Use it when building form scripts, ribbon actions, and other client-side Dynamics 365 web resources, especially when deciding where business logic should live and how solutions should be versioned.

It helps avoid deprecated or unsupported interfaces and keeps business logic maintainable and testable. It also reduces slow form loading and problems during platform upgrades.

How calsora/power-platform-github-copilot-kit configures GitHub Copilo

Q: What is power-platform-github-copilot-kit d365-webresources.instructions.md?

A set of guidelines for writing JavaScript used in Dynamics 365 and Power Platform web resources, which are browser-based scripts added to business forms and pages. It covers supported APIs, code structure, security, performance, and compatibility with platform updates.

Reuse

Borrowing it

Nothing to install: this file belongs to calsora/power-platform-github-copilot-kit. 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/calsora/power-platform-github-copilot-kit/main/.github/instructions/d365-webresources.instructions.md

Clone the repo

git clone --depth 1 https://github.com/calsora/power-platform-github-copilot-kit

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/calsora/power-platform-github-copilot-kit/d365-webresources/github.svg)](https://agentmods.dev/instructions/calsora/power-platform-github-copilot-kit/d365-webresources)

Your own site

<a href="https://agentmods.dev/instructions/calsora/power-platform-github-copilot-kit/d365-webresources"><img src="https://agentmods.dev/badge/instructions/calsora/power-platform-github-copilot-kit/d365-webresources/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/calsora/power-platform-github-copilot-kit/d365-webresources"><img src="https://agentmods.dev/badge/instructions/calsora/power-platform-github-copilot-kit/d365-webresources.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,295 This file is loaded in full into every session.

When invoked 1,295 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found 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.

Model	Per session	Once invoked
Fable 5.1	$0.01295	$0.01295
Opus 5.5	$0.00518	$0.00518
Sonnet 5.5	$0.00259	$0.00259
Haiku 4.5	$0.00129	$0.00129

Measured 2mo ago against content hash 634f2179e5e4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

power-platform-github-copilot-kit d365-webresources.instructions.md 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 2mo 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.

.github/instructions/d365-webresources.instructions.md · 141 lines

How it starts

The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Dynamics 365 JavaScript Web Resource Best Practices

This guidance describes reusable patterns and anti-patterns for client-side JavaScript used in Dynamics 365 / Power Platform web resources.

Severity levels:

CRITICAL — Code that creates functional failure, security risk, or unsupported behavior in Dynamics 365.
IMPORTANT — Code that reduces maintainability, performance, or compatibility with platform upgrades.
SUGGESTION — Improvements for readability, tooling, or developer experience.

Core principles

Use supported client API and avoid unsupported DOM or internal Xrm object access.
Keep business logic out of web resources when possible; prefer Power Fx, business rules, plugins, or Power Automate for process logic.
Build modular, testable JavaScript with clear namespace/closure boundaries.
Use solution-aware web resources and version them with solution layering.
Optimize for performance on form load and ribbon actions.

Supported API and platform compatibility

Rule	Summary	Severity
Use `formContext` instead of global `Xrm.Page`	`Xrm.Page` is deprecated. Use the execution context to get the form context.	IMPORTANT
Avoid unsupported DOM selectors	Do not query or modify DOM elements directly with `document.querySelector` or `getElementById`.	CRITICAL
Use supported client-side events only	Register code through form event handlers or ribbon commands, not by attaching custom DOM listeners to internal controls.	IMPORTANT
Avoid proprietary browser APIs	Target the browser support model for Dynamics 365 and avoid APIs not supported by supported browsers.	SUGGESTION

Code structure anti-patterns (C1-C5)

C1: Global variables without namespace

Severity: IMPORTANT
Detection: var myValue = ... or window.myValue in a web resource.
Use a single namespace object or Immediately Invoked Function Expression (IIFE) to avoid collisions.

// GOOD
var MyApp = MyApp || {};
MyApp.ContactForm = {
  onLoad: function (executionContext) {
    var formContext = executionContext.getFormContext();
  }
};

Read the full file on GitHub · 141 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.

2mo ago First seen · 141 lines · 1,295 tokens per session scan A 634f2179e5e4

Subscribe to this mod's changes

power-platform-github-copilot-kit d365-webresources.instructions.md is an instructions file published in the GitHub repository calsora/power-platform-github-copilot-kit (6 stars, last pushed 27d ago), licensed MIT. It adds 1,295 tokens to every session, about $0.0052 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Frontend

power-platform-github-copilot-kit d365-webresources.instructions.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
power-platform-github-copilot-kit d365-webresources.instructions.mdcalsora/power-platform-github-copilot-kit	Instructions file	6	27d ago	MIT	A	1,295	GitHub Copilot
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

power-platform-github-copilot-kit: Instructions file for GitHub Copilot