symbion

A per-project notebook and ticket registry for small projects, driven by a person and a coding agent through one CLI. The CLI stands alone; the agent side (a shared skill and a SessionStart hook) supports Claude Code and Codex. Hermes Agent takes the skill, and a line in AGENTS.md in place of the hook.

A note is dated, attributed, retractable, and attached to something stable: a commit, a file, a free-form item, or the whole project. Seven kinds by default: check (a dated verification), decision (an ADR), bug, task, question (needs the owner's answer), idea (parked) and note. A kind is a label on three bits (status, parked, verdict); declare your own under [kinds] in symbion.toml, and symbion schema prints the table. An arc is a named line of work (an epic), shown as a checklist of rows across objects. The store is a separate git repo of JSONL beside the project, so checking out an old branch never time-travels your tickets.

Design and rationale: docs/superpowers/specs/2026-09-04-symbion-design.md. The best command reference is the agent's: src/symbion/data/skill/SKILL.md (linked at ~/.claude/skills/symbion for Claude Code or ~/.agents/skills/symbion for Codex and Hermes Agent).

Install

Python 3.11+ and git. On Windows, use Git for Windows: catalogs and resolvers run in its sh, which symbion finds beside git even when only Git's cmd directory is on PATH. Claude Code runs the session-start hook in Git's bash; without Git for Windows it fails with 'sh' is not recognized. Codex's hook runs in Windows PowerShell.

pipx install 'symbion[gui]'     # or: uv tool install 'symbion[gui]'
# [gui] adds the web UI (symbion serve); drop it for the core alone.
# Unreleased main: pipx install 'symbion[gui] @ git+https://github.com/phreakocious/symbion'

The core's three dependencies serve a person at a terminal: rich and rich-argparse colour and align the output (a pipe gets plain text), and argcomplete does TAB completion.

To work on symbion itself, install a clone editable: pipx install -e /path/to/symbion (or uv tool install -e). Without pipx or uv:

cd /path/to/symbion
python3 -m venv .venv && .venv/bin/pip install -e .
ln -s "$PWD/.venv/bin/symbion" ~/.local/bin/symbion   # any directory on PATH

Then run command -v symbion from another directory. The SessionStart hook finds symbion through PATH. Without it, the hook prints only symbion: cannot read store at … because 'symbion' is not on PATH in a project that adopted symbion, and nothing elsewhere.

TAB completion. Add your shell's line to its rc file:

eval "$(symbion completion zsh)"     # ~/.zshrc, after compinit
eval "$(symbion completion bash)"    # ~/.bashrc
symbion completion fish | source     # ~/.config/fish/config.fish

In zsh you can instead save the output as _symbion in a directory on $fpath (oh-my-zsh: $ZSH_CUSTOM/completions). It stays out of a shared rc file and loads on the first TAB, not at every shell start. Regenerate it after an argcomplete upgrade.

TAB completes verbs, flags and the store's values: kinds, target types, the TYPE:NAME targets its rows use, row ids (only open ones for resolve), arc ids and tags. zsh and fish describe each value. A --dir on the line picks the store.

Adopt in a fresh repo

From the repo's root:

1. Create the store and link the agent files.

symbion init          # lists each change and makes none (exit 1 if there are any)
symbion init --yes    # makes them

That sets up Claude Code; --agent codex sets up Codex instead, --agent both sets up both, and --agent hermes sets up Hermes Agent.

This creates ../<repo>-notes, a git repo with no remote, holding a commented symbion.toml whose every value has a default and a README.md that says what the store is. For Claude Code, the first init on a machine also links ~/.claude/skills/symbion to the skill directory in the installed package (SKILL.md, adoption.md, catalogs.md and the hook script), so an upgrade reaches every project. It registers the hook in ~/.claude/settings.json when that file does not exist. When it does, init says the hook is already there, or prints the entry to append to hooks.SessionStart (it merges nothing), or says the file is not valid JSON. A ~/.claude/skills/symbion that is not the link is left alone and named. On Windows the link is a directory junction when the account cannot make a symlink, so neither Developer Mode nor an elevated terminal is needed.

For Codex, init --agent codex links ~/.agents/skills/symbion to the same skill directory and registers the hook in $CODEX_HOME/hooks.json (default ~/.codex/hooks.json), on the same terms: it writes that file only when it is absent, and counts a registration inline in config.toml. Codex skips a new hook until you trust it in /hooks. See the Codex hook documentation. On macOS and Linux the command runs session_start.sh. On Windows, init adds a commandWindows override running session_start.ps1 with Windows PowerShell, without loading a profile. WSL is not required. Both commands read the session's cwd and use codex as the reader unless SYMBION_AUTHOR overrides it.

Give Codex access to the store. Codex's sandbox writes only inside the project, and the store sits beside it. Launch codex --add-dir ../<repo>-notes, or add the store to sandbox_workspace_write.writable_roots in Codex's config.toml; init prints the path. A .symbion pointer grants no access, and symbion commit may still ask for approval. A linked worktree uses the main checkout's store, so grant that one.

For Hermes Agent, init --agent hermes makes the same ~/.agents/skills/symbion link and registers no hook: no Hermes hook puts text in front of the model once, at session start. Hermes reads the link once $HERMES_HOME/config.yaml (default ~/.hermes/config.yaml) lists the directory. init does not edit that file, so add it yourself:

skills:
  external_dirs:
    - ~/.agents/skills

The summary then comes from a line in the project's AGENTS.md (step 3). Hermes's default local terminal writes to the store beside the project with no further setup.

The only file init writes into the project is a .symbion pointer, when the store is not the default sibling. It marks the pointer (git: ignored) or (git: not ignored); a not-ignored one goes in with your next git add -A. The hook runs in every project and says nothing where there is no store.

2. Check the read side. Start a session, or run the hook by hand:

CLAUDE_PROJECT_DIR=$PWD sh ~/.claude/skills/symbion/session_start.sh
sh ~/.agents/skills/symbion/session_start.sh     # the same, with only Codex set up

For Codex on Windows, run this from the project in PowerShell:

powershell.exe -NoProfile -NonInteractive -ExecutionPolicy Bypass -File "$HOME\.agents\skills\symbion\session_start.ps1"

Hermes Agent has no hook to run: start a session after step 3, and its first command should be symbion summary.

3. Tell the agent. One line in CLAUDE.md (Claude Code) or AGENTS.md (Codex, Hermes Agent):

- We use symbion for durable notes and tickets. Surface friction with it so it can be addressed.

Hermes Agent runs no hook, so it needs a second line. Hermes reads only the first of .hermes.md, AGENTS.override.md, AGENTS.md and CLAUDE.md it finds in the project, so put the line in that file:

- At the start of a session, run `symbion summary` unless a hook already printed it.

If that instruction file is gitignored or its owner reviews every change to it, propose the line to the owner instead of writing it.

First session

A repo with history (known issues, TODOs, docs, a handoff file) starts with adoption.md, installed beside SKILL.md. It says which catalogs to turn on and what to bring in; its rows go in as one symbion add --from-json -, validated together before any is written. Either way:

The first note is a check, written now: the state the store began at, which no commit message records. It pays first: dated, re-checkable, and visibly stale once HEAD moves. A check stamps HEAD and whether the tree is dirty, untracked files included, so on a dirty tree (the instruction line from step 3) it reads unverifiable (dirty tree). Commit, write it again, and it reads current. Files the checked command writes count too, so git-ignore __pycache__/ before checking pytest. A check on something outside the repo (DNS, a host) takes --external and shows its age instead.

symbion add check --target commit:HEAD --checked "pytest -q" --result "147 passed"
symbion list --kind check    # unverifiable when dirty, current when clean, behind N once HEAD moves

The first checklist is an arc over free-form items. add each item with a body. seed mints one bodiless task per name and is for fanning out over a catalog.

aid=$(symbion arc create --name "Adoption" --scope item --desc "Usable by someone who was not in the room.")
symbion add task --target "item:write the README" --arc-id "$aid" --body "Done: a stranger can install and record a note."
symbion arc todo "$aid" --json      # open items
symbion resolve <id>                # tick one
symbion arc list                    # done/total per arc
symbion list --arc "$aid" --json    # every item, resolved included

Commit the store at session end. Writes never commit, so a git failure never blocks a note; symbion summary shows the uncommitted count until you do.

symbion commit -m "adoption: README ticket closed"
symbion push         # when the store has a remote

commit says no remote while the store has none. A store kept on one disk on purpose takes local_only = true in its symbion.toml, and commit stops saying so.

Browse it (optional)

symbion serve        # the one command that needs the gui extra

A local page on a port of the store's own, the same at every restart, so a link to a row stays good (serve prints it, and --port picks another). It has:

• boards: by kind on the notebook, by target on the targets page;
• a note list where every tag, kind, author and target is a filter link;
• a search box (/): its text filters the page as you type, and Enter searches the whole store (every word, literally, in any case, or a pasted note id), as a pause in the typing does once nothing on the page matches;
• a new note from any page (n), on that page's object or any other: #tag and !kind in its body set its tags and kind, and Shift Enter adds it and starts the next;
• a page per note with its earlier versions, a tag index, and arc checklists you tick;
• commit and push buttons, shown while there is something to commit or push.

? lists the keys. It writes as you: SYMBION_AUTHOR, else git user.name, shown at the foot of the sidebar, or in the top bar on a window too narrow for one. --author NAME overrides.

One serve per store: run it in each project, and each one's sidebar links the other stores a serve is running on, on this machine. Each running serve keeps a small record in ~/.cache/symbion/serve/ (or under $XDG_CACHE_HOME). A second serve on one store warns: the sidebars link the first until it stops, then the second. While a serve runs on a store, each id that list, show and context print at a terminal links to its row's page (cmd-click in iTerm2), and summary names the URL.

Catalogs, when a homogeneous set exists

A catalog is a shell command that prints one name per line. Declare it in the store's symbion.toml:

[catalogs]
file = "git ls-files --cached --others --exclude-standard '*.py'"
test = "git ls-files --cached --others --exclude-standard 'tests/test_*.py'"

[renames]
file = "git"     # so reconcile can follow renamed files

Each key becomes a target type (--target file:src/x.py). An arc seeded over it gets one task per member, and arc reconcile reports which are live, renamed or stale as the tree changes.

Scope the command to where notes attach: no pathspec when docs and results matter, a glob when only code does. A broad catalog costs only a refusal on an ambiguous substring. Keep --others --exclude-standard: without it, a note on a file made this session warns taken as typed on a correct name, and that warning is the only thing that catches a typo.

Dry-run the first seed of every catalog type. What a command prints depends on the tool's version and the project's config:

symbion arc seed --scope file --dry-run     # no arc needed; writes nothing

Names resolve exact, then unique substring, then the one name equal but for case, else as typed. cli.py matches both src/symbion/cli.py and tests/test_cli.py, so it is refused: use the full path.

A catalog of measured names (a reading, a serial) needs a resolver, or a near-miss mints a second target: substring matching cannot see that 3.1416 is 3.14159. So does every store-derived catalog (symbion list … --type X | jq …): it is empty until its first X row exists, so without a resolver that first add is refused.

[resolvers]
reading = "python3 tools/resolve_reading.py"   # stdin: query, then names; exit 2 = ambiguous

The starter symbion.toml documents the protocol. A failing resolver stores nothing; it never falls back to substring matching.

Within one write (add --from-json, arc seed --name …), names resolved by earlier rows are candidates for later ones. A batch naming src/parser.py and then p, against a catalog holding src/pipe.py, is refused as ambiguous where two separate adds would store both.

Conventions

• Bodies are markdown. list --full, show and context render them on a terminal and print them as written on a pipe; a plain list page and summary flatten each to one clipped line.
• A terminal and a pipe get different text. A terminal gets columns: the id's last 10 characters (which show takes), age, a ○/✓ status mark, kind, target, tags, a ref count, and one body line cut to fit. A pipe, which scripts and agents read, gets the plain line.
• Parked means parked. An idea never prints in arc todo or context, and prints in summary only when its --due date is near or past, or when someone other than the reader wrote it (from <author>). Close one with resolve <id> --add-tag adopted --body "why" or --add-tag retired. list --kind idea is the shelf.
• Kinds are the project's. Add or rename labels under [kinds] in symbion.toml; renaming one that has rows also takes a one-line sed over notes.jsonl, which init writes into the toml. A kind with both status and verdict is a pre-registration, closed by resolve --result. A kind can pick its colour by a palette name, color = "teal", in the terminal and in serve; a declared kind without one shares lavender, and a name outside the palette is refused with the list. symbion 0.3.0 and older refuse the key, so every machine that reads the store needs a newer one.
• priority stars a row for the next session's summary: supersede <id> --add-tag priority, until the row is resolved or --rm-tag priority takes the star off. From a day on, the summary prints its age.
• Due dates. --due 2026-10-01 (or an ISO datetime) on any status row. An open row past due or due within 7 days leads the session-start summary (overdue 2d, due in 3d). list --overdue lists those past due, and supersede <id> --due '' clears one.
• Time is UTC. Rows are stamped in UTC, and symbion prints times and reads a bare date in UTC. Set TZ to print and read them in that zone instead.
• Author. claude inside a Claude Code session, codex inside a Codex one, hermes inside a Hermes Agent one, else git user.name; --author or SYMBION_AUTHOR overrides. A person typing ! symbion add … in a session is recorded as the agent unless they pass one. Session start lists the open rows someone other than the reader raised or amended, parked ones included, so the owner's word reaches the agent: from <author> names who raised a row, and last by <author> who wrote its newest version when that is someone else.
• Record finished work as a resolved task: add task --target … --status resolved --body "done: …" for work done before it had a ticket.

Where things live

• Store: ../<repo>-notes, beside the main worktree; linked worktrees share it. SYMBION_DIR or --dir PATH (anywhere in the argv) override. A store named from another repo, or a command run inside a store (to edit symbion.toml, say), resolves in the store's own repo. A write or a catalog run says so on stderr. init inside a store refuses.

• A store not named after its repo: put its path in a .symbion file in the repo root (first non-blank line; relative to the main checkout, or absolute; a file, not a link to the store). A linked worktree's pointer counts while the main checkout has none, as on a branch that adopts symbion. symbion --dir ../other-notes init --yes writes it. If the repo already reads a store that exists, init creates the new store and leaves the pointer alone; --repoint changes it. Commit it; a relative path survives a clone. It cannot live in symbion.toml, which is inside the store it has to find. Set it whenever the names differ: after a repo directory is renamed, every command, writes included, reports no store at ../<new-name>-notes until a .symbion names the old store. A note under that error names any store beside the repo that no project claims, by its name or by a pointer.

• Files: notes.jsonl (append-only once committed: a correction is a new row that supersedes the old one; before symbion commit, an edit to your own row rewrites it), arcs.jsonl, symbion.toml.

• Secrets: a store is a git repo, so any pre-commit hook guards it; symbion ships none. gitleaks, for one, scans only what a commit adds, from the store's .git/hooks/pre-commit:

  exec gitleaks git --pre-commit --staged --redact --no-banner --no-color -v -l warn .
  

  A refusal names a line of notes.jsonl, and symbion commit commits nothing. symbion supersede <id> --body … rewrites your own uncommitted row in place, so the secret never reaches history. A row someone else wrote, or one another row cites, gets a new row instead: edit that line out of notes.jsonl by hand.

• Reading: symbion summary (what the hook prints), symbion context --target TYPE:NAME, symbion context --branch REF, symbion list --json. Every command that prints rows takes --json.

Development

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

On Windows, in PowerShell:

python -m venv .venv
.\.venv\Scripts\python.exe -m pip install -e '.[test,gui]'
.\.venv\Scripts\python.exe -m pytest -q

The specs in docs/superpowers/specs/ are dated design records: why each decision was made. SKILL.md (in src/symbion/data/skill/, beside adoption.md and the hook) is what an agent reads; keep it short and its footgun list honest. If this clone is your installed symbion (an editable install, then symbion init --yes), ~/.claude/skills/symbion and, with --agent codex or --agent hermes, ~/.agents/skills/symbion link to that directory, so an edit there reaches every session on the machine at once, as an edit to src/ reaches every symbion call.