Jaan Altosaar Turns Six Months of Journals, Sleep and Finance Data into AI-Generated Podcasts with Claude

Jaan Altosaar (known online as thejaan) published a long-form retrospective on his six months of "lifelogging + LLM" practice: feeding hundreds of Obsidian notes — journal entries, to-dos, doctor's notes, financial and sleep data — into Claude to generate a roughly 15-minute personal status podcast each week. He says that while biking and listening to an episode weaving together his journal entries, an AI made him cry for the first time; he then wrote a complete guide so others could try it.

Confirmed

• The podcast content connects journal entries, sleep, and financial data, with each episode around 15 minutes; the author stuck with it for six months and published a full guide including the necessary guardrails.
• Hallucination rate: about 10% of the sentences the model generates are fabricated, such as one claiming his father was recovering from surgery in Estonia.
• Guardrail design: no memory is retained between sessions; no follow-up questions to the model to avoid seeking comfort from it; a brand-new session is started every 5-10 weeks.
• Context engineering trick: instead of stuffing all notes into the model, he feeds it only "what changed" (like a track-changes diff), using Obsidian's built-in version snapshots to obtain note differences, yielding higher-quality output.

Why it matters

This is a rare long-term personal LLM practice record with a quantified hallucination rate and explicit safeguards: it showcases the emotional impact of a model weaving together personal data, while honestly flagging the 10% fabrication rate and dependency risks — offering readers looking to build life-review apps a reusable methodology (data sources, diff-based feeding strategy, guardrails) rather than a mere experience share.

2026-09-24 ~ 2026-09-24 · 5 related posts

• [source] Lifelogging with LLMs: weekly Claude podcasts from journals, sleep and finance data — thejaan · 2026-09-24
• [source] Claude-Generated 15-Min Podcast Linking Journals, Sleep and Finances Made Him Tear Up — thejaan · 2026-09-24
• Context engineering trick: feed LLMs only what changed, via Obsidian edit snapshots — thejaan · 2026-09-24
• [source] ~10% hallucinated sentences: guardrails for lifelogging with LLMs — thejaan · 2026-09-24
• Six months of Claude-generated personal podcasts linking journals, sleep and finances — mrdrozdov · 2026-09-24