--- title: "Martin Lepage (@mlepage26) | Hashnode" description: "Martin Lepage (@mlepage26) writes on Hashnode. Read their latest articles and follow their work." url: "https://hashnode.com/@mlepage26" --- @mlepage26 # Martin Lepage @mlepage26 · Montreal, Canada · Joined April 2026 ### [Inside an AI-native Obsidian vault: the architecture of persistent agent memory](https://pharos-ai.hashnode.dev/inside-an-ai-native-obsidian-vault-the-architecture-of-persistent-agent-memory?utm_source=hashnode&utm_medium=feed) Inside an AI-native Obsidian vault: the architecture of persistent agent memory Most AI agent memory systems fall into one of two failure modes. Too flat: A single CLAUDE.md or AGENTS.md that grows into a wall of text. The agent reads all of it on ev... 6 min read · [pharos-ai.hashnode.dev](https://pharos-ai.hashnode.dev/inside-an-ai-native-obsidian-vault-the-architecture-of-persistent-agent-memory?utm_source=hashnode&utm_medium=feed) [May 7](https://hashnode.com/posts/inside-an-ai-native-obsidian-vault-the-architecture-of-persistent-agent-memory/69fcdb7c70e2456113697c6a) ### [The Active Constraints Note: The One File That Stops AI from Violating Your Project Rules](https://pharos-ai.hashnode.dev/the-active-constraints-note-the-one-file-that-stops-ai-from-violating-your-project-rules?utm_source=hashnode&utm_medium=feed) Every project has rules the AI doesn't know about. Not requirements — those are usually in the spec. Not goals — those are in the brief. Rules: the non-obvious constraints that have accumulated through decisions, negotiations, discoveries, and hard l... 7 min read · [pharos-ai.hashnode.dev](https://pharos-ai.hashnode.dev/the-active-constraints-note-the-one-file-that-stops-ai-from-violating-your-project-rules?utm_source=hashnode&utm_medium=feed) [May 7](https://hashnode.com/posts/the-active-constraints-note-the-one-file-that-stops-ai-from-violating-your-project-rules/69fcdb7c70e2456113697c68) ### [The Open Questions Protocol: How to Stop AI from Filling In What It Doesn't Know](https://pharos-ai.hashnode.dev/the-open-questions-protocol-how-to-stop-ai-from-filling-in-what-it-doesnt-know?utm_source=hashnode&utm_medium=feed) There's a failure mode in AI-assisted work that's almost invisible until you know to look for it. Questions that haven't been answered don't stay open in the AI's working model. They get filled in. If you're working on an API design and it's genuinel... 6 min read · [pharos-ai.hashnode.dev](https://pharos-ai.hashnode.dev/the-open-questions-protocol-how-to-stop-ai-from-filling-in-what-it-doesnt-know?utm_source=hashnode&utm_medium=feed) [May 7](https://hashnode.com/posts/the-open-questions-protocol-how-to-stop-ai-from-filling-in-what-it-doesnt-know/69fcdb7b70e2456113697c66) ### [Writing Notes for AI, Not for Humans — The Structural Differences That Matter](https://pharos-ai.hashnode.dev/writing-notes-for-ai-not-for-humans-the-structural-differences-that-matter?utm_source=hashnode&utm_medium=feed) When you write a note for yourself, you're writing for a reader who shares your context. You know what project this belongs to. You know what decisions led here. You know which parts are settled and which are still open. You can afford shorthand, par... 6 min read · [pharos-ai.hashnode.dev](https://pharos-ai.hashnode.dev/writing-notes-for-ai-not-for-humans-the-structural-differences-that-matter?utm_source=hashnode&utm_medium=feed) [May 7](https://hashnode.com/posts/writing-notes-for-ai-not-for-humans-the-structural-differences-that-matter/69fcdb7b70e2456113697c64) ### [How to Write AI Skill Guides That Replace Prompt Engineering](https://pharos-ai.hashnode.dev/how-to-write-ai-skill-guides-that-replace-prompt-engineering?utm_source=hashnode&utm_medium=feed) Prompt engineering has a maintenance problem. You write a careful prompt for a task you do repeatedly — synthesizing research notes, auditing link hygiene, archiving stale material. It works. You save it in a prompts folder. Three months later you ca... 8 min read · [pharos-ai.hashnode.dev](https://pharos-ai.hashnode.dev/how-to-write-ai-skill-guides-that-replace-prompt-engineering?utm_source=hashnode&utm_medium=feed) [May 7](https://hashnode.com/posts/how-to-write-ai-skill-guides-that-replace-prompt-engineering/69fcdb7a1f33cdf689858554)