ذهن — "the mind"
Find any prompt you have ever typed to an AI coding agent, then drop back into that session.
Install · Usage · Sources · Matching
Works with
Claude Code
Codex
opencode
You use claude one day, codex the next, then pi or opencode after that. A week later you want the thing you asked for back then, but you cannot remember which agent you said it to, let alone which project. So you go digging through four different history formats by hand.
zehn reads all of them at once. It pulls every prompt you have sent to claude, codex, pi, and opencode into a single fuzzy-searchable list. You type a few letters, find the prompt, hit Enter, and it puts you back in that exact session in the agent that owns it.
It is one small Zig binary with no runtime dependencies (sqlite3 is optional, and only for opencode). On my machine it reads and parses about 1,300 sessions in roughly 0.2 seconds.
One line, macOS or Linux:
bash <(curl -L https://al3rez.com/zehn)It clones the repo, does a ReleaseFast build, and leaves the binary at ~/.local/bin/zehn. If you don't already have Zig 0.16+, it grabs it for you — via brew/pacman when present, otherwise the official tarball from ziglang.org. Set PREFIX to install somewhere else (PREFIX=/usr/local bash <(curl -L ...)), or NO_INSTALL_ZIG=1 to make it refuse rather than fetch Zig.
Prefer to do it by hand? You'll need Zig 0.16 or newer.
git clone https://github.com/al3rez/zehn && cd zehn
zig build -Doptimize=ReleaseFast --prefix ~/.localEither way, make sure ~/.local/bin is on your PATH. If you would rather not install it anywhere, the build also leaves a copy at zig-out/bin/zehn.
Just run it:
zehnType to filter. Use the arrow keys or ^p/^n to move. Press Enter on a prompt and zehn cds into that session's project directory and runs the agent's resume command for you. If the project folder is gone, it falls back to your current directory and tells you.
If you do not want it to launch anything, the other modes just print:
zehn --print # print the prompt text of whatever you select
zehn --project # print agent <tab> project <tab> text
zehn --list # dump everything, no UI
zehn --versionKeys: type to filter, ↑/↓ or ^p/^n to move, Enter to pick, Esc or ^c to quit.
| Agent | History location | Resume command |
|---|---|---|
| claude | ~/.claude/history.jsonl |
claude --resume <id> |
| codex | ~/.codex/history.jsonl |
codex resume <id> |
| pi | ~/.pi/agent/sessions/*/*.jsonl |
pi --session <id> |
| opencode | ~/.local/share/opencode/opencode.db (SQLite) |
opencode --session <id> |
Each agent shows up in its own brand color, so you can tell at a glance whether a result came from claude or codex. Duplicate prompts collapse into one (keeping the most recent), and when two results score the same, the newer one wins.
opencode keeps its history in a SQLite database, so reading it needs the sqlite3 CLI on your PATH. If it is missing, zehn skips opencode and says so instead of failing.
The search is not a plain substring filter. It is an fzf-style optimal alignment: a Smith-Waterman variant with affine gap penalties and extra credit for letters that land on word boundaries, camelCase humps, or in an unbroken run. In practice that means typing auth surfaces "add auth middleware" above some prompt where a, u, t, h happen to be scattered across the line.
"Optimal" is not a marketing word here. A test runs the matcher against a brute-force reference over thousands of random inputs and checks that the scores come out identical.
zig build test # unit tests: matcher + all four parsers
zig build run -- --listThe matcher lives in src/fuzzy.zig, the per-agent parsers in src/scan.zig, and the terminal UI in src/tui.zig.
zehn (ذهن) means "the mind" in Persian and Arabic. It is short, it is easy to say (close to "zen"), and a tool whose whole job is remembering what you said to which agent might as well be named after memory.
MIT.