1 files changed, 59 insertions, 0 deletions
diff --git a/makima/src/daemon/process/claude_protocol.rs b/makima/src/daemon/process/claude_protocol.rs
new file mode 100644
index 0000000..96e5377
--- /dev/null
+++ b/makima/src/daemon/process/claude_protocol.rs
@@ -0,0 +1,59 @@
+//! Claude Code JSON protocol types for stdin communication.
+//!
+//! When using `--input-format=stream-json`, Claude Code expects
+//! newline-delimited JSON messages on stdin.
+
+use serde::Serialize;
+
+/// Message sent to Claude Code via stdin.
+///
+/// Format based on Claude Code's stream-json input protocol.
+#[derive(Debug, Clone, Serialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum ClaudeInputMessage {
+    /// A user message to send to Claude.
+    User { message: UserMessage },
+}
+
+/// The inner user message structure.
+#[derive(Debug, Clone, Serialize)]
+pub struct UserMessage {
+    /// Always "user" for user messages.
+    pub role: String,
+    /// The message content.
+    pub content: String,
+}
+
+impl ClaudeInputMessage {
+    /// Create a new user message.
+    pub fn user(content: impl Into<String>) -> Self {
+        Self::User {
+            message: UserMessage {
+                role: "user".to_string(),
+                content: content.into(),
+            },
+        }
+    }
+
+    /// Serialize to a JSON string with trailing newline (NDJSON format).
+    pub fn to_json_line(&self) -> Result<String, serde_json::Error> {
+        let mut json = serde_json::to_string(self)?;
+        json.push('\n');
+        Ok(json)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::daemon::*;
+
+    #[test]
+    fn test_user_message_serialization() {
+        let msg = ClaudeInputMessage::user("Hello, Claude!");
+        let json = msg.to_json_line().unwrap();
+
+        // Should produce: {"type":"user","message":{"role":"user","content":"Hello, Claude!"}}\n
+        assert!(json.starts_with(r#"{"type":"user","message":{"role":"user","content":"Hello, Claude!"}}"#));
+        assert!(json.ends_with('\n'));
+    }
+}