MCP Knowledge Graph

Persistent memory for AI models through a local knowledge graph.

Store and retrieve information across conversations using entities, relations, and observations. Works with Claude Code/Desktop and any MCP-compatible AI platform.

Why ".aim" and "aim_" prefixes?

AIM stands for AI Memory - the core concept of this system. The three AIM elements provide clear organization and safety:

• .aim directories: Keep AI memory files organized and easily identifiable
• aim_ tool prefixes: Group related memory functions together in multi-tool setups
• _aim safety markers: Each memory file starts with {"type":"_aim","source":"mcp-knowledge-graph"} to prevent accidental overwrites of unrelated JSONL files

This consistent AIM naming makes it obvious which directories, tools, and files belong to the AI memory system.

CRITICAL: Understanding .aim dir vs _aim file marker

Two different things with similar names:

• .aim = Project-local directory name (MUST be named exactly .aim for project detection to work)
• _aim = File safety marker (appears inside JSONL files: {"type":"_aim","source":"mcp-knowledge-graph"})

For project-local storage:

• Directory MUST be named .aim in your project root
• Example: my-project/.aim/memory.jsonl
• The system specifically looks for this exact name

For global storage (--memory-path):

• Can be ANY directory you want
• Examples: ~/yourusername/.aim/, ~/memories/, ~/Dropbox/ai-memory/, ~/Documents/ai-data/
• Complete flexibility - choose whatever location works for you

Storage Logic

File Location Priority:

1. Project with .aim - Uses .aim/memory.jsonl (project-local)
2. No project/no .aim - Uses configured global directory
3. Contexts - Adds suffix: memory-work.jsonl, memory-personal.jsonl

Safety System:

• Every memory file starts with {"type":"_aim","source":"mcp-knowledge-graph"}
• System refuses to write to files without this marker
• Prevents accidental overwrite of unrelated JSONL files

Master Database Concept

The master database is your primary memory store - used by default when no specific database is requested. It's always named default in listings and stored as memory.jsonl.

• Default Behavior: All memory operations use the master database unless you specify a different one
• Always Available: Exists in both project-local and global locations
• Primary Storage: Your main knowledge graph that persists across all conversations
• Named Databases: Optional additional databases (work, personal, health) for organizing specific topics

Key Features

• Master Database: Primary memory store used by default for all operations
• Multiple Databases: Optional named databases for organizing memories by topic
• Project Detection: Automatic project-local memory using .aim directories
• Location Override: Force operations to use project or global storage
• Safe Operations: Built-in protection against overwriting unrelated files
• Database Discovery: List all available databases in both locations

Quick Start

Global Memory (Recommended)

Add to your claude_desktop_config.json or .claude.json. Two common approaches:

Option 1: Default .aim directory (simple)