Enums
idavidov13/agentic-playwright
TypeScript enum conventions for the Playwright scaffold — PascalCase enum names, SCREAMINGSNAKECASE members, location rules for app-specific (enums/{area}/) vs shared/utility (enums/util/)…
Manage Chromium histograms and enums metadata. An agent skill from nwjs/chromium.src.
BSD-3-ClauseAuto-check passed
Install Histograms
$ npx skills add nwjs/chromium.src --skill histograms -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install nwjs/chromium.src histograms --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/nwjs/chromium.src.git skills-src && mkdir -p .claude/skills && cp -r skills-src/agents/skills/histograms .claude/skills/histograms && 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 "histograms" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/histograms into .claude/skills/histograms/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "histograms", 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/nwjs/chromium.src/tree/main/agents/skills/histogramsType 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 nwjs/chromium.src --skill histograms -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install nwjs/chromium.src histograms --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nwjs/chromium.src.git skills-src && mkdir -p .agents/skills && cp -r skills-src/agents/skills/histograms .agents/skills/histograms && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "histograms" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/histograms into .agents/skills/histograms/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "histograms", 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 nwjs/chromium.src --skill histograms -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install nwjs/chromium.src histograms --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nwjs/chromium.src.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/agents/skills/histograms .cursor/skills/histograms && 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 "histograms" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/histograms into .cursor/skills/histograms/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "histograms", 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/nwjs/chromium.src.git --path agents/skills/histograms--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 nwjs/chromium.src --skill histograms -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install nwjs/chromium.src histograms --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nwjs/chromium.src.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/agents/skills/histograms .gemini/skills/histograms && 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 "histograms" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/histograms into .gemini/skills/histograms/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "histograms", 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 nwjs/chromium.src histogramsInstalls 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 nwjs/chromium.src --skill histograms -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/nwjs/chromium.src.git skills-src && mkdir -p .github/skills && cp -r skills-src/agents/skills/histograms .github/skills/histograms && 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 "histograms" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/histograms into .github/skills/histograms/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "histograms", 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 nwjs/chromium.src --skill histograms -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install nwjs/chromium.src histograms --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nwjs/chromium.src.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/agents/skills/histograms .opencode/skills/histograms && 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 "histograms" agent skill from https://github.com/nwjs/chromium.src/tree/main/agents/skills/histograms into .opencode/skills/histograms/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "histograms", 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
histograms- GitHub stars
- 160
- Token cost
- ~483 tokens
- SKILL.md length
- 236 words
- Files
- 2
- Skills in repo
- 64
- Repo updated
- First seen
- Licence
- BSD-3-Clause
At a glance
Manage Chromium histograms and enums metadata. An agent skill from nwjs/chromium.src.
- Works in 2 steps: The user who requested the change… → A relevant team (if possible). If you're…
- Adding code that logs a histogram
- SKILL.md covers Overview, Guidelines and Workflow
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Histograms is an agent skill from nwjs/chromium.src. Manage Chromium histograms and enums metadata. Use this skill when adding code that logs a histogram or when updating metadata in histograms.xml or enums.xml.
Its SKILL.md is about 480 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `README.md`).
The repository describes itself as: Chromium codebase with NW.js modifications. Based on https://chromium.googlesource.com/chromium/src.git. The licence is BSD-3-Clause.
When your agent uses it
- Adding code that logs a histogram
- Updating metadata in histograms.xml
Example prompts
- “/histograms”
Workflow steps
2 steps, taken from the first numbered list in SKILL.md.
- The user who requested the change (usually the primary owner).
- A relevant team (if possible). If you're unsure who to list as the second
What it can do on your machine
Read from SKILL.md and the folder at commit a9e8946. 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
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
Histograms loads about 483 tokens when it runs. Until then it costs about 42 tokens; SKILL.md has 236 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 nwjs/chromium.src at commit a9e8946, republished under its BSD-3-Clause licence (© nwjs). 236 words, ~483 tokens.
Download SKILL.mdSave it as
.claude/skills/histograms/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- histograms
- description
- Manage Chromium histograms and enums metadata. Use this skill when adding code that logs a histogram or when updating metadata in histograms.xml or enums.xml.
Histograms
This skill provides guidance and workflows for logging histograms and managing their metadata in the Chromium codebase.
Overview
When adding code that logs a histogram, you must also add metadata about that histogram and any associated enums to ensure they are properly tracked and interpreted.
Guidelines
Metadata Files
- Histograms: Metadata goes in
histograms.xml. - Enums: Metadata about enums goes in
enums.xmlin the same directory as the correspondinghistograms.xml.
Directory Structure
Metadata files are located in subdirectories of
//tools/metrics/histograms/metadata/. The subdirectory name is based on the
first part of the histogram name (e.g., Platform.Foo would likely be in
metadata/platform/). If the correct subdirectory is unclear, ask the user.
Ownership
Histograms must have at least two owners:
- The user who requested the change (usually the primary owner).
- A relevant team (if possible). If you're unsure who to list as the second owner, ask the user.
Expiry Date
Set the expiry date to 3 months in the future from the date you add the histogram, unless a specific date is more appropriate.
Workflow
- Identify the Histogram: Determine the name of the histogram being logged or updated.
- Locate Metadata Directory: Find the appropriate subdirectory in
//tools/metrics/histograms/metadata/. - Update histograms.xml: Add or update the
<histogram>entry. - Update enums.xml (if applicable): If the histogram uses an enum, ensure
the corresponding
<enum>and its<int>values are defined inenums.xml. - Verify: Check
//tools/metrics/histograms/README.mdfor additional policies.
© nwjs, BSD-3-Clause. 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 in agents/skills/histograms of nwjs/chromium.src.
- SKILL.md
- README.md
Open the folder on GitHubat commit a9e8946
Compare with similar skills
Histograms 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 |
|---|---|---|---|---|---|---|
| Histograms this skillnwjs/chromium.src | 160 | — | ~483 | Automated safety check: Pass | BSD-3-Clause | |
| Enumsidavidov13/agentic-playwright | 225 | — | ~3k | Automated safety check: Pass | MIT | |
| Adinfo Enumwgpsec/AboutSecurity | 1.8k | — | ~383 | Automated safety check: Pass | None | |
| Create Enumshopsys/shopsys | 350 | — | ~1.9k | Automated safety check: Pass | Custom licence | |
| Unreal Enum and Struct Editorkevinpbuckley/VibeUE | 726 | — | ~2.3k | Automated safety check: Pass | MIT | |
| Bpx Enumwilddogjp/openbpx | 101 | — | ~268 | Automated safety check: Pass | Apache-2.0 |
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Questions about Histograms
What does Histograms do?
Manage Chromium histograms and enums metadata. An agent skill from nwjs/chromium.src. src. Manage Chromium histograms and enums metadata.
When should I use Histograms?
Histograms fits situations like: adding code that logs a histogram; updating metadata in histograms.xml.
How do I install Histograms in Claude Code?
Run `npx skills add nwjs/chromium.src --skill histograms -a claude-code`. Or copy the skill folder (agents/skills/histograms in nwjs/chromium.src) into .claude/skills/histograms in your project. Claude Code loads it when a task matches its description.
How do I install Histograms in Codex?
Run `npx skills add nwjs/chromium.src --skill histograms -a codex`. Or copy the skill folder (agents/skills/histograms in nwjs/chromium.src) into .agents/skills/histograms in your project. Codex loads it when a task matches its description.
Can I use Histograms 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 nwjs/chromium.src --skill histograms -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/histograms, .gemini/skills/histograms, .github/skills/histograms and .opencode/skills/histograms in your project.
What does Histograms need to run?
SKILL.md names no scripts, command-line tools or credentials: Histograms is instructions for the agent only.
Does Histograms 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 Histograms 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 Histograms use?
Histograms is published under the BSD-3-Clause licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Histograms use?
About 483 tokens (SKILL.md is roughly 1.9k 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 Histograms?
Skills that share tags, products or a category with Histograms: Enums (idavidov13/agentic-playwright, 225 stars), Adinfo Enum (wgpsec/AboutSecurity, 1.8k stars), Create Enum (shopsys/shopsys, 350 stars) and Unreal Enum and Struct Editor (kevinpbuckley/VibeUE, 726 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Histograms?
nwjs (a GitHub organization) maintains it in nwjs/chromium.src, which has 160 GitHub stars. The repository holds 64 skills in this directory. The repository was last updated on October 3, 2026.
Source: nwjs/chromium.src on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.