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Overview
About Tian Pan — building the trust layer for AI agents. Staff Engineer at Airbnb. Founder of Beancount.io.
News
The User You Can't Delete: Right to Be Forgotten in AI Systems
A right-to-erasure request exposes an uncomfortable truth about AI systems: user data is smeared across model weights, vector indexes, and caches with no single row to delete. How to design for forgettability.
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The Tool Belt That Grew a Long Tail Nobody Uses
Every tool you add to an agent dilutes its ability to pick the right one. The dozen tools nobody calls are quietly degrading selection on the three that matter - here is how to keep a tool catalog honest.
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The Token-Per-Minute Ceiling You Never Load-Tested
Provider rate limits are a per-minute token budget you don't control - and a launch is a terrible time to find the ceiling. How to forecast, load-test, and buy headroom before the 429s hit.
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The Semantic Diff: Reviewing a Prompt Change When the Line Diff Tells You Nothing
A three-word prompt edit can triple your hallucination rate while the line diff looks harmless. Why prompt changes need a semantic diff - comparing behavior, not text - and how to gate PRs on it.
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The p99 Is a Product Decision, Not an Infra One
Your tail-latency target isn't something the infra team optimizes down to a number - the number itself is a product choice. How UX affordances and latency budgets trade against each other, and why the p99 belongs in the design review.
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