Ca Task Agent Skill

$ca-task — task-board writer

The one blessed way to mutate <project-root>/.codearbiter/open-tasks.md

(resolves D-1). Hand-editing the board is no longer the only path; this command keeps

every entry schema-conformant and every transition dated. The board LOGIC lives in the

pure _taskboardlib transforms; this command runs the thin writer

${CLAUDE_PLUGIN_ROOT}/hooks/taskwrite.py.

Verbs

Always put -- before user text (a desc or title) so a value beginning with - is not

parsed as a flag. Interpreter fallback, same shape as the hooks: python3 … || python ….

• add — append a queued task. ID-less by default; pass --id <group>.<type> to mint

a dotted ID now, --from <origin> for a harvest back-ref, --boundaries a,b for the

security/trust boundaries it touches. The description must be nonblank and

single-line; origin and boundary values must also stay on one line.

• python3 "${CLAUDE_PLUGIN_ROOT}/hooks/taskwrite.py" add [--id group.type] [--from origin] [--boundaries a,b] -- "<desc>" || python "${CLAUDE_PLUGIN_ROOT}/hooks/taskwrite.py" add ... -- "<desc>"
• start — flip a task to in-progress and stamp the started date (so it can never

be a dateless [~]). On an ID-less item, pass --as <group>.<type> to mint its dotted

ID at pick-up. --date YYYY-MM-DD overrides today.

• python3 "${CLAUDE_PLUGIN_ROOT}/hooks/taskwrite.py" start [--as group.type] [--date YYYY-MM-DD] -- "<id|title>"
• done — flip an in-progress task to done and stamp the done date (--date

overrides today). A queued task must be started first.

• python3 "${CLAUDE_PLUGIN_ROOT}/hooks/taskwrite.py" done [--date YYYY-MM-DD] -- "<id|title>"

A missing target, an already-matching state, an out-of-order transition, a malformed

add field or --date, or an invalid GROUP.TYPE namespace is reported and writes

nothing (exit 1).

A queued done identifies the task as queued and tells the caller to start it first.

Targeting by title is best-effort:

prefer the dotted ID, and

note that if two ID-less items share a title, start/done act on the first — give one

an ID ($ca-task start --as <group>.<type> -- "<title>") to disambiguate.

When NOT to use

• Promoting workflow follow-ups in bulk → that is the harvest

(${CLAUDE_PLUGIN_ROOT}/includes/harvest.md), which calls this writer for you.

• Reading the board / counts → $ca-status (read-only).
• Archiving long-settled done items → deferred (D-2); done items stay in-place for now.
• Filing a separate chore(board) PR just to flip a task state → task-board transitions

([x] done-flip, [~] start-flip, new [ ] add) ride the work commit via

commit-gate, co-located atomically with the code that completes, starts, or spawns the

task (ADR-0008). A lagging board-only PR is the anti-pattern this design eliminates.

Hard gate

• MUST write the board only through taskwrite.py (the pure transforms), never a

free-hand Edit that can malform the schema.

• start MUST stamp a started date — never leave a dateless [~].
• done MUST target an in-progress task — a queued task must go through start first.
• MUST NOT delete a task to "complete" it — mark it done so the record survives.