elfmem: Instructions file for Claude Code

CLAUDE.md

elfmem CLAUDE.md is an instructions file for Claude Code from emson/elfmem. It costs 3,404 tokens per session, scanned A, original, MIT.

A memory system for AI agents that stores knowledge in SQLite, a database kept in a local file. It describes how agents learn, combine related memories, archive old information, and choose context for different tasks.

In plain words
What is it for?
Use it to add memory to an agent, consolidate new information, detect duplicates or contradictions, archive less useful memories, and select context for a task or simulated viewpoint.
Why use it?
It gives an agent a way to retain useful information between interactions without requiring separate infrastructure, while allowing outdated knowledge to fade or be reviewed.

Instructions file for Claude Code

Written for Claude Code: UserPromptSubmit hook event. Also seen: reads .claude/ paths; mentions Claude Code; mentions AGENTS.md.

This is emson/elfmem's own configuration. It tells Claude Code how to work on elfmem itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything elfmem configures →

Not installable: its command points at a path on the author’s own machine, so it runs nowhere else. The line is /Users/emson/.elfmem/databases/elfmem.db.

View source ↗ emson/elfmem
Reuse

Borrowing it

Nothing to install: this file belongs to emson/elfmem. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/emson/elfmem/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/emson/elfmem

Made for: Claude Code.

Wrote 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.

agentmods badge for elfmem CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/emson/elfmem/claude-md/github.svg)](https://agentmods.dev/instructions/emson/elfmem/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/emson/elfmem/claude-md"><img src="https://agentmods.dev/badge/instructions/emson/elfmem/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for elfmem CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/emson/elfmem/claude-md"><img src="https://agentmods.dev/badge/instructions/emson/elfmem/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 3,404 This file is loaded in full into every session.
When invoked 3,404 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.03404 $0.03404
Opus 5.5 $0.01362 $0.01362
Sonnet 5.5 $0.00681 $0.00681
Haiku 4.5 $0.00340 $0.00340

Measured 2mo ago against content hash e369d529574e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

elfmem CLAUDE.md 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 2mo 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.

CLAUDE.md · 265 lines

How it starts

The opening of the file, as written. The whole thing — 265 lines — stays where its author put it; the contents beside it link to each section on GitHub.

elf — Adaptive Memory for LLM Agents

elf (elfmem package) is a self-aware adaptive memory system. Agents learn, reinforce, and forget knowledge the way biological memory works — fast ingestion, deep consolidation at pauses, decay-based archival at rest. SQLite-backed. Zero infrastructure.

Core Mental Model

Four rhythms (every design decision maps to one of these):

  • Heartbeat — learn(): milliseconds, no LLM, pure inbox insert
  • Breathing — dream() / consolidate(): seconds, LLM-powered dedup + contradiction detection
  • Sleep — curate(): minutes, decay archival + graph pruning + top-K reinforcement
  • Deep Sleep — dream(rescore=True) / rescore(): re-evaluates aged active blocks against the current SELF; keeps alignment / summary / tags fresh as the agent's identity drifts (v0.13.3)

Four frames — always select before retrieving context: self · attention · task · simulate (simulate is the Theory-of-Mind frame: blends self constitution with mind/* blocks to reason about modelled minds.)

Knowledge lifecycle: BIRTH → GROWTH → MATURITY → DECAY → ARCHIVE Decay is session-aware (holidays don't kill knowledge). Reinforcement resets the clock.

Code Style

SIMPLE · ELEGANT · FLEXIBLE · ROBUST — full patterns in docs/coding_principles.md

  • Functional Python — pure functions, input → output, compose pipelines from ≤50-line functions
  • Fail fast — exceptions bubble up; catch only at CLI/MCP system boundaries
  • No defensive code — no broad except, no try/except in business logic
  • Complete type hints — every function, public and private
  • Docstrings follow this template on every public method:
    USE WHEN: …   DON'T USE WHEN: …   COST: …   RETURNS: …   NEXT: …
    
  • AgentGuide required: every new public MemorySystem method must have a corresponding AgentGuide entry in src/elfmem/guide.py GUIDES dict before the PR merges. This is what makes elfmem guide authoritative and keeps user project CLAUDE.mds permanently correct.

Read the full file on GitHub · 265 lines

Changes

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.

  1. 2mo ago First seen · 265 lines · 3,404 tokens per session scan A e369d529574e

Subscribe to this mod's changes

elfmem CLAUDE.md is an instructions file published in the GitHub repository emson/elfmem (59 stars, last pushed 1mo ago), licensed MIT. It adds 3,404 tokens to every session, about $0.0136 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

elfmem CLAUDE.md compared with instructions from other repositories

elfmem CLAUDE.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
elfmem CLAUDE.mdemson/elfmemInstructions file591mo agoMITA3,404Claude Code
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143ktodayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode