Agent skill

Timeline Builder

Generate beautiful interactive timeline HTML pages from JSON data, with vertical, horizontal, or dual-side layouts, collapsible details, and custom colors.

MITAuto-check passedProduct & Project Management

Install Timeline Builder

skills CLI

$ npx skills add zebbern/claude-code-guide --skill timeline-builder -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install zebbern/claude-code-guide timeline-builder --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/zebbern/claude-code-guide.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/timeline-builder .claude/skills/timeline-builder && rm -rf skills-src

Use ~/.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/

Paste into Claude Code

Install the "timeline-builder" agent skill from https://github.com/zebbern/claude-code-guide/tree/main/skills/timeline-builder into .claude/skills/timeline-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "timeline-builder", 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

$skill-installer install https://github.com/zebbern/claude-code-guide/tree/main/skills/timeline-builder

Type 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.

skills CLI

$ npx skills add zebbern/claude-code-guide --skill timeline-builder -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install zebbern/claude-code-guide timeline-builder --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/zebbern/claude-code-guide.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/timeline-builder .agents/skills/timeline-builder && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "timeline-builder" agent skill from https://github.com/zebbern/claude-code-guide/tree/main/skills/timeline-builder into .agents/skills/timeline-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "timeline-builder", 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.

skills CLI

$ npx skills add zebbern/claude-code-guide --skill timeline-builder -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install zebbern/claude-code-guide timeline-builder --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/zebbern/claude-code-guide.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/timeline-builder .cursor/skills/timeline-builder && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "timeline-builder" agent skill from https://github.com/zebbern/claude-code-guide/tree/main/skills/timeline-builder into .cursor/skills/timeline-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "timeline-builder", 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

$ gemini skills install https://github.com/zebbern/claude-code-guide.git --path skills/timeline-builder

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add zebbern/claude-code-guide --skill timeline-builder -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install zebbern/claude-code-guide timeline-builder --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/zebbern/claude-code-guide.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/timeline-builder .gemini/skills/timeline-builder && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "timeline-builder" agent skill from https://github.com/zebbern/claude-code-guide/tree/main/skills/timeline-builder into .gemini/skills/timeline-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "timeline-builder", 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.

GitHub CLI

$ gh skill install zebbern/claude-code-guide timeline-builder

Installs 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).

skills CLI

$ npx skills add zebbern/claude-code-guide --skill timeline-builder -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/zebbern/claude-code-guide.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/timeline-builder .github/skills/timeline-builder && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "timeline-builder" agent skill from https://github.com/zebbern/claude-code-guide/tree/main/skills/timeline-builder into .github/skills/timeline-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "timeline-builder", 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.

skills CLI

$ npx skills add zebbern/claude-code-guide --skill timeline-builder -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install zebbern/claude-code-guide timeline-builder --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/zebbern/claude-code-guide.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/timeline-builder .opencode/skills/timeline-builder && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "timeline-builder" agent skill from https://github.com/zebbern/claude-code-guide/tree/main/skills/timeline-builder into .opencode/skills/timeline-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "timeline-builder", 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: timeline-builder
GitHub stars: 4.6k
Token cost: ~915 tokens
SKILL.md length: 270 words
Files: 3 (incl. scripts)
Skills in repo: 46
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Generate beautiful interactive timeline HTML pages from JSON data, with vertical, horizontal, or dual-side layouts, collapsible details, and custom colors.

Works in 3 steps: Vertical layout (vertical) — A classic… → Horizontal layout (horizontal) — A… → Dual-side layout (dual-side) — Events…
Tasks that involve Project management
SKILL.md covers Usage, Use Cases and Dependencies
Runs Python scripts from its folder; calls python3

What it does

Timeline Builder is an agent skill from zebbern/claude-code-guide. Generate beautiful interactive timeline HTML pages from JSON data, with vertical, horizontal, or dual-side layouts, collapsible details, and custom colors. Ideal for project milestones, company histories, or resumes. Triggered when a user mentions 'timeline', 'history of events', 'project milestones', 'release log', or asks to visualize a chronological sequence of data.

Its SKILL.md is about 920 tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including scripts (for example `scripts/generate_timeline.py`).

It sits in Product & Project Management, covering Project management and HTML artifacts. The repository describes itself as: Claude Code Guide - Setup, Commands, workflows, agents, skills & tips-n-tricks from beginner to power user! The licence is MIT.

When your agent uses it

Tasks that involve Project management
Tasks that involve HTML artifacts

Example prompts

“timeline”
“history of events”
“project milestones”
“/timeline-builder”

Requirements

Python 3

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

Vertical layout (vertical) — A classic top-to-bottom timeline with event cards alternating on either side of the axis
Horizontal layout (horizontal) — A horizontally scrollable timeline, best for displaying fewer events
Dual-side layout (dual-side) — Events are placed on the left or right based on the side field, great for side-by-side comparisons

What it can do on your machine

Read from SKILL.md and the folder at commit 4698e3b. 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
Ships 1 file in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
- python3
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

Timeline Builder loads about 915 tokens when it runs. Until then it costs about 97 tokens; SKILL.md has 270 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~97
When it runs · the whole SKILL.md, loaded when a task matches: ~915

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); the scripts in this folder are not scanned.

SKILL.md

The full file from zebbern/claude-code-guide at commit 4698e3b, republished under its MIT licence (© zebbern). 270 words, ~915 tokens.

Download SKILL.mdSave it as .claude/skills/timeline-builder/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.

name: timeline-builder
description: Generate beautiful interactive timeline HTML pages from JSON data, with vertical, horizontal, or dual-side layouts, collapsible details, and custom colors. Ideal for project milestones, company histories, or resumes. Triggered when a user mentions 'timeline', 'history of events', 'project milestones', 'release log', or asks to visualize a chronological sequence of data.
license: MIT
type: tool
tags: timeline, html, visualization, interactive, responsive

Timeline Builder

Generate beautiful interactive timeline HTML pages from JSON configuration data, with three layout modes:

Vertical layout (vertical) — A classic top-to-bottom timeline with event cards alternating on either side of the axis
Horizontal layout (horizontal) — A horizontally scrollable timeline, best for displaying fewer events
Dual-side layout (dual-side) — Events are placed on the left or right based on the side field, great for side-by-side comparisons

All layouts support:

Click to expand/collapse event details
Mobile-friendly responsive design
Custom theme colors, icons, and category labels
Pure static HTML with zero dependencies — opens directly in any browser

Usage

Basic: Generate from a JSON config file

bash

python3 scripts/generate_timeline.py --config timeline_data.json --output timeline.html

Read JSON from stdin

bash

cat timeline_data.json | python3 scripts/generate_timeline.py --stdin --output timeline.html

Override layout mode (takes precedence over config file)

bash

python3 scripts/generate_timeline.py --config data.json --layout horizontal --output timeline.html

JSON Configuration Format

json

{
  "title": "Project Milestones",
  "layout": "vertical",
  "theme": {
    "primaryColor": "#2563eb",
    "secondaryColor": "#7c3aed",
    "backgroundColor": "#ffffff",
    "textColor": "#1f2937",
    "lineColor": "#d1d5db",
    "fontFamily": "system-ui, -apple-system, sans-serif"
  },
  "events": [
    {
      "date": "2024-01-15",
      "title": "Project Kickoff",
      "summary": "Approval completed, core team assembled",
      "details": "Detailed description text, shown when the card is expanded...",
      "icon": "🚀",
      "category": "Milestone",
      "color": "#10b981",
      "side": "left"
    }
  ]
}

CLI Arguments

Argument	Description
`--config, -c`	Path to the JSON config file (mutually exclusive with `--stdin`)
`--stdin`	Read JSON from standard input
`--output, -o`	Output HTML file path (defaults to stdout)
`--layout, -l`	Override layout mode: `vertical`, `horizontal`, `dual-side`
`--title, -t`	Override the timeline title

Event Fields

Field	Required	Description
`date`	Yes	Date label — any format works (e.g. `2024-01`, `Q1 2024`, `Phase One`)
`title`	Yes	Event title
`summary`	No	Short description, always visible on the card
`details`	No	Detailed content, revealed on click
`icon`	No	Emoji or single-character icon (defaults to `●`)
`category`	No	Category tag displayed on the card
`color`	No	Event node color (overrides the theme color)
`side`	No	Only for dual-side layout: `left` or `right`

Use Cases

Project milestone displays
Product release histories
Company growth timelines
Personal resume timelines
Course syllabus outlines
Any scenario requiring chronological information display

Dependencies

Python 3.6+ (standard library only — no extra packages required)

Files

SKILL.md and 2 other files (scripts) in skills/timeline-builder of zebbern/claude-code-guide.

SKILL.md
LICENSE
scripts/generate_timeline.py

Open the folder on GitHubat commit 4698e3b

Compare with similar skills

Timeline Builder 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.

Timeline Builder compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Timeline Builder this skillzebbern/claude-code-guide	4.6k	—	~915	Automated safety check: Pass	MIT	yesterday
Project Status Artifactanthropics/claude-plugins-official	37k	—	~5.1k	Automated safety check: Pass	Apache-2.0	yesterday
Ichartjswanghetommy/ichartjs	352	—	~3.4k	Automated safety check: Pass	Apache-2.0	yesterday
Harness Plan BriefChachamaru127/claude-code-harness	3.2k	—	~2.2k	Automated safety check: Notes	MIT	2 days ago
CCPM Project Managementautomazeio/ccpm	8.4k	—	~1.1k	Automated safety check: Pass	MIT	6 mo ago
Uvastral-sh/claude-code-plugins	314	2 repos	~980	Automated safety check: Pass	Apache-2.0	7 mo ago

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Questions about Timeline Builder

What does Timeline Builder do?

Generate beautiful interactive timeline HTML pages from JSON data, with vertical, horizontal, or dual-side layouts, collapsible details, and custom colors. Timeline Builder is an agent skill from zebbern/claude-code-guide. Generate beautiful interactive timeline HTML pages from JSON data, with vertical, horizontal, or dual-side layouts, collapsible details, and custom colors.

When should I use Timeline Builder?

Timeline Builder fits situations like: tasks that involve Project management; tasks that involve HTML artifacts.

How do I install Timeline Builder in Claude Code?

Run `npx skills add zebbern/claude-code-guide --skill timeline-builder -a claude-code`. Or copy the skill folder (skills/timeline-builder in zebbern/claude-code-guide) into .claude/skills/timeline-builder in your project. Claude Code loads it when a task matches its description.

How do I install Timeline Builder in Codex?

Run `npx skills add zebbern/claude-code-guide --skill timeline-builder -a codex`. Or copy the skill folder (skills/timeline-builder in zebbern/claude-code-guide) into .agents/skills/timeline-builder in your project. Codex loads it when a task matches its description.

Can I use Timeline Builder 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 zebbern/claude-code-guide --skill timeline-builder -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/timeline-builder, .gemini/skills/timeline-builder, .github/skills/timeline-builder and .opencode/skills/timeline-builder in your project.

What does Timeline Builder need to run?

Going by SKILL.md and its folder, Timeline Builder needs Python for the scripts in its folder and the command-line tools its instructions call (python3). Our summary lists: Python 3.

Does Timeline Builder 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 Timeline Builder 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Timeline Builder use?

Timeline Builder is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Timeline Builder use?

About 915 tokens (SKILL.md is roughly 3.7k 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 Timeline Builder?

Skills that share tags, products or a category with Timeline Builder: Project Status Artifact (anthropics/claude-plugins-official, 37k stars), Ichartjs (wanghetommy/ichartjs, 352 stars), Harness Plan Brief (Chachamaru127/claude-code-harness, 3.2k stars) and CCPM Project Management (automazeio/ccpm, 8.4k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Timeline Builder?

zebbern (a GitHub user) maintains it in zebbern/claude-code-guide, which has 4,648 GitHub stars. The repository holds 46 skills in this directory. The repository was last updated on October 7, 2026.

Source: zebbern/claude-code-guide on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Timeline Builder

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Timeline Builder

Usage

Basic: Generate from a JSON config file

Read JSON from stdin

Override layout mode (takes precedence over config file)

JSON Configuration Format

CLI Arguments

Event Fields

Use Cases

Dependencies

Files

Compare with similar skills

Similar skills

More from zebbern/claude-code-guide

Related

Questions about Timeline Builder