Run project tests and return structured health — per-file pass/fail counts, coverage %, failures with Expected/Received, broken_areas (grouped by module), fix_first bullets, failure_clusters (same-root-cause grouping), coverage_by_area (per-module lcov rollup), blind_spots (flaky/patch/missing-test warnings), triage bundle, area_graph, graph_mermaid, health. task:why for follow-ups. Cheaper than parsing 600-line test logs — run once, query slices from session cache. Call when: after code changes; user asks if tests pass; before push; need per-file test status or failure details without re-running. Use after edits: pass diff_base: main to see if your changes broke tests. Scope to module with area: proxy, auth, handlers. DO NOT call when: package CVE check (check_package); prove deploy claim (project_memory); repo orientation (get_project_context); find symbol (find_code). Workflow: task=run once → task=list|failures|status|why on same session_id (<100ms). task=detect for framework/command only. task=history|compare for cloud scan rows (hosted). Hosted MCP: 1 credit per task:run; session queries, why, and compare are free. path: absolute directory (stdio MCP) or github:owner/repo / GitHub URL (hosted MCP).