diff --git a/packages/opencode/src/kilocode/tool/notebook.ts b/packages/opencode/src/kilocode/tool/notebook.ts
index acf6463522c..4b254c790d6 100644
--- a/packages/opencode/src/kilocode/tool/notebook.ts
+++ b/packages/opencode/src/kilocode/tool/notebook.ts
@@ -28,16 +28,17 @@ const render = (kind: "markdown" | "code", text: string) => {
 export async function open(filepath: string): Promise<Readable | undefined> {
   if (path.extname(filepath).toLowerCase() !== ".ipynb") return undefined
 
-  const data = parse((await Encoding.read(filepath)).text)
-  if (!object(data) || !Array.isArray(data.cells)) return undefined
+  const raw = (await Encoding.read(filepath)).text
+  const data = parse(raw)
+  if (!object(data) || !Array.isArray(data.cells)) return Readable.from([raw])
 
   const cells: string[] = []
   for (const cell of data.cells) {
-    if (!object(cell)) return undefined
+    if (!object(cell)) continue
     if (cell.cell_type !== "markdown" && cell.cell_type !== "code") continue
 
     const text = source(cell.source)
-    if (text === undefined) return undefined
+    if (text === undefined) continue
     cells.push(render(cell.cell_type, text))
   }
 
diff --git a/packages/opencode/test/kilocode/read-notebook.test.ts b/packages/opencode/test/kilocode/read-notebook.test.ts
index b411e9ab66e..85e96023045 100644
--- a/packages/opencode/test/kilocode/read-notebook.test.ts
+++ b/packages/opencode/test/kilocode/read-notebook.test.ts
@@ -93,6 +93,27 @@ describe("kilocode notebook reads", () => {
     }),
   )
 
+  it.live("skips invalid cells without exposing raw notebook payloads", () =>
+    Effect.gen(function* () {
+      const dir = yield* tmpdirScoped()
+      const filepath = path.join(dir, "partial.ipynb")
+      const content = JSON.stringify({
+        cells: [
+          null,
+          { cell_type: "code", source: null, outputs: ["INVALID_OUTPUT_SHOULD_NOT_APPEAR"] },
+          { cell_type: "markdown", source: ["Readable cell"], metadata: { marker: "CELL_METADATA_SHOULD_NOT_APPEAR" } },
+        ],
+      })
+      yield* put(filepath, content)
+
+      const result = yield* run(dir, { filePath: filepath })
+
+      expect(result.output).toContain("Readable cell")
+      expect(result.output).not.toContain("INVALID_OUTPUT_SHOULD_NOT_APPEAR")
+      expect(result.output).not.toContain("CELL_METADATA_SHOULD_NOT_APPEAR")
+    }),
+  )
+
   it.live("applies read pagination to extracted cell text", () =>
     Effect.gen(function* () {
       const dir = yield* tmpdirScoped()