fix(core): expose inline media source paths

packages/core/src/session/runner/to-llm-message.ts

@@ -2,6 +2,7 @@ import { Message, ToolCallPart, ToolResultPart, type ContentPart, type ProviderM
 import type { Model } from "@opencode-ai/schema/model"
 import { Option, Schema } from "effect"
 import { fileURLToPath } from "url"
+import path from "path"
 import { SessionMessage } from "../message.js"
 import type { FileAttachment } from "@opencode-ai/schema/prompt"
 
@@ -16,7 +17,10 @@ const media = (file: FileAttachment): ContentPart => ({
 })
 
 const attachmentLocation = (file: FileAttachment) => {
-  if (file.source.type !== "uri") return undefined
+  if (file.source.type === "inline") {
+    if (!file.name) return undefined
+    return path.posix.isAbsolute(file.name) || path.win32.isAbsolute(file.name) ? file.name : undefined
+  }
   const url = URL.parse(file.source.uri)
   if (url?.protocol !== "file:") return undefined
   try {

packages/core/test/session-runner-message.test.ts

@@ -491,6 +491,29 @@ Recent work
     ])
   })
 
+  test("exposes desktop media source paths retained on inline attachments", () => {
+    const data = Base64.make("AAECAw==")
+    const location = "/Users/vogel/Downloads/preview.gif"
+    const messages = toLLMMessages(
+      [
+        SessionMessage.User.make({
+          id: id("user-inline-image-path"),
+          type: "user",
+          text: "Add this GIF to the page",
+          files: [FileAttachment.make({ data, mime: "image/gif", source: { type: "inline" }, name: location })],
+          time: { created },
+        }),
+      ],
+      model,
+    )
+
+    expect(messages[0]?.content).toEqual([
+      { type: "text", text: "Add this GIF to the page" },
+      { type: "text", text: `Attached file: ${location}` },
+      { type: "media", mediaType: "image/gif", data, filename: location },
+    ])
+  })
+
   test("falls back to attachment names for invalid local source paths", () => {
     const data = Base64.make("AAECAw==")
     const messages = toLLMMessages(