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Agent skill

Dev

by justrach in justrach/merjs

Build and start the merjs dev server with hot reload. An agent skill from justrach/merjs.

MITAuto-check passedDevelopment

Install Dev

skills CLI
$ npx skills add justrach/merjs --skill dev -a claude-code

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

GitHub CLI
$ gh skill install justrach/merjs dev --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/justrach/merjs.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/dev .claude/skills/dev && 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/

Facts

Skill name
dev
GitHub stars
356
Token cost
~222 tokens
SKILL.md length
74 words
Files
1
Skills in repo
6
Repo updated
First seen
Licence
MIT

At a glance

Build and start the merjs dev server with hot reload. An agent skill from justrach/merjs.

  • Works in 6 steps: Kill any existing process on port 3000 → Regenerate routes (in case pages changed) → Build the project → …
  • The user wants to run
  • SKILL.md covers Steps and Flags
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Dev is an agent skill from justrach/merjs. Build and start the merjs dev server with hot reload. Use when the user wants to run, start, or serve the project.

Its SKILL.md is about 220 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 Development. It works with WebAssembly. The repository describes itself as: A Zig-native web framework. File-based routing, SSR, type-safe APIs, WASM client interactivity. No Node. No npm. Just zig build serve. The licence is MIT.

When your agent uses it

  • The user wants to run
  • Serve the project

Example prompts

  • “/dev”

Workflow steps

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

  1. Kill any existing process on port 3000
  2. Regenerate routes (in case pages changed)
  3. Build the project
  4. Start the dev server in the background
  5. Wait 2 seconds, then verify the server is listening
  6. Tell the user the server is running at http://localhost:3000

What it can do on your machine

Read from SKILL.md and the folder at commit 28b53d8. 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 (its code samples are bash).

    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

Dev loads about 222 tokens when it runs. Until then it costs about 30 tokens; SKILL.md has 74 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~30
When it runs · the whole SKILL.md, loaded when a task matches
~222

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 justrach/merjs at commit 28b53d8, republished under its MIT licence (© justrach). 74 words, ~222 tokens.

Download SKILL.mdSave it as .claude/skills/dev/SKILL.md (or your agent's skills folder).
name
dev
description
Build and start the merjs dev server with hot reload. Use when the user wants to run, start, or serve the project.
disable-model-invocation
true

Start merjs dev server

Steps

  1. Kill any existing process on port 3000:

    bash
    lsof -ti :3000 | xargs kill -9 2>/dev/null

  2. Regenerate routes (in case pages changed):

    bash
    zig build codegen

  3. Build the project:

    bash
    zig build

  4. Start the dev server in the background:

    bash
    ./zig-out/bin/merjs --port 3000 &

  5. Wait 2 seconds, then verify the server is listening:

    bash
    lsof -i :3000 -sTCP:LISTEN

  6. Tell the user the server is running at http://localhost:3000

Flags

  • --port N — listen on a different port
  • --no-dev — disable hot reload (SSE watcher)
  • --prerender — pre-render SSG pages to dist/ and exit

© justrach, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .claude/skills/dev of justrach/merjs.

Open the folder on GitHubat commit 28b53d8

Compare with similar skills

Dev 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.

Dev compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Dev this skilljustrach/merjs356—~222Automated safety check: PassMIT
Connection Import WasmfeigeCode/navop1.8k—~2.7kAutomated safety check: PassCustom licence
Changesetwhitphx/stlite1.7k—~1.9kAutomated safety check: PassApache-2.0
Code Reviewziggy42/epsilon439—~1.7kAutomated safety check: PassApache-2.0
Style Checkernoumena-labs/Sipp121—~1.4kAutomated safety check: PassApache-2.0
Working With Nixxmtp/libxmtp121—~1.4kAutomated safety check: PassMIT

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  • Deploy

    justrach/merjs

    Full production build — codegen, compile, prerender, and prepare for deployment.

    356 GitHub stars~171 tokensUpdated 1 mo ago
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Works with

Categories

Questions about Dev

What does Dev do?

Build and start the merjs dev server with hot reload. An agent skill from justrach/merjs. Dev is an agent skill from justrach/merjs. Build and start the merjs dev server with hot reload.

When should I use Dev?

Dev fits situations like: the user wants to run; serve the project.

How do I install Dev in Claude Code?

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

How do I install Dev in Codex?

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

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

What does Dev need to run?

SKILL.md names no scripts, command-line tools or credentials: Dev is instructions for the agent only.

Does Dev 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 Dev 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 Dev use?

Dev 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 Dev use?

About 222 tokens (SKILL.md is roughly 888 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 Dev?

Skills that share tags, products or a category with Dev: Connection Import Wasm (feigeCode/navop, 1.8k stars), Changeset (whitphx/stlite, 1.7k stars), Code Review (ziggy42/epsilon, 439 stars) and Style Checker (noumena-labs/Sipp, 121 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Dev?

justrach (a GitHub user) maintains it in justrach/merjs, which has 356 GitHub stars. The repository holds 6 skills in this directory. The repository was last updated on August 26, 2026.

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