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 },