worklog

A work journal is the chronological, cross-linked record of what was done in a project, why, and how. It is committed to the repo, so it travels with the code and is the fastest on-ramp for a future session (human or AI) to understand how the project reached its current state — especially the "why is the code like this?" questions that source code alone never answers.

This skill is global and repo-agnostic: it works in any project. The journal lives at docs/worklog/ in the current repo (one file per day + an INDEX.md map).

When to write an entry

At the end of each substantive response — after finishing a chunk of work (a fix, a feature step, a decision, a research finding). Trivial/conversational turns don't need one. If the user gives you a new task after you responded, that task gets its own entry when done. One entry per logical unit of work; several per day is normal.

How to add an entry

Run the bundled script (installed with this skill). The markdown body is read from stdin:

"$HOME/.claude/skills/worklog/scripts/worklog.sh" add \
    --title "Short, specific title" \
    --type feature|fix|refactor|docs|decision|chore|infra|design|research|note \
    --status done|partial|blocked|wip \
    [--tags "comma,separated"] <<'EOF'
### What
What was done, concretely.

### Why
The motivation / context / problem that prompted it. (The most valuable part for future
understanding — without the "why", a record loses its value as circumstances change.)

### How
The approach and key technical choices. Mention the main files/functions.

### Outcome
Status + how it was verified (build/tests/manual), or what's still open.

### Decisions & trade-offs   (include when a real choice was made)
What was chosen, what was rejected, and why.

### Lessons / gotchas        (include when something was non-obvious or a correction)
Anything a future session should know so it doesn't relearn the hard way. This is the
compounding payoff: the journal gets smarter every time a mistake is corrected.

### Follow-ups               (include when there is unfinished/next work)
- [ ] …

### Links                    (include when related work exists)
[[WL-YYYY-MM-DD-NNN]] other entries · commit:<sha> · file paths
EOF

The script stamps the timestamp + a stable id (WL-YYYY-MM-DD-NNN), appends to today's file, updates docs/worklog/INDEX.md, and prints the id. What / Why / How / Outcome are required; the rest are included when relevant.

The target directory is the current repo's docs/worklog/ (resolved from $CLAUDE_PROJECT_DIR, else the git root, else the cwd). Override with WORKLOG_DIR for a non-repo or custom location.

Linking

• Another entry: [[WL-2026-06-03-002]] (just the id).
• A commit: commit:<sha>.
• Code: a normal path like src/server/auth.ts.

If the project also uses a separate memory or knowledge system, link to it too (e.g. mem:<name> for a file-memory note, claude-mem:<id> for a claude-mem observation).

Reading the journal (getting up to speed)

Start at docs/worklog/INDEX.md (one line per entry, grouped by day). Open the day files that look relevant; grep the entry id inside a day file for the full entry. For "why is the code like this?" the worklog usually answers faster than reading source.

Where this fits (optional, if the project uses them)

The worklog is the agent-authored, curated narrative layer — Claude writes each entry automatically at the end of a response (it is not maintained by hand). It pairs well with, but does not require, other knowledge layers:

• Auto-captured session memory (e.g. claude-mem) — the automatic wide net; worklog is the curated highlights of the same history.
• Distilled fact memory (e.g. per-project memory files) — atomic durable facts.
• Code-structure graphs (e.g. graphify) — where/what the code is.

Run the project's recall step (if any) at task start; write a worklog entry at task end.

Don'ts

• Don't hand-edit INDEX.md ids/timestamps — let the script manage them.
• Don't paste large diffs or secrets into an entry; summarize and link the commit.
• Don't skip the entry on real work because "it's small" — the value compounds.