sigma-studio-webmcp-demo.choco954303.chatgpt.site
Sigma Studio
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 6 · Act 19 · Transact 1 · Score: Not yet scored
Tool inspector
create_overlay
Create one drawable overlay shape, text object, or callout. kind:"text" accepts markdown for multi-paragraph rich text (headings, lists, $math$). Tables and graphs use their dedicated insert tools. Use semantic placement relative to a block when possible; use absolute page coordinates only for deliberate composition. Before the first edit, call get_agent_instructions and inspect_document. This appends to the one pending human-reviewed draft and never applies changes automatically.
Page: /sigma/
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
expectedRevision |
integer | yes | Revision returned by inspect_document. Required for every write. |
targetId |
string | no | Anchor block ID, END_OF_DOCUMENT is not valid for overlays. Use "CANVAS" on a whiteboard document together with absolute x/y. |
area |
string | no | — |
id |
string | no | — |
kind |
string | yes | — |
x |
number | no | Absolute page X coordinate in pixels. |
y |
number | no | Absolute page Y coordinate in pixels. |
placement |
object | no | — |
w |
number | no | — |
h |
number | no | — |
rotationDeg |
number | no | Clockwise rotation in degrees. |
label |
string | no | — |
text |
string | no | — |
tex |
string | no | — |
markdown |
string | no | Multi-paragraph rich text for kind:"text" only. Same Markdown rules as insert_markdown (paragraphs, headings, nested lists, fenced code, bold, italic, $...$ and $$...$$ math, \$ for a literal dollar). Mutually exclusive with text/tex/label. |
points |
array | no | — |
start |
object | no | — |
end |
object | no | — |
closed |
boolean | no | — |
color |
string | no | — |
fill |
string | no | — |
fillColor |
string | no | — |
fillOpacity |
number | no | — |
strokeOpacity |
number | no | — |
opacity |
number | no | — |
dash |
string | no | — |
size |
string | no | — |
fontSize |
number | no | — |
arrowheadStart |
string | no | — |
arrowheadEnd |
string | no | — |
tailBaseStart |
object | no | — |
tailBaseEnd |
object | no | — |
tailTip |
object | no | — |
cornerRadius |
number | no | — |
startAngleDeg |
number | no | — |
endAngleDeg |
number | no | — |
r |
number | no | — |
rx |
number | no | — |
ry |
number | no | — |
stackLayer |
string | no | — |
reserveSpace |
boolean | no | — |
Raw JSON schema
{
"type": "object",
"properties": {
"expectedRevision": {
"type": "integer",
"minimum": 0,
"description": "Revision returned by inspect_document. Required for every write."
},
"targetId": {
"type": "string",
"description": "Anchor block ID, END_OF_DOCUMENT is not valid for overlays. Use \"CANVAS\" on a whiteboard document together with absolute x/y."
},
"area": {
"type": "string",
"enum": [
"lead",
"prompt",
"solution",
"hints"
]
},
"id": {
"type": "string"
},
"kind": {
"type": "string",
"enum": [
"rectangle",
"circle",
"ellipse",
"triangle",
"diamond",
"pentagon",
"blockArrow",
"arc",
"sector",
"arrow",
"line",
"polyline",
"curve",
"freehand",
"highlight",
"text",
"callout"
]
},
"x": {
"type": "number",
"description": "Absolute page X coordinate in pixels."
},
"y": {
"type": "number",
"description": "Absolute page Y coordinate in pixels."
},
"placement": {
"type": "object",
"properties": {
"anchorBlockId": {
"type": "string"
},
"position": {
"type": "string",
"enum": [
"below",
"above",
"rightOf",
"leftOf"
]
},
"offsetX": {
"type": "number"
},
"offsetY": {
"type": "number"
}
},
"required": [
"anchorBlockId",
"position"
],
"additionalProperties": false
},
"w": {
"type": "number",
"exclusiveMinimum": 0
},
"h": {
"type": "number",
"exclusiveMinimum": 0
},
"rotationDeg": {
"type": "number",
"description": "Clockwise rotation in degrees."
},
"label": {
"type": "string"
},
"text": {
"type": "string"
},
"tex": {
"type": "string"
},
"markdown": {
"type": "string",
"description": "Multi-paragraph rich text for kind:\"text\" only. Same Markdown rules as insert_markdown (paragraphs, headings, nested lists, fenced code, bold, italic, $...$ and $$...$$ math, \\$ for a literal dollar). Mutually exclusive with text/tex/label."
},
"points": {
"type": "array",
"minItems": 2,
"maxItems": 256,
"items": {
"type": "object",
"properties": {
"x": {
"type": "number"
},
"y": {
"type": "number"
}
},
"required": [
"x",
"y"
],
"additionalProperties": false
}
},
"start": {
"type": "object",
"properties": {
"x": {
"type": "number"
},
"y": {
"type": "number"
}
},
"required": [
"x",
"y"
],
"additionalProperties": false
},
"end": {
"type": "object",
"properties": {
"x": {
"type": "number"
},
"y": {
"type": "number"
}
},
"required": [
"x",
"y"
],
"additionalProperties": false
},
"closed": {
"type": "boolean"
},
"color": {
"type": "string"
},
"fill": {
"type": "string",
"enum": [
"none",
"solid"
]
},
"fillColor": {
"type": "string"
},
"fillOpacity": {
"type": "number",
"minimum": 0,
"maximum": 1
},
"strokeOpacity": {
"type": "number",
"minimum": 0,
"maximum": 1
},
"opacity": {
"type": "number",
"minimum": 0,
"maximum": 1
},
"dash": {
"type": "string",
"enum": [
"solid",
"dashed",
"dotted"
]
},
"size": {
"type": "string",
"enum": [
"s",
"m",
"l",
"xl"
]
},
"fontSize": {
"type": "number",
"exclusiveMinimum": 0
},
"arrowheadStart": {
"type": "string"
},
"arrowheadEnd": {
"type": "string"
},
"tailBaseStart": {
"type": "object",
"properties": {
"x": {
"type": "number"
},
"y": {
"type": "number"
}
},
"required": [
"x",
"y"
],
"additionalProperties": false
},
"tailBaseEnd": {
"type": "object",
"properties": {
"x": {
"type": "number"
},
"y": {
"type": "number"
}
},
"required": [
"x",
"y"
],
"additionalProperties": false
},
"tailTip": {
"type": "object",
"properties": {
"x": {
"type": "number"
},
"y": {
"type": "number"
}
},
"required": [
"x",
"y"
],
"additionalProperties": false
},
"cornerRadius": {
"type": "number",
"minimum": 0
},
"startAngleDeg": {
"type": "number"
},
"endAngleDeg": {
"type": "number"
},
"r": {
"type": "number",
"exclusiveMinimum": 0
},
"rx": {
"type": "number",
"exclusiveMinimum": 0
},
"ry": {
"type": "number",
"exclusiveMinimum": 0
},
"stackLayer": {
"type": "string",
"enum": [
"foreground",
"background"
]
},
"reserveSpace": {
"type": "boolean"
}
},
"required": [
"expectedRevision",
"kind"
],
"additionalProperties": false
}
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