Trace

Traces how architectural decisions evolved across your codebase by searching CASS session transcripts, handoff docs, git history, and research artifacts in parallel. You give it a concept like "three-level architecture" or "agent team protocol" and it builds a chronological timeline showing what changed, when, and why, with source citations for every claim. Writes a markdown report to .agents/research/ with the full provenance chain. The workflow is notably prescriptive about execution, running four parallel search agents and deduplicating results before synthesis. Most useful when you inherit a system and need to understand the reasoning behind design choices, or when a decision's context has been lost to time. Handles missing tools gracefully and knows when to hand off to the separate provenance skill for artifact lineage instead of decision history.