gaps - SKILL.md Agent Skill

name: gaps allowed-tools: Read, Glob, Grep, Bash description: > Use when the user asks to find content gaps in their Obsidian vault, missing pages, topics that should have a dedicated note, or mentions "/obsidian-wiki:gaps". Trigger on "what's missing from my wiki", "find topics I should write up", "any gaps in my notes", or "entities I keep mentioning but don't have a page for".

Vault path: <vault> refers to the path returned by $CLAUDE_PLUGIN_ROOT/scripts/resolve-vault.sh. Run it first to resolve the vault location.

Vault Gaps

Find topics or entities mentioned across multiple pages in <vault> that don't have a dedicated page of their own. These are the wiki's content gaps — candidates for new pages to write.

This is report-only. The skill never creates new pages on its own; it only surfaces candidates and lets the user decide which to write up (using ingest once they have a source).

Step 1 — Build the entity universe

Scan the six category directories for capitalized names that look like entities. The heuristic:

Multi-word Title Case runs in prose: "Tor Bootstrap", "Caddy ACME", "GrapheneOS Sandbox".
Quoted commands and tool names: mkp224o, obfs4, passwall2.
[[wikilinks]] whose target file does not exist (these are explicit gaps).

Collect each unique entity and the set of pages where it appears.

Exclude:

Common English title-cased words ("The", "This", "When", section headers).
Page filenames themselves (a page is not a gap for its own topic).
Anything inside a code fence — code is reference material, not topic mentions.

Step 2 — Count and rank

For each entity, count how many distinct pages mention it. Rank by mention count, descending.

The signal you want: an entity mentioned by ≥3 different pages but lacking its own dedicated page is almost certainly a gap. An entity mentioned in 1 page is probably just a passing reference.

Step 3 — Filter out entities that already have pages

For each candidate entity, check whether a page already exists for it:

A file in any category directory whose basename matches (case-insensitive).
A page whose aliases: frontmatter includes the entity name.
A page whose title: frontmatter is the entity name.

Remove all matches. The remaining set is the gap candidate list.

Step 4 — Categorize the gaps

For each gap candidate, suggest where the new page would live (Architecture / Gotchas / Patterns / Platforms / Projects / Technologies). Use the rules in CLAUDE.md — when in doubt, look at where the entity is currently mentioned and infer the category from the surrounding pages.

Step 5 — Report

# Vault gaps — <YYYY-MM-DD>

## High-confidence gaps (mentioned by ≥3 pages, no dedicated page)
1. **Caddy ACME** — likely category: `Technologies/`
   - Mentioned in: `Gotchas/Caddy Let's Encrypt Rate Limits.md`, `Architecture/...`, `Patterns/...`
   - Suggested file: `Technologies/Caddy ACME.md`
2. **GrapheneOS Sandbox** — likely category: `Platforms/`
   - Mentioned in: ...

## Broken wikilinks (already-explicit gaps)
- `[[Hardened Kernel]]` referenced from `Gotchas/...` — no page exists
- ...

## Lower-confidence (mentioned by 2 pages)
- ...

Sort by mention count, highest first. Cap each section at 15 entries to keep the report scannable.

Step 6 — Log

Append a single one-line entry to log.md:

## [YYYY-MM-DD] gaps | <H high-confidence, B broken-link, L low-confidence>

(Type gaps is acceptable as an extension to the standard ingest|query|lint|schema set. The schema's log section should permit it; if CLAUDE.md doesn't yet, mention this to the user as a candidate schema update.)

The report itself is printed to chat, not written into the vault.

What never to do

Auto-create pages. This skill only surfaces gaps. Use ingest to actually write a page once a source exists.
Suggest gaps that are name-drops. A capitalized word in one paragraph of one page is not a gap.
Trust the heuristic blindly. The user's judgment is the real filter.

Common pitfalls

Reporting too many gaps. Cap each section. Quality over quantity.
Missing aliases — an entity might be covered by a page with a different filename but the alias matches. Always check aliases: frontmatter.
Confusing "no page yet" with "no raw/ source yet". This skill doesn't know whether the user has source material — it just reports the gap.