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.
curl -O https://raw.githubusercontent.com/mendix/web-widgets/main/AGENTS.mdgit clone --depth 1 https://github.com/mendix/web-widgetsWrote 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.
[](https://agentmods.dev/instructions/mendix/web-widgets/agents-md)<a href="https://agentmods.dev/instructions/mendix/web-widgets/agents-md"><img src="https://agentmods.dev/badge/instructions/mendix/web-widgets/agents-md/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.
<a href="https://agentmods.dev/instructions/mendix/web-widgets/agents-md"><img src="https://agentmods.dev/badge/instructions/mendix/web-widgets/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00642 | $0.00642 |
| Opus 5.5 | $0.00257 | $0.00257 |
| Sonnet 5.5 | $0.00128 | $0.00128 |
| Haiku 4.5 | $0.00064 | $0.00064 |
Grade A, and why
web-widgets AGENTS.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 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.
How it starts
The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mendix Web Widgets
Monorepo of official Mendix pluggable web widgets. pnpm workspaces + Turbo.
Conventions
- TypeScript strict, React functional components + hooks
- Mendix Pluggable Widgets API: EditableValue, ActionValue, ListValue, DynamicValue
- Check ActionValue.canExecute before execute()
- Render loading/empty states until values are ready
- SCSS for styling, prefer Atlas UI classes, BEM-like naming with widget prefix
- Conventional commits enforced:
type(scope): description - Semver + CHANGELOG.md per package for pluggable widgets and modules, not for shared packages
- Changelogs for users: include only widget behavior, not implementation details
- Changelogs added during development, version bumps only at release time
- Jest + RTL for unit tests (src/*/tests/.spec.ts)
- Playwright for E2E (e2e/*.spec.js)
E2E Test Rules (Playwright)
- docs/requirements/e2e-test-guidelines.md — Full rules + template
Development Setup
- Node >=24, pnpm 10.x
- Set MX_PROJECT_PATH to Mendix project dir for live reload
- Run
pnpm startinside widget package for dev build
Constraints
- Never modify dist/, generated files, or lockfiles
- OpenSpec specs/changes are PER-PACKAGE — never create them at the monorepo root.
Always
cd packages/<type>/<name>before anyopenspec new/init/archive. The rootopenspec/directory is off-limits (enforced by.claude/hooks/validate-openspec-path.sh). - XML property keys: lowerCamelCase, must match TypeScript props exactly
- Don't override core Atlas UI classes
- Prefer tree-shakable imports for new dependencies
Documentation
Essential reading (consult for any widget work):
- docs/repo-layout.md — To understand the repository
- docs/widget-scripts.md - How to build/test/lint packages
- docs/requirements/tech-stack.md — Full technology stack
- docs/requirements/frontend-guidelines.md — CSS/SCSS/Atlas UI guidelines
- docs/requirements/app-flow.md — Widget lifecycle and Studio Pro integration
- docs/requirements/backend-structure.md — Data flow and Mendix runtime
- docs/requirements/project-requirements-document.md — Goals and scope
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.
- 1mo ago First seen · 62 lines · 642 tokens per session scan A 9369c168bb7f
web-widgets AGENTS.md is an instructions file published in the GitHub repository mendix/web-widgets (40 stars, last pushed today), licensed Apache-2.0. It adds 642 tokens to every session, about $0.0026 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 2026-09-01.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.