feat(mcp): GET /mcp/servers/{id}/tools surfaces discovered tools

mateclaw-server/src/main/java/vip/mate/tool/mcp/controller/McpServerController.java

@@ -6,6 +6,7 @@ import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.*;
 import vip.mate.common.result.R;
 import vip.mate.tool.mcp.model.McpServerEntity;
+import vip.mate.tool.mcp.model.McpToolDescriptor;
 import vip.mate.tool.mcp.runtime.McpClientManager.ConnectionResult;
 import vip.mate.tool.mcp.service.McpServerService;
 
@@ -77,6 +78,21 @@ public class McpServerController {
         return R.ok(result);
     }
 
+    /**
+     * RFC-03 Lane A3 — list the tools surfaced by an MCP server (QwenPaw #2495).
+     *
+     * <p>Reads from the in-memory cache populated on connect/refresh, so the
+     * call is non-blocking and safe to poll from the admin UI. Returns an
+     * empty list when the server is configured but disconnected, in error
+     * state, or has no tools — never an error response in that case.
+     * 404 is reserved for "the server id doesn't exist".
+     */
+    @Operation(summary = "列出 MCP Server 已发现的工具")
+    @GetMapping("/{id}/tools")
+    public R<List<McpToolDescriptor>> listTools(@PathVariable Long id) {
+        return R.ok(mcpServerService.listToolsByServer(id));
+    }
+
     @Operation(summary = "刷新所有 MCP Server 连接")
     @PostMapping("/refresh")
     public R<Void> refresh() {

mateclaw-server/src/main/java/vip/mate/tool/mcp/model/McpToolDescriptor.java

@@ -0,0 +1,29 @@
+package vip.mate.tool.mcp.model;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+
+/**
+ * RFC-03 Lane A3 — DTO returned by {@code GET /api/v1/mcp/servers/{id}/tools}.
+ *
+ * <p>Mirrors the discovered subset of {@code io.modelcontextprotocol.spec.McpSchema.Tool}
+ * that the UI actually needs (name, description, params schema). Stays in
+ * {@code vip.mate.tool.mcp.model} so the public API doesn't leak the
+ * mcp-sdk transport types — those have evolved across SDK releases and
+ * we don't want every UI bump to track them.
+ *
+ * <p>{@code inputSchema} is left as a raw {@link Object} so Jackson
+ * serializes whatever JSON-Schema shape the server reported; consumers
+ * (UI, third-party clients) pass it straight through to JSON Schema
+ * renderers / validators.
+ *
+ * <p>{@link JsonInclude}{@code .NON_NULL} on the type keeps the wire
+ * payload tight when servers omit optional fields (description is
+ * optional in the MCP spec).
+ */
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public record McpToolDescriptor(
+        String name,
+        String description,
+        Object inputSchema
+) {
+}

mateclaw-server/src/main/java/vip/mate/tool/mcp/service/McpServerService.java

@@ -161,6 +161,31 @@ public class McpServerService {
         return testConnection(entity);
     }
 
+    /**
+     * RFC-03 Lane A3 — list the tools the given MCP server has surfaced
+     * to the runtime (fixes QwenPaw #2495).
+     *
+     * <p>Reads from {@link McpClientManager#getServerTools(Long)} which
+     * already caches the {@code listTools()} response on connect/refresh,
+     * so this is a constant-time lookup with no network roundtrip. The
+     * returned list is empty when the server is disconnected, in error
+     * state, or simply has no tools — never throws on those paths so the
+     * UI can render "no tools yet" rather than an error.
+     *
+     * <p>{@link #getById} is invoked first so a stale id (deleted server)
+     * still returns a 404 from the controller layer rather than silently
+     * "no tools".
+     */
+    public List<vip.mate.tool.mcp.model.McpToolDescriptor> listToolsByServer(Long id) {
+        getById(id); // throws if the server is gone — preserves 404 semantics
+        return mcpClientManager.getServerTools(id).stream()
+                .map(t -> new vip.mate.tool.mcp.model.McpToolDescriptor(
+                        t.name(),
+                        t.description(),
+                        t.inputSchema()))
+                .toList();
+    }
+
     /**
      * 刷新所有启用的 MCP server
      */