symbion

A notebook and ticket registry for one project, shared by you and your coding agent. Bugs, tasks, decisions and verified results go in as dated notes, so what a session learned is still there when the next one starts.

What it does for you

• Each session starts where the last one stopped. A session-start hook gives the agent the open bugs, tasks and questions, the rows due soon, and the ones you wrote or answered. You do not brief it again.
• A result knows its age. A check records what ran, what it said, and the commit it ran at. Once the code moves on, it reads behind 12, not "tests pass".
• Questions go both ways. The agent files a question for you. Your answer, from a terminal or the browser, reaches its next session.
• Notes attach to things. A note sits on a commit, a file, a named item or the whole project, so symbion context --target file:src/x.py finds every note on that file.
• Checklists across a codebase. An arc is a named line of work with one box per item: a file, a test, a host. symbion arc reconcile reports the boxes whose file was renamed or deleted.
• Plain files you own. The notes are JSONL in a git repo beside the project. There is no server, account or database. Checking out an old branch does not change your tickets.
• A local web page, if you want one. symbion serve gives boards, search, and a page per note.

symbion works with Claude Code, Codex and Hermes Agent, and the CLI works without any of them.

Install

Python 3.11+ and git. On Windows, use Git for Windows.

pipx install 'symbion[gui]'     # or: uv tool install 'symbion[gui]'

[gui] adds the web page (symbion serve); leave it out for the CLI alone. Run command -v symbion from another directory to check that it is on PATH: the session-start hook finds symbion through PATH.

Quick start

From your project's root:

symbion init          # lists each change and makes none (exit 1 if there are any)
symbion init --yes    # creates the store, ../<repo>-notes, and links the agent skill

init --yes registers the session-start hook too when ~/.claude/settings.json does not exist. When it does, init prints the entry to add, or says the hook is already there.

A new store takes notes on a commit, an item, the project or an arc. For notes on files, open ../<repo>-notes/symbion.toml and uncomment file = under [catalogs] and file = "git" under [renames]. A file target refused before then names both lines.

Then add one line to CLAUDE.md, and start a session:

- We use symbion for durable notes and tickets.

init --agent codex, --agent hermes or --agent both sets up the other agents, which take a step more: see the guide.

Docs

• Guide: install on each platform, TAB completion, adopting a repo with each agent, the first session, and the web page.
• Reference: kinds and arcs, catalogs, conventions, where things live, and development.
• SKILL.md: what the agent reads, with a table of the common commands. symbion VERB -h lists every flag of a verb.
• Design: why symbion is built as it is.

Development

python3 -m venv .venv && .venv/bin/pip install -e '.[test,gui]'
.venv/bin/python -m pytest -q

Windows, and making a clone your installed symbion: Development.