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gantt-roadmap

Productivity
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Turn a plan or set of milestones into a timeline / Gantt chart. Use when asked to build a roadmap, schedule phases, show a project timeline, or visualize what happens when. Produces a ready-to-render Mermaid Gantt chart (renders live, exportable as PNG/SVG) — and, because it has real dates, the result also exports to a calendar (.ics) — plus notes on the critical path and risks.

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How to use this skill

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  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/mohitagw15856/pm-claude-skills/blob/HEAD/skills/gantt-roadmap/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/gantt-roadmap/. Do not write files or run scripts until I approve.

After I approve, install the complete skill folder, including required referenced files, into that project location. Verify it is discoverable, then tell me its actual invocation name and how to use it. Do not claim it is installed until you have verified it.

Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

Gantt / Roadmap Skill

A list of tasks doesn't show what runs in parallel, what blocks what, or where the crunch is. A Gantt chart does. This skill turns a plan into a Mermaid Gantt chart with phases (sections), dated tasks, dependencies, and milestones — a real schedule, not a wish list. Because the output carries real dates, the playground can also export it straight to a calendar (.ics).

Required Inputs

Ask for these only if they aren't already provided:

  • The work — phases and tasks to schedule.
  • Timing — a start date, and durations or end dates (or relative ordering you can date from the start).
  • Dependencies — what must finish before what can start.
  • Milestones — the dated checkpoints (kickoff, beta, GA, launch).

If exact dates aren't given, anchor to a start date and lay tasks out by stated duration/order; flag the dates as planning estimates.

Output Format

[Project] — roadmap

One line on the time span and goal.

gantt
    title [Project] roadmap
    dateFormat YYYY-MM-DD
    axisFormat %b %d
    section Discovery
        Research            :done,    r1, 2026-07-01, 10d
        Spec sign-off       :milestone, m1, 2026-07-15, 0d
    section Build
        Core build          :active,  b1, after m1, 20d
        Integrations        :         b2, after b1, 10d
    section Launch
        Beta                :milestone, m2, 2026-08-25, 0d
        GA                  :milestone, m3, 2026-09-10, 0d

Critical path — the chain of dependent tasks that sets the end date.

Risks / buffers — where the schedule is tight, what could slip, where buffer exists.

Assumptions — any dates you estimated rather than were given.

Mermaid Rules (so it renders)

  • Start with gantt, then title, dateFormat YYYY-MM-DD, optional axisFormat.
  • Group with section Name. Task line: Label : [status,] id, start, duration (e.g. :active, b1, 2026-07-01, 20d).
  • Dependencies use after <id> as the start. Milestones use the milestone tag with 0d.
  • Use real ISO dates (YYYY-MM-DD) so the calendar (.ics) export works.

Quality Checks

  • Tasks are grouped into phases (sections) and have real start dates/durations
  • Dependencies use after so the schedule reflects what blocks what
  • Milestones are marked as milestones, not full-width bars
  • The critical path is identified, with risks/buffers noted
  • The Mermaid block renders, and dates are ISO so .ics export works

Anti-Patterns

  • Do not list tasks with no dates or durations — that's a checklist, not a timeline
  • Do not ignore dependencies — overlapping things that can't overlap is a fake plan
  • Do not draw milestones as long bars — they're points in time
  • Do not use ambiguous date formats — stick to YYYY-MM-DD
  • Do not present estimated dates as commitments — flag assumptions

Based On

Project scheduling (Gantt charts, critical path, milestones, dependencies), expressed as renderable Mermaid.