Second-Brain.Vault

A modular PKM system using Claude Opus 5.5 to automate note sorting and synthesis.

Description

An agentic personal knowledge management system built within Obsidian that leverages Claude Opus 5.5 and Claude Code. It automates the 'Second Brain' workflow by using AI to process an inbox of markdown files, identify connections between notes, and generate weekly reviews or content drafts based on a custom operating manual (CLAUDE.md).

Descriptions, tags, and model credits may be AI-generated or inferred from public sources and can be incomplete or wrong. Learn more.

Details

Why this is interesting: A sophisticated example of personal knowledge automation using agentic reasoning to manage complex file operations and…
Built with: Opus 5.5 Redwood AI Sonnet 5.5
Tags: #pkm #obsidian #agent #automation

Discovered: X
First posted: X · Oct 7, 2026
Listed: Added 2h ago
Build: Strong
Models: Strong

Prompts

Prompt 1

keep_alive = second_brain(model="opus-5.5", fixes={
"lost": Fix(habit="capture in 2 seconds", where="inbox/", how="text, voice or photo", rule="capture now, sort later", by="you"),
"buried": Fix(habit="daily sort", by="opus"),
"alone": Fix(habit="link to a hub", by="opus"),
"silent": Fix(habit="ask with sources", by="you"),
"unused": Fix(habit="weekly draft", by="both"),
})

Source

Prompt 2

recall = ask(model="opus-5.5", vault="~/notes", steps={
  "ask": Step(by="you", style="plain words", example="what did I decide in March?", avoid="single keywords", out="a real question"),
  "search": Step(scope="every note", out="matches"),
  "read": Step(limit=3, out="full notes"),
  "cite": Step(format="[[note]]", out="links"),
  "answer": Step(else_="not in my notes", out="answer"),
})

Source

Prompt 3

Process every file in 00_inbox. Follow CLAUDE.md for all rules.

For each inbox file:
1. Read it fully.
2. Split it into separate notes if it contains more than one idea.
3. For each idea, write a clean note:
   a. Bold one line summary at the top
   b. Tags on line two
   c. My original words, cleaned of typos and structured, not rewritten
   d. Any source link kept at the bottom
4. Choose the right folder (projects, areas, resources). Use subfolders by topic if one already exists.
5. Search the vault for 3 to 5 related notes and add them under a "Links" heading as [[wikilinks]].
6. Add a backlink to this new note at the bottom of each related note.
7. Move the original inbox file to 40_archive/inbox_processed.

When finished, give me a table:
| Original capture | New notes created | Folder | Links added |

Then list anything tagged #unsure so I can decide.

Source

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