Using Agent Skills
addyosmani/agent-skills
Meta-skill for choosing which workflow skill fits the task at hand, plus always-on habits: surface assumptions, stop on confusion, push back, keep it simple and stay in scope.
Initialize plugin in a project — install Iron Laws, auto-activation rules, and reference auto-loading into CLAUDE.md.
Install Phx Init
$ npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-init -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install oliver-kriska/claude-elixir-phoenix phx-init --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/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .claude/skills && cp -r skills-src/targets/pi/skills/phx-init .claude/skills/phx-init && 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 "phx-init" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/pi/skills/phx-init into .claude/skills/phx-init/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-init", 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/oliver-kriska/claude-elixir-phoenix/tree/main/targets/pi/skills/phx-initType 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 oliver-kriska/claude-elixir-phoenix --skill phx-init -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install oliver-kriska/claude-elixir-phoenix phx-init --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .agents/skills && cp -r skills-src/targets/pi/skills/phx-init .agents/skills/phx-init && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "phx-init" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/pi/skills/phx-init into .agents/skills/phx-init/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-init", 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 oliver-kriska/claude-elixir-phoenix --skill phx-init -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install oliver-kriska/claude-elixir-phoenix phx-init --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/targets/pi/skills/phx-init .cursor/skills/phx-init && 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 "phx-init" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/pi/skills/phx-init into .cursor/skills/phx-init/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-init", 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/oliver-kriska/claude-elixir-phoenix.git --path targets/pi/skills/phx-init--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 oliver-kriska/claude-elixir-phoenix --skill phx-init -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install oliver-kriska/claude-elixir-phoenix phx-init --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/targets/pi/skills/phx-init .gemini/skills/phx-init && 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 "phx-init" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/pi/skills/phx-init into .gemini/skills/phx-init/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-init", 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 oliver-kriska/claude-elixir-phoenix phx-initInstalls 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 oliver-kriska/claude-elixir-phoenix --skill phx-init -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .github/skills && cp -r skills-src/targets/pi/skills/phx-init .github/skills/phx-init && 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 "phx-init" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/pi/skills/phx-init into .github/skills/phx-init/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-init", 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 oliver-kriska/claude-elixir-phoenix --skill phx-init -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install oliver-kriska/claude-elixir-phoenix phx-init --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/oliver-kriska/claude-elixir-phoenix.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/targets/pi/skills/phx-init .opencode/skills/phx-init && 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 "phx-init" agent skill from https://github.com/oliver-kriska/claude-elixir-phoenix/tree/main/targets/pi/skills/phx-init into .opencode/skills/phx-init/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "phx-init", 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
phx-init- GitHub stars
- 565
- Token cost
- ~1.4k tokens
- SKILL.md length
- 523 words
- Files
- 3 (incl. references)
- Skills in repo
- 111
- Repo updated
- First seen
- Licence
- MIT
At a glance
Initialize plugin in a project — install Iron Laws, auto-activation rules, and reference auto-loading into CLAUDE.md.
- Works in 5 steps: Check Existing CLAUDE.md → Detect Project Stack → Handle Installation Modes → …
- Updating the plugin
- SKILL.md covers Usage, Iron Laws, Workflow and Content Template, plus 3 more sections
- Calls codex
What it does
Phx Init is an agent skill from oliver-kriska/claude-elixir-phoenix. Initialize plugin in a project — install Iron Laws, auto-activation rules, and reference auto-loading into CLAUDE.md. Use when setting up or updating the plugin.
Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/codex-review-guidelines.md` and `references/injectable-template.md`).
It sits in Agent Workflows, covering Agent instruction files. It works with Elixir. The repository describes itself as: Claude Code plugin for Elixir/Phoenix/LiveView — 26 specialist agents, Iron Laws enforcement, and Tidewave MCP integration. Plan features with parallel research agents, execute… The licence is MIT.
When your agent uses it
- Updating the plugin
- Tasks that involve Agent instruction files
Example prompts
- “/phx-init”
Workflow steps
5 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 9767a82. 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:
codex
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
Phx Init loads about 1.4k tokens when it runs, and up to ~4k if it reads all its reference files. Until then it costs about 43 tokens; SKILL.md has 523 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 oliver-kriska/claude-elixir-phoenix at commit 9767a82, republished under its MIT licence (© oliver-kriska). 523 words, ~1,412 tokens.
Download SKILL.mdSave it as
.claude/skills/phx-init/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.- name
- phx-init
- description
- Initialize plugin in a project — install Iron Laws, auto-activation rules, and reference auto-loading into CLAUDE.md. Use when setting up or updating the plugin.
Plugin Initialization
Install the Elixir/Phoenix plugin's behavioral instructions into the project's CLAUDE.md.
Usage
/skill:phx-init # First-time installation
/skill:phx-init --update # Update existing installation with latest rulesIron Laws
- NEVER overwrite content outside plugin markers — User-written CLAUDE.md rules must be preserved verbatim
- Always detect stack before generating — Never assume Phoenix/Ecto versions
- Always validate after installation — Verify markers present and stack correct
Workflow
Step 1: Check Existing CLAUDE.md
Use Glob to check if CLAUDE.md exists. Then use Grep to check for existing ELIXIR-PHOENIX-PLUGIN:START marker in CLAUDE.md.
Step 2: Detect Project Stack
Scan the project to customize the injected instructions:
Read mix.exs and use Grep to extract:
- Phoenix version: search for
phoenix.*"~>inmix.exs - Ecto version: search for
ecto.*"~>inmix.exs - Oban: search for
"oban"and"oban_pro"inmix.exs - Frameworks: search for
"ash","surface"inmix.exs - Tidewave: search for
"tidewave"inmix.exs - Project size: use Glob to count
lib/**/*.exfiles
Step 3: Handle Installation Modes
Mode A: Fresh Install (no CLAUDE.md or no markers)
- Create/append to CLAUDE.md
- Insert full behavioral instructions between markers
- Include only relevant sections based on detected stack
Mode B: Update (--update flag or markers exist)
- Find content between
<!-- ELIXIR-PHOENIX-PLUGIN:START -->and<!-- ELIXIR-PHOENIX-PLUGIN:END --> - Replace with latest behavioral instructions
- Preserve everything outside the markers
In both modes, CLAUDE.md content outside the plugin markers — user-written rules, project conventions, other plugin sections — stays verbatim (Iron Law 1)
Step 4: Generate Content
Write the following structure to CLAUDE.md:
<!-- ELIXIR-PHOENIX-PLUGIN:START -->
<!-- Last updated: {date} | Plugin version: 1.0 | Stack: Phoenix {version}, Ecto {version}, {optional: Oban, Tidewave} -->
# Elixir/Phoenix Plugin - Auto-Activation Rules
{Include all sections from the Content Template below, filtered by detected stack}
<!-- ELIXIR-PHOENIX-PLUGIN:END -->Step 4b: Offer Codex Review Guidelines (optional)
If command -v codex succeeds (or the user asks): offer to install a
managed ## Review guidelines block into the project's AGENTS.md —
honored by BOTH codex exec review locally and the Codex cloud PR
reviewer. Follow the install rules and exact block in
references/codex-review-guidelines.md: markers
ELIXIR-PHOENIX-REVIEW-GUIDELINES:START/END, upsert in place on
--update, never touch content outside markers, and STOP to ask if an
unmanaged ## Review guidelines section already exists. When codex is
absent and not requested, skip silently — never mention codex to users
who don't have it.
Show full SKILL.md (204 more words)Show less
Step 5: Output Summary
✅ Elixir/Phoenix plugin initialized
Detected stack:
- Phoenix {version}
- Ecto {version}
- {Oban standard | Oban Pro | not detected}
- {Tidewave ✓ | Tidewave not detected}
- {Ash Framework detected - Ecto patterns disabled | not detected}
Added to CLAUDE.md:
- Auto-activation rules (complexity detection, interview mode)
- Agent trigger patterns ({n} agents available)
- Reference auto-loading ({n} reference docs)
- Iron Laws enforcement ({n} laws)
- Verification rules
{- Codex review guidelines → AGENTS.md (only if installed in Step 4b)}
Run /skill:phx-init --update after plugin updates.
Run /skill:phx-audit for a full project health check.Content Template
The exact content to inject is in references/injectable-template.md.
Key structure:
- Routing table — which
/skill:phx-*command fits which kind of request - Iron Laws — STOP behavior on violations
- Conditional Sections — Include based on detected stack:
{OBAN_SECTION}— If Oban detected (not Pro){OBAN_PRO_SECTION}— If Oban Pro detected{ASH_SECTION}— If Ash Framework detected{TIDEWAVE_SECTION}— If Tidewave detected
- Verification — Mandatory after code changes
- Quick Reference — Skill routing table
Placeholder substitution:
| Placeholder | Source |
|---|---|
{DATE} | Current date |
{PHOENIX_VERSION} | From mix.exs |
{ECTO_VERSION} | From mix.exs |
{OPTIONAL_STACK} | Detected optional deps |
See references/injectable-template.md for full template with all placeholders and conditional sections.
Validation
After running /skill:phx-init:
- Check CLAUDE.md contains markers
- Verify detected stack matches actual project
- New session should:
- Auto-detect complexity when given tasks
- Stop on Iron Law violations
- Offer relevant workflows based on task
Error Handling
| Scenario | Action |
|---|---|
| CLAUDE.md read-only | Error: "Cannot modify CLAUDE.md - check permissions" |
| Markers corrupted | Warn, offer to remove and reinstall |
| Unknown Phoenix version | Use conservative defaults (all features enabled) |
| Not an Elixir project | Error: "No mix.exs found - is this an Elixir project?" |
Relationship to Other Commands
| Command | When to Use |
|---|---|
/skill:phx-init | First time, or after plugin updates |
/skill:phx-audit | Periodic project health check |
/skill:phx-verify | After code changes |
© oliver-kriska, 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 2 other files (references) in targets/pi/skills/phx-init of oliver-kriska/claude-elixir-phoenix.
- SKILL.md
- references/codex-review-guidelines.md
- references/injectable-template.md
Open the folder on GitHubat commit 9767a82
Compare with similar skills
Phx Init 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 |
|---|---|---|---|---|---|---|
| Phx Init this skilloliver-kriska/claude-elixir-phoenix | 565 | — | ~1.4k | Automated safety check: Pass | MIT | |
| Using Agent Skillsaddyosmani/agent-skills | 103k | 4 repos | ~2.4k | Automated safety check: Pass | MIT | |
| Claude ReflectBayramAnnakov/claude-reflect | 1.7k | 2 repos | ~627 | Automated safety check: Pass | MIT | |
| Neat-Freak Knowledge CloseoutKKKKhazix/khazix-skills | 21k | — | ~1.9k | Automated safety check: Pass | MIT | |
| Writing For Agentsbestofjs/bestofjs | 3.1k | 18 repos | ~2.7k | Automated safety check: Pass | MIT | |
| Task Observerrebelytics/one-skill-to-rule-them-all | 3.2k | 1 repos | ~12k | Automated safety check: Pass | CC-BY-4.0 |
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Neat-Freak Knowledge Closeout
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Brings project docs, agent rule files, authorized memory and leftover workspace files back in line with what the code and runtime actually do at the end of a work session.
Writing For Agents
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Task Observer
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- Official
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Related
Works with
Categories
Questions about Phx Init
What does Phx Init do?
Initialize plugin in a project — install Iron Laws, auto-activation rules, and reference auto-loading into CLAUDE.md. Phx Init is an agent skill from oliver-kriska/claude-elixir-phoenix.md.
When should I use Phx Init?
Phx Init fits situations like: updating the plugin; tasks that involve Agent instruction files.
How do I install Phx Init in Claude Code?
Run `npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-init -a claude-code`. Or copy the skill folder (targets/pi/skills/phx-init in oliver-kriska/claude-elixir-phoenix) into .claude/skills/phx-init in your project. Claude Code loads it when a task matches its description.
How do I install Phx Init in Codex?
Run `npx skills add oliver-kriska/claude-elixir-phoenix --skill phx-init -a codex`. Or copy the skill folder (targets/pi/skills/phx-init in oliver-kriska/claude-elixir-phoenix) into .agents/skills/phx-init in your project. Codex loads it when a task matches its description.
Can I use Phx Init 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 oliver-kriska/claude-elixir-phoenix --skill phx-init -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/phx-init, .gemini/skills/phx-init, .github/skills/phx-init and .opencode/skills/phx-init in your project.
What does Phx Init need to run?
Going by SKILL.md and its folder, Phx Init needs the command-line tools its instructions call (codex).
Does Phx Init 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 Phx Init 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 Phx Init use?
Phx Init 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 Phx Init use?
About 1.4k tokens (SKILL.md is roughly 5.6k 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 2.6k tokens, read only when the agent opens those files.
What are the alternatives to Phx Init?
Skills that share tags, products or a category with Phx Init: Using Agent Skills (addyosmani/agent-skills, 103k stars), Claude Reflect (BayramAnnakov/claude-reflect, 1.7k stars), Neat-Freak Knowledge Closeout (KKKKhazix/khazix-skills, 21k stars) and Writing For Agents (bestofjs/bestofjs, 3.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Phx Init?
oliver-kriska (a GitHub user) maintains it in oliver-kriska/claude-elixir-phoenix, which has 565 GitHub stars. The repository holds 111 skills in this directory. The repository was last updated on October 5, 2026.
Source: oliver-kriska/claude-elixir-phoenix on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.