persistent memory system for AI agents — single SQLite file, no external server, no API keys. free and opensource - BrainCTL

Reddit r/artificial / 4/11/2026

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BrainCTL is a free, open-source persistent memory system for AI agents that stores long-term context in a single local SQLite database file.
It provides features such as FTS5 full-text search, a knowledge graph, session handoffs, and a write gate to reject redundant memory entries.
The project is designed to run without an external server, without API keys, and without making LLM calls during memory operations.
It includes an MCP server with many tools (for Claude Desktop/VS Code) plus adapters for popular agent frameworks like LangChain and CrewAI.
Users can install it via pip and initialize it with a simple Brain(agent_id=...) workflow to resume context from prior sessions.

Every agent I build forgets everything between sessions. I got tired of it and built brainctl.

pip install brainctl, then:

from agentmemory import Brain

brain = Brain(agent_id="my-agent")

context = brain.orient() # picks up where last session left off

One SQLite file. FTS5 search. Knowledge graph. Session handoffs. Write gate that rejects redundant memories. MCP

server with 192 tools for Claude Desktop/VS Code. LangChain and CrewAI adapters included.

No outbound server, no API keys, no LLM calls for any memory operation. MIT licensed.

Best part is I dont want any of your money.

Happy to answer questions about the architecture.

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