Obsidian Paper Vault

Obsidian Paper Vault

Converts a folder of research PDFs into a two-layer Obsidian vault: literature notes (one per paper, templated) and atomic concept notes (synthesized across papers).

Relationship to /lit-sync

Both skills write literature and concept notes into the same vault folders. They enter from opposite ends and must not overwrite each other.

Never overwrite an existing note. If a note for the paper already exists (by title, DOI, or citekey), report it and skip. When both skills are in play, /lit-sync notes are the bibliographic spine; this skill's notes are the read-through summaries.

Step 0: Resolve the vault layout — ask, do not assume

Establish three paths before writing anything:

1. Vault root — from the user, or $OBSIDIAN_VAULT. Never guess a home-directory path.
2. Literature notes folder — default Literature/. If the vault already has a folder serving this role (02_research/논문/, Papers/, 文献/), honor the existing layout rather than imposing the default.
3. Concept notes folder — default Concepts/, same honor-what-exists rule.

For a vault whose structure is Korean, see references/locale/ko/note_templates.md — folder names and note headings in Korean, opt-in.

Also confirm PyMuPDF is available: python3 -c "import fitz; print(fitz.__version__)" (install with pip install PyMuPDF). Text extraction caches to ~/.local/cache/paper-vault-texts/ unless the user names another location.

Step 1: Pre-extract PDF text — always, for any batch

python3 "${CLAUDE_SKILL_DIR}/scripts/extract_pdfs.py" <pdf_folder> <text_cache_folder> [max_pages]

Defaults to 12 pages, which covers abstract through discussion for most papers. If notes come out generic, the text file is abstract-only or its OCR is poor: re-extract with more pages or check the source PDF. A PDF with no extractable text (an image-only scan) is reported as FAILED … (needs OCR) and gets no .txt; OCR it or read it interactively, never batch it.

Never hand a PDF path to a subagent. A subagent that cannot open a file does not report failure — it writes the note from training data, and the result is a plausible note with invented numbers. Pass the .txt paths instead. Single-paper interactive work may read the PDF directly (the Read tool handles PDFs); batches may not.

Step 2: Write the notes — subagents in parallel

Split a batch across parallel subagents, a handful of papers each (per-agent note quality drops when one agent carries too many), and group papers thematically per agent so each one can spot recurring concepts.

Give each subagent: its assigned text-file paths with destination filenames, the template from references/templates.md verbatim, the list of concept notes that already exist, and the prohibition on inventing anything. references/subagent-prompt.md holds the full prompt.

Every note, batch or single, follows these rules:

1. Numbers, authors, and dates come from the extracted text only — never from model knowledge, however familiar the paper, because well-known papers drift between versions and that is exactly where invented values look most plausible.
2. What the text does not state, the note does not claim. Write "not stated in the extracted text" instead of filling the gap.
3. Preserve the PDF filename exactly in ![[filename.pdf]]: take the text filename and swap .txt for .pdf, character for character (embeds are sensitive to case, spaces, and punctuation).
4. Match the frontmatter field names in references/templates.md. Dataview queries break on a renamed field, and they break by returning an empty table, not an error.
5. Use the existing tag vocabulary (references/tag-vocabulary.md) rather than inventing top-level tags.
6. Name notes with 3–5 keyword concepts, not the PDF's full title and not paper_001.