new: support MCP Protocol 2025_06_18 (#2044)

* chore: bump rust-mcp-sdk

* changelog

* changelog update

* fix: run just bump patch

Author: andrewpeters9

.yarn/versions/a3f51fd8.yml

@@ -0,0 +1,9 @@
+releases:
+  "@moonrepo/cli": patch
+  "@moonrepo/core-linux-arm64-gnu": patch
+  "@moonrepo/core-linux-arm64-musl": patch
+  "@moonrepo/core-linux-x64-gnu": patch
+  "@moonrepo/core-linux-x64-musl": patch
+  "@moonrepo/core-macos-arm64": patch
+  "@moonrepo/core-macos-x64": patch
+  "@moonrepo/core-windows-x64-msvc": patch

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+#### 🚀 Updates
+
+- Updated MCP (Model Context Protocol) implementation to use protocol version `2025-06-18` from `2025-03-26` - in turn, allowing Claude Code to use the MCP.
+
 ## 1.38.3
 
 #### 🐞 Fixes

Cargo.lock

@@ -19,10 +19,10 @@ moon_task = { version = "0.1.2", path = "../task" }
 moon_workspace_graph = { path = "../workspace-graph" }
 async-trait = { workspace = true }
 miette = { workspace = true }
-rust-mcp-sdk = { version = "0.4.5", default-features = false, features = [
+rust-mcp-sdk = { version = "0.5.0", default-features = false, features = [
 	"macros",
 	"server",
-	"2025_03_26",
+	"2025_06_18",
 ] }
 serde = { workspace = true }
 serde_json = { workspace = true }

crates/mcp/Cargo.toml

@@ -73,6 +73,7 @@ pub async fn run_mcp(
             name: "moon MCP Server".to_string(),
             version: env::var("MOON_VERSION")
                 .unwrap_or_else(|_| env!("CARGO_PKG_VERSION").to_string()),
+            title: Some("Moon MCP Server".to_string()),
         },
         capabilities: ServerCapabilities {
             tools: Some(ServerCapabilitiesTools { list_changed: None }),

crates/mcp/src/mcp.rs

@@ -8,7 +8,7 @@ use moon_app_context::AppContext;
 use moon_workspace_graph::WorkspaceGraph;
 use rust_mcp_sdk::{
     macros::{JsonSchema, mcp_tool},
-    schema::{CallToolResult, schema_utils::CallToolError},
+    schema::{CallToolResult, TextContent, schema_utils::CallToolError},
 };
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
@@ -70,14 +70,15 @@ impl SyncWorkspaceTool {
         .await
         .map_err(map_miette_error)?;
 
-        Ok(CallToolResult::text_content(
+        Ok(CallToolResult::text_content(vec![TextContent::new(
             serde_json::to_string_pretty(&SyncResponse {
                 actions,
                 synced: true,
             })
             .map_err(CallToolError::new)?,
             None,
-        ))
+            None,
+        )]))
     }
 }
 
@@ -124,13 +125,14 @@ impl SyncProjectsTool {
         .await
         .map_err(map_miette_error)?;
 
-        Ok(CallToolResult::text_content(
+        Ok(CallToolResult::text_content(vec![TextContent::new(
             serde_json::to_string_pretty(&SyncResponse {
                 actions,
                 synced: true,
             })
             .map_err(CallToolError::new)?,
             None,
-        ))
+            None,
+        )]))
     }
 }

crates/mcp/src/tools/action_tools.rs

@@ -5,7 +5,7 @@ use moon_project::Project;
 use moon_workspace_graph::WorkspaceGraph;
 use rust_mcp_sdk::{
     macros::{JsonSchema, mcp_tool},
-    schema::{CallToolResult, schema_utils::CallToolError},
+    schema::{CallToolResult, TextContent, schema_utils::CallToolError},
 };
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
@@ -42,14 +42,15 @@ impl GetProjectTool {
             }
         }
 
-        Ok(CallToolResult::text_content(
+        Ok(CallToolResult::text_content(vec![TextContent::new(
             serde_json::to_string_pretty(&GetProjectResponse {
                 project,
                 project_dependencies,
             })
             .map_err(CallToolError::new)?,
             None,
-        ))
+            None,
+        )]))
     }
 }
 
@@ -92,11 +93,12 @@ impl GetProjectsTool {
             projects = new_projects;
         }
 
-        Ok(CallToolResult::text_content(
+        Ok(CallToolResult::text_content(vec![TextContent::new(
             serde_json::to_string_pretty(&GetProjectsResponse { projects })
                 .map_err(CallToolError::new)?,
             None,
-        ))
+            None,
+        )]))
     }
 }
 

crates/mcp/src/tools/project_tools.rs

@@ -5,7 +5,7 @@ use moon_task::{Target, Task};
 use moon_workspace_graph::WorkspaceGraph;
 use rust_mcp_sdk::{
     macros::{JsonSchema, mcp_tool},
-    schema::{CallToolResult, schema_utils::CallToolError},
+    schema::{CallToolResult, TextContent, schema_utils::CallToolError},
 };
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
@@ -40,14 +40,15 @@ impl GetTaskTool {
             }
         }
 
-        Ok(CallToolResult::text_content(
+        Ok(CallToolResult::text_content(vec![TextContent::new(
             serde_json::to_string_pretty(&GetTaskResponse {
                 task,
                 task_dependencies,
             })
             .map_err(CallToolError::new)?,
             None,
-        ))
+            None,
+        )]))
     }
 }
 
@@ -82,11 +83,12 @@ impl GetTasksTool {
 
         tasks.sort_by(|a, d| a.target.cmp(&d.target));
 
-        Ok(CallToolResult::text_content(
+        Ok(CallToolResult::text_content(vec![TextContent::new(
             serde_json::to_string_pretty(&GetTasksResponse { tasks })
                 .map_err(CallToolError::new)?,
             None,
-        ))
+            None,
+        )]))
     }
 }
 

crates/mcp/src/tools/task_tools.rs

@@ -6,7 +6,7 @@ use moon_common::is_ci;
 use moon_common::path::WorkspaceRelativePathBuf;
 use rust_mcp_sdk::{
     macros::{JsonSchema, mcp_tool},
-    schema::{CallToolResult, schema_utils::CallToolError},
+    schema::{CallToolResult, TextContent, schema_utils::CallToolError},
 };
 use serde::{Deserialize, Serialize};
 
@@ -50,13 +50,14 @@ impl GetTouchedFiles {
                 .map_err(map_miette_error)?
         };
 
-        Ok(CallToolResult::text_content(
+        Ok(CallToolResult::text_content(vec![TextContent::new(
             serde_json::to_string_pretty(&GetTouchedFilesResponse {
                 files: touched_files.all().into_iter().cloned().collect(),
             })
             .map_err(CallToolError::new)?,
             None,
-        ))
+            None,
+        )]))
     }
 }