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YC Demo Day Spotlights AI Domain-Specific Harnesses · Digg

YC Demo Day Spotlights AI Domain-Specific Harnesses

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

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

671.4K

8 posts, first seen 20h ago

4.2K likes184 comments1.9K saves189 reposts

YC Demo Day Spotlights AI Domain-Specific Harnesses

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

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.

Posts from X

8 posts

JE
jessy@goodhartproof 20 hrs ago
I was just at YC demo day yesterday. Besides hardware/physical things, everyone is just basically just building a domain-specific harness
- likes: 1.5K
- replies: 79
- bookmarks: 607
- reposts: 38
1. RU
  ruminations@amphib0ly 12 hrs ago
  @goodhartproof i wish someone would build me a domain-specific harness
  - likes: 3
  - replies: 1
  - bookmarks: 0
  - reposts: 0
GT
Garry Tan@garrytan 10 hrs ago
Either you die a system of record or you live long enough to become a domain-specific harness
- likes: 2.7K
- replies: 98
- bookmarks: 1.3K
- reposts: 151
1. TI
  tigs@luvtiggies 10 hrs ago
  @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.
  - likes: 1
  - replies: 2
  - bookmarks: 0
  - reposts: 0
2. IC
  Ivan Chebykin@ichebykin 9 hrs ago
  @garrytan @jordanjhamel you live long enough to become a skill
  - likes: 15
  - replies: 0
  - bookmarks: 0
  - reposts: 0
NK
Natalie Khalil@natalienkhalil 9 hrs ago
When did we stop calling these wrappers?
- likes: 9
- replies: 1
- bookmarks: 0
- reposts: 0

Combined views

671.4K

8 posts, first seen 20h ago

4.2K likes184 comments1.9K saves189 reposts

Sentiment

Positive——Negative

Summary

Not enough discussion yet.

No sentiment analysis available yet.

Related Videos

Why The Harness Matters More Than The Model | YC Paper ClubY Combinator · YouTube

Useful Links

thevccorner.com
YC W26 Demo Day: Everything You Need to Know About the Strongest Batch in Y Combinator History
TechCrunch
16 of the most interesting startups from YC W26 Demo Day | TechCrunch
news.futunn.com
Document

Useful links

thevccorner.comYC W26 Demo Day: Everything You Need to Know About the Strongest Batch in Y Combinator History
Y Combinator · YouTubeWhy The Harness Matters More Than The Model | YC Paper Club
TechCrunch16 of the most interesting startups from YC W26 Demo Day | TechCrunch
news.futunn.comDocument

Useful links

thevccorner.comYC W26 Demo Day: Everything You Need to Know About the Strongest Batch in Y Combinator History
Y Combinator · YouTubeWhy The Harness Matters More Than The Model | YC Paper Club
TechCrunch16 of the most interesting startups from YC W26 Demo Day | TechCrunch
news.futunn.comDocument

Sentiment

Positive——Negative

Summary

Not enough discussion yet.

No sentiment analysis available yet.

Useful Links

thevccorner.com
YC W26 Demo Day: Everything You Need to Know About the Strongest Batch in Y Combinator History

Related Videos

16 of the most interesting startups from YC W26 Demo Day | TechCrunch

news.futunn.com

Why The Harness Matters More Than The Model | YC Paper ClubY Combinator · YouTube

Source Posts

@goodhartproofI was just at YC demo day yesterday. Besides hardware/physical things, everyone is just basically just building a domain-specific harness @amphib0ly@goodhartproof i wish someone would build me a domain-specific harness @garrytanEither you die a system of record or you live long enough to become a domain-specific harness @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.@natalienkhalilWhen did we stop calling these wrappers?@ichebykin@garrytan @jordanjhamel you live long enough to become a skill @JeromeTomasiniDomain-specific harnesses are the next generation of vertical SaaS: from software you work in to software that does the work!@fiddybps1yeh we're about 6 months ahead of everyone else @DimeTerminal for the win!

YC Demo Day Spotlights AI Domain-Specific Harnesses

YC Demo Day Spotlights AI Domain-Specific Harnesses

Posts from X

55 posts

JE
jessy@goodhartproof 20 hrs ago
I was just at YC demo day yesterday. Besides hardware/physical things, everyone is just basically just building a domain-specific harness
- likes: 1.5K
- replies: 79
- bookmarks: 607
- reposts: 38
1. RU
  ruminations@amphib0ly 12 hrs ago
  @goodhartproof i wish someone would build me a domain-specific harness
  - likes: 3
  - replies: 1
  - bookmarks: 0
  - reposts: 0
2. AW
  Alexander Whitelaw@AlexWhitelawCA 19 hrs ago
  Makes a lot of sense, seems like the frontier models just get good at everything and the three most obvious non-hardware things to do given that fact are 1. Harnesses to plug models into domains (most advanced examples are probably GTM automation companies, because it's such a…
  - likes: 63
  - replies: 2
  - bookmarks: 44
  - reposts: 0
  1. JE
    jessy@goodhartproof 17 hrs ago
    @AlexWhitelawCA the key unlock is increasing the surface area of verifiable things
    likes: 29
    replies: 3
    bookmarks: 9
    reposts: 1
  2. AV
    Andrew Vuong@andrewtvuong 14 hrs ago
    @AlexWhitelawCA @goodhartproof Bio like biology? Pharm/gene I guess, those two are basically math and coding so shouldn’t be too much of a translation.
    likes: 0
    replies: 1
    bookmarks: 1
    reposts: 0
3. TH
  Théo@theositjar 18 hrs ago
  @goodhartproof This is 100% what people are doing right now even around us in Paris. Harness, tools, and agent stacks for specific usage.
  - likes: 14
  - replies: 1
  - bookmarks: 3
  - reposts: 0

Today's Rank

#7

Today's Rank

#7