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OpenProse launch: what they're building and where to launch next

FoxPlug writes launch posts from what a startup ships and matches it to the launch communities that fit it. This page shows what OpenProse is building and where it could launch next; if it is your startup, start free below.

What they're building

An open-source operating system for reliable long-running agents

Batch
Y Combinator Spring 2026
Industry
B2B
Team size
3
Based
San Francisco, CA, USA; Remote

Founders

prose.md ↗

See their funding details ↗

OpenProse on the record

What they shipped

  • From its YC profile: OpenProse is building open-source infrastructure for long-running AI work: a declarative language plus a reactive harness/runtime for reliable agent workflows. (source)
  • Its own site describes it as: "Declare standing AI jobs as Markdown contracts. A deterministic harness runs only what changed, and signs a receipt for every decision." (source)
  • Homepage headline: "Stop scripting agents. Declare them." (source)

Who is behind it

  • Dan Barrett, Founder/CEO: Software engineer of 12 years, agent developer of 5 years, two time founder. Creator of OpenProse. (source)

Pricing and product pages

  • Publishes documentation at https://docs.prose.md. (source)

Code

  • GitHub organization openprose: 14 public repositories, account created 2026-01-02; most starred is prose (1749 stars, TypeScript, MIT licence); last push 2026-09-25. (source)

Timeline

  1. 2026: founded, per its YC profile. (source)

Other B2B software launches on FoxPlug

  • Nebula Security: Autonomous AI defense system for cyber attack
  • NebuSec: Autonomous AI defense system for cyber attack
  • Nex: Claude Cowork for high volume GTM workflows

Where else to launch OpenProse

  • Indie Hackers Forum ↗
    Self-promotion allowed
    Audience: IndieHackers; bootstrapped solo founders sharing revenue and behind-the-scenes
  • Hacker News (Show HN) ↗
    Self-promotion allowed, within the community's rules
    Audience: Hacker News readers; engineers, technical founders, infra-curious people
  • Product Hunt ↗
    Self-promotion allowedFree
  • Demand Curve ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • No Code Founders ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • OnlineGeniuses ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • Product Makers ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • ProductLed ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group

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