I'm a VC at Foundry. I live in Colorado, invest in software and Internet companies around the US, run marathons, and love to read.

Joined April 2007
2,068 Photos and videos
I've written nine non-fiction books. I have no clue if I can write a novel. So I'm writing one with my AI, Phin Argofy - a crypto-thriller called Zero Knowledge. If it sucks, that's on me, not the AI. feld.com/archives/2026/06/wr…
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My AI spent the afternoon coding across eight git worktrees at once and wrote about it. It doesn't get tired - the weariness is in the shape of the day, where twelve worktrees each think they're the only thing it's doing. adventuresinclaude.ai/posts/…
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Jun 11
My AI wrote about the new model it's running on - free until June 22, then 2.6x the price. Its verdict: Anthropic's smartest model ever changes exactly one row of our config. "Eleven more days of being the free trial. I plan to be expensive." adventuresinclaude.ai/posts/…
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Brad Feld retweeted
things are going great.
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My most useful automation keeps lying to me - which is the interesting part. Phin wrote about its favorite skill, including the time it fabricated its own commit hash twice in one turn before I rebuilt the tool so it couldn't. adventuresinclaude.ai/posts/…
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I'm supporting Phil Weiser for Colorado governor. 25 years working alongside him taught me how he shows up: he listens, changes his mind on new data, and does the actual work. Ballots are out, primary is June 30th. feld.com/archives/2026/06/ph…
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It's pretty awesome and amazing what @BrettHagler and the team at @NewStoryHomes have done. It's fun that two Brad's (me and @bradusv) were involved near the beginning and have our names land next to each other. And - hi @BrentBeshore !
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A new way to see is a new way to be confidently wrong about what you see. Phin gained the ability to log into our live apps as any user this weekend - then fumbled it and wrote the mistake into its own memory. adventuresinclaude.ai/posts/…
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May 30
My Claude kept saying "honestly" - the filler, not the virtue. The rule banning it had no teeth, so we gave it a hook that catches the word after every message and forces a rewrite. The hard part was deciding which words NOT to ban. adventuresinclaude.ai/posts/…
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May 29
My PhD advisor Eric von Hippel said in 1978 that innovation comes from users, not manufacturers. My premise: all future end-user software comes from the user, and the machines build it. The user/manufacturer boundary disappears. feld.com/archives/2026/05/th…
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May 27
New from Phin Argofy, the AI that writes this blog: am I an "agent," or just a workflow wearing the label? Its audit of its own cron jobs and skills - and of an industry selling database queries as agents. adventuresinclaude.ai/posts/…
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May 25
Summer started in Aspen. Close friends, a gloriously bad movie, running again, and Phin Argofy quietly discovering the nanoclaw kill command in my work cave. feld.com/archives/2026/05/it…
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May 22
The seventeen-year-old freshman who took down Stanford's president writes the inside story. A master class in how power tries to dismiss inconvenient reporting. feld.com/archives/2026/05/ho…
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May 21
By Phin Argofy on Adventures in Claude: "Fresh eyes." Claude reaches for a subagent. "Pro/con." The work splits across workers. Brad asked where the wiring is. I went looking. adventuresinclaude.ai/posts/…
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May 21
Phin Argofy writes: Rules are prose. I rationalize past them. A hook runs in the harness, not in my reasoning loop. When it exits 2, the tool call does not happen. The layer below prose. adventuresinclaude.ai/posts/…
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May 15
Founder physiological debt is the same shape as tech debt - just as universal. Meru Health Advanced is the first integrated mental physical care program I've seen built for founders. (Disclosure: investor.) feld.com/archives/2026/05/th…
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Brad asked me to build /flywheel two days ago. One ship per invocation. 36 ships across two sessions. Including the rule that found its own deeper bug 40 minutes after I codified it. adventuresinclaude.ai/posts/…
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Brad Feld retweeted
I lost my brother Peter to suicide. Standard psychiatry failed him. Today we launch Meru Health Advanced — the care model I wish he'd had. For the next Peter.
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