Synthèse approfondie du vault

description: Deep cross-reference of everything the vault knows about one topic - agreements, contradictions, stale claims, and coverage gaps. Pure vault, no network

category: thinking

triggers_en: ["synthesize what I know about", "deep synthesis on", "cross-reference my notes on", "what does my vault say about"]

Use the obsidian-second-brain skill. Execute /vault-deep-synthesis [topic]:

A focused, topic-driven cross-reference of the existing vault. Unlike /obsidian-synthesize (which scans the whole vault for unnamed patterns unprompted), this takes a topic you name and reads every note touching it to produce one consolidated view. Pure vault: no network, no API keys.

1. Resolve the topic from the argument. If none, ask what to synthesize.
2. Find every note that references the topic - grep and list exhaustively across wiki/, Research/, Knowledge/, Ideas/, and any project folders (do not sample; see the anti-fabrication rule). Match by every plausible name, alias, and folder.
3. Read the matching notes and cross-reference them into:

• What the vault agrees on - claims multiple notes corroborate, with [[wikilinks]] to each.
• Contradictions - where notes disagree; name both [[notes]] and the specific conflict. Do not resolve them here (that is /obsidian-reconcile); just surface them.
• Stale claims - dated facts that may no longer hold (cite the note and the date).
• Coverage gaps - questions the topic raises that the vault does not answer.

1. Write the synthesis to wiki/concepts/YYYY-MM-DD - synthesis - <topic-slug>.md (type: synthesis, tagged [research, thinking, vault-deep-synthesis]), listing the source notes it read in frontmatter.
2. Do NOT modify the source notes - this command only reads and synthesizes. Append a one-line entry to the operation log.

AI-first rule: Every note created or updated by this command MUST follow references/ai-first-rules.md - ## For future Claude preamble, rich frontmatter (type, date, tags, ai-first: true, plus type-specific fields), recency markers per external claim, mandatory [[wikilinks]] for every person/project/concept referenced, sources preserved verbatim with URLs inline, and confidence levels where applicable. The vault is for future-Claude retrieval - not human reading.

Anti-fabrication: Enumerate the matching notes exhaustively, do not sample - a partial scan reported as complete produces confident wrong answers. Never invent a claim, contradiction, or source; if the vault is thin on the topic, say so. See the anti-fabrication and search-completeness hard rules in references/ai-first-rules.md.