feat: remove "Ai-assisted" trailer (#27)

It's noisy and I think unnecessary.

Author: alecthomas

README.md

@@ -11,11 +11,10 @@ It finds agents in four ways:
 
 Multiple agents can be attributed in a single commit. Results are deduplicated by email address.
 
-If any agents are found, it will append the following git trailers to the git commit:
+If any agents are found, it will append the following git trailer to the git commit:
 
 ```
 Co-authored-by: <email>
-Ai-assisted: true
 ```
 
 Emails are the official "agent" emails, where available, such as `Claude Code <noreply@anthropic.com>`.

src/git.rs

@@ -25,46 +25,34 @@ pub fn append_trailers(commit_msg_file: &PathBuf, agent: &Agent, debug: bool) ->
     let addr = Agent::extract_email_addr(agent.email);
     let content_lower = content.to_lowercase();
     let has_co_author = content_lower.contains("co-authored-by:") && content_lower.contains(&addr.to_lowercase());
-    let has_ai_assisted = content_lower.contains("ai-assisted: true");
 
-    if has_co_author && has_ai_assisted {
+    if has_co_author {
         if debug {
             eprintln!("\n=== Git Command ===");
-            eprintln!("Trailers already present, skipping git interpret-trailers");
+            eprintln!("Co-authored-by trailer already present, skipping git interpret-trailers");
         }
         return Ok(());
     }
 
-    let mut cmd = std::process::Command::new("git");
-    cmd.arg("interpret-trailers").arg("--in-place");
+    let co_authored = format!("Co-authored-by: {}", agent.email);
 
-    if !has_co_author {
-        let co_authored = format!("Co-authored-by: {}", agent.email);
-        if debug {
-            eprintln!("\n=== Git Command ===");
-            eprintln!(
-                "git interpret-trailers --in-place --trailer \"{}\" --if-exists addIfDifferent --trailer \"Ai-assisted: true\" \"{}\"",
-                co_authored,
-                commit_msg_file.display()
-            );
-        }
-        cmd.arg("--trailer")
-            .arg(&co_authored)
-            .arg("--if-exists")
-            .arg("addIfDifferent");
-    } else if debug {
+    if debug {
         eprintln!("\n=== Git Command ===");
         eprintln!(
-            "git interpret-trailers --in-place --trailer \"Ai-assisted: true\" \"{}\"",
+            "git interpret-trailers --in-place --trailer \"{}\" --if-exists addIfDifferent \"{}\"",
+            co_authored,
             commit_msg_file.display()
         );
     }
 
-    if !has_ai_assisted {
-        cmd.arg("--trailer").arg("Ai-assisted: true");
-    }
-
-    cmd.arg(commit_msg_file);
+    let mut cmd = std::process::Command::new("git");
+    cmd.arg("interpret-trailers")
+        .arg("--in-place")
+        .arg("--trailer")
+        .arg(&co_authored)
+        .arg("--if-exists")
+        .arg("addIfDifferent")
+        .arg(commit_msg_file);
 
     let output = cmd.output()?;
 

src/main.rs

@@ -265,10 +265,6 @@ mod tests {
             "Should not add duplicate trailer for same email address, found {} occurrences",
             co_author_count
         );
-        assert!(
-            content.contains("Ai-assisted: true"),
-            "Should still add Ai-assisted trailer even when co-authored-by already exists"
-        );
     }
 
     #[test]
@@ -294,11 +290,6 @@ mod tests {
             "Should not add duplicate trailer for same email address, found {} occurrences",
             co_author_count
         );
-        // But SHOULD have added Ai-assisted
-        assert!(
-            content.contains("Ai-assisted: true"),
-            "Should still add Ai-assisted trailer even when co-authored-by already exists"
-        );
     }
 
     #[test]
@@ -375,7 +366,6 @@ mod tests {
 
         let content = fs::read_to_string(file.path()).unwrap();
         assert!(content.contains("Co-authored-by: Claude Code <noreply@anthropic.com>"));
-        assert!(content.contains("Ai-assisted: true"));
     }
 
     #[test]
@@ -426,12 +416,5 @@ mod tests {
         let content = fs::read_to_string(file.path()).unwrap();
         assert!(content.contains("Co-authored-by: Claude Code <noreply@anthropic.com>"));
         assert!(content.contains("Co-authored-by: Amp <amp@ampcode.com>"));
-
-        let ai_assisted_count = content.matches("Ai-assisted: true").count();
-        assert_eq!(
-            ai_assisted_count, 1,
-            "Ai-assisted trailer should appear exactly once, found {} occurrences",
-            ai_assisted_count
-        );
     }
 }