Field Notes — Paitho https://paitho.ai/field-notes The practitioner blog for Paitho. Operators writing for operators. Specific. Honest. A little dry. en-us Mon, 27 Apr 2026 08:13:01 +0000 Forking a Prompt: A Walkthrough of v0.9 → v1.0 of extract_signals() https://paitho.ai/field-notes/forking-a-prompt Every LLM call in Paitho is versioned. You can read the prompt. You can fork it. What you cannot do is accidentally not know what the model is doing —… Tue, 14 Apr 2026 14:00:00 +0000 https://paitho.ai/field-notes/forking-a-prompt noreply@paitho.ai (Alex Kim) Prompt versioning The Sandbox Tour: What 7 Founders Did in Their First 30 Minutes https://paitho.ai/field-notes/sandbox-tour The Sandbox is free. No card required. It runs against a seeded dataset — real company structures, anonymized — so you see the pipeline work without… Tue, 07 Apr 2026 14:00:00 +0000 https://paitho.ai/field-notes/sandbox-tour noreply@paitho.ai (Rosa Marin) Sandbox & UX Why We Human-Gate Contact Enrichment (and Won't Stop) https://paitho.ai/field-notes/why-we-human-gate-enrichment Stage 07 in the Paitho pipeline is labeled HUMAN. Not AI, not hybrid. Human. Tue, 31 Mar 2026 14:00:00 +0000 https://paitho.ai/field-notes/why-we-human-gate-enrichment noreply@paitho.ai (Jane Doe) Pipeline internals Burner Domains, Blacklists, and the Cost of 'More Volume' https://paitho.ai/field-notes/burner-domains-blacklists The standard agency playbook for cold outreach goes like this: buy 30 domains, warm them up, run 200 sends per day per domain, rotate when deliverability… Tue, 24 Mar 2026 14:00:00 +0000 https://paitho.ai/field-notes/burner-domains-blacklists noreply@paitho.ai (Rosa Marin) Deliverability Building the Clinical Ops Vertical Pack: 11 Weeks, 3 Advisors, 47 Signals https://paitho.ai/field-notes/clinical-ops-vertical-pack The Clinical Ops pack took longer than any other vertical we have built. It started as a simple taxonomy project and became a lesson in why Principle 5 —… Tue, 17 Mar 2026 14:00:00 +0000 https://paitho.ai/field-notes/clinical-ops-vertical-pack noreply@paitho.ai (Sam Park) Vertical packs BYOK Economics: What 1,000 Leads Actually Cost Across 6 Model Providers https://paitho.ai/field-notes/byok-economics Bring Your Own Key. Easy to say. The real question is: what does it actually cost to run 1,000 leads through the full 11-stage pipeline, and how much does… Tue, 10 Mar 2026 14:00:00 +0000 https://paitho.ai/field-notes/byok-economics noreply@paitho.ai (Alex Kim) Pricing & cost The 10-K Is a Pain-Signal Goldmine. Here's the Read Order. https://paitho.ai/field-notes/10k-pain-signal-goldmine Most outbound skips public company filings entirely. The 10-K is 80 pages. The email has to go out today. So reps pull a LinkedIn summary and write a guess. Tue, 03 Mar 2026 14:00:00 +0000 https://paitho.ai/field-notes/10k-pain-signal-goldmine noreply@paitho.ai (Jane Doe) Pipeline internals Why We Rejected 4,200 Drafts Last Quarter https://paitho.ai/field-notes/why-we-rejected-4200-drafts Last quarter, Paitho's pipeline generated a beta cohort of email drafts on the order of ~14K-15K across all active operators. Operators expect to reject… Tue, 24 Feb 2026 14:00:00 +0000 https://paitho.ai/field-notes/why-we-rejected-4200-drafts noreply@paitho.ai (Rosa Marin) Pipeline internals Reply Rates by Angle: 14 Months of Versioned Prompt Data https://paitho.ai/field-notes/reply-rates-by-angle Every prompt we ship has a version number. Every send links back to a versioned prompt. Every reply — or non-reply — closes the loop. Fourteen months of that… Tue, 17 Feb 2026 14:00:00 +0000 https://paitho.ai/field-notes/reply-rates-by-angle noreply@paitho.ai (Alex Kim) Reply data The Anatomy of a Pain Signal: Reverse-Engineering 28 of Them https://paitho.ai/field-notes/anatomy-of-a-pain-signal Pain is not a feeling. In outbound, pain is a dated, observable fact about a company that you can cite in six sentences and make a VP wince. Tue, 10 Feb 2026 14:00:00 +0000 https://paitho.ai/field-notes/anatomy-of-a-pain-signal noreply@paitho.ai (Rosa Marin) Pipeline internals