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YC Demo Day Spotlights AI Domain-Specific Harnesses

Attendees at YC Demo Day share observations on X about AI project trends.

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21 Sources, 21d ago, first seen 21d ago

TLDR

Jessy posted from Y Combinator's Summer 2026 Demo Day that most projects besides hardware were building domain-specific harnesses. Garry Tan replied with the line: "Either you die a system of record or you live long enough to become a domain-specific harness." Ivan Chebykin replied that you live long enough to become a skill. Jerome Tomasini called the harnesses the next generation of vertical SaaS. Natalie Khalil asked when the tools stopped being called wrappers. Other replies wished for a harness or questioned YC's project focus.

Combined views

3M

21 Sources, first seen 21d ago

24.2K likes1.1K comments21.4K saves1.3K reposts

Combined views

3M

21 Sources, first seen 21d ago

24.2K likes1.1K comments21.4K saves1.3K reposts
YC Demo Day Spotlights AI Domain-Specific Harnesses

Sentiment

Positive82.1%17.9%Negative

Based on 28 sentiment-bearing replies from 28 accounts across 2 conversations.

Sentiment

Positive82.1%17.9%Negative

Based on 28 sentiment-bearing replies from 28 accounts across 2 conversations.

21 Sources

@goodhartproofI was just at YC demo day yesterday. Besides hardware/physical things, everyone is just basically just building a domain-specific harness21d
@amphib0ly@goodhartproof i wish someone would build me a domain-specific harness21d
@garrytanEither you die a system of record or you live long enough to become a domain-specific harness20d
@luvtiggies@garrytan How come YC doesn't focus on projects that help less technical parts of society leverage technology to its benefit? I know of some good projects that kept getting passed over.20d
@natalienkhalilWhen did we stop calling these wrappers?20d
@ichebykin@garrytan @jordanjhamel you live long enough to become a skill20d
@JeromeTomasiniDomain-specific harnesses are the next generation of vertical SaaS: from software you work in to software that does the work!20d
@fiddybps1yeh we're about 6 months ahead of everyone else @DimeTerminal for the win!20d
@unclebobmartinMorning Bathrobe Rant: Rethinking Harnesses.20d
@minchoiOpenAI just made it stupidly easy to build real AI agents. The new Agents API basically gives developers the Codex harness as an API: • One call → cloud agent • Long-running sessions • Automatic context compaction • Parallel subagents • MCP + built-in tools • OpenAI-hosted sandboxes • Or run on your own infra This is way more than "call a model and hope." You give it a task, model, tools + environment. It can work across files, run code, use tools, delegate work to subagents and keep going across multiple context windows. Public beta is live for all developers. No extra Agents API fee - you pay for the models + tools your agent uses. This is basically Codex infrastructure for anyone building agents.20d
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    21 Sources

    @goodhartproofI was just at YC demo day yesterday. Besides hardware/physical things, everyone is just basically just building a domain-specific harness21d
    @amphib0ly@goodhartproof i wish someone would build me a domain-specific harness21d
    @garrytanEither you die a system of record or you live long enough to become a domain-specific harness20d
    @luvtiggies@garrytan How come YC doesn't focus on projects that help less technical parts of society leverage technology to its benefit? I know of some good projects that kept getting passed over.20d
    @natalienkhalilWhen did we stop calling these wrappers?20d
    @ichebykin@garrytan @jordanjhamel you live long enough to become a skill20d
    @JeromeTomasiniDomain-specific harnesses are the next generation of vertical SaaS: from software you work in to software that does the work!20d
    @fiddybps1yeh we're about 6 months ahead of everyone else @DimeTerminal for the win!20d
    @unclebobmartinMorning Bathrobe Rant: Rethinking Harnesses.20d
    @minchoiOpenAI just made it stupidly easy to build real AI agents. The new Agents API basically gives developers the Codex harness as an API: • One call → cloud agent • Long-running sessions • Automatic context compaction • Parallel subagents • MCP + built-in tools • OpenAI-hosted sandboxes • Or run on your own infra This is way more than "call a model and hope." You give it a task, model, tools + environment. It can work across files, run code, use tools, delegate work to subagents and keep going across multiple context windows. Public beta is live for all developers. No extra Agents API fee - you pay for the models + tools your agent uses. This is basically Codex infrastructure for anyone building agents.20d
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