first pass of merging in warp (doesn't build)

app/src/ai/mcp/logs.rs

@@ -1,8 +1,24 @@
-use simple_logger::manager::resolve_log_path;
 use std::path::PathBuf;
 
+use simple_logger::manager::resolve_log_path;
 use uuid::Uuid;
 
+/// Per-server MCP log rotation policy.
+///
+/// Caps each server's on-disk log footprint at `MCP_LOG_MAX_FILE_SIZE_BYTES *
+/// (1 + MCP_LOG_MAX_ROTATION)` — one active file plus the rotated tail. For
+/// the chosen values that's 10 MiB × 6 = 60 MiB per MCP server, which is far
+/// below the 20 GB single-server growth observed in #7723 and large enough to
+/// preserve a useful debugging window for a misbehaving server.
+///
+/// Gated to non-wasm: the only consumer is the native MCP manager, which is
+/// itself `#[cfg(not(target_family = "wasm"))]`, so these would be dead code
+/// on the wasm build.
+#[cfg(not(target_family = "wasm"))]
+const MCP_LOG_MAX_FILE_SIZE_BYTES: u64 = 10 * 1024 * 1024;
+#[cfg(not(target_family = "wasm"))]
+const MCP_LOG_MAX_ROTATION: usize = 5;
+
 pub fn relative_log_file_path_from_uuid(uuid: &Uuid) -> PathBuf {
     PathBuf::from(format!("{uuid}.log"))
 }
@@ -11,3 +27,12 @@ pub fn relative_log_file_path_from_uuid(uuid: &Uuid) -> PathBuf {
 pub fn log_file_path_from_uuid(uuid: &Uuid) -> PathBuf {
     resolve_log_path("mcp", relative_log_file_path_from_uuid(uuid))
 }
+
+/// Rotation policy applied to every MCP server log writer. Returns `None` only
+/// if a future change accidentally sets one of the cap constants to zero;
+/// callers can treat `None` as "rotation disabled" and the existing
+/// truncate-on-create behavior is preserved.
+#[cfg(not(target_family = "wasm"))]
+pub fn mcp_log_rotation_config() -> Option<simple_logger::RotationConfig> {
+    simple_logger::RotationConfig::new(MCP_LOG_MAX_FILE_SIZE_BYTES, MCP_LOG_MAX_ROTATION)
+}