AgentIndex icon
AgentIndex
agent-shadow-brain logo
agent-shadow-brain
★ 38
vs
lean-ctx logo
lean-ctx
★ 3.9k

agent-shadow-brain vs lean-ctx

agent-shadow-brain: Shadow Brain is the first open-source shared memory and context system for AI coding agents. It allows multiple agents and sub-agents to share a common brain, with features like causal memory chains, dream engine, reputation ledger, and more. It works with 10+ agents and is free and local-first.; lean-ctx: lean-ctx is an open-source MCP server designed to drastically reduce LLM token costs for AI coding tools like Claude Code, Cursor, and Copilot. It achieves this by transparently compressing CLI output and file context, offering up to 99% savings and making AI coding faster, cheaper, and more effective without changing workflows.

01

TL;DR

agent-shadow-brain logo
agent-shadow-brainCode Assistant · ★ 38

Eliminate cold starts: every new agent session gets a 2K-token briefing from past knowledge

Read agent-shadow-brain full review →
lean-ctx logo
lean-ctxMemory & Context · ★ 3.9k

Reducing token costs for Claude Code, Cursor, and Copilot

Read lean-ctx full review →
02

Side-by-Side Comparison

Field
agent-shadow-brain logoagent-shadow-brain
lean-ctx logolean-ctx
Category
Code Assistant
Memory & Context
Stars
★ 38
★ 3.9k
License
MIT
MIT
Install Command
npx @theihtisham/agent-shadow-brain@latest attach-all
curl -fsSL https://leanctx.com/install.sh | sh && lean-ctx setup && lean-ctx doctor
Updated
4mo ago
1d ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
ai, causal-chains, claude-code
agentic-coding, ai, ai-coding
03

Features

agent-shadow-brain logoagent-shadow-brain
01Sub-Agent Brain Bridge (SABB) – sync brain context into sub-agents
02Causal Memory Chains – traceable decision DAG with Graphviz export
03Dream Engine – idle-time reflection with counterfactual analysis
04Swarm Debate Protocol – pro/con/arbiter sub-agents for critical decisions
05Agent Reputation Ledger – Ed25519-signed receipts and accuracy scores
lean-ctx logolean-ctx
01Transparent shell hook for CLI output compression
02Context server with 28 intelligent tools
03One-command integration for AI coding agents
04Adaptive LLM communication with Cognitive Efficiency Protocol
05Cross-session memory for context continuity
04

Use Cases

agent-shadow-brain logoagent-shadow-brain
↳Eliminate cold starts: every new agent session gets a 2K-token briefing from past knowledge
↳Cross-agent context sharing: what one agent learns, all agents inherit
↳Traceability and trust: every AI decision is signed and causally linked
lean-ctx logolean-ctx
↳Reducing token costs for Claude Code, Cursor, and Copilot
↳Optimizing MCP server performance
↳Saving $30-100+ per month on AI coding API costs
FAQ

FAQ

What is the difference between agent-shadow-brain and lean-ctx?
Both agent-shadow-brain and lean-ctx are in the Code Assistant category. agent-shadow-brain has 38 stars, while lean-ctx has 3.9k stars.
Which is better, agent-shadow-brain or lean-ctx?
The best choice depends on your use case. Choose agent-shadow-brain if Eliminate cold starts: every new agent session gets a 2K-token briefing from past knowledge, and lean-ctx if Reducing token costs for Claude Code, Cursor, and Copilot.
Is agent-shadow-brain free or open source?
Yes, agent-shadow-brain is open source on GitHub (MIT).
Is lean-ctx free or open source?
Yes, lean-ctx is open source on GitHub (MIT).
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