Electron DevTools Trace Analysis
keybase/client
Analyzes Chrome or Electron DevTools Performance trace exports with Python scripts to find where render time actually goes, without opening DevTools.
A skill your agent uses when auditing slow page loads, heavy assets, or rendering delays related to Provide source maps for production debugging.
Install Source Maps
$ npx skills add thedaviddias/Front-End-Checklist --skill source-maps -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist source-maps --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/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/source-maps .claude/skills/source-maps && 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 "source-maps" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/source-maps into .claude/skills/source-maps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "source-maps", 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/thedaviddias/Front-End-Checklist/tree/main/skills/source-mapsType 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 thedaviddias/Front-End-Checklist --skill source-maps -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist source-maps --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/source-maps .agents/skills/source-maps && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "source-maps" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/source-maps into .agents/skills/source-maps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "source-maps", 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 thedaviddias/Front-End-Checklist --skill source-maps -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist source-maps --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/source-maps .cursor/skills/source-maps && 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 "source-maps" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/source-maps into .cursor/skills/source-maps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "source-maps", 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/thedaviddias/Front-End-Checklist.git --path skills/source-maps--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 thedaviddias/Front-End-Checklist --skill source-maps -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist source-maps --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/source-maps .gemini/skills/source-maps && 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 "source-maps" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/source-maps into .gemini/skills/source-maps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "source-maps", 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 thedaviddias/Front-End-Checklist source-mapsInstalls 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 thedaviddias/Front-End-Checklist --skill source-maps -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/source-maps .github/skills/source-maps && 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 "source-maps" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/source-maps into .github/skills/source-maps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "source-maps", 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 thedaviddias/Front-End-Checklist --skill source-maps -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install thedaviddias/Front-End-Checklist source-maps --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/source-maps .opencode/skills/source-maps && 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 "source-maps" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/source-maps into .opencode/skills/source-maps/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "source-maps", 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
source-maps- GitHub stars
- 74k
- Token cost
- ~445 tokens
- SKILL.md length
- 176 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when auditing slow page loads, heavy assets, or rendering delays related to Provide source maps for production debugging.
- Auditing slow page loads
- SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Rendering delays related to Provide source maps for production debugging
What it does
Source Maps is an agent skill from thedaviddias/Front-End-Checklist. Use when auditing slow page loads, heavy assets, or rendering delays related to Provide source maps for production debugging. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
Its SKILL.md is about 450 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).
It sits in Development, covering Web performance and Debugging. The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.
When your agent uses it
- Auditing slow page loads
- Rendering delays related to Provide source maps for production debugging
Example prompts
- “/source-maps”
What it can do on your machine
Read from SKILL.md and the folder at commit e8d14d0. 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
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
frontendchecklist.io
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
Source Maps loads about 445 tokens when it runs, and up to ~1.3k if it reads all its reference files. Until then it costs about 59 tokens; SKILL.md has 176 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 passed
The automated check found no risky patterns in SKILL.md.
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
The full file from thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 176 words, ~445 tokens.
Download SKILL.mdSave it as
.claude/skills/source-maps/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- source-maps
- description
- Use when auditing slow page loads, heavy assets, or rendering delays related to Provide source maps for production debugging. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
- metadata.category
- performance
- metadata.priority
- medium
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 10
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/performance/source-maps
Provide source maps for production debugging
Source maps are essential for debugging production issues effectively without compromising the performance benefits of minification.
Quick Reference
- Generate source maps to map minified code back to original source
- Upload source maps to error tracking services (e.g., Sentry) instead of serving them publicly
- Ensure source maps are correctly linked in your build process
Check
Verify if the project's build process generates source maps and if they are being correctly handled for production debugging.
Fix
Update the build configuration to generate source maps and integrate with an error tracking service for secure production debugging.
Explain
Explain how source maps enable developers to debug original source code when only minified code is running in the browser.
Code Review
Review the routes, assets, and loading behavior that affect Provide source maps for production debugging. Flag exact files, requests, or rendering steps that add unnecessary network, CPU, or layout cost, and describe the measurement method used to confirm the issue.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/performance/source-maps
© thedaviddias, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file (references) in skills/source-maps of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Source Maps 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 |
|---|---|---|---|---|---|---|
| Source Maps this skillthedaviddias/Front-End-Checklist | 74k | — | ~445 | Automated safety check: Pass | MIT | |
| Electron DevTools Trace Analysiskeybase/client | 9.3k | — | ~809 | Automated safety check: Pass | BSD-3-Clause | |
| Renderdoc GPU Debugrudybear/renderdoc-skill | 211 | — | ~4k | Automated safety check: Pass | MIT | |
| Runtime DebugOpenHikmah/openhikmah-web | 181 | — | ~618 | Automated safety check: Pass | GPL-3.0 | |
| Cx Telemetry Queryingcoralogix/cx-cli | 121 | — | ~2.6k | Automated safety check: Pass | Apache-2.0 | |
| Trellis Session Insightmindfold-ai/Trellis | 15k | 4 repos | ~1.7k | Automated safety check: Pass | AGPL-3.0 |
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Debug and verification workflow for runtime-bundle and module-resolution regressions.
Cx Telemetry Querying
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A skill your agent uses for any question involving telemetry data: "investigate an issue", "debug a problem", "find out why something is slow", "check error rates", "analyze user behavior"…
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Reach into past AI conversation history through the trellis mem CLI.
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A skill your agent uses when implementing or debugging ANY network request, API call, or data fetching.
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Related
Categories
Questions about Source Maps
What does Source Maps do?
A skill your agent uses when auditing slow page loads, heavy assets, or rendering delays related to Provide source maps for production debugging. Source Maps is an agent skill from thedaviddias/Front-End-Checklist. Use when auditing slow page loads, heavy assets, or rendering delays related to Provide source maps for production debugging.
When should I use Source Maps?
Source Maps fits situations like: auditing slow page loads; rendering delays related to Provide source maps for production debugging.
How do I install Source Maps in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill source-maps -a claude-code`. Or copy the skill folder (skills/source-maps in thedaviddias/Front-End-Checklist) into .claude/skills/source-maps in your project. Claude Code loads it when a task matches its description.
How do I install Source Maps in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill source-maps -a codex`. Or copy the skill folder (skills/source-maps in thedaviddias/Front-End-Checklist) into .agents/skills/source-maps in your project. Codex loads it when a task matches its description.
Can I use Source Maps 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 thedaviddias/Front-End-Checklist --skill source-maps -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/source-maps, .gemini/skills/source-maps, .github/skills/source-maps and .opencode/skills/source-maps in your project.
What does Source Maps need to run?
SKILL.md names no scripts, command-line tools or credentials: Source Maps is instructions for the agent only.
Does Source Maps access the network?
SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.
Is Source Maps safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Source Maps use?
Source Maps is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Source Maps use?
About 445 tokens (SKILL.md is roughly 1.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 852 tokens, read only when the agent opens those files.
What are the alternatives to Source Maps?
Skills that share tags, products or a category with Source Maps: Electron DevTools Trace Analysis (keybase/client, 9.3k stars), Renderdoc GPU Debug (rudybear/renderdoc-skill, 211 stars), Runtime Debug (OpenHikmah/openhikmah-web, 181 stars) and Cx Telemetry Querying (coralogix/cx-cli, 121 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Source Maps?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,388 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.
Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.