From 0a9a0a0b1f234bd296459fc98b41fd6215c8e3a9 Mon Sep 17 00:00:00 2001
From: John Howard <john.howard@solo.io>
Date: Tue, 29 Jul 2025 20:08:31 -0700
Subject: [PATCH] fix(capabilities): do not serialize None as null for
 `list_changed` (#341)

The old form violates the spec, and all other `Option<bool>` fields also
behave this way. Concretely https://github.com/upstash/context7/ fails
without this change.
---
 crates/rmcp/src/model/capabilities.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/crates/rmcp/src/model/capabilities.rs b/crates/rmcp/src/model/capabilities.rs
index 3b9863c..581b8d8 100644
--- a/crates/rmcp/src/model/capabilities.rs
+++ b/crates/rmcp/src/model/capabilities.rs
@@ -36,6 +36,7 @@ pub struct ToolsCapability {
 #[serde(rename_all = "camelCase")]
 #[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
 pub struct RootsCapabilities {
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub list_changed: Option<bool>,
 }