chore(tools): Exclude intent-to-add files from git_diff staged output

.config/jp/tools/src/git/diff.rs

@@ -41,8 +41,14 @@ fn git_diff_impl<R: ProcessRunner>(
     env: &[(&str, &str)],
 ) -> ToolResult {
     let mut args = match status {
-        DiffStatus::All => vec!["diff-index", "-p", "HEAD"],
-        DiffStatus::Staged => vec!["diff-index", "--cached", "-p", "HEAD"],
+        DiffStatus::All => vec!["diff-index", "--ita-invisible-in-index", "-p", "HEAD"],
+        DiffStatus::Staged => vec![
+            "diff-index",
+            "--cached",
+            "--ita-invisible-in-index",
+            "-p",
+            "HEAD",
+        ],
         DiffStatus::Unstaged => vec!["diff-files", "-p"],
     };
 

.config/jp/tools/tests/git_tests.rs

@@ -1169,6 +1169,37 @@ async fn diff_commit_no_match_for_path() {
     assert!(content.contains("No diff found"));
 }
 
+#[tokio::test]
+async fn staged_diff_excludes_intent_to_add_files() {
+    if !has_git() {
+        return;
+    }
+
+    let (_dir, root) = init_repo();
+
+    // Also stage a real change so we can verify the diff isn't just empty.
+    commit_then_modify(&root, "tracked.rs", "old\n", "new\n");
+    git(&root, &["add", "tracked.rs"]);
+
+    // Create an untracked file and mark it intent-to-add.
+    fs::write(root.join("ita.rs"), "intent to add content\n").unwrap();
+    git(&root, &["add", "--intent-to-add", "ita.rs"]);
+
+    let content = run_ok(ctx(&root), tool("git_diff", &json!({"status": "staged"}))).await;
+
+    // The real staged change must be present.
+    assert!(
+        content.contains("tracked.rs"),
+        "staged diff should contain the genuinely staged file"
+    );
+
+    // The intent-to-add file must NOT appear in staged output.
+    assert!(
+        !content.contains("ita.rs"),
+        "staged diff must not contain intent-to-add file, got: {content}"
+    );
+}
+
 #[tokio::test]
 async fn sequential_staging_across_tools() {
     if !has_git() {

.jp/config/personas/committer.toml

@@ -23,7 +23,7 @@ title.generate.auto = false
 tools.'*' = { enable = false, run = "unattended" }
 attachments = [
     "cmd:git branch --show-current?description=Current branch name",
-    "cmd:git diff-index --cached -p HEAD -- . :^crates/jp_llm/tests/fixtures :^Cargo.lock :^.jp/conversations?description=Diff of current cached/changed hunks (excluding test fixtures and Cargo.lock)",
+    "cmd:git diff-index --cached --ita-invisible-in-index -p HEAD -- . :^crates/jp_llm/tests/fixtures :^Cargo.lock :^.jp/conversations?description=Diff of current cached/changed hunks (excluding test fixtures and Cargo.lock)",
 ]
 
 [style]