Once gl-recon has flagged a reconciliation break, this skill walks the audit trail on both sides to figure out what actually happened. It pulls the GL journal entry through the internal-gl MCP, grabs the matching subledger transaction, then diffs the attributes: posting dates, FX rates, account mappings, sign conventions. It writes a single sentence root cause like "GL posted on settle date while subledger posted on trade date" and assigns an owner and action. The skill diagnoses only, it doesn't post corrections. Useful when you need to turn a bucket of unexplained breaks into a list of specific things someone can actually fix or monitor.
npx skills add https://github.com/anthropics/financial-services-plugins --skill break-trace