pixoo-mcp-server

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pixoo_push_image

pixoo_push_image

Idempotent

Load an image from an absolute path or HTTPS URL, resize it to fit Pixoo LED grids, optionally push it to the display, and preview the downsampled result or animation frames.

Instructions

Load an image (absolute local path or https URL), resize it to fit the LED grid, and optionally push it to the display. An animated GIF or WebP pushes as an animation of up to 40 frames, sampled evenly from a longer source and played at the speed that keeps its loop length. Returns the downsampled result as an image content block so you see exactly what the display received — a grid of every frame for an animation. Nearest-neighbor kernel preserves pixel art; use lanczos3 or mitchell for photos. finish reduces the result to a small or fixed palette, optionally dithered.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`fit`	No	Resize fit mode: contain (letterbox), cover (crop to fill), fill (stretch).	contain
`push`	No	Push the resized image to the device (default: true).
`speed`	No	Milliseconds per frame for an animated source (10–2000). Default: the source's total duration over the pushed frame count, or 150 when it records no delays. A still ignores it.
`finish`	No	Reduce the image to a palette before it reaches the panel: exactly one of colors (2–256, built from the image) or palette (1–256 hex or named colors), plus dither. Transparent pixels stay unlit and are not counted. The preview shows the finished frame.
`kernel`	No	Resize kernel: nearest for pixel art, lanczos3 for photos, mitchell for a balance.	nearest
`source`	Yes	Absolute local file path or https (not http) URL of the image to display; a relative path is rejected. An animated GIF or WebP, whatever its file name, pushes as an animation.

Output Schema

TableJSON Schema

Name	Required	Description
`error`	No	Present when the call failed. Absent on success.
`speed`	No	Milliseconds per frame the animation plays at. Absent for a still.
`frames`	No	Frames rendered and pushed: 1 for a still, 2–40 for an animation.
`notice`	No	Warning or informational message.
`pushed`	No	True when the device acknowledged the push.
`deviceState`	No	Device state after the push. Absent when push: false.
`outputFiles`	No	Absolute paths to saved preview files: a PNG for a still, a GIF at the pushed speed for an animation. Present only when PIXOO_OUTPUT_DIR is configured.
`sourceFrames`	No	Frames in the source before sampling down to 40: 1 for a still.

Schema Changelog

Changes observed during successful MCP inspections.

Changed10 schema fields changedv1.3.0Sep 27, 2026

addedInput schema / properties / finish

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "description": "Reduce to a palette built from the image.",
+      "properties": {
+        "colors": {
+          "description": "Build a palette of at most this many colors (2–256) from the image itself.",
+          "maximum": 256,
+          "minimum": 2,
+          "type": "integer"
+        },
+        "dither": {
+          "default": "none",
+          "description": "How palette colors are placed: none maps each pixel to its nearest color; bayer4 mixes the two nearest in an ordered 4×4 pattern; floyd-steinberg diffuses the difference to neighboring pixels, smoothest on photos.",
+          "enum": [
+            "none",
+            "bayer4",
+            "floyd-steinberg"
+          ],
+          "type": "string"
+        }
+      },
+      "required": [
+        "colors"
+      ],
+      "type": "object"
+    },
+    {
+      "additionalProperties": false,
+      "description": "Reduce to a fixed palette.",
+      "properties": {
+        "dither": {
+          "default": "none",
+          "description": "How palette colors are placed: none maps each pixel to its nearest color; bayer4 mixes the two nearest in an ordered 4×4 pattern; floyd-steinberg diffuses the difference to neighboring pixels, smoothest on photos.",
+          "enum": [
+            "none",
+            "bayer4",
+            "floyd-steinberg"
+          ],
+          "type": "string"
+        },
+        "palette": {
+          "description": "Map every pixel to these colors (1–256 entries).",
+          "items": {
+            "description": "Hex color (#RRGGBB or #RGB) or a named color.",
+            "type": "string"
+          },
+          "maxItems": 256,
+          "minItems": 1,
+          "type": "array"
+        }
+      },
+      "required": [
+        "palette"
+      ],
+      "type": "object"
+    }
+  ],
+  "description": "Reduce the image to a palette before it reaches the panel: exactly one of colors (2–256, built from the image) or palette (1–256 hex or named colors), plus dither. Transparent pixels stay unlit and are not counted. The preview shows the finished frame."
+}

changedInput schema / properties / source / description

Previous value: -"Absolute local file path or https (not http) URL of the image to display."New value: +"Absolute local file path or https (not http) URL of the image to display; a relative path is rejected. An animated GIF or WebP, whatever its file name, pushes as an animation."

addedInput schema / properties / speed

Added value: +{
+  "description": "Milliseconds per frame for an animated source (10–2000). Default: the source's total duration over the pushed frame count, or 150 when it records no delays. A still ignores it.",
+  "maximum": 2000,
+  "minimum": 10,
+  "type": "integer"
+}

changedOutput schema / anyOf

Previous value: -[
-  {
-    "not": {
-      "required": [
-        "error"
-      ]
-    },
-    "required": [
-      "pushed"
-    ]
-  },
-  {
-    "required": [
-      "error"
-    ]
-  }
-]New value: +[
+  {
+    "not": {
+      "required": [
+        "error"
+      ]
+    },
+    "required": [
+      "pushed",
+      "frames",
+      "sourceFrames"
+    ]
+  },
+  {
+    "required": [
+      "error"
+    ]
+  }
+]

changedOutput schema / properties / error / properties / data / properties / reason / description

Previous value: -"Machine-readable failure mode. Declared by this tool: `device_unreachable`: Device is not reachable. `device_http_error`: The device answered with a non-2xx HTTP status (retryable for 408, 429, 500, and 502–504). `device_rejected`: Device firmware returned a non-zero error code. `no_device_configured`: PIXOO_IP is not set. `asset_not_found`: Image path or URL could not be read. Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `device_unreachable`: Device is not reachable. `device_http_error`: The device answered with a non-2xx HTTP status (retryable for 408, 429, 500, and 502–504). `device_rejected`: Device firmware returned a non-zero error code. `no_device_configured`: PIXOO_IP is not set. `asset_not_found`: Image path or URL could not be read. `invalid_image`: The source was read but did not decode as an image. `invalid_color`: A finish palette entry could not be resolved to a color. Other values are possible when a failure originates below the handler."

changedOutput schema / properties / error / properties / data / properties / reason / examples

Previous value: -[
-  "device_unreachable",
-  "device_http_error",
-  "device_rejected",
-  "no_device_configured",
-  "asset_not_found"
-]New value: +[
+  "device_unreachable",
+  "device_http_error",
+  "device_rejected",
+  "no_device_configured",
+  "asset_not_found",
+  "invalid_image",
+  "invalid_color"
+]

addedOutput schema / properties / frames

Added value: +{
+  "description": "Frames rendered and pushed: 1 for a still, 2–40 for an animation.",
+  "type": "number"
+}

changedOutput schema / properties / outputFiles / description

Previous value: -"Absolute paths to saved PNG preview files. Present only when PIXOO_OUTPUT_DIR is configured."New value: +"Absolute paths to saved preview files: a PNG for a still, a GIF at the pushed speed for an animation. Present only when PIXOO_OUTPUT_DIR is configured."

addedOutput schema / properties / sourceFrames

Added value: +{
+  "description": "Frames in the source before sampling down to 40: 1 for a still.",
+  "type": "number"
+}

addedOutput schema / properties / speed

Added value: +{
+  "description": "Milliseconds per frame the animation plays at. Absent for a still.",
+  "type": "number"
+}

Changed2 schema fields changedv1.2.0Sep 25, 2026

changedOutput schema / properties / error / properties / data / properties / reason / description

Previous value: -"Machine-readable failure mode. Declared by this tool: `device_unreachable`: Device is not reachable. `device_rejected`: Device firmware returned a non-zero error code. `no_device_configured`: PIXOO_IP is not set. `asset_not_found`: Image path or URL could not be read. Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `device_unreachable`: Device is not reachable. `device_http_error`: The device answered with a non-2xx HTTP status (retryable for 408, 429, 500, and 502–504). `device_rejected`: Device firmware returned a non-zero error code. `no_device_configured`: PIXOO_IP is not set. `asset_not_found`: Image path or URL could not be read. Other values are possible when a failure originates below the handler."

changedOutput schema / properties / error / properties / data / properties / reason / examples

Previous value: -[
-  "device_unreachable",
-  "device_rejected",
-  "no_device_configured",
-  "asset_not_found"
-]New value: +[
+  "device_unreachable",
+  "device_http_error",
+  "device_rejected",
+  "no_device_configured",
+  "asset_not_found"
+]

Changed8 schema fields changedv1.1.1Aug 24, 2026

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

addedInput schema / additionalProperties
```
Added value: +false
```

changedOutput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

addedOutput schema / anyOf

Added value: +[
+  {
+    "not": {
+      "required": [
+        "error"
+      ]
+    },
+    "required": [
+      "pushed"
+    ]
+  },
+  {
+    "required": [
+      "error"
+    ]
+  }
+]

addedOutput schema / properties / error

Added value: +{
+  "additionalProperties": {},
+  "description": "Present when the call failed. Absent on success.",
+  "properties": {
+    "code": {
+      "description": "JSON-RPC error code for this failure.",
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "data": {
+      "additionalProperties": {},
+      "properties": {
+        "reason": {
+          "description": "Machine-readable failure mode. Declared by this tool: `device_unreachable`: Device is not reachable. `device_rejected`: Device firmware returned a non-zero error code. `no_device_configured`: PIXOO_IP is not set. `asset_not_found`: Image path or URL could not be read. Other values are possible when a failure originates below the handler.",
+          "examples": [
+            "device_unreachable",
+            "device_rejected",
+            "no_device_configured",
+            "asset_not_found"
+          ],
+          "type": "string"
+        },
+        "recovery": {
+          "additionalProperties": {},
+          "description": "Actionable next step for the caller.",
+          "properties": {
+            "hint": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "hint"
+          ],
+          "type": "object"
+        },
+        "retryable": {
+          "description": "Whether retrying may succeed.",
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    },
+    "message": {
+      "description": "Human-readable description of what went wrong.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "code",
+    "message"
+  ],
+  "type": "object"
+}

removedOutput schema / properties / previewData

Removed value: -{
-  "description": "Base64-encoded PNG preview of the downsampled 64×64 result (8× upscaled, 512px).",
-  "type": "string"
-}

removedOutput schema / properties / previewMimeType

Removed value: -{
-  "description": "MIME type of the preview image.",
-  "enum": [
-    "image/png"
-  ],
-  "type": "string"
-}

removedOutput schema / required
```
Removed value: -[
-  "pushed"
-]
```

First observedv1.0.0Jun 17, 2026

TDQS

A4.2/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations only cover openWorldHint/idempotentHint/destructiveHint=false; the description adds substantial behavior: GIF/WebP animation handling up to 40 frames with even sampling, loop-length-preserving speed, the returned downsampled preview content block (grid of frames for animations), and palette/dither effects. That is rich context beyond structured fields.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Four sentences, front-loaded with the core action and source forms, then progressively adding animation, return, kernel and finish details. Dense and mostly waste-free, though somewhat long for a definition whose schema already carries much of the detail.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with 6 parameters, full schema coverage, nested anyOf finish, and an output schema, the description still covers the hard-to-infer parts: animation frame sampling and speed defaults, preview return shape, and palette-dither tradeoffs. Nothing an agent needs to invoke it correctly appears missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so every parameter (fit, push, speed, finish, kernel, source) is already documented with enums, ranges and defaults. The description mostly restates the same facts (kernel choice, finish semantics) rather than adding syntax or format detail the schema lacks, so baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States specific verbs and resource: load an image, resize to the LED grid, optionally push, with the accepted source forms (absolute path or https URL). It is clearly distinguishable from siblings like pixoo_display_text or pixoo_compose_scene, which do not take image sources.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives implied usage guidance embedded in behavioral notes ('nearest-neighbor kernel preserves pixel art; use lanczos3 or mitchell for photos'), which helps pick the kernel. However it never states when to use this tool versus alternatives like pixoo_compose_scene or pixoo_overlay_text, nor any prerequisites beyond the push default.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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