diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2e05ce79..3474e30e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -69,6 +69,32 @@ jobs:
         working-directory: packages/client
         run: bun run check:generated
 
+  acp-content:
+    name: acp content
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Setup Node
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version: "24"
+
+      - name: Setup Bun
+        uses: ./.github/actions/setup-bun
+
+      - name: Run ACP content tests
+        timeout-minutes: 5
+        working-directory: packages/opencode
+        run: bun test test/acp/content.test.ts
+
   e2e:
     name: e2e (smoke)
     runs-on: ubuntu-latest
diff --git a/packages/opencode/src/acp/content.ts b/packages/opencode/src/acp/content.ts
index 9207dd7c..e87e1f48 100644
--- a/packages/opencode/src/acp/content.ts
+++ b/packages/opencode/src/acp/content.ts
@@ -28,92 +28,89 @@ export function promptContentToParts(content: readonly ContentBlock[]): PromptPa
 }
 
 export function contentBlockToParts(block: ContentBlock): PromptPart[] {
-  switch (block.type) {
-    case "text":
+  return handlers[block.type]?.(block as never) ?? []
+}
+
+function textBlockToParts(block: Extract<ContentBlock, { type: "text" }>): PromptPart[] {
+  return [
+    {
+      type: "text",
+      text: block.text,
+      ...audienceFlags(block.annotations?.audience ?? undefined),
+    },
+  ]
+}
+
+function imageBlockToParts(block: Extract<ContentBlock, { type: "image" }>): PromptPart[] {
+  const url = imageBlockUrl(block)
+  if (!url) return []
+  return [
+    {
+      type: "file",
+      url,
+      filename: filenameFromUri(block.uri ?? undefined) ?? "image",
+      mime: block.mimeType,
+    },
+  ]
+}
+
+function imageBlockUrl(block: Extract<ContentBlock, { type: "image" }>) {
+  if (block.data) return `data:${block.mimeType};base64,${block.data}`
+  if (block.uri?.startsWith("data:")) return block.uri
+  if (block.uri?.startsWith("http://") || block.uri?.startsWith("https://")) return block.uri
+}
+
+function resourceLinkBlockToParts(block: Extract<ContentBlock, { type: "resource_link" }>): PromptPart[] {
+  return [resourceLinkToPart(block)]
+}
+
+function resourceBlockToParts(block: Extract<ContentBlock, { type: "resource" }>): PromptPart[] {
+  if ("text" in block.resource) return resourceTextToParts(block.resource)
+  if (!block.resource.mimeType) return []
+  return resourceBlobToParts(block.resource.uri, block.resource.mimeType, block.resource.blob)
+}
+
+function resourceTextToParts(resource: { uri: string; text: string }): PromptPart[] {
+  try {
+    const parsed = new URL(resource.uri)
+    if (parsed.protocol === "file:") {
+      const line = parsed.hash.match(/^#L(\d+)/)?.[1]
+      let filepath: string
+      try {
+        filepath = fileURLToPath(parsed)
+      } catch {
+        filepath = decodeURIComponent(parsed.pathname)
+      }
+      if (path.sep === "\\") filepath = filepath.replace(/\\/g, "/")
       return [
         {
           type: "text",
-          text: block.text,
-          ...audienceFlags(block.annotations?.audience ?? undefined),
+          text: `[${filepath}${line ? `:${line}` : ""}]\n${resource.text}`,
         },
       ]
+    }
+  } catch {}
+  return [{ type: "text", text: `[${resource.uri}]\n${resource.text}` }]
+}
 
-    case "image":
-      if (block.data) {
-        return [
-          {
-            type: "file",
-            url: `data:${block.mimeType};base64,${block.data}`,
-            filename: filenameFromUri(block.uri ?? undefined) ?? "image",
-            mime: block.mimeType,
-          },
-        ]
-      }
-      if (block.uri?.startsWith("data:")) {
-        return [
-          {
-            type: "file",
-            url: block.uri,
-            filename: filenameFromUri(block.uri) ?? "image",
-            mime: block.mimeType,
-          },
-        ]
-      }
-      if (block.uri?.startsWith("http://") || block.uri?.startsWith("https://")) {
-        return [
-          {
-            type: "file",
-            url: block.uri,
-            filename: filenameFromUri(block.uri) ?? "image",
-            mime: block.mimeType,
-          },
-        ]
-      }
-      return []
-
-    case "resource_link":
-      return [resourceLinkToPart(block)]
-
-    case "resource":
-      if ("text" in block.resource) {
-        try {
-          const parsed = new URL(block.resource.uri)
-          if (parsed.protocol === "file:") {
-            const line = parsed.hash.match(/^#L(\d+)/)?.[1]
-            let filepath: string
-            try {
-              filepath = fileURLToPath(parsed)
-            } catch {
-              filepath = decodeURIComponent(parsed.pathname)
-            }
-            if (path.sep === "\\") filepath = filepath.replace(/\\/g, "/")
-            return [
-              {
-                type: "text",
-                text: `[${filepath}${line ? `:${line}` : ""}]\n${block.resource.text}`,
-              },
-            ]
-          }
-        } catch {}
-        return [{ type: "text", text: `[${block.resource.uri}]\n${block.resource.text}` }]
-      }
-      if (block.resource.mimeType) {
-        return [
-          {
-            type: "file",
-            url: block.resource.uri.startsWith("data:")
-              ? block.resource.uri
-              : `data:${block.resource.mimeType};base64,${block.resource.blob}`,
-            filename: filenameFromUri(block.resource.uri) ?? "file",
-            mime: block.resource.mimeType,
-          },
-        ]
-      }
-      return []
+function resourceBlobToParts(uri: string, mimeType: string, blob: string): PromptPart[] {
+  return [
+    {
+      type: "file",
+      url: uri.startsWith("data:") ? uri : `data:${mimeType};base64,${blob}`,
+      filename: filenameFromUri(uri) ?? "file",
+      mime: mimeType,
+    },
+  ]
+}
 
-    default:
-      return []
-  }
+const handlers: {
+  [K in ContentBlock["type"]]?: (block: Extract<ContentBlock, { type: K }>) => PromptPart[]
+} = {
+  text: textBlockToParts,
+  image: imageBlockToParts,
+  resource_link: resourceLinkBlockToParts,
+  resource: resourceBlockToParts,
 }
 
 export function partsToContentChunks(parts: readonly ReplayPart[]): ContentChunk[] {
diff --git a/packages/opencode/test/acp/content.test.ts b/packages/opencode/test/acp/content.test.ts
index ab5ffdb9..610dc367 100644
--- a/packages/opencode/test/acp/content.test.ts
+++ b/packages/opencode/test/acp/content.test.ts
@@ -64,6 +64,35 @@ describe("acp content conversion", () => {
     ])
   })
 
+  test("image block with data URI is preserved as a file part", () => {
+    expect(
+      contentBlockToParts({
+        type: "image",
+        data: "",
+        mimeType: "image/png",
+        uri: "data:image/png;base64,AAAA",
+      }),
+    ).toEqual([
+      {
+        type: "file",
+        url: "data:image/png;base64,AAAA",
+        filename: "image",
+        mime: "image/png",
+      },
+    ])
+  })
+
+  test("image block without data or http URI is ignored", () => {
+    expect(
+      contentBlockToParts({
+        type: "image",
+        data: "",
+        mimeType: "image/png",
+        uri: "file:///tmp/local.png",
+      }),
+    ).toEqual([])
+  })
+
   test("resource_link file URL becomes a file part with name and fallback mime", () => {
     expect(
       contentBlockToParts({
@@ -146,6 +175,29 @@ describe("acp content conversion", () => {
     }
   })
 
+  test("resource with text falls back when file URL cannot be converted", () => {
+    const result = contentBlockToParts({
+      type: "resource",
+      resource: {
+        uri: "file://hostname/tmp/context.txt",
+        text: "context",
+      },
+    })
+    expect(result).toEqual([{ type: "text", text: "[/tmp/context.txt]\ncontext" }])
+  })
+
+  test("resource with blob and no mimeType is ignored", () => {
+    expect(
+      contentBlockToParts({
+        type: "resource",
+        resource: {
+          uri: "file:///tmp/report.bin",
+          blob: "AA==",
+        },
+      }),
+    ).toEqual([])
+  })
+
   test("resource with blob and mimeType becomes a data URL file part", () => {
     expect(
       contentBlockToParts({