diff --git a/crates/codeoid-protocol/src/session.rs b/crates/codeoid-protocol/src/session.rs
index 1384456..6a46180 100644
--- a/crates/codeoid-protocol/src/session.rs
+++ b/crates/codeoid-protocol/src/session.rs
@@ -162,6 +162,21 @@ pub struct CollaborationRole {
     /// to. Write authority is opt-in per role.
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub write: Option<bool>,
+    /// Goal-blackboard artifact kinds this role may READ — `spec`, `research`,
+    /// `adr`, `task-list`, `diff`, `findings`, or `extra/<key>`.
+    ///
+    /// `None` = the daemon's default profile for this role name; a role with no
+    /// profile and no declaration reads nothing. This is what makes reviewer
+    /// independence structural: `review` reads `diff`+`spec` and NOT
+    /// `research` or its peers' `findings`.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub reads: Option<Vec<String>>,
+    /// Artifact kinds this role may WRITE. `None` = the default profile for
+    /// this role name. A role writing a multi-writer kind (`findings`) writes
+    /// into its own slot, chosen daemon-side, so one reviewer can never
+    /// overwrite another's.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub writes: Option<Vec<String>>,
 }
 
 /// Set on a role-CHILD of a collaborative session: which collaboration it
diff --git a/crates/codeoid-protocol/tests/wire_format.rs b/crates/codeoid-protocol/tests/wire_format.rs
index e698fd6..699a40d 100644
--- a/crates/codeoid-protocol/tests/wire_format.rs
+++ b/crates/codeoid-protocol/tests/wire_format.rs
@@ -128,6 +128,8 @@ fn sample_session_info() -> SessionInfo {
                     count: None,
                     purpose: None,
                     write: None,
+                    reads: None,
+                    writes: None,
                 },
                 codeoid_protocol::CollaborationRole {
                     name: "review".into(),
@@ -136,6 +138,8 @@ fn sample_session_info() -> SessionInfo {
                     count: Some(3),
                     purpose: Some("independent critique".into()),
                     write: Some(false),
+                    reads: Some(vec!["spec".into(), "diff".into()]),
+                    writes: Some(vec!["findings".into()]),
                 },
             ],
         }),