diff --git a/rust/crates/commands/src/lib.rs b/rust/crates/commands/src/lib.rs
index f08ae700..3f28dc0e 100644
--- a/rust/crates/commands/src/lib.rs
+++ b/rust/crates/commands/src/lib.rs
@@ -225,7 +225,7 @@ const SLASH_COMMAND_SPECS: &[SlashCommandSpec] = &[
         argument_hint: Some(
             "[list|exists <session-id>|switch <session-id>|fork [branch-name]|delete <session-id> [--force]]",
         ),
-        resume_supported: false,
+        resume_supported: true,
     },
     SlashCommandSpec {
         name: "plugin",
@@ -4596,16 +4596,16 @@ mod tests {
             }))
         );
         assert_eq!(
-            SlashCommand::parse("/session exists abc123"),
+            SlashCommand::parse("/session switch abc123"),
             Ok(Some(SlashCommand::Session {
-                action: Some("exists".to_string()),
+                action: Some("switch".to_string()),
                 target: Some("abc123".to_string())
             }))
         );
         assert_eq!(
-            SlashCommand::parse("/session switch abc123"),
+            SlashCommand::parse("/session exists abc123"),
             Ok(Some(SlashCommand::Session {
-                action: Some("switch".to_string()),
+                action: Some("exists".to_string()),
                 target: Some("abc123".to_string())
             }))
         );
diff --git a/rust/crates/rusty-claude-cli/src/main.rs b/rust/crates/rusty-claude-cli/src/main.rs
index d552b938..058ec0a9 100644
--- a/rust/crates/rusty-claude-cli/src/main.rs
+++ b/rust/crates/rusty-claude-cli/src/main.rs
@@ -4157,7 +4157,6 @@ fn run_resume_command(
         | SlashCommand::Resume { .. }
         | SlashCommand::Model { .. }
         | SlashCommand::Permissions { .. }
-        | SlashCommand::Session { .. }
         | SlashCommand::Login
         | SlashCommand::Logout
         | SlashCommand::Vim
@@ -6102,6 +6101,140 @@ fn confirm_session_deletion(session_id: &str) -> bool {
     matches!(answer.trim(), "y" | "Y" | "yes" | "Yes" | "YES")
 }
 
+fn session_details_json(sessions: &[ManagedSessionSummary]) -> Vec<serde_json::Value> {
+    sessions
+        .iter()
+        .map(|session| {
+            serde_json::json!({
+                "id": session.id,
+                "path": session.path.display().to_string(),
+                "message_count": session.message_count,
+                "updated_at_ms": session.updated_at_ms,
+                "modified_epoch_millis": session.modified_epoch_millis,
+                "parent_session_id": session.parent_session_id,
+                "branch_name": session.branch_name,
+                "lifecycle": session.lifecycle.json_value(),
+            })
+        })
+        .collect()
+}
+
+fn session_exists_json(
+    target: &str,
+    active_session_id: &str,
+) -> Result<serde_json::Value, Box<dyn std::error::Error>> {
+    let handle = create_managed_session_handle(target)?;
+    let resolved = resolve_session_reference(target).ok();
+    let exists = resolved.is_some();
+    let resolved_id = resolved
+        .as_ref()
+        .map(|handle| handle.id.as_str())
+        .unwrap_or(target);
+    Ok(serde_json::json!({
+        "kind": "session_exists",
+        "session_id": resolved_id,
+        "requested": target,
+        "exists": exists,
+        "active": resolved_id == active_session_id,
+        "path": resolved
+            .as_ref()
+            .map(|handle| handle.path.display().to_string()),
+        "candidate_path": handle.path.display().to_string(),
+    }))
+}
+
+fn run_resumed_session_command(
+    session_path: &Path,
+    session: &Session,
+    action: Option<&str>,
+    target: Option<&str>,
+) -> Result<ResumeCommandOutcome, Box<dyn std::error::Error>> {
+    match action {
+        None | Some("list") => {
+            let sessions = list_managed_sessions().unwrap_or_default();
+            let session_ids: Vec<String> = sessions.iter().map(|s| s.id.clone()).collect();
+            let active_id = session.session_id.clone();
+            let text = render_session_list(&active_id).unwrap_or_else(|e| format!("error: {e}"));
+            Ok(ResumeCommandOutcome {
+                session: session.clone(),
+                message: Some(text),
+                json: Some(serde_json::json!({
+                    "kind": "session_list",
+                    "sessions": session_ids,
+                    "session_details": session_details_json(&sessions),
+                    "active": active_id,
+                })),
+            })
+        }
+        Some("exists") => {
+            let Some(target) = target else {
+                return Err("/session exists requires a session id".into());
+            };
+            let value = session_exists_json(target, &session.session_id)?;
+            let exists = value
+                .get("exists")
+                .and_then(|v| v.as_bool())
+                .unwrap_or(false);
+            Ok(ResumeCommandOutcome {
+                session: session.clone(),
+                message: Some(format!(
+                    "Session exists\n  Session          {}\n  Exists           {}",
+                    target,
+                    if exists { "yes" } else { "no" }
+                )),
+                json: Some(value),
+            })
+        }
+        Some("delete") => {
+            let Some(target) = target else {
+                return Err("/session delete requires a session id".into());
+            };
+            Ok(ResumeCommandOutcome {
+                session: session.clone(),
+                message: Some(format!(
+                    "delete: confirmation required; rerun with /session delete {target} --force"
+                )),
+                json: Some(serde_json::json!({
+                    "kind": "error",
+                    "error": "confirmation required",
+                    "hint": format!("rerun with /session delete {target} --force"),
+                    "session_id": target,
+                })),
+            })
+        }
+        Some("delete-force") => {
+            let Some(target) = target else {
+                return Err("/session delete requires a session id".into());
+            };
+            let handle = resolve_session_reference(target)?;
+            if handle.id == session.session_id || handle.path == session_path {
+                return Err(format!(
+                    "delete: refusing to delete the active session '{}'. Resume or switch to another session first.",
+                    handle.id
+                )
+                .into());
+            }
+            delete_managed_session(&handle.path)?;
+            Ok(ResumeCommandOutcome {
+                session: session.clone(),
+                message: Some(format!(
+                    "Session deleted\n  Deleted session  {}\n  File             {}",
+                    handle.id,
+                    handle.path.display(),
+                )),
+                json: Some(serde_json::json!({
+                    "kind": "session_delete",
+                    "deleted": true,
+                    "session_id": handle.id,
+                    "path": handle.path.display().to_string(),
+                })),
+            })
+        }
+        Some("switch" | "fork") => Err("unsupported resumed slash command".into()),
+        Some(other) => Err(format!("unsupported resumed /session action: {other}").into()),
+    }
+}
+
 fn render_session_list(active_session_id: &str) -> Result<String, Box<dyn std::error::Error>> {
     let sessions = list_managed_sessions()?;
     let mut lines = vec![
@@ -13565,6 +13698,68 @@ UU conflicted.rs",
         std::fs::remove_dir_all(workspace).expect("workspace should clean up");
     }
 
+    #[test]
+    fn resumed_session_exists_and_delete_have_json_contracts() {
+        let _guard = cwd_guard();
+        let workspace = temp_workspace("resume-session-json-contracts");
+        std::fs::create_dir_all(&workspace).expect("workspace should create");
+        let previous = std::env::current_dir().expect("cwd");
+        std::env::set_current_dir(&workspace).expect("switch cwd");
+
+        let active = create_managed_session_handle("session-active").expect("active handle");
+        let active_session = Session::new()
+            .with_workspace_root(workspace.clone())
+            .with_persistence_path(active.path.clone());
+        active_session
+            .save_to_path(&active.path)
+            .expect("active session should save");
+        let saved = create_managed_session_handle("session-saved").expect("saved handle");
+        Session::new()
+            .with_workspace_root(workspace.clone())
+            .with_persistence_path(saved.path.clone())
+            .save_to_path(&saved.path)
+            .expect("saved session should save");
+
+        let exists_command = SlashCommand::parse("/session exists session-saved")
+            .expect("parse should succeed")
+            .expect("command should exist");
+        let exists = run_resume_command(&active.path, &active_session, &exists_command)
+            .expect("exists should run")
+            .json
+            .expect("exists should return json");
+        assert_eq!(exists["kind"], "session_exists");
+        assert_eq!(exists["session_id"], "session-saved");
+        assert_eq!(exists["exists"], true);
+        assert_eq!(exists["active"], false);
+        assert!(exists["path"].as_str().is_some());
+
+        let missing_command = SlashCommand::parse("/session exists missing-session")
+            .expect("parse should succeed")
+            .expect("command should exist");
+        let missing = run_resume_command(&active.path, &active_session, &missing_command)
+            .expect("missing exists should run")
+            .json
+            .expect("missing exists should return json");
+        assert_eq!(missing["kind"], "session_exists");
+        assert_eq!(missing["exists"], false);
+        assert_eq!(missing["session_id"], "missing-session");
+        assert!(missing["candidate_path"].as_str().is_some());
+
+        let delete_command = SlashCommand::parse("/session delete session-saved --force")
+            .expect("parse should succeed")
+            .expect("command should exist");
+        let deleted = run_resume_command(&active.path, &active_session, &delete_command)
+            .expect("delete should run")
+            .json
+            .expect("delete should return json");
+        assert_eq!(deleted["kind"], "session_delete");
+        assert_eq!(deleted["deleted"], true);
+        assert!(!saved.path.exists(), "saved session should be deleted");
+
+        std::env::set_current_dir(previous).expect("restore cwd");
+        std::fs::remove_dir_all(workspace).expect("workspace should clean up");
+    }
+
     #[test]
     fn latest_session_alias_resolves_most_recent_managed_session() {
         let _guard = cwd_guard();