# Claude-Mem: Persistent Long-Term Memory for AI Coding Agents > Source: > Published: 2026-09-02 21:20:40+00:00 One of the most persistent hurdles in working with command-line AI coding assistants (such as Claude Code, Antigravity CLI, and OpenCode) is context fragmentation across sessions. When a developer ends a terminal session, the agent's working context is wiped clean. The next day, the developer must re-explain architectural decisions, project conventions, and previously resolved edge cases. **claude-mem** is an open-source memory compression and retrieval engine created by thedotmack. It passively monitors developer interactions, compresses key discoveries into structured observations, and seamlessly primes future agent sessions with relevant context. `claude-mem` operates as an intelligent background memory worker. Rather than dumping raw conversation transcripts into future prompt windows—which rapidly drains token budgets—`claude-mem` extracts semantic summaries of bug fixes, architectural choices, and dependency discoveries. When a new session starts, the agent queries its memory database to recall pertinent project history before writing code. `claude-mem` hooks into five critical lifecycle stages (SessionStart, UserPromptSubmit, PostToolUse, Stop, and SessionEnd). It documents what worked, what failed, and why, without requiring manual intervention from the engineer. To preserve context window capacity, `claude-mem` implements a tiered retrieval model: Search queries leverage both lexical matching and vector similarity. Whether an engineer searches for an exact error string or asks conceptually about "how auth tokens are signed," the engine finds the corresponding record. The engine includes a lightweight local web dashboard displaying active memory streams. Developers can inspect, edit, or remove stored observations, or wrap proprietary strings in `` tags to exclude them from persistence. Claude-Mem can be installed globally or through native plugin marketplaces: ``` # Automated setup npx claude-mem install # Or inside Claude Code /plugin marketplace add thedotmack/claude-mem /plugin install claude-mem ``` As software engineering workflows increasingly transition to autonomous terminal agents, long-term memory becomes a foundational requirement. `claude-mem` provides a clean, token-efficient foundation that turns isolated coding sessions into an evolving, shared intelligence layer. *Want to eliminate session amnesia in your coding agent? Check out the Claude-Mem GitHub Repository.*