Installs the sem skill into ~/.claude/skills/sem/ so the agent knows when and how to reach for sem (impact, context, orient, diff, blame, log) instead of grep for structural code questions.
Registers the sem MCP server (sem mcp) at user scope, so the sem_impact / sem_context / sem_entities / ... tools are available in every session.

Optional: a live sem badge in your statusline

npx @ataraxy-labs/sem-skill --badge

Adds a small badge to your Claude Code statusline that shows sem working in real time: how many structural queries this session, the last command and the entity it analyzed, its latency, a sparkline of recent latencies, and a rotating stat (distinct entities analyzed, top command) (⊕ sem ×12 impact validateToken 9ms ▁▂▃▅▂ · 7 entities analyzed). It picks up sem whether the agent uses the MCP tools or the sem CLI, and falls back to recent activity so it never gets stuck on "idle". It is opt-in and non-destructive: it backs up your settings, and if you already have a statusline it leaves it untouched and just tells you how to add the badge yourself. To remove it, delete the statusLine key and the mcp__sem__.* and Bash PostToolUse entries from ~/.claude/settings.json.

The --badge install also drops a live viewer at ~/.claude/sem-live.py. Run it in a spare terminal pane:

python3 ~/.claude/sem-live.py

It redraws an ASCII blast-radius graph every time sem runs (the analyzed entity, its direct callers, transitive count), plus a savings meter — a running, honestly-estimated tally of the grep+read round-trips, time, and tokens sem saved you this session, and a lifetime counter that grows across sessions. The estimates are anchored to a measured benchmark and labelled ≈.

It's idempotent, re-run it any time. It needs the sem CLI on PATH (npm i -g @ataraxy-labs/sem or see the install docs); if sem isn't installed yet, the skill and MCP registration still go in and work once it is.

Restart the agent session afterward to load the MCP tools.

Skill content originally contributed by @linhlban150612 (sem PR #376).