perf vs microscope
perf is a plugin bundle for AI coding tools published by agent-sh. Marketplaces we read that list it: 1 (Claude Code: claude-plugins-community). microscope is a plugin bundle for AI coding tools published by Petr Bouda. Marketplaces we read that list it: 1 (Community GitHub marketplaces). As of our marketplace pass on 2026-11-10. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  perf | |
|---|---|---|
| Claude Code: claude-plugins-community | Listed Version: 18416de Forks (GitHub): 0 (last published figure) Stars (GitHub): 3 (last published figure) Not marked · First seen |
Not listed |
| Community marketplace petrbouda/jeffrey | Not listed | Listed Version: 1.0.32 Forks (GitHub): 7 Stars (GitHub): 81 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | perf | microscope |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 3 (last published figure) | 81 |
| Forks (GitHub) (differs) | 0 (last published figure) | 7 |
| Last release (differs) | 2026-10-27 (worse) | 2026-11-06 (better) |
| Where it runs | Installs as a plugin bundle | Installs as a plugin bundle |
| Transport | Not stated | Not stated |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Hooks it runs (differs) | Not published | 1 |
| Parts of the bundle (differs) | Not published | 17 |
| Licence (differs) | MIT | Apache-2.0 |
| Repository (differs) | github.com/agent-sh/perf | github.com/petrbouda/jeffrey |
| Changes in the last 7 days (differs) | 0 | 5 |
| First seen (differs) | 2026-10-11 | 2026-11-01 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
perf
Structured performance investigation with baselines, profiling, and evidence-backed decisions — run by AI agents inside your editor. `/perf` enforces a rigorous 10-phase methodology derived from recorded real investigation sessions: establish a baseline, identify the breaking point, generate hypotheses, profile, run controlled experiments, measure, document. No random micro-optimizations; every change is baselined, isolated, measured, and either kept or reverted with evidence. Designed to keep the agent honest in a domain where intuition is usually wrong.
microscope
Analyze JVM recordings with a running Jeffrey Microscope — point it at a JFR file or heap dump to build a profile, then list analysed recordings, query their DuckDB tables, and pull flamegraph, trace and heap-dump exports without leaving the terminal.
How to run each
perf As a Claude Code plugin
/plugin marketplace add anthropics/claude-plugins-community
/plugin install perf@claude-communitymicroscope As a Claude Code plugin
/plugin marketplace add petrbouda/jeffrey
/plugin install microscope@jeffreyCommands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: perf · What it can do: microscope · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-community/blob/HEAD/.claude-plugin/marketplace.json. Data comes from public marketplace files in GitHub repositories of their authors. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.