components_v2_build_container

Build a Components V2 Container (type 17) JSON node ready to nest into components_v2_send.

When to use

compose a card with accent color + multiple sections/separators.

MCP call example

{
  "name": "components_v2_build_container",
  "arguments": {
    "components": [
      {
        "type": 10,
        "content": "Hello from discord-mcp"
      }
    ]
  }
}

Input

Field	Type	Required	Constraints	Description
`components`	array<unknown>	yes	min items: `1`; max items: `10`	Up to 10 child nodes (Section/TextDisplay/MediaGallery/File/Separator/ActionRow). NOT another Container.
`accent_color`	integer	no	min: `0`; max: `16777215`	Hex RGB integer (0xFF0000 = red)
`spoiler`	boolean	no		Wrap container in spoiler tag

Complete input JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "components": {
      "minItems": 1,
      "maxItems": 10,
      "type": "array",
      "items": {},
      "description": "Up to 10 child nodes (Section/TextDisplay/MediaGallery/File/Separator/ActionRow). NOT another Container."
    },
    "accent_color": {
      "description": "Hex RGB integer (0xFF0000 = red)",
      "type": "integer",
      "minimum": 0,
      "maximum": 16777215
    },
    "spoiler": {
      "description": "Wrap container in spoiler tag",
      "type": "boolean"
    }
  },
  "required": [
    "components"
  ]
}

Returns

{component} - the JSON node. Pass it inside the components array of components_v2_send.

Example structured result

{
  "component": {
    "type": 17,
    "components": [
      {
        "type": 10,
        "content": "Hello from discord-mcp"
      }
    ]
  }
}

Output schema

Field	Type	Required	Constraints	Description
`component`	unknown	yes

Complete output JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "component": {}
  },
  "required": [
    "component"
  ],
  "additionalProperties": false
}

Annotations

Property	Value
Read-only	yes
Destructive	no
Idempotent	yes
Open-world	no
Confirmation required	no

Access and common errors

The components_v2 category must be enabled by MCP_CATEGORIES when an allowlist is set.
Access contract: scope=local; this tool uses no Discord credential (local or external operation) and is scoped to the local compiler/validator only.
No named Discord permission bit is asserted by this contract.
Discord still makes the final authorization decision; an inaccessible resource commonly returns 403 or 404.

Source

packages/mcp-core/src/tools/components-v2/build_container.ts