Cost Summary

A stable single-call interface that other plugins / scripts / dashboards can shell out to and parse. ADR-0002 considered exposing cost_report / cost_summary as proper MCP tools but deferred that — adding MCP tools requires modifying @claude-flow/cli source, out of scope for plugin-local work. This script is the equivalent: same data, exposed via a stdout JSON contract.

When to use

• Another plugin needs a snapshot of cost state — it shells out to summary.mjs --format json and parses.
• A dashboard / Slackbot fetches a one-line cost rollup.
• Quick "where am I right now?" view that pulls from every cost-tracker source (cost-tracking + federation-spend).

Output contract (JSON, stable)

{
  "exportedAt": "<ISO>",
  "total_cost_usd": 1546.36,
  "sessionCount": 1,
  "conversationCount": 1,
  "byTier": { "haiku": 0, "sonnet": 0, "opus": 1546.36, "unknown": 0 },
  "byModel": {
    "claude-opus-4-7": {
      "tier": "opus",
      "cost_usd": 1546.36,
      "messages": 1597,
      "input_tokens": 3090,
      "output_tokens": 3295940,
      "cache_creation_input_tokens": 10659599,
      "cache_read_input_tokens": 732833690
    }
  },
  "topSession": {
    "sessionId": "1dba3b8c-...",
    "total_cost_usd": 1546.36,
    "messageCount": 1597
  },
  "budget": {
    "budget_usd": 2500.00,
    "setAt": "<ISO>",
    "spent_usd": 1546.36,
    "utilization": 0.6185,
    "level": "INFO"
  },
  "federation": {
    "eventCount": 0,
    "peerCount": 0,
    "totalUsd24h": 0
  }
}

Steps

# Markdown (default)
node plugins/ruflo-cost-tracker/scripts/summary.mjs

# JSON for programmatic consumption
node plugins/ruflo-cost-tracker/scripts/summary.mjs --format json

Optional env: SUMMARY_NAMESPACE=cost-tracking, SUMMARY_FED_NAMESPACE=federation-spend, SUMMARY_FORMAT=json.

Cross-references

• cost-report — narrative report (per-agent / per-model lens; uses same data)
• cost-export — pushes to Prometheus / webhook (this skill is pull-style; export is push-style)
• ADR-0002 §"Decision" — explicitly defers proper MCP-tool registration to a future ADR