comfyui-mcp/dist/services/view-image.js

Local-first, agent-native control plane for ComfyUI — MCP server + autonomous sidebar agent that drives your live graph in natural language on ANY LLM: Claude/ChatGPT/Gemini on your subscription (no API key), free local models via Ollama (fully offline),

import { AssetRegistry } from "./asset-registry.js";
import { getOutputImage } from "./image-management.js";
const SUPPORTED_IMAGE_MIME_PREFIX = "image/";
/**
 * Fetch a registered asset's bytes and return them as an MCP image content
 * block so the agent can see the actual image. Throws on missing/expired
 * assets and on non-image mime types (audio/video are not viewable inline).
 */
export async function viewAssetImage(assetId) {
    const record = AssetRegistry.get(assetId);
    if (!record) {
        throw new Error(`No asset found for id "${assetId}". It may have expired or never been registered.`);
    }
    const validType = record.type === "output" || record.type === "input" || record.type === "temp";
    const fetchType = validType
        ? record.type
        : "output";
    const { base64, mimeType } = await getOutputImage(record.filename, fetchType, record.subfolder);
    if (!mimeType.startsWith(SUPPORTED_IMAGE_MIME_PREFIX)) {
        throw new Error(`Asset "${assetId}" is not an image (mime: ${mimeType}). get_image (action:"view") only supports PNG/JPEG/WebP.`);
    }
    return {
        content: [
            {
                type: "text",
                text: `Asset ${assetId} — ${record.filename} (${mimeType})`,
            },
            {
                type: "image",
                data: base64,
                mimeType,
            },
        ],
    };
}
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