Samply
vortex-data/vortex
Analyze Samply Firefox-profiler output, record focused profiles, summarize hot threads/stacks, inspect symbolication, and compare profile evidence before and after a performance change.
Profile Rubydex indexer performance — CPU flamegraphs, memory usage, phase-level timing.
Install Profiling
$ npx skills add Shopify/rubydex --skill profiling -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Shopify/rubydex profiling --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/Shopify/rubydex.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/profiling .claude/skills/profiling && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "profiling" agent skill from https://github.com/Shopify/rubydex/tree/main/.claude/skills/profiling into .claude/skills/profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "profiling", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/Shopify/rubydex/tree/main/.claude/skills/profilingType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add Shopify/rubydex --skill profiling -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Shopify/rubydex profiling --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Shopify/rubydex.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/profiling .agents/skills/profiling && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "profiling" agent skill from https://github.com/Shopify/rubydex/tree/main/.claude/skills/profiling into .agents/skills/profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "profiling", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Shopify/rubydex --skill profiling -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Shopify/rubydex profiling --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Shopify/rubydex.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/profiling .cursor/skills/profiling && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "profiling" agent skill from https://github.com/Shopify/rubydex/tree/main/.claude/skills/profiling into .cursor/skills/profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "profiling", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/Shopify/rubydex.git --path .claude/skills/profiling--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add Shopify/rubydex --skill profiling -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Shopify/rubydex profiling --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Shopify/rubydex.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/profiling .gemini/skills/profiling && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "profiling" agent skill from https://github.com/Shopify/rubydex/tree/main/.claude/skills/profiling into .gemini/skills/profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "profiling", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install Shopify/rubydex profilingInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add Shopify/rubydex --skill profiling -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Shopify/rubydex.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/profiling .github/skills/profiling && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "profiling" agent skill from https://github.com/Shopify/rubydex/tree/main/.claude/skills/profiling into .github/skills/profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "profiling", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Shopify/rubydex --skill profiling -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Shopify/rubydex profiling --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Shopify/rubydex.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/profiling .opencode/skills/profiling && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "profiling" agent skill from https://github.com/Shopify/rubydex/tree/main/.claude/skills/profiling into .opencode/skills/profiling/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "profiling", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
profiling- GitHub stars
- 363
- Token cost
- ~2.3k tokens
- SKILL.md length
- 979 words
- Files
- 1
- Skills in repo
- 4
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Profile Rubydex indexer performance — CPU flamegraphs, memory usage, phase-level timing.
- Works in 6 steps: Call Tree tab — shows cumulative time… → Flame Graph tab — visual representation… → Timeline — shows activity over time.… → …
- The user mentions profiling
- SKILL.md covers Profiling tool: samply, Build profile, Running a profile and Reading the results, plus 4 more sections
- Calls cargo
What it does
Profiling is an agent skill from Shopify/rubydex, published by the product's own GitHub organization. Profile Rubydex indexer performance — CPU flamegraphs, memory usage, phase-level timing. Use this skill whenever the user mentions profiling, performance, flamegraphs, benchmarking, "why is X slow", bottlenecks, hot paths, memory usage, or wants to understand where time is spent during indexing/resolution. Also trigger when comparing performance before/after a change.
Its SKILL.md is about 2.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Performance optimization. It works with Rust. The repository describes itself as: A high-performance static analysis toolkit for Ruby.
When your agent uses it
- The user mentions profiling
- Wants to understand where time is spent during indexing/resolution
- Comparing performance before/after a change
Example prompts
- “why is X slow”
- “/profiling”
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Call Tree tab — shows cumulative time per function, sorted by total cost. Start here
- Flame Graph tab — visual representation where width = time. Look for wide bars — those
- Timeline — shows activity over time. Useful for spotting if one phase is unexpectedly
- Filtering — type a function name in the filter box to isolate it.
- Transform > Focus on subtree — right-click a function to see only its callees. Perfect
- Transform > Merge function — collapse recursive calls to see aggregate cost.
What it can do on your machine
Read from SKILL.md and the folder at commit d8ff475. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
cargo
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Profiling loads about 2.3k tokens when it runs. Until then it costs about 95 tokens; SKILL.md has 979 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NoteRuns commands with sudoSKILL.md:243
sudo samply record rust/target/profiling/rubydex_cli <TARGET_PATH> --stats
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 979 words (~2,314 tokens).
“This skill helps you profile the Rubydex indexer to find CPU and memory bottlenecks. The indexer has a multi-phase pipeline (listing → indexing → resolution → querying). Use --stats to see which phase dominates, then profile to find what's expensive…”
- name
- profiling
Files
Just SKILL.md in .claude/skills/profiling of Shopify/rubydex.
Open the folder on GitHubat commit d8ff475
Compare with similar skills
Profiling next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Profiling this skillShopify/rubydex | 363 | — | ~2.3k | Automated safety check: Notes | Custom licence | |
| Samplyvortex-data/vortex | 3.2k | — | ~2.7k | Automated safety check: Pass | Apache-2.0 | |
| Investigate User Bugcristicretu/diri | 424 | — | ~1.2k | Automated safety check: Pass | Apache-2.0 | |
| Cppcrazyguitar/cppcheatsheet | 290 | — | ~1.8k | Automated safety check: Pass | MIT | |
| Rust Profilingdiodeme/Gold-Band | 143 | 1 repos | ~1.7k | Automated safety check: Notes | AGPL-3.0 | |
| Oxc Lint Rule Performance Reviewoxc-project/oxc | 23k | — | ~1.1k | Automated safety check: Pass | MIT |
Similar skills
Investigate User Bug
cristicretu/diri
Investigate a bug a specific diri user hit (crash, hang, slowness, memory leak, blank or garbled terminal, spawn/resume/remote failure, copy/paste not working) from diri's telemetry with the…
Cpp
crazyguitar/cppcheatsheet
Comprehensive C/C++ programming reference covering everything from C11-C23 and C++11-C++23, system programming, CUDA GPU computing, debugging tools, Rust interop, and advanced topics.
Rust Profiling
diodeme/Gold-Band
Rust profiling skill for performance analysis. An agent skill from diodeme/Gold-Band.
Oxc Lint Rule Performance Review
oxc-project/oxc
Review guidance for the speed of Oxc linter rules written in Rust: narrow node-kind checks, cheap tests first, deferred diagnostics and the smallest possible iteration.
Profiling Wado Compiler
wado-lang/wado
Profile the native Rust wado binary (compile/serve/run) for host-side bottlenecks — CPU with a sampling profiler, memory with the span trace's RSS and valgrind DHAT.
More from Shopify/rubydex
- Official
Rubydex MCP Benchmark
Shopify/rubydex
A skill your agent uses when benchmarking rubydex MCP against plain Grep/Glob for Ruby code tasks.
- Official
Send Private Method
Shopify/rubydex
Remediate a send/send call that reaches a private method, restoring a real public seam instead of bypassing visibility.
- Official
Benchmark Rbs
Shopify/rubydex
Benchmark Rubydex indexing performance on RBS core/stdlib, comparing the current branch against main.
Related
Works with
Categories
Questions about Profiling
What does Profiling do?
Profile Rubydex indexer performance — CPU flamegraphs, memory usage, phase-level timing. Profiling is an agent skill from Shopify/rubydex, published by the product's own GitHub organization. Profile Rubydex indexer performance — CPU flamegraphs, memory usage, phase-level timing.
When should I use Profiling?
Profiling fits situations like: the user mentions profiling; wants to understand where time is spent during indexing/resolution; comparing performance before/after a change.
How do I install Profiling in Claude Code?
Run `npx skills add Shopify/rubydex --skill profiling -a claude-code`. Or copy the skill folder (.claude/skills/profiling in Shopify/rubydex) into .claude/skills/profiling in your project. Claude Code loads it when a task matches its description.
How do I install Profiling in Codex?
Run `npx skills add Shopify/rubydex --skill profiling -a codex`. Or copy the skill folder (.claude/skills/profiling in Shopify/rubydex) into .agents/skills/profiling in your project. Codex loads it when a task matches its description.
Can I use Profiling in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Shopify/rubydex --skill profiling -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/profiling, .gemini/skills/profiling, .github/skills/profiling and .opencode/skills/profiling in your project.
What does Profiling need to run?
Going by SKILL.md and its folder, Profiling needs the command-line tools its instructions call (cargo).
Does Profiling access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Profiling safe to install?
Our automated static check of SKILL.md found notes only (runs commands with sudo), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.
What licence does Profiling use?
Profiling has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Profiling use?
About 2.3k tokens (SKILL.md is roughly 9.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Profiling?
Skills that share tags, products or a category with Profiling: Samply (vortex-data/vortex, 3.2k stars), Investigate User Bug (cristicretu/diri, 424 stars), Cpp (crazyguitar/cppcheatsheet, 290 stars) and Rust Profiling (diodeme/Gold-Band, 143 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Profiling?
Shopify (a GitHub organization, an official publisher) maintains it in Shopify/rubydex, which has 363 GitHub stars. The repository holds 4 skills in this directory. The repository was last updated on October 1, 2026.
Source: Shopify/rubydex on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.