JFR Analyzer

Plugin jfr-analyzer from marketplace btraceio-agent-plugins in btraceio/agent-plugins. Commands read from the repo's manifest — 8 days ago.

Skills (7)

• async-profiler-interop

  Use when async-profiler sampling should narrow a JVM performance hypothesis or be correlated with JFR history and a BTrace live probe.

• jfr-analyzer

  Systematic performance investigation of JFR, pprof, OTLP, and HPROF profiling data using USE and TSA methodologies. Entry point for the jfr-analyzer plugin.

• drilldown

  Phase 2 of jfr-analyzer. Reads focus.json, optionally gates HPROF analysis behind a cost warning, then dispatches parallel perf-engineer agents — one per selected problem area — each writing structured findings to drilldown/<area>.json.

• eval

  Eval subskill for jfr-analyzer. Routes regen|run|score|help. Manages corpus regeneration (MCP event extraction + oracle validation), eval runs, and scoring.

• report

  Phase 3 of jfr-analyzer. Reads all drilldown/<area>.json findings, deduplicates overlapping evidence, ranks by user-visible impact, produces plain-language finding cards, and writes report.json with a sphinx-optimize bridge stub.

• triage

  Phase 1 of jfr-analyzer. Opens a profiling file, runs USE+TSA+stackgraph+JVM/GC lanes automatically, presents ranked plain-language problem areas at a breakpoint, and writes focus.json for drilldown.

• jfr-btrace-interop

  Use when a JFR/profile finding should be confirmed with a live BTrace probe, or when BTrace output needs historical JFR context.

Subagents (1)

• perf-engineer

  Performance engineering expert. Analyzes JFR, pprof, OTLP, and HPROF profiling data using USE and TSA methodologies. Explains findings in plain language before presenting technical evidence. Usable standalone or as a spawned subagent.

MCP servers (1)

• jfr-mcp

  runs: jbang --java 26+ io.btrace:jfr-mcp:0.29.0 --stdio --attach

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