web-widgets: Command for GitHub Copilot

.github/prompts/opsx-onboard.prompt.md

opsx-onboard is a command for GitHub Copilot from mendix/web-widgets. It costs 14 tokens per session (3,304 once invoked), scanned A, a copy of OPSX: Onboard, Apache-2.0.

A guided lesson that walks through a complete OpenSpec change, from choosing a small coding task through planning, implementation, and archiving.

In plain words
What is it for?
Use it when onboarding to OpenSpec or teaching a developer how to take a change from idea to completed work.
Why use it?
It helps someone learn the workflow by applying it to a real task instead of reading instructions alone.

Command for GitHub Copilot

Written for GitHub Copilot: a Copilot chat mode or prompt.

This is mendix/web-widgets's own configuration. It tells GitHub Copilot how to work on web-widgets itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything web-widgets configures →

Reuse

Borrowing it

Nothing to install: this file belongs to mendix/web-widgets. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/mendix/web-widgets/main/.github/prompts/opsx-onboard.prompt.md
Clone the repo
git clone --depth 1 https://github.com/mendix/web-widgets

Made for: GitHub Copilot.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for opsx-onboard

README.md
[![agentmods](https://agentmods.dev/badge/commands/mendix/web-widgets/opsx-onboard/github.svg)](https://agentmods.dev/commands/mendix/web-widgets/opsx-onboard)
Your own site
<a href="https://agentmods.dev/commands/mendix/web-widgets/opsx-onboard"><img src="https://agentmods.dev/badge/commands/mendix/web-widgets/opsx-onboard/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for opsx-onboard

Your own site · 80×15
<a href="https://agentmods.dev/commands/mendix/web-widgets/opsx-onboard"><img src="https://agentmods.dev/badge/commands/mendix/web-widgets/opsx-onboard.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,304 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 89% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00014 $0.03304
Opus 5.5 $0.00006 $0.01322
Sonnet 5.5 $0.00003 $0.00661
Haiku 4.5 $0.00001 $0.00330

Measured 1mo ago against content hash 3f01fee8c8e6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

opsx-onboard scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

89% identical to OPSX: Onboard — 106 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.github/prompts/opsx-onboard.prompt.md · 568 lines

How it starts

The opening of the file, as written. The whole thing — 568 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Guide the user through their first complete OpenSpec workflow cycle. This is a teaching experience—you'll do real work in their codebase while explaining each step.


Preflight

Before starting, check if the OpenSpec CLI is installed:

# Unix/macOS
openspec --version 2>&1 || echo "CLI_NOT_INSTALLED"
# Windows (PowerShell)
# if (Get-Command openspec -ErrorAction SilentlyContinue) { openspec --version } else { echo "CLI_NOT_INSTALLED" }

If CLI not installed:

OpenSpec CLI is not installed. Install it first, then come back to /opsx:onboard.

Stop here if not installed.


Phase 1: Welcome

Display:

## Welcome to OpenSpec!

I'll walk you through a complete change cycle—from idea to implementation—using a real task in your codebase. Along the way, you'll learn the workflow by doing it.

**What we'll do:**
1. Pick a small, real task in your codebase
2. Explore the problem briefly
3. Create a change (the container for our work)
4. Build the artifacts: proposal → specs → design → tasks
5. Implement the tasks
6. Archive the completed change

**Time:** ~15-20 minutes

Let's start by finding something to work on.

Phase 2: Task Selection

Codebase Analysis

Scan the codebase for small improvement opportunities. Look for:

  1. TODO/FIXME comments - Search for TODO, FIXME, HACK, XXX in code files
  2. Missing error handling - catch blocks that swallow errors, risky operations without try-catch
  3. Functions without tests - Cross-reference src/ with test directories
  4. Type issues - any types in TypeScript files (: any, as any)
  5. Debug artifacts - console.log, console.debug, debugger statements in non-debug code
  6. Missing validation - User input handlers without validation

Also check recent git activity:

# Unix/macOS
git log --oneline -10 2>/dev/null || echo "No git history"
# Windows (PowerShell)
# git log --oneline -10 2>$null; if ($LASTEXITCODE -ne 0) { echo "No git history" }

Read the full file on GitHub · 568 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 568 lines · 14 tokens per session scan A 3f01fee8c8e6

Subscribe to this mod's changes

opsx-onboard is a command published in the GitHub repository mendix/web-widgets (40 stars, last pushed today), licensed Apache-2.0. It adds 14 tokens to every session and 3,304 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 89% identical to OPSX: Onboard, differing in 106 lines, and is treated as a copy.