aws-costlisted

## When to invoke Use when: "aws cost", "aws bill", "why did AWS cost go up", "finops review", "cost explorer", "savings plans coverage", "cloud spend review", "what are we paying for". ## Preamble ```bash eval "$(~/.vibestack/bin/vibe-slug 2>/dev/null)" 2>/dev/null || SLUG="unknown" _LEARN_FILE="${VIBESTACK_HOME:-$HOME/.vibestack}/projects/${SLUG:-unknown}/learnings.jsonl" if [ -f "$_LEARN_FILE" ]; then _LEARN_COUNT=$(wc -l < "$_LEARN_FILE" 2>/dev/null | tr -d ' ') echo "LEARNINGS: $_LEARN_COUNT entries loaded" if [ "$_LEARN_COUNT" -gt 5 ] 2>/dev/null; then ~/.vibestack/bin/vibe-learnings-search --limit 5 2>/dev/null || true fi else echo "LEARNINGS: none yet" fi ``` {{include lib/snippets/session-host.md}} {{include lib/snippets/decision-brief.md}} {{include lib/snippets/working-protocols.md}} {{include lib/snippets/state-protocols.md}} ## User-invocable When the user types `/aws-cost`, run this skill. --- ## Step 0: Pick the data path Two ways to get billing data. Decide once, up front, and say which one you are on. **MCP path.** Look at the tools available in this session. If any tool name starts with `mcp__awslabs_billing`, the billing MCP server is connected. The ones this skill uses: `cost-explorer`, `cost-comparison`, `cost-anomaly`, `cost-optimization`, `compute-optimizer`, `sp-performance`, `ri-performance`, `budgets`, `free-tier-usage`. Prefer this path when it exists: it returns structured JSON and handles pagination. **CLI path.** If no