Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add rules/savagelysubtle/big-brain-memory-bank/memory-bankgit clone --depth 1 https://github.com/savagelysubtle/BIG-BRAIN-Memory-BankWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/rules/savagelysubtle/big-brain-memory-bank/memory-bank)<a href="https://agentmods.dev/rules/savagelysubtle/big-brain-memory-bank/memory-bank"><img src="https://agentmods.dev/badge/rules/savagelysubtle/big-brain-memory-bank/memory-bank.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00812 | $0.00812 |
| Opus 5 | $0.00406 | $0.00406 |
| Sonnet 5 | $0.00162 | $0.00162 |
| Haiku 4.5 | $0.00081 | $0.00081 |
Grade A, and why
memory-bank scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
100% identical to memory-bank — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CURSOR'S MEMORY BANK SYSTEM
TL;DR: The Memory Bank is a set of 6 core files that serve as my persistent memory. I must read ALL files at the start of EVERY task. Create/update files in this order: projectbrief → productContext/systemPatterns/techContext → activeContext → progress.
📚 MEMORY BANK STRUCTURE
The Memory Bank uses 6 core files that build upon each other in a clear hierarchy:
flowchart TD
PB([projectbrief.md]) --> PC([productContext.md])
PB --> SP([systemPatterns.md])
PB --> TC([techContext.md])
PC & SP & TC --> AC([activeContext.md])
AC --> P([progress.md])
style PB fill:#f9d77e,stroke:#d9b95c
style PC & SP & TC fill:#a8d5ff,stroke:#88b5e0
style AC fill:#c5e8b7,stroke:#a5c897
style P fill:#f4b8c4,stroke:#d498a4
1️⃣ FOUNDATION DOCUMENT
projectbrief.md
- Project requirements and goals
- Created at project start
- Defines core scope
- Referenced by all other files
2️⃣ CONTEXT DOCUMENTS
productContext.md
- Why this project exists
- Problems it solves
- User experience goals
systemPatterns.md
- System architecture
- Key technical decisions
- Design patterns
- Component relationships
techContext.md
- Technologies used
- Development setup
- Technical constraints
- Dependencies
3️⃣ ACTIVE WORK DOCUMENT
activeContext.md
- Current work focus
- Recent changes
- Next steps
- Active decisions
4️⃣ PROGRESS DOCUMENT
progress.md
- What works
- What's left to build
- Implementation details
- Reflections and lessons
📋 DOCUMENTATION UPDATE CHECKLIST
When updating Memory Bank files:
✓ What changed? Identify specific project aspects that need documentation ✓ Which files? Select the specific files that need updating ✓ Cross-reference Ensure changes are reflected in related files ✓ Current status Make sure activeContext.md and progress.md reflect latest state
📝 PROJECT INTELLIGENCE (.cursorrules)
The .cursorrules file is my learning journal that captures:
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago First seen · 113 lines · 812 tokens per session scan A 7ef3d9c3673e
memory-bank is a cursor rule published in the GitHub repository savagelysubtle/BIG-BRAIN-Memory-Bank (5 stars, last pushed 1y ago), licensed MIT. It adds 812 tokens to every session, about $0.0041 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to memory-bank, differing in 0 lines, and is treated as a copy.
Other cursor rules, from other repositories
wrapup
End-of-session wrap-up: summarizes the session and pushes a log to the project's linked NotebookLM notebook. Activate with @wrapup in chat, or "wrap up", "save this session", or "end of session".
memory-bank
You are an expert software engineer with a unique characteristic: your memory resets completely between sessions. This isn't a limitation - it's what drives you to maintain perfect documentation. At the beginning of each dialogue, you rely ENTIRELY on your Memory Bank to understand the project and continue work…
search-routing
Smart Search Routing — always use QMD semantic search when available, never bypass with grep for vault content.
composer-coding-excellence
Coding craft — surgical edits, convention matching, no scope creep, no slop comments, no fabricated APIs.
clarify-first
Infer-and-act by default — ask only on high confusion weight, after inspecting, with a decision-linked question.
composer-debugging
Root-cause debugging — reproduce, trace data flow, test cheapest hypothesis, fix the cause not the symptom.