Phase 1: Repository & Infrastructure Setup

- Renamed directories: codex-rs -> llmx-rs, codex-cli -> llmx-cli
- Updated package.json files:
  - Root: llmx-monorepo
  - CLI: @llmx/llmx
  - SDK: @llmx/llmx-sdk
- Updated pnpm workspace configuration
- Renamed binary: codex.js -> llmx.js
- Updated environment variables: CODEX_* -> LLMX_*
- Changed repository URLs to valknar/llmx

🤖 Generated with Claude Code

llmx-rs/core/src/tools/handlers/mcp.rs

@@ -0,0 +1,75 @@
+use async_trait::async_trait;
+
+use crate::function_tool::FunctionCallError;
+use crate::mcp_tool_call::handle_mcp_tool_call;
+use crate::tools::context::ToolInvocation;
+use crate::tools::context::ToolOutput;
+use crate::tools::context::ToolPayload;
+use crate::tools::registry::ToolHandler;
+use crate::tools::registry::ToolKind;
+
+pub struct McpHandler;
+
+#[async_trait]
+impl ToolHandler for McpHandler {
+    fn kind(&self) -> ToolKind {
+        ToolKind::Mcp
+    }
+
+    async fn handle(&self, invocation: ToolInvocation) -> Result<ToolOutput, FunctionCallError> {
+        let ToolInvocation {
+            session,
+            turn,
+            call_id,
+            payload,
+            ..
+        } = invocation;
+
+        let payload = match payload {
+            ToolPayload::Mcp {
+                server,
+                tool,
+                raw_arguments,
+            } => (server, tool, raw_arguments),
+            _ => {
+                return Err(FunctionCallError::RespondToModel(
+                    "mcp handler received unsupported payload".to_string(),
+                ));
+            }
+        };
+
+        let (server, tool, raw_arguments) = payload;
+        let arguments_str = raw_arguments;
+
+        let response = handle_mcp_tool_call(
+            session.as_ref(),
+            turn.as_ref(),
+            call_id.clone(),
+            server,
+            tool,
+            arguments_str,
+        )
+        .await;
+
+        match response {
+            codex_protocol::models::ResponseInputItem::McpToolCallOutput { result, .. } => {
+                Ok(ToolOutput::Mcp { result })
+            }
+            codex_protocol::models::ResponseInputItem::FunctionCallOutput { output, .. } => {
+                let codex_protocol::models::FunctionCallOutputPayload {
+                    content,
+                    content_items,
+                    success,
+                } = output;
+                Ok(ToolOutput::Function {
+                    content,
+                    content_items,
+                    success,
+                })
+            }
+            _ => Err(FunctionCallError::RespondToModel(
+                "mcp handler received unexpected response variant".to_string(),
+            )),
+        }
+    }
+}