second-brain-mapping

name	second-brain-mapping
description	Use when the user wants to map or remap their second brain, refresh the vault's queryable metadata index, extract structured frontmatter from typed notes (books, meetings, people, journals, goals), fill wikilink gaps, or surface cross-type insights and patterns no single file shows. Triggers: /second-brain-mapping, "map my second brain", "make my vault queryable", "refresh vault metadata", stale or sparse Dataview fields. Not for single-file reads or querying an existing graph (use graphify).
trigger	/second-brain-mapping
argument-hint	[--metadata-only | --insights-only | --dry-run | --sample [N] | --force | --type <name>]

/second-brain-mapping

{SKILL_DIR} = this skill's own folder (locally: the directory this SKILL.md lives in; a served brain substitutes the real absolute path before you read this). Shared starter files live at the repo root two levels up: {SKILL_DIR}/../... If a path does not resolve, name the missing file and stop — never guess another location.

Your vault is a database. This skill makes it queryable.

What it does

Phase	Tool	LLM cost	Always runs?
1	vault-metadata-extract.py (dispatcher → type-specific extractors)	0 tokens	Yes
2	/graphify (optional)	~100k–1M tokens	No — asks first
3	Wikilink gaps + interactive apply	~5k tokens	If graph exists
4	vault-insight-engine.py — cross-type surprise finder	0 tokens	Yes

Phases 1 and 4 are free. Phase 2 is expensive and opt-in. Phase 3 needs interactive approval so it skips gracefully in non-TTY contexts.

Setup

Run once after cloning ai-brain-starter:

/setup-vault-types

Interactive wizard asks which doc types you have (journal, book, article, meeting, person, project, podcast, client, etc.) and installs the matching extractors. You can add custom types later by editing scripts/extractors/schemas.yaml or running /setup-vault-types --add <name>.

Usage

/second-brain-mapping                 # full pipeline
/second-brain-mapping --metadata-only # skip graphify + wikilinks, keep insights
/second-brain-mapping --insights-only # only run Phase 4 on existing metadata
/second-brain-mapping --type book     # only process files with `type: book`
/second-brain-mapping --dry-run       # preview without writes
/second-brain-mapping --sample        # preview 1 file per configured type (cold-start safe)
/second-brain-mapping --sample 3      # preview 3 files per configured type

First-time cold-start? Run --sample first. It processes one file per registered type, shows you the actual extracted fields, and exits without writing anything. If the output looks right, re-run without --sample for the full pipeline.

Why this matters

Most PKM tools stop at search. This turns your vault into a queryable database:

• "Every book I rated 4+ that mentions compound interest"
• "Every high-priority contact not touched in 60+ days"
• "Every concept that appears in my books AND journals AND writing drafts"
• "People whose name co-occurs with low-floor journal entries 60%+ of the time"

Dataview handles the queries. This skill handles the structured fields that make Dataview precise.

Steps

Follow in order. Do not skip.

Step 1 — Context + per-phase recency check

Run date for timestamp. Parse any argument flags.

Precheck: was /setup-vault-types run? Before anything else, confirm the vault has at least one document-type extractor configured. Without this, Phase 1 runs silently on every file and reports "no extractor registered" for the user's entire vault — a classic cold-start bounce.

EXTRACTOR_DIR="$(pwd)/scripts/extractors"
EXTRACTOR_COUNT=0
if [[ -d "$EXTRACTOR_DIR" ]]; then
  EXTRACTOR_COUNT=$(find "$EXTRACTOR_DIR" -maxdepth 1 -name '*.py' -not -name '_*' 2>/dev/null | wc -l | tr -d ' ')
fi
if [[ "$EXTRACTOR_COUNT" -eq 0 ]]; then
  echo "No document-type extractors are configured yet."
  echo "Run /setup-vault-types first — that wizard asks which kinds of notes"
  echo "you take (journal, book, meeting, person, etc.) and installs the matching"
  echo "extractors. Then re-run /second-brain-mapping."
  exit 4
fi

If this check fails, stop. Do not proceed to any phase. Tell the user to run /setup-vault-types and offer to invoke it for them.

Read the state file to see what was done and when:

STATE_FILE="$(vault-root)/⚙️ Meta/.second-brain-mapping-state.json"
[[ -f "$STATE_FILE" ]] && cat "$STATE_FILE" || echo '{}'

State file format (JSON):

{
  "phase_1_metadata":  "2026-04-21T10:02:00-05:00",
  "phase_2_graphify":  "2026-04-21T09:04:26-05:00",
  "phase_3_wikilinks": null,
  "phase_4_insights":  "2026-04-21T10:02:00-05:00"
}

null means never completed OR killed mid-run. A timestamp means last successful completion.

A stamp is NOT proof the artifact still exists. graphify-out/ is gitignored (a large, regenerable derived artifact should not bloat the repo). Untracked means it can vanish to ANY filesystem operation — a folder move, git clean, a disk cleanup — with zero trace, while this state file still says phase_2_graphify: <date>. The stamp then lies. Before honoring the graph-dependent stamps, PROBE THE FILE:

python3 "$(vault-root)/scripts/graph-liveness-check.py" --heal

• Exit 0 → graph present (or never built) — proceed normally.
• Exit 3 (LOST) → the graph is GONE despite a stamp. --heal has already nulled phase_2_graphify + phase_3_wikilinks so the decision rule below rebuilds them. Tell the user loudly: the graph was lost, the source is intact, rebuilding. NEVER skip Phase 2/3 on a stamp the liveness check just invalidated.
• Exit 4 (STALE) → graph older than the freshness window; recommend a refresh.

Bug class STAMP-GREEN-WHILE-ARTIFACT-GONE. The recency check probes the leaf (the file), never the proxy (the timestamp).

Decision rule:

• If --force flag: run everything regardless.
• Else for each phase: if stamp < 4 hours old AND not null → skip (report "Phase X: skipped, ran Y ago"). If stamp is null OR > 4 hours old → run it. Phase 2 (graphify) always confirms before running regardless of stamp.
• Phase 2/3 stamps are only honored if the liveness check above reported the graph present. A LOST graph forces a rebuild regardless of stamp age — the artifact, not the timestamp, is the source of truth.
• Report the plan BEFORE running: "Will run: Phase 3 (null), Phase 4 (>4h). Skipping: Phase 1 (1h ago). OK? y/N"

After each phase succeeds, update its stamp with the current ISO-8601 timestamp. If a phase is killed or errors, leave the stamp untouched so next run sees it as incomplete.

Helper to write stamp (use after each phase):

python3 -c "
import json, pathlib, datetime
p = pathlib.Path('$STATE_FILE')
d = json.loads(p.read_text()) if p.exists() else {}
d['$PHASE_KEY'] = datetime.datetime.now().astimezone().isoformat(timespec='seconds')
p.write_text(json.dumps(d, indent=2))
"

Step 2 — Phase 1: vault-metadata-extract

If Step 1 decided to skip, skip. Else:

python3 "$(vault-root)/scripts/vault-metadata-extract.py" $FLAGS

On success, stamp phase_1_metadata. Report: X files written, Y already tagged, types with no registered extractor.

Step 3 — Phase 2: graphify (confirm first)

Always ask, even if stamp is fresh. Graphify has its own internal staging and token cost varies wildly.

Before asking, compute a vault-specific cost estimate. A generic "~100k-1M tokens" warning is useless to a first-time user. Show them numbers tied to their actual corpus:

python3 <<'PY'
import os, glob, pathlib, sys

vault = os.getcwd()
SKIP = {"⚙️ Meta", "Archive", ".git", ".obsidian", "graphify-out", "node_modules"}
total_files = 0
total_words = 0
for fp in glob.glob(os.path.join(vault, "**", "*.md"), recursive=True):
    parts = set(fp.split(os.sep))
    if parts & SKIP:
        continue
    total_files += 1
    try:
        with open(fp, "r", encoding="utf-8", errors="ignore") as f:
            total_words += len(f.read().split())
    except Exception:
        pass

# Rough estimate: 1 word ≈ 1.3 tokens input; graphify wrappers reduce ~85% for a full run
# Output is typically 10-15% of input for extraction.
input_tok = int(total_words * 1.3 * 0.15)   # after dedupe + cache + preextract
output_tok = int(input_tok * 0.12)

# The TOKEN estimate is real. The DOLLAR cost depends on how graphify is routed.
# Default in an ai-brain-starter install: semantic extraction runs via SUBAGENTS on
# your Claude subscription (Max/Pro), and ~80% of edges come from zero-LLM
# deterministic passes (AST + typed-edge frontmatter/wikilink extraction). So the
# marginal DOLLAR cost is ~$0. The figure below is the paid-API-EQUIVALENT — only
# meaningful for users who run graphify on metered API billing, NOT a subscription.
api_cost = (input_tok / 1_000_000) * 3 + (output_tok / 1_000_000) * 15  # Sonnet public $/M
warm_cost = api_cost * 0.10  # incremental run, cache warm

existing = pathlib.Path("graphify-out/graph.json").exists()
mode = "incremental (cache warm)" if existing else "cold start (no cache yet)"
est_api = warm_cost if existing else api_cost

print(f"Corpus:   {total_files:,} files · ~{total_words:,} words")
print(f"Mode:     {mode}")
print(f"Tokens:   ~{input_tok:,} input · ~{output_tok:,} output (estimate)")
print(f"Dollars:  ~$0 on a Max/Pro subscription (subagent-routed — the default here)")
print(f"          Paid-API-equivalent (metered billing only): ~${est_api:.2f}")
PY

stat -f "%Sm" "$(pwd)/graphify-out/graph.json" 2>/dev/null || echo "Last graph: none yet"

Then ask: "Run graphify on this corpus? y/N"

If yes, invoke /graphify --update. Read the graphify skill's own SKILL.md first ({SKILL_DIR}/../graphify/SKILL.md — sibling skill folder, resolves in both local and served installs). On success, stamp phase_2_graphify.

Cost framing (do not misquote): the token estimate is real, but on a Claude Max/Pro subscription graphify's semantic extraction runs through subagents (no per-token dollar charge) and ~80% of edges come from zero-LLM deterministic passes — so the marginal dollar cost is effectively $0. Only quote dollars if the user is on metered API billing. Never let a paid-API figure talk a subscription user out of a rebuild — that inverts the whole point of maximum context.

Step 4 — Phase 3: wikilinks

If Step 1 decided to skip, skip. Else:

python3 "$(vault-root)/scripts/graphify_wikilink_gaps.py"
if [[ -t 0 ]]; then
  python3 "$(vault-root)/scripts/graphify_apply_wikilinks.py"
else
  echo "Non-interactive: wikilink apply skipped. Run manually to review."
fi

On success (both commands exit 0), stamp phase_3_wikilinks. If killed mid-run or errors, DO NOT stamp — next invocation will see it as null and re-run.

Step 5 — Phase 4: insights

If Step 1 decided to skip, skip. Else:

python3 "$(vault-root)/scripts/vault-insight-engine.py" --top 5

On success, stamp phase_4_insights. Read the top 5 findings aloud. Don't summarize — paste the report section verbatim so the user sees the raw signal.

Scoping to a recent batch. When Phase 2 only processed a subset of files (e.g. a /graphify --update of 200 new files), the same vault-wide patterns dominate every run. To surface insights specific to the batch instead, pass --scope-files:

python3 "$(vault-root)/scripts/vault-insight-engine.py" \
  --scope-files "$(vault-root)/path/to/file-list.txt" \
  --scope-label "batch-YYYY-MM-DD" \
  --top 5

File list = one path per line (relative to vault-root or absolute). Findings restrict to those files; baselines still derive from the full vault so "surprise" is measured against your whole history. Without the flag, behavior is unchanged.

Step 6 — Summary + cross-type query suggestions

Print a compact summary. Then suggest 2-3 concrete Dataview queries the user could now run based on what got extracted. Examples:

You now have 47 books and 264 people. Try these queries on any note:

  // Books you loved that mention a concept:
  TABLE book_author, book_rating_1_5
  FROM "Notes/Books"
  WHERE book_rating_1_5 >= 4
    AND contains(book_themes, "<concept>")

  // High-priority contacts going cold:
  TABLE person_last_journal_iso, person_next_step
  FROM "CRM"
  WHERE person_priority = "high"
    AND person_last_journal_iso < dateformat(date(today) - dur(60 days), "yyyy-MM-dd")

Non-negotiables

• Zero LLM in extraction. Every field is regex/enum/count/verbatim section. No paraphrase. No summarization.
• Always confirm Phase 2. Graphify is expensive.
• TTY guard Phase 3. Non-interactive shells skip apply_wikilinks with a message, never abort mid-file.
• Report honestly. If Phase 4 found nothing notable, say so.

Architecture

scripts/
  vault-metadata-extract.py       # entry point
  vault-insight-engine.py         # cross-type surprise finder
  vault-classify-untyped.py       # MiniMax-powered type suggester
  second-brain-mapping.sh         # orchestrator (all four phases)
  extractors/
    _base.py                      # shared helpers
    _dispatcher.py                # type → extractor routing
    schemas.yaml                  # declares fields per type
    journal.py  book.py  person.py  concept.py  article.py
    business.py meeting.py ai_chat.py writing_draft.py
    strategy.py negotiation_prep.py company.py
    daily_log.py talk.py travel.py goal.py
    playbook.py asset.py reference.py
    # Add your own: extractors/<type>.py + entry in schemas.yaml

Each extractor module exports AUTO_FIELDS and extract(filepath, body, fm, context) -> ExtractionResult. The dispatcher auto-discovers any file in extractors/ that has an extract function.

Adding your own type

1. Edit extractors/schemas.yaml to declare your fields
2. Copy an existing extractor (e.g., book.py) as template
3. Rename, update logic, save as extractors/<your_type>.py
4. Add type: <your_type> to any doc that qualifies
5. Run /second-brain-mapping --type <your_type> to verify

The framework doesn't care what types exist. It cares that each type declares its fields and ships an extractor.