create_gantt
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Create a Gantt chart from a task list — no account or API key needed. YOU author the plan: list the tasks in execution order with realistic working-day durations and dependencies (0-based positions of earlier tasks; use { task, type, lag } for start-to-start/finish-to-finish links or lag). Milestones have duration 0. Only add a dependency where a task truly needs another one finished - independent tasks should run in PARALLEL (share a predecessor, or take no dependencies at all and start at the project start). Group tasks into top-level phases for a structured plan/WBS: the phase task gets isPhase: true, its tasks get parent = the position of the phase. LoopGantt schedules it with its critical-path engine and returns a picture of the chart, the dates, the critical path and a link where the user can view, export (PNG/PDF) and save the chart. Always show the user the link. Tasks with a due date take deadline: YYYY-MM-DD (a marker - the reply reports the fit). Use create_gantt when the user wants a chart to open, export or save; use schedule_project instead for what-if date math where nothing should be stored.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| name | string | yes | Project name |
| description | string | no | Optional one-line description |
| startDate | string | no | YYYY-MM-DD (defaults to today) |
| deadline | string | no | Optional deadline YYYY-MM-DD - drawn on the chart; compare with the returned projectEndDate and warn the user if the plan overshoots |
| workDays | array | no | Working weekdays as ISO numbers 1 (Mon) … 7 (Sun). Default Mon–Fri. |
| holidays | array | no | Non-working dates, YYYY-MM-DD |
| tasks | array | yes |
Raw JSON schema
{
"type": "object",
"required": [
"name",
"tasks"
],
"properties": {
"name": {
"type": "string",
"description": "Project name"
},
"description": {
"type": "string",
"description": "Optional one-line description"
},
"startDate": {
"type": "string",
"description": "YYYY-MM-DD (defaults to today)"
},
"deadline": {
"type": "string",
"description": "Optional deadline YYYY-MM-DD - drawn on the chart; compare with the returned projectEndDate and warn the user if the plan overshoots"
},
"workDays": {
"type": "array",
"items": {
"type": "integer",
"minimum": 1,
"maximum": 7
},
"description": "Working weekdays as ISO numbers 1 (Mon) … 7 (Sun). Default Mon–Fri."
},
"holidays": {
"type": "array",
"items": {
"type": "string"
},
"description": "Non-working dates, YYYY-MM-DD"
},
"tasks": {
"type": "array",
"minItems": 1,
"maxItems": 300,
"items": {
"type": "object",
"required": [
"name"
],
"properties": {
"name": {
"type": "string",
"description": "Task name"
},
"duration": {
"type": "integer",
"minimum": 0,
"description": "Working days (default 1). 0 makes the task a milestone."
},
"isMilestone": {
"type": "boolean",
"description": "Milestone (zero duration, drawn as a diamond)"
},
"isPhase": {
"type": "boolean",
"description": "Top-level phase (a group). Tasks join it with parent = this position. Phases take no dependencies and no parent; their dates become the envelope of their tasks."
},
"parent": {
"type": "integer",
"minimum": 0,
"description": "Position (0-based) of an EARLIER task with isPhase=true that this task belongs to"
},
"description": {
"type": "string"
},
"deadline": {
"type": "string",
"description": "Finish-by date YYYY-MM-DD for a task with a due date (essay due, exam day, launch). A MARKER: the task is still scheduled normally and the reply reports its fit - buffer or days late."
},
"dependencies": {
"type": "array",
"description": "Predecessors: positions (0-based) of EARLIER tasks in this list, or objects { task, type: FS|SS|FF|SF, lag } for typed links / lag in days",
"items": {
"oneOf": [
{
"type": "integer",
"minimum": 0
},
{
"type": "object",
"required": [
"task"
],
"properties": {
"task": {
"type": "integer",
"minimum": 0
},
"type": {
"type": "string",
"enum": [
"FS",
"SS",
"FF",
"SF"
]
},
"lag": {
"type": "integer"
}
}
}
]
}
}
}
}
}
}
}