Use this skill when the user wants to profile Ruby CPU usage — sample a running process, record stack traces, or generate flamegraphs without modifying the Ruby app.
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Added September 6, 2026
toolsgorubybashrailsgit
Works with
cli
Security analysis
C71/100
criticalPipes output to a shell interpreter
mediumUses curl or wget to download content
criticalDownloads and executes remote scripts — classic supply chain attack
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---
name: rbspy
description: Use this skill when the user wants to profile Ruby CPU usage — sample a running process, record stack traces, or generate flamegraphs without modifying the Ruby app.
---
# rbspy Plugin
Sampling CPU profiler for Ruby. Attaches to running Ruby processes (MRI, JRuby, TruffleRuby) and records stack samples with minimal overhead — ideal for production flamegraphs and call-graph analysis.
## Installation
```bash
curl -L https://raw.githubusercontent.com/rbspy/rbspy/main/install.sh | sh
# or
cargo install rbspy
```
## Basic Usage
```bash
# Profile a Ruby script by PID
rbspy record --pid 12345 --duration 30
# Profile a command directly
rbspy record -- ruby my_app.rb
# Live top-like view of hot methods
rbspy top --pid 12345
# Generate a flamegraph SVG
rbspy record --format flamegraph --output profile.svg -- ruby server.rb
```
## Common Patterns
```bash
# Sample for 60 seconds, write raw data
rbspy record --duration 60 --file profile.gz --pid $(pgrep -f puma)
# Subprocess profiling with rate control
rbspy record --rate 100 -- bundle exec rails server
# Show version and supported Ruby versions
rbspy --version
```
## Usage Examples
- "Profile my Rails server and find slow methods"
- "Generate a flamegraph for this Ruby worker"
- "See which methods use the most CPU in PID 9999"
## SuperCLI
```bash
sc rbspy _ _ record --pid 12345 --duration 30
sc rbspy _ _ top --pid 12345
sc plugins learn rbspy
```
