From b71ff0fcba4fe1be8ed0f814855cb42ecb68b5af Mon Sep 17 00:00:00 2001
From: Dale Seo <5466341+DaleSeo@users.noreply.github.com>
Date: Tue, 23 Jun 2026 18:56:51 -0400
Subject: [PATCH 1/2] chore: declare MSRV (rust-version = "1.88")

The workspace declared edition 2024 (which requires Rust >= 1.85) but had
no rust-version, leaving the MSRV implicit. Several dependencies in the
current lockfile (darling, jsonwebtoken, time) require rustc 1.88.0, so the
true floor is 1.88. Declare it on [workspace.package] and inherit it in the
published rmcp and rmcp-macros crates so downstream consumers get an explicit,
machine-readable MSRV.
---
 Cargo.toml                    | 1 +
 crates/rmcp-macros/Cargo.toml | 1 +
 crates/rmcp/Cargo.toml        | 1 +
 3 files changed, 3 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index 4a112a94e..4bd19ef42 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,7 @@ rmcp-macros = { version = "1.8.0", path = "./crates/rmcp-macros" }
 
 [workspace.package]
 edition = "2024"
+rust-version = "1.88"
 version = "1.8.0"
 authors = ["4t145 <u4t145@163.com>"]
 license = "Apache-2.0"
diff --git a/crates/rmcp-macros/Cargo.toml b/crates/rmcp-macros/Cargo.toml
index 6f645bdc7..db94afc8c 100644
--- a/crates/rmcp-macros/Cargo.toml
+++ b/crates/rmcp-macros/Cargo.toml
@@ -5,6 +5,7 @@ name = "rmcp-macros"
 license = { workspace = true }
 version = { workspace = true }
 edition = { workspace = true }
+rust-version = { workspace = true }
 repository = { workspace = true }
 homepage = { workspace = true }
 readme = { workspace = true }
diff --git a/crates/rmcp/Cargo.toml b/crates/rmcp/Cargo.toml
index 638679812..fc16e775a 100644
--- a/crates/rmcp/Cargo.toml
+++ b/crates/rmcp/Cargo.toml
@@ -3,6 +3,7 @@ name = "rmcp"
 license = { workspace = true }
 version = { workspace = true }
 edition = { workspace = true }
+rust-version = { workspace = true }
 repository = { workspace = true }
 homepage = { workspace = true }
 readme = { workspace = true }

From b05b34eede1b3e5f46a03f0b52b349069bb912c9 Mon Sep 17 00:00:00 2001
From: Dale Seo <5466341+DaleSeo@users.noreply.github.com>
Date: Tue, 23 Jun 2026 18:56:58 -0400
Subject: [PATCH 2/2] ci: add MSRV check job

Add an "MSRV Check" job that runs `cargo check` for rmcp (all features except
local) and rmcp-macros on the declared MSRV toolchain (1.88). Because the
in-repo rust-toolchain.toml pins a newer dev toolchain and would override the
installed toolchain for cargo, the job forces RUSTUP_TOOLCHAIN=1.88 so the
check actually runs on the MSRV rather than the pinned version.
---
 .github/workflows/ci.yml | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index eadd2794f..a1c084cfd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -112,6 +112,32 @@ jobs:
             --only-explicit-features \
             --features "$FEATURES"
 
+  msrv:
+    name: MSRV Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+
+      - name: Install Rust (MSRV)
+        uses: dtolnay/rust-toolchain@1.88
+
+      - uses: Swatinem/rust-cache@v2
+
+      # `rust-toolchain.toml` pins a newer dev toolchain and would otherwise
+      # override the toolchain installed above for in-repo `cargo` invocations.
+      # Forcing `RUSTUP_TOOLCHAIN` ensures the checks actually run on the MSRV.
+      - name: Check rmcp and rmcp-macros at MSRV
+        env:
+          RUSTUP_TOOLCHAIN: "1.88"
+        run: |
+          rustc --version
+          FEATURES=$(cargo metadata --no-deps --format-version 1 \
+            | jq -r '[.packages[] | select(.name == "rmcp") | .features | keys[]
+                      | select(startswith("__") | not)
+                      | select(. != "local")] | join(",")')
+          cargo check -p rmcp --features "$FEATURES"
+          cargo check -p rmcp-macros
+
   spelling:
     name: spell check with typos
     runs-on: ubuntu-latest