diff --git a/codex-rs/memory/src/factory.rs b/codex-rs/memory/src/factory.rs
index c44b1a5843a..713c9156d1d 100644
--- a/codex-rs/memory/src/factory.rs
+++ b/codex-rs/memory/src/factory.rs
@@ -35,10 +35,10 @@ pub fn open_repo_store(
     let be = backend.unwrap_or_else(choose_backend_from_env);
     Ok(match be {
         Backend::Jsonl => {
-            let _path = std::env::var("CODEX_MEMORY_REPO_JSONL")
+            let path = std::env::var("CODEX_MEMORY_REPO_JSONL")
                 .map(std::path::PathBuf::from)
                 .unwrap_or_else(|_| base.join("memory.jsonl"));
-            Box::new(JsonlMemoryStore)
+            Box::new(JsonlMemoryStore::new(path))
         }
         #[cfg(feature = "sqlite")]
         Backend::Sqlite => {
@@ -62,10 +62,10 @@ pub fn open_global_store(
     let be = backend.unwrap_or_else(choose_backend_from_env);
     Ok(match be {
         Backend::Jsonl => {
-            let _path = std::env::var("CODEX_MEMORY_HOME_JSONL")
+            let path = std::env::var("CODEX_MEMORY_HOME_JSONL")
                 .map(std::path::PathBuf::from)
                 .unwrap_or_else(|_| base.join("memory.jsonl"));
-            Box::new(JsonlMemoryStore)
+            Box::new(JsonlMemoryStore::new(path))
         }
         #[cfg(feature = "sqlite")]
         Backend::Sqlite => {
@@ -76,3 +76,28 @@ pub fn open_global_store(
         }
     })
 }
+
+/// Rewrite a JSONL file, stripping invalid or empty lines.
+pub fn compact(path: &std::path::Path) -> anyhow::Result<()> {
+    let data = match std::fs::read_to_string(path) {
+        Ok(s) => s,
+        Err(e) if e.kind() == std::io::ErrorKind::NotFound => return Ok(()),
+        Err(e) => return Err(e.into()),
+    };
+    let mut out = String::new();
+    for line in data.lines() {
+        let line = line.trim();
+        if line.is_empty() {
+            continue;
+        }
+        if let Ok(v) = serde_json::from_str::<serde_json::Value>(line) {
+            out.push_str(&serde_json::to_string(&v)?);
+            out.push('\n');
+        }
+    }
+    if let Some(dir) = path.parent() {
+        std::fs::create_dir_all(dir)?;
+    }
+    std::fs::write(path, out)?;
+    Ok(())
+}
diff --git a/codex-rs/memory/src/store/jsonl.rs b/codex-rs/memory/src/store/jsonl.rs
index 09976c7de15..fdc7bb69a51 100644
--- a/codex-rs/memory/src/store/jsonl.rs
+++ b/codex-rs/memory/src/store/jsonl.rs
@@ -1,37 +1,182 @@
 use super::*;
 
-pub struct JsonlMemoryStore;
+#[derive(Debug, Clone)]
+pub struct JsonlMemoryStore {
+    path: std::path::PathBuf,
+}
+
+impl JsonlMemoryStore {
+    pub fn new<P: Into<std::path::PathBuf>>(path: P) -> Self {
+        Self { path: path.into() }
+    }
+
+    fn read_all(&self) -> anyhow::Result<Vec<MemoryItem>> {
+        let data = match std::fs::read_to_string(&self.path) {
+            Ok(s) => s,
+            Err(e) if e.kind() == std::io::ErrorKind::NotFound => String::new(),
+            Err(e) => return Err(e.into()),
+        };
+        let mut items = Vec::new();
+        for line in data.lines() {
+            let line = line.trim();
+            if line.is_empty() {
+                continue;
+            }
+            match serde_json::from_str::<MemoryItem>(line) {
+                Ok(item) => items.push(item),
+                Err(_) => continue, // skip noisy lines
+            }
+        }
+        Ok(items)
+    }
+
+    fn write_all(&self, items: &[MemoryItem]) -> anyhow::Result<()> {
+        if let Some(dir) = self.path.parent() {
+            std::fs::create_dir_all(dir)?;
+        }
+        let mut out = String::new();
+        for it in items {
+            out.push_str(&serde_json::to_string(it)?);
+            out.push('\n');
+        }
+        std::fs::write(&self.path, out)?;
+        Ok(())
+    }
+}
 
 impl MemoryStore for JsonlMemoryStore {
-    fn add(&self, _item: MemoryItem) -> anyhow::Result<()> {
-        todo!()
+    fn add(&self, item: MemoryItem) -> anyhow::Result<()> {
+        if let Some(dir) = self.path.parent() {
+            std::fs::create_dir_all(dir)?;
+        }
+        let mut line = serde_json::to_string(&item)?;
+        line.push('\n');
+        use std::io::Write as _;
+        let mut f = std::fs::OpenOptions::new()
+            .create(true)
+            .append(true)
+            .open(&self.path)?;
+        f.write_all(line.as_bytes())?;
+        f.flush()?;
+        Ok(())
     }
-    fn update(&self, _item: &MemoryItem) -> anyhow::Result<()> {
-        todo!()
+
+    fn update(&self, item: &MemoryItem) -> anyhow::Result<()> {
+        let mut items = self.read_all()?;
+        for it in &mut items {
+            if it.id == item.id {
+                *it = item.clone();
+            }
+        }
+        self.write_all(&items)
     }
-    fn delete(&self, _id: &str) -> anyhow::Result<()> {
-        todo!()
+
+    fn delete(&self, id: &str) -> anyhow::Result<()> {
+        let items = self.read_all()?;
+        let items: Vec<_> = items.into_iter().filter(|i| i.id != id).collect();
+        self.write_all(&items)
     }
-    fn get(&self, _id: &str) -> anyhow::Result<Option<MemoryItem>> {
-        todo!()
+
+    fn get(&self, id: &str) -> anyhow::Result<Option<MemoryItem>> {
+        let items = self.read_all()?;
+        Ok(items.into_iter().find(|i| i.id == id))
     }
+
     fn list(
         &self,
-        _scope: Option<Scope>,
-        _status: Option<Status>,
+        scope: Option<Scope>,
+        status: Option<Status>,
     ) -> anyhow::Result<Vec<MemoryItem>> {
-        todo!()
+        let mut items = self.read_all()?;
+        if let Some(sc) = scope {
+            items.retain(|i| i.scope == sc);
+        }
+        if let Some(st) = status {
+            items.retain(|i| i.status == st);
+        }
+        items.sort_by(|a, b| b.updated_at.cmp(&a.updated_at));
+        Ok(items)
     }
-    fn archive(&self, _id: &str, _archived: bool) -> anyhow::Result<()> {
-        todo!()
+
+    fn archive(&self, id: &str, archived: bool) -> anyhow::Result<()> {
+        let mut items = self.read_all()?;
+        let st = if archived {
+            Status::Archived
+        } else {
+            Status::Active
+        };
+        let mut found = false;
+        for it in &mut items {
+            if it.id == id {
+                it.status = st.clone();
+                found = true;
+            }
+        }
+        if !found {
+            anyhow::bail!("archive: id not found: {id}");
+        }
+        self.write_all(&items)
     }
-    fn export(&self, _out: &mut dyn std::io::Write) -> anyhow::Result<()> {
-        todo!()
+
+    fn export(&self, out: &mut dyn std::io::Write) -> anyhow::Result<()> {
+        let items = self.list(None, None)?;
+        for it in items {
+            let line = serde_json::to_string(&it)?;
+            out.write_all(line.as_bytes())?;
+            out.write_all(b"\n")?;
+        }
+        Ok(())
     }
-    fn import(&self, _input: &mut dyn std::io::Read) -> anyhow::Result<usize> {
-        todo!()
+
+    fn import(&self, input: &mut dyn std::io::Read) -> anyhow::Result<usize> {
+        let mut data = String::new();
+        std::io::Read::read_to_string(input, &mut data)?;
+        let items = self.read_all()?;
+        let mut map: std::collections::HashMap<String, MemoryItem> =
+            items.into_iter().map(|i| (i.id.clone(), i)).collect();
+        let mut count = 0usize;
+        for line in data.lines() {
+            let line = line.trim();
+            if line.is_empty() {
+                continue;
+            }
+            match serde_json::from_str::<MemoryItem>(line) {
+                Ok(item) => {
+                    map.insert(item.id.clone(), item);
+                    count += 1;
+                }
+                Err(_) => continue,
+            }
+        }
+        let mut items: Vec<MemoryItem> = map.into_values().collect();
+        items.sort_by(|a, b| b.updated_at.cmp(&a.updated_at));
+        self.write_all(&items)?;
+        Ok(count)
     }
+
     fn stats(&self) -> anyhow::Result<serde_json::Value> {
-        todo!()
+        let items = self.read_all()?;
+        let total = items.len();
+        let active = items.iter().filter(|i| i.status == Status::Active).count();
+        let archived = items
+            .iter()
+            .filter(|i| i.status == Status::Archived)
+            .count();
+        let mut by_scope = serde_json::Map::new();
+        for sc in [Scope::Global, Scope::Repo, Scope::Dir] {
+            let n = items.iter().filter(|i| i.scope == sc).count();
+            let key = match sc {
+                Scope::Global => "global",
+                Scope::Repo => "repo",
+                Scope::Dir => "dir",
+            };
+            by_scope.insert(key.to_string(), serde_json::json!(n));
+        }
+        Ok(serde_json::json!({
+            "total": total,
+            "active": active,
+            "archived": archived,
+            "by_scope": serde_json::Value::Object(by_scope),
+        }))
     }
 }