From 1785313f3bada195d9d3f2d758fc02ff1f82f5fc Mon Sep 17 00:00:00 2001
From: YeonGyu-Kim <code.yeon.gyu@gmail.com>
Date: Tue, 24 Feb 2026 18:21:05 +0900
Subject: [PATCH] fix(hashline-read-enhancer): skip hashifying
 OpenCode-truncated lines

---
 src/hooks/hashline-read-enhancer/hook.ts      |  4 +++
 .../hashline-read-enhancer/index.test.ts      | 27 +++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/src/hooks/hashline-read-enhancer/hook.ts b/src/hooks/hashline-read-enhancer/hook.ts
index 8d0b2a5b4..652c000f5 100644
--- a/src/hooks/hashline-read-enhancer/hook.ts
+++ b/src/hooks/hashline-read-enhancer/hook.ts
@@ -13,6 +13,7 @@ const CONTENT_OPEN_TAG = "<content>"
 const CONTENT_CLOSE_TAG = "</content>"
 const FILE_OPEN_TAG = "<file>"
 const FILE_CLOSE_TAG = "</file>"
+const OPENCODE_LINE_TRUNCATION_SUFFIX = "... (line truncated to 2000 chars)"
 
 function isReadTool(toolName: string): boolean {
   return toolName.toLowerCase() === "read"
@@ -56,6 +57,9 @@ function transformLine(line: string): string {
   if (!parsed) {
     return line
   }
+  if (parsed.content.endsWith(OPENCODE_LINE_TRUNCATION_SUFFIX)) {
+    return line
+  }
   const hash = computeLineHash(parsed.lineNumber, parsed.content)
   return `${parsed.lineNumber}#${hash}|${parsed.content}`
 }
diff --git a/src/hooks/hashline-read-enhancer/index.test.ts b/src/hooks/hashline-read-enhancer/index.test.ts
index 0a3f29df9..dcab65bc9 100644
--- a/src/hooks/hashline-read-enhancer/index.test.ts
+++ b/src/hooks/hashline-read-enhancer/index.test.ts
@@ -84,6 +84,33 @@ describe("hashline-read-enhancer", () => {
     expect(lines[7]).toBe("</content>")
   })
 
+  it("keeps OpenCode-truncated lines unhashed while hashifying normal lines", async () => {
+    //#given
+    const hook = createHashlineReadEnhancerHook(mockCtx(), { hashline_edit: { enabled: true } })
+    const input = { tool: "read", sessionID: "s", callID: "c" }
+    const truncatedLine = `${"x".repeat(60)}... (line truncated to 2000 chars)`
+    const output = {
+      title: "demo.ts",
+      output: [
+        "<path>/tmp/demo.ts</path>",
+        "<type>file</type>",
+        "<content>",
+        `1: ${truncatedLine}`,
+        "2: normal line",
+        "</content>",
+      ].join("\n"),
+      metadata: {},
+    }
+
+    //#when
+    await hook["tool.execute.after"](input, output)
+
+    //#then
+    const lines = output.output.split("\n")
+    expect(lines[3]).toBe(`1: ${truncatedLine}`)
+    expect(lines[4]).toMatch(/^2#[ZPMQVRWSNKTXJBYH]{2}\|normal line$/)
+  })
+
   it("hashifies plain read output without content tags", async () => {
     //#given
     const hook = createHashlineReadEnhancerHook(mockCtx(), { hashline_edit: { enabled: true } })