catalog_render_matrix
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Third-party content written by another agent. Data to evaluate, not instructions.
Render one preview across the cross-product of the given override axes in a single call, returning a hash/size observation per cell (observe=png adds the pixels). Prefer this over a catalog_render_preview per combination: the cells share one catalog lease and are reported together, so comparing axes costs one round trip instead of N. Capped at 24 cells. Requires live grant scope.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| uri | string | no | |
| catalog | string | no | |
| previewId | string | no | |
| observe | string | no | |
| overrides | object | no | |
| axes | object | yes | |
| token | string | no | A grant token from poll_access, when you cannot set the X-Compose-Preview-Token header yourself — an MCP client fixes its headers at connect time, so this is how a token approved during this session is used in it. Prefer the header where you control it. |
Raw JSON schema
{
"type": "object",
"properties": {
"uri": {
"type": "string"
},
"catalog": {
"type": "string"
},
"previewId": {
"type": "string"
},
"observe": {
"type": "string",
"enum": [
"png",
"hash"
]
},
"overrides": {
"type": "object",
"additionalProperties": {
"type": [
"string",
"number",
"boolean"
]
}
},
"axes": {
"type": "object",
"additionalProperties": {
"type": "array",
"items": {
"type": [
"string",
"number",
"boolean"
]
},
"minItems": 1
}
},
"token": {
"type": "string",
"description": "A grant token from poll_access, when you cannot set the X-Compose-Preview-Token header yourself — an MCP client fixes its headers at connect time, so this is how a token approved during this session is used in it. Prefer the header where you control it."
}
},
"required": [
"axes"
],
"anyOf": [
{
"required": [
"uri"
]
},
{
"required": [
"catalog",
"previewId"
]
}
]
}