diff --git a/crates/spacesh-proto/src/event.rs b/crates/spacesh-proto/src/event.rs
new file mode 100644
index 0000000..0a1ca41
--- /dev/null
+++ b/crates/spacesh-proto/src/event.rs
@@ -0,0 +1,76 @@
+use serde::{Deserialize, Serialize};
+use crate::ids::{SurfaceId, WorkspaceId};
+
+/// The subset of activity that lands in the event log.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum EventKind {
+    Done,
+    Wait,
+    Error,
+    Exit,
+}
+
+/// One logged event. Workspace name and agent label are denormalized so the
+/// feed stays displayable after the surface or workspace is closed.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct EventRecord {
+    pub id: u64,
+    pub surface_id: SurfaceId,
+    pub workspace_id: WorkspaceId,
+    pub workspace_name: String,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub agent_label: Option<String>,
+    pub kind: EventKind,
+    pub ts: u64,
+    pub read: bool,
+}
+
+/// What a `mark_read` request targets.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(tag = "target", content = "value", rename_all = "snake_case")]
+pub enum MarkReadTarget {
+    All,
+    Ids(Vec<u64>),
+    Surface(SurfaceId),
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn event_kind_serializes_lowercase() {
+        assert_eq!(serde_json::to_string(&EventKind::Done).unwrap(), r#""done""#);
+        assert_eq!(serde_json::to_string(&EventKind::Exit).unwrap(), r#""exit""#);
+    }
+
+    #[test]
+    fn event_record_round_trips() {
+        let r = EventRecord {
+            id: 7,
+            surface_id: SurfaceId("s_1".into()),
+            workspace_id: WorkspaceId("w_1".into()),
+            workspace_name: "infra".into(),
+            agent_label: Some("claude".into()),
+            kind: EventKind::Error,
+            ts: 1_700_000_000_000,
+            read: false,
+        };
+        let back: EventRecord = serde_json::from_str(&serde_json::to_string(&r).unwrap()).unwrap();
+        assert_eq!(back, r);
+    }
+
+    #[test]
+    fn mark_read_target_variants_serialize() {
+        assert_eq!(serde_json::to_string(&MarkReadTarget::All).unwrap(), r#"{"target":"all"}"#);
+        assert_eq!(
+            serde_json::to_string(&MarkReadTarget::Ids(vec![1, 2])).unwrap(),
+            r#"{"target":"ids","value":[1,2]}"#
+        );
+        let s = MarkReadTarget::Surface(SurfaceId("s_9".into()));
+        assert_eq!(serde_json::to_string(&s).unwrap(), r#"{"target":"surface","value":"s_9"}"#);
+        let back: MarkReadTarget = serde_json::from_str(&serde_json::to_string(&s).unwrap()).unwrap();
+        assert_eq!(back, s);
+    }
+}
diff --git a/crates/spacesh-proto/src/lib.rs b/crates/spacesh-proto/src/lib.rs
index 987b410..addc79f 100644
--- a/crates/spacesh-proto/src/lib.rs
+++ b/crates/spacesh-proto/src/lib.rs
@@ -1,10 +1,12 @@
 pub mod codec;
+pub mod event;
 pub mod ids;
 pub mod layout;
 pub mod message;
 pub mod status;
 pub mod workspace;
 
+pub use event::{EventKind, EventRecord, MarkReadTarget};
 pub use ids::{GroupId, SurfaceId, WorkspaceId};
 pub use layout::{LayoutNode, Orient};
 pub use message::{Cmd, Envelope, ErrorBody, Evt};