents directly from your frontend. Works with Cursor, Codex, and Claude Code! 🔗⬇️ Started as a quick hack at the Cursor office - thanks @benln @ericzakariasson @leerob for the credits 😁
Change the frontend by drawing on it! Too often I end up prompting "change the thing to the right of X". Drawings make it easy to specify :) Thanks for hosting @benln @ericzakariasson @leerob
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Make UI changes by drawing! Draw, copy, paste in coding agent. Let me know if you'd use this - releasing as a plug & play React component soon.
Change the frontend by drawing on it! Too often I end up prompting "change the thing to the right of X". Drawings make it easy to specify :) Thanks for hosting @benln @ericzakariasson @leerob
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annotate your screen and let background agents just do the work @adiasg . love this use case
Change the frontend by drawing on it! Too often I end up prompting "change the thing to the right of X". Drawings make it easy to specify :) Thanks for hosting @benln @ericzakariasson @leerob
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Change the frontend by drawing on it! Too often I end up prompting "change the thing to the right of X". Drawings make it easy to specify :) Thanks for hosting @benln @ericzakariasson @leerob
Cursor users building together with the team in our office Thank you to everyone who came out last night!
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