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undefined-ui / second-brain-lint

Audit a second-brain vault for structural problems and repair them: broken wikilinks, orphan pages, empty stubs, frontmatter that violates the schema, near-duplicate pages, and stale index entries. Use this skill whenever the user asks to lint, clean, audit or check the health of their vault, says pages feel messy or links are broken, after a large bulk import, or when a scheduled maintenance run fires. Do NOT use for ingesting new sources, for answering questions from the vault, or for rewriting page content that is structurally fine but reads badly.

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SKILL.md
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Lint the vault

Structural rot is silent. Nothing errors, nothing crashes, the vault just
slowly stops answering questions well because a third of its pages are
unreachable. Linting is the only thing that catches it before the owner does.

Core rule

Report before repairing. Fix the mechanical problems automatically, but never
delete or merge a page without listing it first and getting a yes, because the
owner may have written it by hand.

Workflow

  1. Inventory. Count pages by type. Build the link graph by parsing every
    [[wikilink]].

  2. Broken links. Links pointing at pages that do not exist. Distinguish
    two cases: a typo or rename, which you fix, and a genuine gap, which goes
    into index.md under Gaps.

  3. Orphans. Pages with no inbound links. For each, either find where it
    should be linked from and add the link, or flag it as a candidate for
    deletion.

  4. Stubs. Pages under roughly 40 words with no links. Usually a failed
    ingest. Flag for re-ingest from the original source in raw/.

  5. Schema. Missing or malformed frontmatter, wrong type, missing dates,
    tags outside the existing vocabulary.

  6. Near-duplicates. Pages with very similar titles or aliases. Propose
    merges; do not perform them unsolicited.

  7. Index drift. Pages missing from index.md, index entries pointing
    nowhere.

  8. Repair, then append the run to log.md.

Output format

Vault: <n> pages (<n> sources, <n> concepts, <n> entities, <n> synthesis)
Link graph: <n> links, average <n> per page, <n> orphans

Fixed automatically:
- <list>

Needs a decision:
- <list, each with the recommended action>

Health: orphan rate <n>%, broken link rate <n>%, stub rate <n>%

Calibration

An aggressive linter that merges pages on its own judgement destroys work. A
timid one that only reports produces a list nobody acts on. The split above is
the useful line: mechanical fixes happen, semantic decisions get proposed.

Do not run a full lint after every ingest. Weekly, or after an import of more
than about twenty sources.