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This is the Fable 5 Brain: a source-cited Obsidian knowledge brain about the Claude Fable 5 model, the harnesses it runs in (claude.ai and Claude Code), and current operating best practices.

Read order

1. overview for the big picture.
2. CONVENTIONS for the contract every note follows.
3. index for the master catalog.
4. The domain hub _index.md in each folder, then the atomic note.

Ground rules

• Read before write. Cite dated sources. No em dashes.
• Every claim carries a confidence tag per the confidence tags reference; folklore is never asserted.
• the immutable source layer is immutable; quotes from the export are verbatim, at most 15 words, with line refs.
• Anything past its refresh_due in the source ledger is stale until re-verified.

The eight domains

model-and-family, claude-ai-harness, claude-code-harness, tools-and-skills, memory-and-context, communication-rules, safety-and-permissions, best-practices. Each note carries one domain and one fable5/* tag; the graph colors by those tags per Tag Taxonomy.

Operating the brain

• Ask questions through the fable-secretary agent; it reads AGENTS.md, then this vault, and cites both the note and the official URL.
• New system prompt exports go to the immutable source store with a dated name, then scripts/import_system_prompt_export.py parses and diffs them.
• Gates before any commit: python3 scripts/lint_vault.py and python3 scripts/audit_brain.py --json.