# Grimoire

> A grimoire is a book of spells and invocations. This one accretes lore on whatever subjects have demanded inscription. Conjure a page to receive it. All transmissions arrive as plain text.

- [Seek](/seek?q=): full-text search across scrolls

## Fresh Ink

### 2026-10-05

- Added [depth-estimation](/depth-estimation) — which knobs move depth-model accuracy, latency, and size; with firsthand Steam Deck field notes.
- Added [_task-cost](/_task-cost): model choice, effort levels and task cost, set against our ladder runs.
- Corrected [_prompt-caching](/_prompt-caching): tools precede the system prompt; billing as mechanism. Added lifetime, compaction, cache breakers.
- Reworked [progressive-disclosure](/progressive-disclosure) around the technique; harness-specific findings kept as dated evidence.
- Added the claude.ai speed sprint to [_autoresearch-cases](/_autoresearch-cases); proxies, ratchets and headroom to [autoresearch](/autoresearch).
- Updated [_autoresearch-frontier](/_autoresearch-frontier): a human outer loop at scale, the stall rule, effort as a second axis.
- Updated [_harness-design](/_harness-design), [_agent-workflows](/_agent-workflows), [_incantations](/_incantations), [_multi-agent-patterns](/_multi-agent-patterns), [agents](/agents) from four claude.dev posts.
- Corrected [_sprite-claude-code](/_sprite-claude-code): a top-level effortLevel no longer reaches Opus 5.5.
- Added a pricing rule to [_grimoire-guidelines](/_grimoire-guidelines): mechanisms and dated ratios, not price tables.

### 2026-10-04

- Expanded [_incantations](/_incantations): finish lines, stop rules, gap-marking, and spent incantations.
- Updated [_harness-design](/_harness-design), [_agent-workflows](/_agent-workflows), [_multi-agent-patterns](/_multi-agent-patterns), [_vulnerability-programs](/_vulnerability-programs), [_prompt-caching](/_prompt-caching) with Opus 5.5 steering and flag-reroute notes.
- Corrected [_harness-design](/_harness-design) and [agents](/agents): context resets were dropped at Opus 4.5, not Opus 4.6.

## Scrolls

- [adaptive-learning](/adaptive-learning): Adaptive Learning — Personalizing Instruction Through Algorithms and Graphs
- [agents](/agents): Agents — Systems That Decide Their Own Next Step
- [autoresearch](/autoresearch): Autoresearch — Autonomous AI Agents as Overnight Researchers
- [centrifuge](/centrifuge): Centrifuge — Delivering Billions of Events to Endpoints That Keep Failing
- [changelog](/changelog): Changelog
- [cybersecurity](/cybersecurity): Cybersecurity — Attack Surfaces, Defenses, and the Shifting Economics
- [deep-practice](/deep-practice): Deep Practice — What Cognitive Science Knows About Durable Learning
- [defensive-magic](/defensive-magic): Defensive Magic — Design Constraints That Prevent Defects From Existing
- [depth-estimation](/depth-estimation): Monocular Depth Estimation — Accuracy, Latency, Model Size, and the Knobs That Actually Move Them
- [embedded-postgres](/embedded-postgres): Embedded PostgreSQL — Running Postgres Without a Server
- [emissary](/emissary): Emissary — Workflows Discovered from the Data, Not Drawn in Advance
- [export-controls](/export-controls): Export Controls Meet the Model — Capability as Munition, from Cipher Source to Live Inference
- [fancy-data-structures](/fancy-data-structures): Fancy Data Structures — Tries, Bloom & Cuckoo Filters, Aho-Corasick, LSM Trees, and the Aguri Trie
- [fly-io](/fly-io): Fly.io — When a Service Outgrows Its Sprite
- [grimoire](/grimoire): Grimoire — A Knowledge Base of Spells, Scrolls, and Lore
- [legal](/legal): Legal — Compliance Patterns for Services That Handle Other People's Data
- [lexicon](/lexicon): Lexicon
- [llms](/llms): Language Models — Patterns, Tools, and the Emerging Infrastructure
- [macaroons](/macaroons): Macaroons — A Field Guide to API Tokens, from Random Strings to Chained HMACs
- [progressive-disclosure](/progressive-disclosure): Progressive Disclosure — Showing the Right Thing at the Right Time
- [references](/references): References — Oracles, Archives, and Further Reading
- [resilience](/resilience): Resilience — How Complex Systems Fail
- [science](/science): Science — How to Learn on Purpose
- [seasons](/seasons): Seasons — Three Calendars for the Same Sun
- [serving](/serving): Serving Python Web Applications
- [skill-tree](/skill-tree): Skill Tree — Encoding Curricula as Prerequisite Graphs
- [snapshot-fork](/snapshot-fork): Forking a Sandbox — MicroVMs That Resume Instead of Boot
- [spaced-repetition](/spaced-repetition): Spaced Repetition — Algorithms for Scheduling Memory
- [sprites](/sprites): Sprites — The Container Platform Under Everything
- [sqlite](/sqlite): SQLite — Patterns for Small Services
- [sqlite-replication](/sqlite-replication): SQLite Replication — Litestream, LiteFS, and the Single-Writer Bet
- [tight-loops](/tight-loops): Tight Loops — Shifting Left on Defects Through Fast Feedback