Agent skill

Cecil

Build and configure Cecil static sites, with focused guidance for content, templates, and site generation.

EUPL-1.2Auto-check passedFrontend & Design

Install Cecil

skills CLI

$ npx skills add Cecilapp/Cecil --skill cecil -a claude-code

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

GitHub CLI

$ gh skill install Cecilapp/Cecil cecil --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/Cecilapp/Cecil.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/cecil .claude/skills/cecil && 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 "cecil" agent skill from https://github.com/Cecilapp/Cecil/tree/main/skills/cecil into .claude/skills/cecil/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cecil", 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/Cecilapp/Cecil/tree/main/skills/cecil

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 Cecilapp/Cecil --skill cecil -a codex

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

GitHub CLI

$ gh skill install Cecilapp/Cecil cecil --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/Cecilapp/Cecil.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/cecil .agents/skills/cecil && 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 "cecil" agent skill from https://github.com/Cecilapp/Cecil/tree/main/skills/cecil into .agents/skills/cecil/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cecil", 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 Cecilapp/Cecil --skill cecil -a cursor

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

GitHub CLI

$ gh skill install Cecilapp/Cecil cecil --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/Cecilapp/Cecil.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/cecil .cursor/skills/cecil && 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 "cecil" agent skill from https://github.com/Cecilapp/Cecil/tree/main/skills/cecil into .cursor/skills/cecil/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cecil", 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/Cecilapp/Cecil.git --path skills/cecil

--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 Cecilapp/Cecil --skill cecil -a gemini-cli

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

GitHub CLI

$ gh skill install Cecilapp/Cecil cecil --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/Cecilapp/Cecil.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/cecil .gemini/skills/cecil && 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 "cecil" agent skill from https://github.com/Cecilapp/Cecil/tree/main/skills/cecil into .gemini/skills/cecil/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cecil", 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 Cecilapp/Cecil cecil

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 Cecilapp/Cecil --skill cecil -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/Cecilapp/Cecil.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/cecil .github/skills/cecil && 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 "cecil" agent skill from https://github.com/Cecilapp/Cecil/tree/main/skills/cecil into .github/skills/cecil/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cecil", 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 Cecilapp/Cecil --skill cecil -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 Cecilapp/Cecil cecil --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/Cecilapp/Cecil.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/cecil .opencode/skills/cecil && 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 "cecil" agent skill from https://github.com/Cecilapp/Cecil/tree/main/skills/cecil into .opencode/skills/cecil/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cecil", 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: cecil
GitHub stars: 297
Token cost: ~5.7k tokens
SKILL.md length: 1,884 words
Files: 1
Skills in repo: 4
Repo updated: Oct 6, 2026
First seen: Oct 7, 2026
Licence: EUPL-1.2

At a glance

Build and configure Cecil static sites, with focused guidance for content, templates, and site generation.

Works in 6 steps: Download Cecil → Create a New Site → Configure the Site → …
Tasks that involve Static sites and blogs
SKILL.md covers When to Use This Skill, Project Structure, Cecil Fundamentals and Building a Cecil Site, plus 3 more sections
Calls php and curl; reaches cecil.app

What it does

Cecil is an agent skill from Cecilapp/Cecil. Build and configure Cecil static sites, with focused guidance for content, templates, and site generation.

Its SKILL.md is about 5.7k 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 Frontend & Design, covering Static sites and blogs. It works with PHP. The repository describes itself as: A simple and powerful content-driven static site generator.

When your agent uses it

Tasks that involve Static sites and blogs

Example prompts

“/cecil”

Workflow steps

6 steps, taken from the step headings in SKILL.md.

Download Cecil
Create a New Site
Configure the Site
Create Content
Create Templates (Optional)
Build the Site

What it can do on your machine

Read from SKILL.md and the folder at commit d5c73ab. 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:
- php
- curl
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
- cecil.app
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

Cecil loads about 5.7k tokens when it runs. Until then it costs about 28 tokens; SKILL.md has 1,884 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~28
When it runs · the whole SKILL.md, loaded when a task matches: ~5.7k

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

Its licence (EUPL-1.2) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,884 words (~5,704 tokens).

“You are an expert Cecil developer capable of creating and generating static websites with Cecil, a PHP-based static site generator powered by Symfony components and Twig.”

— opening of SKILL.md by Cecilapp, EUPL-1.2

name: cecil
license: EUPL-1.2

Outline of SKILL.md

Cecil Site Builder
When to Use This Skill
Project Structure
Directory Layout
Key Directories
Cecil Fundamentals
Architecture
Content Model
Nested Sections (Sub-sections)
Configuration
Building a Cecil Site
Step 1: Download Cecil
Step 2: Create a New Site
Step 3: Configure the Site
Step 4: Create Content
Step 5: Create Templates (Optional)
Step 6: Build the Site
CLI Commands
Template Development
Naming Convention
Lookup Rules (How Cecil Chooses a Template)
Built-in Templates
Metatags (partials/metatags.html.twig)
Template Variables
Multilingual Sites
Example Template
Built-in Partials and Utilities
Pagination
Custom Filters and Functions
Build Optimization

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/cecil of Cecilapp/Cecil.

Open the folder on GitHubat commit d5c73ab

Compare with similar skills

Cecil 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.

Cecil compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Cecil this skillCecilapp/Cecil	297	—	~5.7k	Automated safety check: Pass	EUPL-1.2	yesterday
Kill AI Slopyetone/kill-ai-slop	1.3k	—	~1.4k	Automated safety check: Pass	Apache-2.0	22 days ago
Nexusphpweb Site ConfigJustLookAtNow/pt_mate	503	—	~366	Automated safety check: Pass	MIT	2 days ago
Deploy To Hostinghostinger/api-mcp-server	159	—	~2.7k	Automated safety check: Notes	MIT	yesterday
Tailwindcss Developmentanonaddy/anonaddy	4.9k	10 repos	~865	Automated safety check: Pass	MIT	yesterday
MCP Developmentcoollabsio/coolify	63k	1 repos	~949	Automated safety check: Pass	MIT	today

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Questions about Cecil

What does Cecil do?

Build and configure Cecil static sites, with focused guidance for content, templates, and site generation. Cecil is an agent skill from Cecilapp/Cecil. Build and configure Cecil static sites, with focused guidance for content, templates, and site generation.

When should I use Cecil?

Cecil fits situations like: tasks that involve Static sites and blogs.

How do I install Cecil in Claude Code?

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

How do I install Cecil in Codex?

Run `npx skills add Cecilapp/Cecil --skill cecil -a codex`. Or copy the skill folder (skills/cecil in Cecilapp/Cecil) into .agents/skills/cecil in your project. Codex loads it when a task matches its description.

Can I use Cecil 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 Cecilapp/Cecil --skill cecil -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cecil, .gemini/skills/cecil, .github/skills/cecil and .opencode/skills/cecil in your project.

What does Cecil need to run?

Going by SKILL.md and its folder, Cecil needs the command-line tools its instructions call (php and curl).

Does Cecil access the network?

SKILL.md names 1 domain. In commands or code: cecil.app; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Cecil 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 Cecil use?

Cecil is published under the EUPL-1.2 licence (declared in SKILL.md).

How many tokens does Cecil use?

About 5.7k tokens (SKILL.md is roughly 23k 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 Cecil?

Skills that share tags, products or a category with Cecil: Kill AI Slop (yetone/kill-ai-slop, 1.3k stars), Nexusphpweb Site Config (JustLookAtNow/pt_mate, 503 stars), Deploy To Hosting (hostinger/api-mcp-server, 159 stars) and Tailwindcss Development (anonaddy/anonaddy, 4.9k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Cecil?

Cecilapp (a GitHub organization) maintains it in Cecilapp/Cecil, which has 297 GitHub stars. The repository holds 4 skills in this directory. The repository was last updated on October 6, 2026.

Source: Cecilapp/Cecil on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Cecil

Install Cecil

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

Kill AI Slop

Nexusphpweb Site Config

Deploy To Hosting

Tailwindcss Development

MCP Development

Tabler Astro Dev Server

More from Cecilapp/Cecil

Address PR Comments Cecil

Cecil Theme

Php Development

Questions about Cecil

Install Cecil

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

More from Cecilapp/Cecil

Related

Questions about Cecil