Sources
The research pack, export chapter digests, corroboration surveys, and annotated shelves.
- Anthropic Engineering Blog Shelf (best-practices, developing): This shelf catalogs the Anthropic engineering posts this brain cites, dated and annotated; the canonical agent-building sequence runs from Building Effective Agents (2024-12-19) through Scaling Man…
- Export Chapter Artifacts API and Citations (claude-ai-harness, developing): Lines 3407-3826 of the export let artifacts call the Anthropic API with harness-handled auth pinned to a Sonnet 4 snapshot, define cite-tag mechanics, inventory ten skills, and reveal a wildcard ne…
- Export Chapter Computer Use and Search (claude-ai-harness, developing): Lines 1027-1692 of the export mandate SKILL.md-first computer use, a three-directory file scheme, 20-line artifact thresholds, a visual-output routing checklist, effort-scaled search, and copyright…
- Export Chapter Memory and Preferences (memory-and-context, developing): Lines 193-1025 of the export specify the consumer memory system, artifact persistent storage, MCP app suggestion etiquette, past-chats retrieval, userPreferences gating, memory safety reminders, an…
- Export Chapter Product and Behavior (claude-ai-harness, developing): Lines 1-191 of the claude.ai system prompt export define the 190000-token runtime budget, the Fable 5 and Mythos 5 product story, refusal and wellbeing policy, tone rules, six runtime reminder type…
- Export Chapter Tool Schemas (tools-and-skills, developing): Lines 1693-3405 of the export define 24 inline tools in JSONSchema, from computer use through consumer widgets to MCP plumbing, then re-anchor Claude’s identity as Anthropic’s consumer chat surface…
- Fable Mythos 5 System Card (model-and-family, mature): The Claude Fable 5 and Claude Mythos 5 system card is the primary public evidence source for the shared-weight model’s capabilities, safety evaluations, threshold judgments, and deployment split.
- Public System Prompt Copies (claude-ai-harness, developing): Every known public copy of the Fable 5 system prompt, official and community, corroborates this vault’s 3,826-line capture of 2026-07-07, and nothing found online contradicts it (web survey, 2026-0…
- research-pack-2026-07-07 (best-practices, mature): Every entry below was fetched and verified on the retrieved date; claims derived from them were adversarially checked (see (path) Grouped by source type. Refresh: official 30 days, practitioner 90 …