mem — session memory for Claude Code

Claude forgets everything between sessions. mem fixes that in two steps:

1. Teaches Claude to maintain MEMORY.md — adds a rule to ~/.claude/CLAUDE.md so Claude updates the file at the end of every session with decisions, rejections, and patterns.
2. Injects MEMORY.md at session start — wires a SessionStart hook so Claude opens every session with full project context already in mind.

curl -fsSL https://raw.githubusercontent.com/HugoLopes45/mem/main/install.sh | bash

That's it. One command, zero manual config.

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How it works

mem init
  → adds rule to ~/.claude/CLAUDE.md   (Claude writes MEMORY.md at session end)
  → wires SessionStart hook             (MEMORY.md injected at session start)

Every session:
  start  → mem session-start injects MEMORY.md into Claude's context
  end    → Claude updates MEMORY.md per the rule (decisions, rejections, patterns)

The file lives at your project root. Claude reads it, Claude maintains it.

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Commands

mem init              # setup: wire hook + add rule to CLAUDE.md
mem status            # verify: hook installed? rule present? files indexed?
mem index             # index all MEMORY.md files for search
mem search <query>    # search across all indexed MEMORY.md files

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What goes in MEMORY.md

Claude writes this automatically. Example after a few sessions:

# myproject

- Auth: JWT, not sessions — mobile client needs stateless (2026-02-18)
- Tried Prisma, switched to raw SQL — too much magic for this schema
- Don't use `any` — Biome enforces strict types, CI will fail
- Payment webhooks must be idempotent — Stripe retries on timeout
- DB migrations: always add column nullable first, backfill, then add constraint

Decisions, rejections, patterns. Things Claude would otherwise ask about again.

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Install

curl -fsSL https://raw.githubusercontent.com/HugoLopes45/mem/main/install.sh | bash

From source

cargo install --git https://github.com/HugoLopes45/mem --locked
mem init

Requires Rust 1.75+.

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Verify

mem status

Binary    : /Users/you/.cargo/bin/mem
Hook      : installed
Rule      : installed
Indexed   : 3 MEMORY.md file(s)

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Search across projects

mem index                    # index all MEMORY.md files
mem search "jwt"             # find decisions across all projects
mem search "rejected"        # find things you decided not to do

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License

MIT — see LICENSE.