What is gantt AGENTS.md?

Repository instructions for developers and coding agents working on DHTMLX Gantt, an open-source JavaScript chart library for planning work over time.

Use them to find source, extension, style, sample, build, and test files, and to follow the documented build and verification process.

They explain the code layout, generated files, development commands, and repository rules so changes fit the project.

How DHTMLX/gantt configures Codex and OpenCode

About the project

DHTMLX Gantt is an open-source JavaScript component that displays project schedules as timelines, including tasks, dependencies, and drag-and-drop editing. It helps developers add Gantt charts to project-management interfaces using plain JavaScript or frameworks such as React, Angular, Vue, and Svelte. The catalogue instruction supports work with this component.

DHTMLX/gantt · 1,870 stars · on GitHub · dhtmlx.com

Reuse

Borrowing it

Nothing to install: this file belongs to DHTMLX/gantt. 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/DHTMLX/gantt/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/DHTMLX/gantt

Made for: Codex, OpenCode.

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/dhtmlx/gantt/agents-md/github.svg)](https://agentmods.dev/instructions/dhtmlx/gantt/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/dhtmlx/gantt/agents-md"><img src="https://agentmods.dev/badge/instructions/dhtmlx/gantt/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/dhtmlx/gantt/agents-md"><img src="https://agentmods.dev/badge/instructions/dhtmlx/gantt/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 636 This file is loaded in full into every session.

When invoked 636 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	$0.00636	$0.00636
Opus 5.5	$0.00254	$0.00254
Sonnet 5.5	$0.00127	$0.00127
Haiku 4.5	$0.00064	$0.00064

Measured 2mo ago against content hash b816f7b7143a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gantt 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 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.

AGENTS.md · 47 lines

How it starts

The opening of the file, as written. The whole thing — 47 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Guidance for AI coding agents working in this repository.

What this is

DHTMLX Gantt, MIT edition — an open source JavaScript Gantt chart library. The repository ships library sources, samples, and a smoke test suite. It is generated from an internal source tree on each release (see CONTRIBUTING.md), so structural refactors should stay minimal and focused.

Layout

Path	Content
`src/dhtmlxgantt.ts`	library entry point
`src/core/`	core: datastores, task data layer, UI (grid, timeline, lightbox), worktime
`src/core/plugins/`	always-on plugins (batch update, task types, formatters…)
`src/ext/`	opt-in extensions activated via `gantt.plugins({...})` (tooltip, quick_info, keyboard_navigation…)
`src/css/`	LESS styles, fonts, skins
`src/locale/`	locales
`samples/`	runnable demos; served by `npm run start`, and the corpus the smoke test loads
`scripts/`	build/dev/test node scripts, sample-data backend
`codebase/`	build output (generated; never edit by hand)

Commands

npm install
npm run build          # vite build -> codebase/ + d.ts
npm run start          # watch build + backend (:9200) + vite devserver
npm run test           # build + smoke test: every sample loads without console errors
npm run test 07_grid   # smoke just one samples folder
npm run lint           # eslint over src/ (flat config, intentionally lax)

Working on the code

The build must stay green: npm run build after any src/ change, and npm run lint should pass.
npm run test is a smoke pass: it loads every sample headless and fails on a page error or console.error. It is the regression net — keep it green after src/ changes.
Sample pages reference ../../codebase/dhtmlxgantt.js — run a build before opening them.
src/types.d.ts declares the compile-time globals (VERSION, LICENSE, …) injected by vite define.
Some modules are intentional basic implementations of Pro features (e.g. src/core/ui/render/dummy_layer.js, re-export shims like src/core/ui/grid/resource_grid.js, and src/core/worktime/strategy/calendar_strategy.js which re-exports the disabled no_work_time strategy — working-time calendars are out of scope). Do not "complete" them — the Pro feature set is out of scope for this edition (see README).

Read the full file on GitHub · 47 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 · 47 lines · 636 tokens per session scan A b816f7b7143a

Subscribe to this mod's changes

gantt AGENTS.md is an instructions file published in the GitHub repository DHTMLX/gantt (1,870 stars, last pushed 2mo ago), licensed MIT. It adds 636 tokens to every session, about $0.0025 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 2026-08-30.

Planning Project Management dhtmlx gantt gantt-chart ganttjs javascript-gantt

gantt AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
gantt AGENTS.mdDHTMLX/gantt	Instructions file	1.9k	2mo ago	MIT	A	636	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	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

gantt: Instructions file for Codex