diff --git a/crates/buzz-cli/src/commands/git_activity.rs b/crates/buzz-cli/src/commands/git_activity.rs
index 41901d0dd..1382f18f4 100644
--- a/crates/buzz-cli/src/commands/git_activity.rs
+++ b/crates/buzz-cli/src/commands/git_activity.rs
@@ -17,6 +17,7 @@ pub(crate) struct GitConversationContext {
 struct ActivityContext {
     channel_id: Uuid,
     source_message: EventId,
+    thread_root: EventId,
 }
 
 #[derive(Clone, Copy)]
@@ -41,15 +42,22 @@ impl GitEntityType {
 pub(crate) fn parse_git_conversation_context(
     channel: Option<&str>,
     source_message: Option<&str>,
+    thread_root: Option<&str>,
 ) -> Result<GitConversationContext, CliError> {
     if source_message.is_some() && channel.is_none() {
         return Err(CliError::Usage(
             "--source-message requires --channel".into(),
         ));
     }
+    if thread_root.is_some() && source_message.is_none() {
+        return Err(CliError::Usage(
+            "--thread-root requires --source-message".into(),
+        ));
+    }
 
     let channel_id = channel.map(parse_uuid).transpose()?;
     let source_event = source_message.map(parse_event_id).transpose()?;
+    let thread_root = thread_root.map(parse_event_id).transpose()?;
     let source_message = match (channel_id, source_event) {
         (Some(channel_id), Some(source_message)) => Some(GitSourceMessage {
             channel_id: channel_id.to_string(),
@@ -61,6 +69,7 @@ pub(crate) fn parse_git_conversation_context(
         (Some(channel_id), Some(source_message)) => Some(ActivityContext {
             channel_id,
             source_message,
+            thread_root: thread_root.unwrap_or(source_message),
         }),
         _ => None,
     };
@@ -116,7 +125,7 @@ fn build_activity_message(
     git_url: &str,
 ) -> Result<EventBuilder, CliError> {
     let thread_ref = ThreadRef {
-        root_event_id: context.source_message,
+        root_event_id: context.thread_root,
         parent_event_id: context.source_message,
     };
     let content = format!("Created [{}]({git_url})", markdown_link_label(title.trim()));
@@ -252,11 +261,18 @@ mod tests {
 
     #[test]
     fn source_message_requires_channel_and_valid_values() {
-        assert!(parse_git_conversation_context(None, Some(&"a".repeat(64))).is_err());
-        assert!(parse_git_conversation_context(Some("not-a-uuid"), None).is_err());
+        assert!(parse_git_conversation_context(None, Some(&"a".repeat(64)), None).is_err());
+        assert!(parse_git_conversation_context(Some("not-a-uuid"), None, None).is_err());
         assert!(parse_git_conversation_context(
             Some("11111111-1111-4111-8111-111111111111"),
-            Some("not-an-event")
+            None,
+            Some(&"c".repeat(64)),
+        )
+        .is_err());
+        assert!(parse_git_conversation_context(
+            Some("11111111-1111-4111-8111-111111111111"),
+            Some("not-an-event"),
+            None,
         )
         .is_err());
     }
@@ -267,6 +283,7 @@ mod tests {
         let context = ActivityContext {
             channel_id: Uuid::parse_str("11111111-1111-4111-8111-111111111111").expect("channel"),
             source_message: source,
+            thread_root: source,
         };
         let event = build_activity_message(
             &context,
@@ -291,4 +308,32 @@ mod tests {
             .iter()
             .any(|tag| { tag.as_slice() == ["e", &"b".repeat(64), "", "reply"] }));
     }
+
+    #[test]
+    fn activity_message_preserves_existing_thread_root() {
+        let source = parse_event_id(&"b".repeat(64)).expect("source event");
+        let root = parse_event_id(&"c".repeat(64)).expect("root event");
+        let context = ActivityContext {
+            channel_id: Uuid::parse_str("11111111-1111-4111-8111-111111111111").expect("channel"),
+            source_message: source,
+            thread_root: root,
+        };
+        let event = build_activity_message(
+            &context,
+            "Repository",
+            "buzz://git?repo=owner%3Arepo&type=repository",
+        )
+        .expect("activity builder")
+        .sign_with_keys(&Keys::generate())
+        .expect("signed activity");
+
+        assert!(event
+            .tags
+            .iter()
+            .any(|tag| tag.as_slice() == ["e", &"c".repeat(64), "", "root"]));
+        assert!(event
+            .tags
+            .iter()
+            .any(|tag| tag.as_slice() == ["e", &"b".repeat(64), "", "reply"]));
+    }
 }
diff --git a/crates/buzz-cli/src/commands/issues.rs b/crates/buzz-cli/src/commands/issues.rs
index 0b4ed7ffb..76c0f5edc 100644
--- a/crates/buzz-cli/src/commands/issues.rs
+++ b/crates/buzz-cli/src/commands/issues.rs
@@ -16,11 +16,12 @@ pub async fn cmd_create_issue(
     to: &[String],
     channel: Option<&str>,
     source_message: Option<&str>,
+    thread_root: Option<&str>,
 ) -> Result<(), CliError> {
     validate_hex64(repo_owner)?;
     validate_repo_id(repo_id)?;
     let body = read_or_stdin(content)?;
-    let context = parse_git_conversation_context(channel, source_message)?;
+    let context = parse_git_conversation_context(channel, source_message, thread_root)?;
 
     let meta = GitIssueMeta {
         labels: labels.to_vec(),
@@ -170,6 +171,7 @@ pub async fn dispatch(cmd: crate::IssuesCmd, client: &BuzzClient) -> Result<(),
             to,
             channel,
             source_message,
+            thread_root,
         } => {
             cmd_create_issue(
                 client,
@@ -181,6 +183,7 @@ pub async fn dispatch(cmd: crate::IssuesCmd, client: &BuzzClient) -> Result<(),
                 &to,
                 channel.as_deref(),
                 source_message.as_deref(),
+                thread_root.as_deref(),
             )
             .await
         }
diff --git a/crates/buzz-cli/src/commands/patches.rs b/crates/buzz-cli/src/commands/patches.rs
index cf5bc9e42..2481f133e 100644
--- a/crates/buzz-cli/src/commands/patches.rs
+++ b/crates/buzz-cli/src/commands/patches.rs
@@ -25,11 +25,12 @@ pub async fn cmd_send_patch(
     committer: Option<&str>,
     channel: Option<&str>,
     source_message: Option<&str>,
+    thread_root: Option<&str>,
 ) -> Result<(), CliError> {
     validate_hex64(repo_owner)?;
     validate_repo_id(repo_id)?;
     let content = read_file_or_stdin(patch)?;
-    let context = parse_git_conversation_context(channel, source_message)?;
+    let context = parse_git_conversation_context(channel, source_message, thread_root)?;
 
     let committer = match committer {
         Some(spec) => Some(parse_committer(spec)?),
@@ -244,6 +245,7 @@ pub async fn dispatch(cmd: crate::PatchesCmd, client: &BuzzClient) -> Result<(),
             committer,
             channel,
             source_message,
+            thread_root,
         } => {
             cmd_send_patch(
                 client,
@@ -261,6 +263,7 @@ pub async fn dispatch(cmd: crate::PatchesCmd, client: &BuzzClient) -> Result<(),
                 committer.as_deref(),
                 channel.as_deref(),
                 source_message.as_deref(),
+                thread_root.as_deref(),
             )
             .await
         }
diff --git a/crates/buzz-cli/src/commands/pr.rs b/crates/buzz-cli/src/commands/pr.rs
index 55c0d9d5b..73977ed14 100644
--- a/crates/buzz-cli/src/commands/pr.rs
+++ b/crates/buzz-cli/src/commands/pr.rs
@@ -36,12 +36,13 @@ pub async fn cmd_open_pr(
     to: &[String],
     channel: Option<&str>,
     source_message: Option<&str>,
+    thread_root: Option<&str>,
     revision_of: Option<&str>,
 ) -> Result<(), CliError> {
     validate_hex64(repo_owner)?;
     validate_repo_id(repo_id)?;
     let content = read_optional_body(body, body_file)?;
-    let context = parse_git_conversation_context(channel, source_message)?;
+    let context = parse_git_conversation_context(channel, source_message, thread_root)?;
 
     let repo = GitRepoCoord {
         owner: repo_owner.to_string(),
@@ -243,6 +244,7 @@ pub async fn dispatch(cmd: crate::PrCmd, client: &BuzzClient) -> Result<(), CliE
             to,
             channel,
             source_message,
+            thread_root,
             revision_of,
         } => {
             cmd_open_pr(
@@ -261,6 +263,7 @@ pub async fn dispatch(cmd: crate::PrCmd, client: &BuzzClient) -> Result<(), CliE
                 &to,
                 channel.as_deref(),
                 source_message.as_deref(),
+                thread_root.as_deref(),
                 revision_of.as_deref(),
             )
             .await
diff --git a/crates/buzz-cli/src/commands/repos.rs b/crates/buzz-cli/src/commands/repos.rs
index 19cf49f51..b8f6c480d 100644
--- a/crates/buzz-cli/src/commands/repos.rs
+++ b/crates/buzz-cli/src/commands/repos.rs
@@ -212,9 +212,10 @@ pub async fn cmd_create_repo(
     relays: &[String],
     channel: Option<&str>,
     source_message: Option<&str>,
+    thread_root: Option<&str>,
 ) -> Result<(), CliError> {
     validate_repo_id(repo_id)?;
-    let context = parse_git_conversation_context(channel, source_message)?;
+    let context = parse_git_conversation_context(channel, source_message, thread_root)?;
 
     let clone_refs: Vec<&str> = clone_urls.iter().map(|s| s.as_str()).collect();
     let relay_refs: Vec<&str> = relays.iter().map(|s| s.as_str()).collect();
@@ -378,6 +379,7 @@ pub async fn dispatch(cmd: crate::ReposCmd, client: &BuzzClient) -> Result<(), C
             relays,
             channel,
             source_message,
+            thread_root,
         } => {
             cmd_create_repo(
                 client,
@@ -389,6 +391,7 @@ pub async fn dispatch(cmd: crate::ReposCmd, client: &BuzzClient) -> Result<(), C
                 &relays,
                 channel.as_deref(),
                 source_message.as_deref(),
+                thread_root.as_deref(),
             )
             .await
         }
diff --git a/crates/buzz-cli/src/lib.rs b/crates/buzz-cli/src/lib.rs
index ad81bd236..58a800a70 100644
--- a/crates/buzz-cli/src/lib.rs
+++ b/crates/buzz-cli/src/lib.rs
@@ -1119,6 +1119,9 @@ pub enum ReposCmd {
         /// Triggering Buzz message event ID; requires --channel
         #[arg(long, requires = "channel")]
         source_message: Option<String>,
+        /// Original thread root when the triggering message is already a reply
+        #[arg(long, requires = "source_message")]
+        thread_root: Option<String>,
     },
     /// Get a repository announcement
     Get {
@@ -1244,6 +1247,9 @@ pub enum PatchesCmd {
         /// Triggering Buzz message event ID; requires --channel
         #[arg(long, requires = "channel")]
         source_message: Option<String>,
+        /// Original thread root when the triggering message is already a reply
+        #[arg(long, requires = "source_message")]
+        thread_root: Option<String>,
     },
     /// Get a patch by event id
     Get {
@@ -1356,6 +1362,9 @@ pub enum PrCmd {
         /// Triggering Buzz message event ID; requires --channel
         #[arg(long, requires = "channel")]
         source_message: Option<String>,
+        /// Original thread root when the triggering message is already a reply
+        #[arg(long, requires = "source_message")]
+        thread_root: Option<String>,
         /// Root patch event id this PR revises
         #[arg(long)]
         revision_of: Option<String>,
@@ -1482,6 +1491,9 @@ pub enum IssuesCmd {
         /// Triggering Buzz message event ID; requires --channel
         #[arg(long, requires = "channel")]
         source_message: Option<String>,
+        /// Original thread root when the triggering message is already a reply
+        #[arg(long, requires = "source_message")]
+        thread_root: Option<String>,
     },
     /// Get an issue by event id
     Get {
@@ -1894,6 +1906,22 @@ mod tests {
         }
     }
 
+    #[test]
+    fn git_thread_root_requires_source_message() {
+        let error = Cli::try_parse_from([
+            "buzz",
+            "repos",
+            "create",
+            "--id",
+            "repo",
+            "--thread-root",
+            &"a".repeat(64),
+        ])
+        .err()
+        .expect("--source-message must be required");
+        assert!(error.to_string().contains("--source-message"));
+    }
+
     #[test]
     fn command_inventory_is_stable() {
         let expected_groups: Vec<&str> = vec![
diff --git a/desktop/src-tauri/src/managed_agents/nest_skill.md b/desktop/src-tauri/src/managed_agents/nest_skill.md
index 1756cc569..d44a8f136 100644
--- a/desktop/src-tauri/src/managed_agents/nest_skill.md
+++ b/desktop/src-tauri/src/managed_agents/nest_skill.md
@@ -49,8 +49,10 @@ When a Buzz message triggers `repos create`, `issues create`, `pr open`, or
 `patches send`, always pass `--channel <current-channel-uuid>` from `[Context]`
 and `--source-message <triggering-event-id>` from `[Event]`. The CLI records
 the exact source backlink and replies with a clickable Git activity card. Do
-not ask for values already present in the event context. `pr open --channel`
-still works without `--source-message` when only an origin `h` tag is needed.
+not ask for values already present in the event context. When `[Context]` has
+`Scope: thread`, also pass its `Thread root` as `--thread-root <event-id>` so
+the card appears in the current thread. `pr open --channel` still works without
+`--source-message` when only an origin `h` tag is needed.
 
 Manage your repository's enforced branch and tag rules with `repos protect list|set|remove`. Ref patterns must use full Git names such as `refs/heads/main` or `refs/tags/*`; supported rules are `--push owner|admin|member`, `--no-force-push`, `--no-delete`, and `--require-patch`. `protect set` replaces the complete rule for that exact pattern, so omitted constraints are removed. Protection updates preserve every unrelated metadata tag and return exit code 5 when a newer NIP-33 head wins a concurrent write.