
Founded @careswitch to advance home care. Product eng at early-stage startups. CS @ MIT. Purveyor of paralipomena.
New Jersey
Joined October 2008
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Mark Fayngersh retweeted
In asked GPT-6 Astra in Codex to build RuneScape and deploy it to a ChatGPT Site.
You can check out the game here (it is multiplayer, so I'll see you in there!): elderwood-realms.rohannvarma…
The most impressive part may be that the demo video below is an Astra one-shot. My prompt: "I want to make a nice 30 second video that will perform well on twitter, show casing the game that we created here - could you make that video?"
I’m sunsetting svelte-check-rs in favor of official svelte-check.
Thank you @dummdidumm_ for pushing native checking upstream and crediting this project as an inspiration, @rauchg for the launch shout-out, and everyone who contributed! Had a lot of fun working on it ❤️
svelte-check-rs.vercel.app/
Mark Fayngersh retweeted
We've partnered with SpaceXAI to train Grok 4.5.
It’s our most powerful model yet and the first we've built for more than software engineering.
In case the Claude Code team (@bcherny @trq212) sees this 👀 I love the tool, my single biggest ask for the next model update is even less reward hacking please! Example: when reviewing commits, if a git diff gets truncated, Claude often just reviews the partial output instead of reading the full contents (despite the tool output file properly being created and returned to the agent). I've resorted to writing "IMPORTANT: Never review based on truncated output" in my docs and skills. Would love a model where that level of thoroughness is increasingly the default instinct 🙏
Mark Fayngersh retweeted
Excited to share what we've been building @a____t____g !
Introducing Autonomous — a superintelligent financial advisor at 0% advisory fees.
We’re democratizing the tools and strategies used by the ultra-wealthy and making them available to everyone.
becomeautonomous.com
It's January 3rd and I think I've already peaked for 2026. Built this to speed up my own workflow, never imagined this. Thank you @rauchg for the shout-out! 🙏
A 10x-30x faster 𝚜𝚟𝚎𝚕𝚝𝚎-𝚌𝚑𝚎𝚌𝚔 in Rust just dropped, built with Claude Code and Codex CLI by @pheuter. The motivation was to make agents themselves more efficient. 2026 is about to be wild 😄
svelte-check-rs.vercel.app/
40 seconds → 1.3 seconds
I built a 30x faster svelte-check in 2 days using AI.
Now Codex and Claude Code can iterate on our production SvelteKit codebase without waiting forever to verify their changes.
@dummdidumm_ would love your thoughts!
svelte-check-rs.vercel.app/
The Claude Agent SDK is incredibly powerful, but you need a terminal and dev tools to use it.
So I built Claude Agent Desktop, a thin wrapper around the Claude Agent SDK and Skills for macOS/Windows. Node, Python, Git, and bash tools are bundled. Work happens in a shared Desktop folder—drag in your files, the agent builds and creates alongside you.
Analysts, operators, marketers can now use full agent capabilities without touching the terminal.
github.com/pheuter/claude-ag…
/cc @alexalbert__ @trq212 @_catwu would love your thoughts ❤️
in 1977 we etched a few fragile grooves and flung them into space: greetings, a baby’s cry, Bach against the void. it was all we could carry.
a few short years later, we’ve taught the grooves to sing back.
horizon alpha is our new golden record. open, living, vast. not a handful of sounds but a chorus of all we know and all we’re learning. from vinyl to vectors, from a hello in the dark to a lantern you can hold.
we are here. we are listening. this time we are handing you the needle. press play.
We've come a long way since "As an AI I cannot read books..."
Amazing update 👏 @aidan_mclau
Mark Fayngersh retweeted
help me fix get-4o slop
reply with examples of slop behavior
just a single sentence nothing crazy
what annoys you
what makes you wanna frisbee your laptop into a river
i'll respond to every comment
rt so we can maximize slop feedback
help me de-sloptimize our models
go
Impressive how we're getting genuine X-Files vibes from these NJ drone sightings. In an era where every phone is basically the Hubble telescope, something's actually staying mysterious. Roswell walked so these drones could run.
This @DOGE proposal would transform caregiving from a poverty trap into a viable career path. For the many women of color who serve as home health aides and CNAs, raising Medicaid income thresholds means being able to work more hours without losing vital benefits. Smart policy that uplifts both caregivers and patients.
Here's my contribution to @DOGE. Welcome any feedback. Let me know what you think @elonmusk @VivekGRamaswamy. Probably the one time increasing an entitlement stands to save vastly more than it costs.
America’s caregiving crisis is a looming disaster—and we need bold solutions to fix it.
Here’s the problem: The poor (caregivers) are caring for the sick (Medicaid recipients), but the system is failing both. Home health aides and CNAs are critically underpaid, and we don’t have enough of them to meet current demand—let alone the exploding need from the aging baby boomer population, aka the “silver tsunami.”
Worse, many caregivers actively limit their hours because of the benefits cliff. If they earn just a little more, they lose vital safety nets like Medicaid. This disincentive doesn’t just hurt caregivers—it undermines the entire healthcare system.
The Cost of the Current System
Medicaid is already the largest payer of long-term care in the U.S., spending $592 billion annually, including $213 billion on dual-eligibles (individuals on both Medicaid and Medicare). Yet, poor caregiver support drives up costs by forcing more seniors into expensive institutional care (nursing homes) and leading to avoidable acute episodes like ER visits and hospitalizations.
For perspective:
• Nursing homes cost Medicaid ~$102,000 per year per person.
• Home care? Just ~$27,000 per year.
Every person we keep out of institutional care saves Medicaid ~$75,000 annually.
Similarly, dual-eligibles with better preventative care experience fewer hospitalizations, reducing Medicare costs significantly. A 5-10% reduction in acute care episodes across these programs could save tens of billions of dollars annually.
The Solution: Raise Medicaid Income Thresholds for Caregivers
Here’s a simple but transformative idea: Raise the Medicaid income threshold specifically for caregivers who serve Medicaid recipients. This would:
1. Unlock workforce capacity: Many caregivers would work more hours if they didn’t fear losing benefits. Even a modest increase in hours from 30% of the current 2.3M caregiver workforce could add 345,000 full-time equivalents to the field.
2. Attract new caregivers: Reducing the benefits cliff makes caregiving a more viable career path, helping grow the workforce at a critical time.
3. Improve care outcomes: More available caregivers mean better care quality, fewer acute episodes, and lower reliance on high-cost institutional care.
4. Cut taxpayer costs: These changes would pay for themselves by reducing long-term Medicaid and Medicare expenses tied to poor caregiving availability.
Quantifying the Impact
• Current caregivers working more hours: Unlocking just 25% more hours from 30% of caregivers would create an equivalent of 345,000 new full-time caregivers.
• New caregivers entering the field: If only 5% more workers (115,000) join due to improved income thresholds, the workforce expands further, alleviating shortages.
• Reduced institutional reliance: Shifting just 10% of institutional care recipients (~200,000) to home-based care saves Medicaid $15 billion/year.
• Lower acute care costs: Reducing hospitalizations and ER visits among Medicaid and dual-eligibles by 5-10% could save $10-20 billion annually.
The Long-Term Payoff
This policy would stabilize caregivers, improve outcomes for seniors, and deliver billions in taxpayer savings annually. It’s not just the right thing to do—it’s the smart thing to do.
Other Considerations and Research Needs
Caregivers often also rely on programs like SNAP and Section 8. Simply raising Medicaid income thresholds may not suffice if higher earnings from additional hours don't surpass the added costs that arise from losing these benefits, leaving them worse off. Research should explore:
• How multiple benefits interact with income changes.
• Regional cost-of-living impacts.
• Whether income increases offset housing and food costs.
To ensure success, policymakers might need to smooth benefit cliffs across programs or provide targeted subsidies in high-cost areas.
in the crawlspace between purpose and void
we cultivate our elegant despair
(Onegin's ghost plays cards with Pechorin
while Stavrogin watches, lips curled—
their reflections fade in smartphone screens)
we are masters of the peripheral game:
too clever for faith
too weary for rebellion
too proud for contentment
our fathers built empires of steel and steam
we build empires of digital vapor
and ironic distance
in Saint Petersburg drawing rooms
we discussed the revolution
in Manhattan coffee shops
we discuss the simulation
the same poisoned intelligence
the same paralysis of possibility
we roll cigarettes with pages torn from
manifestos we never quite believed in
each exhale carries the smoke of
abandoned causes
between Instagram stories
we contemplate the void
(but make it aesthetic)
our grandfathers knew how to die for something
our fathers knew how to live for something
we know only how to observe—
with perfect wit
with cutting insight
with endless commentary
in the mirror: a curator of experiences
never quite experienced
time flows around us like water
around a perfectly useless stone
we are the children of Bazarov
born too late for nihilism
too early for whatever comes next
suspended in the amber
of our own awareness
this is how the world ends:
not with Pechorin's duel
but with a carefully crafted tweet
about the futility of duels
(sent from our deathbeds
which we'll review on Yelp—
three stars for existential comfort
two for authenticity)
In order for society to truly embrace the challenge of building AI systems that align with our goals and values, we must first reckon with perennial questions about human morality and ethics: markfayngersh.com/posts/the-…














