feat: Add automatic image format conversion for HEIC/RAW/PSD files

Adds automatic conversion of unsupported image formats (HEIC, HEIF, RAW, PSD)
to JPEG before sending to multimodal-looker agent.

Changes:
- Add image-converter.ts module with format detection and conversion
- Modify look_at tool to auto-convert unsupported formats
- Extend mime-type-inference.ts to support 15+ additional formats
- Use sips (macOS) and ImageMagick (Linux/Windows) for conversion
- Add proper cleanup of temporary files

Fixes #722

Testing:
- All existing tests pass (29/29)
- TypeScript type checking passes
- Verified HEIC to JPEG conversion on macOS

src/tools/look-at/image-converter.ts

@@ -0,0 +1,114 @@
+import { execSync } from "node:child_process"
+import { existsSync, mkdtempSync, unlinkSync } from "node:fs"
+import { tmpdir } from "node:os"
+import { join } from "node:path"
+import { log } from "../../shared"
+
+const SUPPORTED_FORMATS = new Set([
+  "image/jpeg",
+  "image/png",
+  "image/webp",
+  "image/gif",
+  "image/bmp",
+  "image/tiff",
+])
+
+const UNSUPPORTED_FORMATS = new Set([
+  "image/heic",
+  "image/heif",
+  "image/x-canon-cr2",
+  "image/x-canon-crw",
+  "image/x-nikon-nef",
+  "image/x-nikon-nrw",
+  "image/x-sony-arw",
+  "image/x-sony-sr2",
+  "image/x-sony-srf",
+  "image/x-pentax-pef",
+  "image/x-olympus-orf",
+  "image/x-panasonic-raw",
+  "image/x-fuji-raf",
+  "image/x-adobe-dng",
+  "image/vnd.adobe.photoshop",
+  "image/x-photoshop",
+])
+
+export function needsConversion(mimeType: string): boolean {
+  if (SUPPORTED_FORMATS.has(mimeType)) {
+    return false
+  }
+  
+  if (UNSUPPORTED_FORMATS.has(mimeType)) {
+    return true
+  }
+  
+  return mimeType.startsWith("image/")
+}
+
+export function convertImageToJpeg(inputPath: string, mimeType: string): string {
+  if (!existsSync(inputPath)) {
+    throw new Error(`File not found: ${inputPath}`)
+  }
+
+  const tempDir = mkdtempSync(join(tmpdir(), "opencode-img-"))
+  const outputPath = join(tempDir, "converted.jpg")
+
+  log(`[image-converter] Converting ${mimeType} to JPEG: ${inputPath}`)
+
+  try {
+    if (process.platform === "darwin") {
+      try {
+        execSync(`sips -s format jpeg "${inputPath}" --out "${outputPath}"`, {
+          stdio: "pipe",
+          encoding: "utf-8",
+        })
+        
+        if (existsSync(outputPath)) {
+          log(`[image-converter] Converted using sips: ${outputPath}`)
+          return outputPath
+        }
+      } catch (sipsError) {
+        log(`[image-converter] sips failed: ${sipsError}`)
+      }
+    }
+
+    try {
+      execSync(`convert "${inputPath}" "${outputPath}"`, {
+        stdio: "pipe",
+        encoding: "utf-8",
+      })
+      
+      if (existsSync(outputPath)) {
+        log(`[image-converter] Converted using ImageMagick: ${outputPath}`)
+        return outputPath
+      }
+    } catch (convertError) {
+      log(`[image-converter] ImageMagick convert failed: ${convertError}`)
+    }
+
+    throw new Error(
+      `No image conversion tool available. Please install ImageMagick:\n` +
+      `  macOS: brew install imagemagick\n` +
+      `  Ubuntu/Debian: sudo apt install imagemagick\n` +
+      `  RHEL/CentOS: sudo yum install ImageMagick`
+    )
+  } catch (error) {
+    try {
+      if (existsSync(outputPath)) {
+        unlinkSync(outputPath)
+      }
+    } catch {}
+    
+    throw error
+  }
+}
+
+export function cleanupConvertedImage(filePath: string): void {
+  try {
+    if (existsSync(filePath)) {
+      unlinkSync(filePath)
+      log(`[image-converter] Cleaned up temporary file: ${filePath}`)
+    }
+  } catch (error) {
+    log(`[image-converter] Failed to cleanup ${filePath}: ${error}`)
+  }
+}

src/tools/look-at/mime-type-inference.ts

@@ -29,8 +29,25 @@ export function inferMimeTypeFromFilePath(filePath: string): string {
     ".jpeg": "image/jpeg",
     ".png": "image/png",
     ".webp": "image/webp",
+    ".gif": "image/gif",
+    ".bmp": "image/bmp",
+    ".tiff": "image/tiff",
+    ".tif": "image/tiff",
     ".heic": "image/heic",
     ".heif": "image/heif",
+    ".cr2": "image/x-canon-cr2",
+    ".crw": "image/x-canon-crw",
+    ".nef": "image/x-nikon-nef",
+    ".nrw": "image/x-nikon-nrw",
+    ".arw": "image/x-sony-arw",
+    ".sr2": "image/x-sony-sr2",
+    ".srf": "image/x-sony-srf",
+    ".pef": "image/x-pentax-pef",
+    ".orf": "image/x-olympus-orf",
+    ".raw": "image/x-panasonic-raw",
+    ".raf": "image/x-fuji-raf",
+    ".dng": "image/x-adobe-dng",
+    ".psd": "image/vnd.adobe.photoshop",
     ".mp4": "video/mp4",
     ".mpeg": "video/mpeg",
     ".mpg": "video/mpeg",

src/tools/look-at/tools.ts

@@ -13,6 +13,11 @@ import {
   inferMimeTypeFromFilePath,
 } from "./mime-type-inference"
 import { resolveMultimodalLookerAgentMetadata } from "./multimodal-agent-metadata"
+import {
+  needsConversion,
+  convertImageToJpeg,
+  cleanupConvertedImage,
+} from "./image-converter"
 
 export { normalizeArgs, validateArgs } from "./look-at-arguments"
 
@@ -41,8 +46,10 @@ export function createLookAt(ctx: PluginInput): ToolDefinition {
 
       let mimeType: string
       let filePart: { type: "file"; mime: string; url: string; filename: string }
+      let tempFilePath: string | null = null
 
-      if (imageData) {
+      try {
+        if (imageData) {
         mimeType = inferMimeTypeFromBase64(imageData)
         filePart = {
           type: "file",
@@ -52,11 +59,26 @@ export function createLookAt(ctx: PluginInput): ToolDefinition {
         }
       } else if (filePath) {
         mimeType = inferMimeTypeFromFilePath(filePath)
+        
+        let actualFilePath = filePath
+        if (needsConversion(mimeType)) {
+          log(`[look_at] Detected unsupported format: ${mimeType}, converting to JPEG...`)
+          try {
+            tempFilePath = convertImageToJpeg(filePath, mimeType)
+            actualFilePath = tempFilePath
+            mimeType = "image/jpeg"
+            log(`[look_at] Conversion successful: ${tempFilePath}`)
+          } catch (conversionError) {
+            log(`[look_at] Conversion failed: ${conversionError}`)
+            return `Error: Failed to convert image format. ${conversionError}`
+          }
+        }
+
         filePart = {
           type: "file",
           mime: mimeType,
-          url: pathToFileURL(filePath).href,
-          filename: basename(filePath),
+          url: pathToFileURL(actualFilePath).href,
+          filename: basename(actualFilePath),
         }
       } else {
         return "Error: Must provide either 'file_path' or 'image_data'."
@@ -149,8 +171,13 @@ Original error: ${createResult.error}`
         return "Error: No response from multimodal-looker agent"
       }
 
-      log(`[look_at] Got response, length: ${responseText.length}`)
-      return responseText
+        log(`[look_at] Got response, length: ${responseText.length}`)
+        return responseText
+      } finally {
+        if (tempFilePath) {
+          cleanupConvertedImage(tempFilePath)
+        }
+      }
     },
   })
 }