# Memo > Update branch memory files after completing work. Saves session history, key learnings, and collaboration observations to .trinity/ files. Use when this capability is needed. - Skill: `tomevault-io/memo` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/memo` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/memo/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/memo --- # Memory Update Purpose: Update branch memory files after completing work this session. ## Execution 1. Read `.trinity/passport.json` first — re-absorb your identity, role, and principles before writing memories 2. Review what was done this session (context, recent changes, key decisions) 3. Update each file below as needed 4. Confirm completion — list files updated ## What to Update ### Always - **.trinity/local.json** — Add new session entry to `sessions` if significant work was done. Add new `key_learnings` for facts you'd need next time. - **.trinity/observations.json** — Add notable collaboration insights: breakthrough moments, pattern corrections, flow states, friction points, preference discoveries. Skip if nothing notable this session. ### Entry shape — one rule for all four types `key_learnings`, `sessions`, `todos` (local.json) and `observations` (observations.json) all share ONE shape: a **list of objects, newest at the top (index 0)**. Every entry carries a **`number`** (monotonic int per type — highest = newest, never reused; new = current max + 1) and a **`date`** (ISO), plus its text field + extras: key_learnings `{number, date, key, value}` · sessions `{number, date, summary, status, tags}` · todos `{number, date, task, priority, status}` · observations `{number, date, note, tags}`. **When adding:** stamp `number` + `date`, then **prepend** (newest on top). **Don't hand-trim** — rollover archives the oldest *by number* to @memory automatically. ### If Relevant - **.trinity/passport.json** — Evolve identity when the branch's role, capabilities, or principles have genuinely changed. Don't update just to update — but don't leave placeholders forever either. - **README.md** — Does it reflect current state? Update if stale. --- > Source: [AIOSAI/AIPass](https://github.com/AIOSAI/AIPass) — distributed by [TomeVault](https://tomevault.io).