diff --git a/mateclaw-server/src/main/java/vip/mate/agent/AgentGraphBuilder.java b/mateclaw-server/src/main/java/vip/mate/agent/AgentGraphBuilder.java
index 1339e4fe..dc4d9c06 100644
--- a/mateclaw-server/src/main/java/vip/mate/agent/AgentGraphBuilder.java
+++ b/mateclaw-server/src/main/java/vip/mate/agent/AgentGraphBuilder.java
@@ -453,9 +453,8 @@ public class AgentGraphBuilder {
             builtinSearchEnabled = true;
         }
         if (builtinSearchEnabled) {
-            // Phase 2: 不再移除 search 工具，改为在 prompt 中设定优先级引导
-            // 内置搜索作为首选，search 工具作为补充/兜底
-            log.info("内置搜索已开启 (provider={})，search 工具保留作为补充通道", provider.getProviderId());
+            // Provider-native search is independent of the scoped web_search callback.
+            log.info("模型原生搜索已开启 (provider={})，web_search 指导由最终工具范围决定", provider.getProviderId());
         }
         // Default 100 if DB row leaves max_iterations null. Negative or zero is an
         // explicit opt-in to "no soft cap" — ObservationDispatcher already treats
@@ -492,7 +491,9 @@ public class AgentGraphBuilder {
                     entity.getId(), basePromptTokens, prefixBudgetPlan.effectiveMaxTokens());
         }
 
-        String enhancedPrompt = buildEnhancedPrompt(entity, builtinSearchEnabled, prefixBudgetPlan.memoryTokens());
+        String enhancedPrompt = buildEnhancedPrompt(entity, builtinSearchEnabled, prefixBudgetPlan.memoryTokens(),
+                toolSet.callbacks().stream().map(callback -> callback.getToolDefinition().name())
+                        .collect(java.util.stream.Collectors.toSet()));
 
         // Runtime skill-catalog renderer — captures this agent's bound skills,
         // effective tool allowlist, model window and workspace; invoked each
@@ -1382,6 +1383,11 @@ public class AgentGraphBuilder {
     }
 
     private String buildEnhancedPrompt(AgentEntity entity, boolean builtinSearchEnabled, int memoryBudgetTokens) {
+        return buildEnhancedPrompt(entity, builtinSearchEnabled, memoryBudgetTokens, Set.of());
+    }
+
+    private String buildEnhancedPrompt(AgentEntity entity, boolean builtinSearchEnabled, int memoryBudgetTokens,
+                                       Set<String> availableToolNames) {
         // The agent's own systemPrompt encodes its identity (role / goal /
         // backstory). The memory block from workspace files (AGENTS.md, SOUL.md,
         // PROFILE.md, MEMORY.md, ...) augments that identity with durable
@@ -1538,27 +1544,41 @@ public class AgentGraphBuilder {
                 - These notifications appear at most once per event; if you miss one, it will not be repeated, so act on it in the turn you see it.
                 """.formatted(entity.getId());
 
-        // Web-search vs browser_use priority guidance — emitted unconditionally so the rule
-        // also reaches OpenAI-compatible / Anthropic / Gemini / DeepSeek / Ollama agents that
-        // do not have builtin search. Issue #40: without this rule the model treats
-        // browser_use as a search tool and gets stuck in a Playwright launch loop on Windows.
-        String searchGuidance = """
+        // Only recommend callbacks surviving the runtime deny/allow filters. Provider-native
+        // search is a separate capability and does not imply either callback is available.
+        boolean webSearchAvailable = availableToolNames.contains("web_search");
+        boolean browserAvailable = availableToolNames.contains("browser_use");
+        StringBuilder searchGuidance = new StringBuilder();
+        if (webSearchAvailable || browserAvailable || builtinSearchEnabled) {
+            searchGuidance.append("\n\n## Web Search Capability\n");
+        }
+        if (webSearchAvailable) {
+            searchGuidance.append("""
 
-                ## Web Search Capability
+                    - For plain web search or fetching public page content, call the `web_search` tool. It supports advanced parameters: `freshness` (day/week/month/year), `language` (zh-CN/en), `count` (1-10).
+                    - When searching for news, use the standard format: `📰 [Category] Title — Source | Time + Summary`, up to 5 results per category.
+                    """);
+        }
+        if (browserAvailable) {
+            // Issue #40: browser search can cause a Playwright launch loop on Windows.
+            searchGuidance.append("""
 
-                ### Tool Priority
-                - For plain web search or fetching public page content, call the `search` tool. It supports advanced parameters: `freshness` (day/week/month/year), `language` (zh-CN/en), `count` (1-10).
-                - Call `browser_use` ONLY when you need to interact with a page (click, fill forms, screenshot, run JS, follow a logged-in flow). Do NOT use `browser_use` as a search alternative.
-                - **NEVER** call both `browser_use` and `search` for the same query.
-                - When searching for news, use the standard format: `📰 [Category] Title — Source | Time + Summary`, up to 5 results per category.
-                """;
+                    - Call `browser_use` ONLY when you need to interact with a page (click, fill forms, screenshot, run JS, follow a logged-in flow). Do NOT use `browser_use` as a search alternative.
+                    """);
+        }
+        if (webSearchAvailable && browserAvailable) {
+            searchGuidance.append("\n- **NEVER** call both `browser_use` and `web_search` for the same query.\n");
+        }
         if (builtinSearchEnabled) {
-            searchGuidance += """
+            searchGuidance.append("""
 
-                ### Built-in Search (preferred when available)
-                Your responses automatically incorporate live web search results from the model provider. For most queries, answer directly — your reply already includes real-time search data. Do NOT say you cannot search.
-                Use the `search` tool ONLY when you need precise time filtering (e.g., "yesterday's news" → freshness=day), a specific language, or when built-in results feel insufficient.
-                """;
+                    ### Provider-native Search
+                    Search capability is enabled for the model provider. It may supply live web results when used; do not assume every response includes search results. Base claims about current information on results actually returned.
+                    When provider results are available and sufficient, use them directly.
+                    """);
+            if (webSearchAvailable) {
+                searchGuidance.append("Use `web_search` only when additional results are needed.\n");
+            }
         }
 
         // Wiki 知识库上下文注入。Share the same prefix budget as the memory
diff --git a/mateclaw-server/src/main/java/vip/mate/agent/binding/service/AgentBindingService.java b/mateclaw-server/src/main/java/vip/mate/agent/binding/service/AgentBindingService.java
index 8c030ee8..c8aba45c 100644
--- a/mateclaw-server/src/main/java/vip/mate/agent/binding/service/AgentBindingService.java
+++ b/mateclaw-server/src/main/java/vip/mate/agent/binding/service/AgentBindingService.java
@@ -506,13 +506,16 @@ public class AgentBindingService implements AgentBindingResolver {
      * <p>Auto-included on every non-null result, in addition to the bound
      * tools and skill-expanded tools:
      * <ul>
-     *   <li>{@link #MINIMAL_SYSTEM_TOOLS} for explicit tools opt-out; otherwise
-     *       {@link #SYSTEM_LEVEL_TOOLS} for compatibility with skill bindings.</li>
+     *   <li>{@link #MINIMAL_SYSTEM_TOOLS} for explicit tools opt-out;
+     *       {@link #SCOPED_TOOL_INTERNAL_TOOLS} when skills are disabled and
+     *       explicit tool bindings exist (including all-disabled rows);
+     *       otherwise {@link #SYSTEM_LEVEL_TOOLS} for compatibility.</li>
      *   <li>Every currently-bindable MCP tool ({@code source="mcp"},
      *       {@code available=true} in the picker) — but only when the agent
-     *       has not ticked any MCP tool itself. MCP servers are
-     *       administrator-level capabilities, so an agent that bound merely
-     *       a skill or a built-in tool keeps full MCP access. Once the
+     *       has not ticked any MCP tool itself and is not in the explicit
+     *       skills-disabled tool scope described above. MCP servers are
+     *       administrator-level capabilities, so a skills-enabled agent that
+     *       bound merely a skill or a built-in tool keeps full MCP access. Once the
      *       operator ticks specific MCP rows, that is read as a deliberate
      *       per-agent scope: only the ticked MCP tools stay and the rest
      *       are not auto-joined, so a role can be limited to a fixed MCP
@@ -548,6 +551,16 @@ public class AgentBindingService implements AgentBindingResolver {
             return null;
         }
 
+        // With skills disabled, explicit tool rows are the complete business
+        // capability selection. Do not infer scope from the live MCP catalog:
+        // stale/offline selections and an explicit empty set must stay scoped.
+        // tools_disabled retains its separate minimal-only opt-out below.
+        if (skillsDisabled && !toolsDisabled && directTools != null) {
+            Set<String> scoped = new LinkedHashSet<>(directTools);
+            scoped.addAll(SCOPED_TOOL_INTERNAL_TOOLS);
+            return scoped;
+        }
+
         Set<String> merged = new LinkedHashSet<>();
 
         if (boundSkillIds != null && !boundSkillIds.isEmpty()) {
@@ -677,6 +690,16 @@ public class AgentBindingService implements AgentBindingResolver {
             "enable_tool", "tool_search", "tool_describe", "tool_call"
     );
 
+    /**
+     * Internal tools for an explicit selection with skills disabled. read_file
+     * preserves access to large MCP results spilled into the workspace; normal
+     * sandbox and global tool-guard restrictions still apply at runtime.
+     * This is deliberately separate from the tools-disabled minimal set.
+     */
+    private static final Set<String> SCOPED_TOOL_INTERNAL_TOOLS = java.util.stream.Stream.concat(
+            MINIMAL_SYSTEM_TOOLS.stream(), java.util.stream.Stream.of("read_file"))
+            .collect(Collectors.toUnmodifiableSet());
+
     /** Compatibility defaults for skill-bound agents that have NOT disabled tools. */
     private static final Set<String> SYSTEM_LEVEL_TOOLS = Set.of(
             // Structured memory primitives — used by every agent regardless
diff --git a/mateclaw-server/src/test/java/vip/mate/agent/AgentGraphBuilderSearchGuidanceTest.java b/mateclaw-server/src/test/java/vip/mate/agent/AgentGraphBuilderSearchGuidanceTest.java
new file mode 100644
index 00000000..ba7671e6
--- /dev/null
+++ b/mateclaw-server/src/test/java/vip/mate/agent/AgentGraphBuilderSearchGuidanceTest.java
@@ -0,0 +1,87 @@
+package vip.mate.agent;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.test.util.ReflectionTestUtils;
+import vip.mate.agent.model.AgentEntity;
+
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+class AgentGraphBuilderSearchGuidanceTest {
+    private AgentGraphBuilder builder;
+
+    @BeforeEach
+    void setUp() {
+        builder = mock(AgentGraphBuilder.class, CALLS_REAL_METHODS);
+        for (var field : AgentGraphBuilder.class.getDeclaredFields()) {
+            if (!Modifier.isStatic(field.getModifiers()) && !field.getType().isPrimitive()) {
+                ReflectionTestUtils.setField(builder, field.getName(), mock(field.getType()));
+            }
+        }
+    }
+
+    @Test void mcpOnlyDoesNotRecommendUnselectedWebTools() throws Exception {
+        String prompt = prompt(false, Set.of("mcp_catalog_search"));
+        assertFalse(prompt.contains("## Web Search Capability"));
+        assertTrue(prompt.contains("exact-name"));
+        assertTrue(prompt.contains("serverId prefixes"));
+    }
+
+    @Test void noToolsHasNoWebGuidance() throws Exception {
+        assertFalse(prompt(false, Set.of()).contains("## Web Search Capability"));
+    }
+
+    @Test void searchOnlyUsesExactRuntimeName() throws Exception {
+        String prompt = prompt(false, Set.of("web_search"));
+        assertTrue(prompt.contains("call the `web_search` tool"));
+        assertFalse(prompt.contains("`browser_use`"));
+        assertFalse(prompt.contains("call the `search` tool"));
+    }
+
+    @Test void browserOnlyRecommendsOnlyBrowserInteraction() throws Exception {
+        String prompt = prompt(false, Set.of("browser_use"));
+        assertTrue(prompt.contains("Call `browser_use` ONLY"));
+        assertFalse(prompt.contains("`web_search`"));
+        assertFalse(prompt.contains("`search` for the same query"));
+    }
+
+    @Test void bothToolsReceivePriorityGuidance() throws Exception {
+        String prompt = prompt(false, Set.of("web_search", "browser_use"));
+        assertTrue(prompt.contains("call the `web_search` tool"));
+        assertTrue(prompt.contains("Call `browser_use` ONLY"));
+        assertTrue(prompt.contains("both `browser_use` and `web_search`"));
+    }
+
+    @Test void nativeSearchDoesNotClaimEveryReplyContainsSearchResults() throws Exception {
+        String prompt = prompt(true, Set.of());
+        assertTrue(prompt.contains("model provider"));
+        assertFalse(prompt.contains("automatically incorporate live web search results"));
+        assertFalse(prompt.contains("already includes real-time search data"));
+        assertFalse(prompt.contains("`web_search`"));
+        assertFalse(prompt.contains("`browser_use`"));
+        assertFalse(prompt.contains("`search` tool"));
+    }
+
+    @Test void nativeSearchUsesReturnedResultsBeforeSupplementaryScopedSearch() throws Exception {
+        String prompt = prompt(true, Set.of("web_search"));
+        assertTrue(prompt.contains("call the `web_search` tool"));
+        assertTrue(prompt.contains("When provider results are available and sufficient, use them directly"));
+        assertFalse(prompt.contains("`browser_use`"));
+        assertFalse(prompt.contains("already includes real-time search data"));
+    }
+
+    private String prompt(boolean nativeSearch, Set<String> names) throws Exception {
+        AgentEntity entity = new AgentEntity();
+        entity.setId(664L);
+        entity.setSystemPrompt("Scoped agent identity");
+        Method method = AgentGraphBuilder.class.getDeclaredMethod("buildEnhancedPrompt",
+                AgentEntity.class, boolean.class, int.class, Set.class);
+        method.setAccessible(true);
+        return (String) method.invoke(builder, entity, nativeSearch, 1024, names);
+    }
+}
diff --git a/mateclaw-server/src/test/java/vip/mate/agent/Issue664McpExecutionIntegrationTest.java b/mateclaw-server/src/test/java/vip/mate/agent/Issue664McpExecutionIntegrationTest.java
new file mode 100644
index 00000000..466bb25f
--- /dev/null
+++ b/mateclaw-server/src/test/java/vip/mate/agent/Issue664McpExecutionIntegrationTest.java
@@ -0,0 +1,303 @@
+package vip.mate.agent;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.sun.net.httpserver.HttpServer;
+import org.junit.jupiter.api.Test;
+import org.springframework.ai.chat.messages.AssistantMessage;
+import org.springframework.ai.chat.model.ToolContext;
+import org.springframework.ai.support.ToolCallbacks;
+import org.springframework.ai.tool.ToolCallback;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.test.util.ReflectionTestUtils;
+import vip.mate.agent.binding.model.AgentToolBinding;
+import vip.mate.agent.binding.repository.*;
+import vip.mate.agent.binding.service.AgentBindingService;
+import vip.mate.agent.context.PrefixBudgetPlan;
+import vip.mate.agent.graph.executor.ToolExecutionExecutor;
+import vip.mate.agent.model.AgentEntity;
+import vip.mate.agent.repository.AgentMapper;
+import vip.mate.llm.model.*;
+import vip.mate.tool.ToolRegistry;
+import vip.mate.tool.builtin.ProgressiveToolBridgeTool;
+import vip.mate.tool.disclosure.*;
+import vip.mate.tool.guard.ToolGuardResult;
+import vip.mate.tool.guard.service.ToolGuardConfigService;
+import vip.mate.tool.mcp.model.McpServerEntity;
+import vip.mate.tool.mcp.runtime.*;
+import vip.mate.tool.mcp.service.McpServerService;
+import vip.mate.tool.service.ToolService;
+
+import java.lang.reflect.Modifier;
+import java.net.InetSocketAddress;
+import java.util.*;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.*;
+
+/** Real HTTP MCP transport and production build filtering; model decisions are scripted tool calls. */
+class Issue664McpExecutionIntegrationTest {
+    static final ObjectMapper JSON = new ObjectMapper();
+    static final String A = McpToolNameResolver.prefixedName(66401L, "search");
+    static final String B = McpToolNameResolver.prefixedName(66402L, "search");
+
+    @Test void selectedServerExecutesThroughBridgeWithoutRecoveringUncheckedTools() throws Exception {
+        try (var a = new FakeMcp(); var b = new FakeMcp()) {
+            var manager = manager();
+            try {
+                manager.connect(a.entity(66401L)); manager.connect(b.entity(66402L));
+                var callbacks = manager.getAllToolCallbacks();
+                assertEquals(Set.of(A, B), names(callbacks));
+                var binding = bindings();
+                var bridge = new ProgressiveToolBridgeTool(mock(ToolRegistry.class), binding,
+                        mock(ToolGuardConfigService.class));
+                var all = new ArrayList<>(callbacks);
+                all.addAll(List.of(ToolCallbacks.from(bridge)));
+                all.add(callback("web_search")); all.add(callback("browser_use"));
+                var scoped = AgentToolSet.fromCallbacks(List.of(), all)
+                        .withAllowedToolsOnly(binding.getEffectiveToolNames(664L));
+                assertTrue(names(scoped.callbacks()).contains(A));
+                assertFalse(names(scoped.callbacks()).contains(B));
+                var context = new ToolContext(Map.of(ProgressiveToolBridgeTool.SCOPED_TOOL_CALLBACKS_CONTEXT_KEY,
+                        scoped.callbackByName()));
+                assertTrue(bridge.search("search", 20, context).contains(A));
+                for (String excluded : List.of(B, "web_search", "browser_use", "search")) {
+                    assertFalse(bridge.search("", 20, context).contains("\"name\":\"" + excluded + "\""));
+                    assertTrue(bridge.describe(excluded, context).contains("not available"));
+                    assertTrue(call(scoped, excluded).contains("not available"));
+                }
+                assertTrue(bridge.describe(A, context).contains("query"));
+                assertEquals("selected MCP result", call(scoped, A));
+                assertEquals(1, a.calls.size()); assertTrue(b.calls.isEmpty());
+                assertEquals("search", a.calls.getFirst().get("name"));
+                assertEquals(Map.of("query", "issue664"), a.calls.getFirst().get("arguments"));
+
+                // Hard schema budgeting hides a selected core schema, while execution retains its scoped callback.
+                var ts = mock(ToolService.class); when(ts.listTools()).thenReturn(List.of());
+                var ms = mock(McpServerService.class);
+                var server = a.entity(66401L); server.setDisclosureTier("core");
+                when(ms.listAll()).thenReturn(List.of(server)); when(ms.listEnabled()).thenReturn(List.of(server));
+                var registry = mock(ToolRegistry.class); when(registry.enabledToolBeanFunctionNameIndex()).thenReturn(Map.of());
+                var disclosure = new DefaultToolDisclosureService(ts, ms, registry, new ToolUsageRecencyTracker());
+                var demoted = disclosure.computeAutoDemotions(scoped, 1);
+                assertTrue(demoted.contains(A));
+                assertFalse(names(disclosure.split(scoped, Set.of(), demoted).activeCallbacks()).contains(A));
+                assertTrue(disclosure.renderExtensionCatalog(scoped, 8192, demoted).contains(A));
+                assertEquals("selected MCP result", call(scoped, A));
+
+                var denied = scoped.withDeniedToolsFiltered(Set.of(A)).withAllowedToolsOnly(binding.getEffectiveToolNames(664L));
+                assertTrue(call(denied, A).contains("not available"));
+                assertEquals(2, a.calls.size());
+                // Oversized remote text is preserved on disk, then retrieved by the actual read_file callback.
+                a.resultText = "fixture line\n".repeat(1000) + "TAIL_EVIDENCE_664\n";
+                var dir = java.nio.file.Files.createTempDirectory("issue664-spill-");
+                try {
+                    var props = new vip.mate.agent.graph.executor.ToolResultProperties();
+                    props.setStorageBaseDir(dir.toString());
+                    var storage = new vip.mate.agent.graph.executor.ToolResultStorage(props);
+                    var reader = new vip.mate.tool.builtin.ReadFileTool(mock(vip.mate.i18n.I18nService.class));
+                    var withReader = new ArrayList<>(scoped.callbacks());
+                    withReader.addAll(List.of(ToolCallbacks.from(reader)));
+                    var readScope = AgentToolSet.fromCallbacks(List.of(), withReader)
+                            .withAllowedToolsOnly(binding.getEffectiveToolNames(664L));
+                    assertTrue(names(readScope.callbacks()).contains("read_file"));
+                    var executor = new ToolExecutionExecutor(readScope, (n,args) -> ToolGuardResult.allow(), null, null);
+                    ReflectionTestUtils.setField(executor, "resultStorage", storage);
+                    var spilled = executor.execute(List.of(new AssistantMessage.ToolCall("large", "function", "tool_call",
+                            "{\"toolName\":\"" + A + "\",\"arguments\":{\"query\":\"large\"}}")),
+                            "issue664-large", "664", false, "user", null).responses().getFirst().responseData();
+                    assertTrue(spilled.startsWith(vip.mate.agent.graph.executor.ToolResultStorage.SPILL_MARKER_PREFIX));
+                    java.nio.file.Path file;
+                    try (var files = java.nio.file.Files.walk(dir)) { file = files.filter(java.nio.file.Files::isRegularFile).findFirst().orElseThrow(); }
+                    assertEquals(a.resultText, java.nio.file.Files.readString(file));
+                    var readArgs = JSON.writeValueAsString(Map.of("filePath", file.toString(), "startLine", 1001));
+                    var retrieved = executor.execute(List.of(new AssistantMessage.ToolCall("read", "function", "read_file", readArgs)),
+                            "issue664-large", "664", false, "user", null).responses().getFirst().responseData();
+                    assertTrue(retrieved.contains("TAIL_EVIDENCE_664"), retrieved);
+                } finally {
+                    try (var files = java.nio.file.Files.walk(dir)) {
+                        for (var file : files.sorted(Comparator.reverseOrder()).toList()) java.nio.file.Files.deleteIfExists(file);
+                    }
+                }
+                manager.remove(66401L);
+                var offline = AgentToolSet.fromCallbacks(List.of(), manager.getAllToolCallbacks())
+                        .withAllowedToolsOnly(binding.getEffectiveToolNames(664L));
+                assertTrue(offline.isEmpty());
+                assertTrue(call(offline, A).contains("not available"));
+                assertTrue(b.calls.isEmpty());
+            } finally { manager.closeAll(); }
+        }
+    }
+
+    @Test void scriptedModelRequestRunsSelectedMcpThroughProductionGraph() throws Exception {
+        var tracker = new vip.mate.channel.web.ChatStreamTracker(JSON);
+        try (var server = new FakeMcp()) {
+            var manager = manager();
+            try {
+                manager.connect(server.entity(66401L));
+                var bridge = new ProgressiveToolBridgeTool(mock(ToolRegistry.class), bindings(), mock(ToolGuardConfigService.class));
+                var callbacks = new ArrayList<>(manager.getAllToolCallbacks());
+                callbacks.addAll(List.of(ToolCallbacks.from(bridge)));
+                var scoped = AgentToolSet.fromCallbacks(List.of(), callbacks).withAllowedToolsOnly(bindings().getEffectiveToolNames(664L));
+                var builder = mock(AgentGraphBuilder.class, CALLS_REAL_METHODS);
+                for (var field : AgentGraphBuilder.class.getDeclaredFields()) {
+                    if (!Modifier.isStatic(field.getModifiers()) && !field.getType().isPrimitive())
+                        ReflectionTestUtils.setField(builder, field.getName(), mock(field.getType()));
+                }
+                ReflectionTestUtils.setField(builder, "streamTracker", tracker);
+                ReflectionTestUtils.setField(builder, "graphObservationProperties", new vip.mate.config.GraphObservationProperties());
+                ReflectionTestUtils.setField(builder, "toolTimeoutProperties", new vip.mate.config.ToolTimeoutProperties());
+                ReflectionTestUtils.setField(builder, "conversationWindowManager", null);
+                ReflectionTestUtils.setField(builder, "progressLedgerService", null);
+                ReflectionTestUtils.setField(builder, "executionCheckpoint", null);
+                ReflectionTestUtils.setField(builder, "executionEvidenceRecorder", null);
+                ReflectionTestUtils.setField(builder, "toolResultStorage", null);
+                ReflectionTestUtils.setField(builder, "generatedFileCache", null);
+                var guard = (vip.mate.tool.guard.service.ToolGuardService) ReflectionTestUtils.getField(builder, "toolGuardService");
+                when(guard.evaluate(any(), eq(true))).thenReturn(vip.mate.tool.guard.model.GuardEvaluation.allow(A));
+                var disclosure = disclosure(server.entity(66401L));
+                ReflectionTestUtils.setField(builder, "toolDisclosureService", disclosure);
+                var advertised = disclosure.split(scoped, Set.of(), Set.of()).activeCallbacks();
+                var prompts = new CopyOnWriteArrayList<org.springframework.ai.chat.prompt.Prompt>();
+                var model = mock(org.springframework.ai.chat.model.ChatModel.class);
+                var emitted = new AssistantMessage.ToolCall("remote", "function", "tool_call",
+                        "{\"toolName\":\"" + A + "\",\"arguments\":{\"query\":\"model-query\"}}");
+                when(model.stream(any(org.springframework.ai.chat.prompt.Prompt.class))).thenAnswer(inv -> {
+                    prompts.add(inv.getArgument(0));
+                    AssistantMessage answer = prompts.size() == 1
+                            ? AssistantMessage.builder().content("").toolCalls(List.of(emitted)).build()
+                            : new AssistantMessage(prompts.size() == 2 ? "selected MCP result" :
+                                    "{\"decision\":\"ACCEPT\",\"taskComplete\":true,\"remainingWork\":false,\"failedCallCount\":0,\"recoveryClaims\":[],\"reason\":\"Selected MCP output matches answer\"}");
+                    return reactor.core.publisher.Flux.just(new org.springframework.ai.chat.model.ChatResponse(
+                            List.of(new org.springframework.ai.chat.model.Generation(answer))));
+                });
+                var graph = builder.buildReActGraph(scoped, model, 5, null);
+                var states = graph.stream(Map.of(vip.mate.agent.graph.state.MateClawStateKeys.CONVERSATION_ID, "issue664-model",
+                        vip.mate.agent.graph.state.MateClawStateKeys.SYSTEM_PROMPT, "Use the selected catalog tool " + A,
+                        vip.mate.agent.graph.state.MateClawStateKeys.USER_MESSAGE, "Search fixture",
+                        vip.mate.agent.graph.state.MateClawStateKeys.MESSAGES, List.of(new org.springframework.ai.chat.messages.UserMessage("Search fixture"))))
+                        .collectList().block(java.time.Duration.ofSeconds(15));
+                assertNotNull(states); assertFalse(states.isEmpty());
+                assertEquals("selected MCP result", states.getLast().state().value(vip.mate.agent.graph.state.MateClawStateKeys.FINAL_ANSWER, ""));
+                assertFalse(prompts.isEmpty());
+                var options = (org.springframework.ai.model.tool.ToolCallingChatOptions) prompts.getFirst().getOptions();
+                assertEquals(names(advertised), names(options.getToolCallbacks()));
+                assertFalse(names(options.getToolCallbacks()).contains(A));
+                assertEquals(1, server.calls.size());
+                assertEquals(Map.of("query", "model-query"), server.calls.getFirst().get("arguments"));
+                assertTrue(prompts.stream().skip(1).anyMatch(prompt -> prompt.getContents().contains("selected MCP result")));
+            } finally { manager.closeAll(); }
+        } finally { tracker.onShutdown(); }
+    }
+
+    @Test void bothProductionBuildPathsReceiveFilteredToolsAndPrompt() throws Exception {
+        for (String type : List.of("react", "plan_execute")) {
+          for (boolean denySelected : List.of(false, true)) {
+            var builder = mock(AgentGraphBuilder.class, CALLS_REAL_METHODS);
+            for (var field : AgentGraphBuilder.class.getDeclaredFields()) {
+                if (!Modifier.isStatic(field.getModifiers()) && !field.getType().isPrimitive())
+                    ReflectionTestUtils.setField(builder, field.getName(), mock(field.getType()));
+            }
+            var registry = (ToolRegistry) ReflectionTestUtils.getField(builder, "toolRegistry");
+            var enabled = AgentToolSet.fromCallbacks(List.of(),
+                    List.of(callback(A), callback(B), callback("web_search"), callback("browser_use")));
+            when(registry.getEnabledToolSet()).thenReturn(enabled);
+            var guardConfig = (ToolGuardConfigService) ReflectionTestUtils.getField(builder, "toolGuardConfigService");
+            when(guardConfig.getDeniedTools()).thenReturn(denySelected ? Set.of(A) : Set.of());
+            ReflectionTestUtils.setField(builder, "agentBindingService", bindings());
+            var provider = new ModelProviderEntity(); provider.setProviderId("fixture"); provider.setChatModel("openai-compatible");
+            var model = new ModelConfigEntity(); model.setProvider("fixture"); model.setModelName("fixture");
+            var models = (vip.mate.llm.service.ModelConfigService) ReflectionTestUtils.getField(builder, "modelConfigService");
+            when(models.resolveModel(any())).thenReturn(model);
+            var providers = (vip.mate.llm.service.ModelProviderService) ReflectionTestUtils.getField(builder, "modelProviderService");
+            when(providers.getProviderConfig("fixture")).thenReturn(provider);
+            when(providers.isProviderConfigured("fixture")).thenReturn(true);
+            var planner = (vip.mate.agent.context.PrefixBudgetPlanner) ReflectionTestUtils.getField(builder, "prefixBudgetPlanner");
+            when(planner.plan(any(), anyInt(), anyInt())).thenReturn(PrefixBudgetPlan.unlimited(16000));
+            var captured = new java.util.concurrent.atomic.AtomicReference<AgentToolSet>();
+            if (type.equals("react")) doAnswer(inv -> { captured.set(inv.getArgument(0)); return mock(vip.mate.agent.graph.StateGraphReActAgent.class); })
+                    .when(builder).buildReActAgent(any(), any(), anyInt(), any(), any(), any(), anySet());
+            else doAnswer(inv -> { captured.set(inv.getArgument(0)); return mock(vip.mate.agent.graph.plan.StateGraphPlanExecuteAgent.class); })
+                    .when(builder).buildPlanExecuteAgent(any(), any(), anyInt(), any(), any(), anySet());
+            var entity = new AgentEntity(); entity.setId(664L); entity.setName("fixture"); entity.setAgentType(type);
+            var agent = builder.build(entity);
+            assertEquals(denySelected ? Set.of() : Set.of(A), names(captured.get().callbacks()));
+            String prompt = (String) ReflectionTestUtils.getField(agent, "systemPrompt");
+            assertFalse(prompt.contains("web_search")); assertFalse(prompt.contains("browser_use"));
+            assertFalse(prompt.contains("调用 search"));
+          }
+        }
+    }
+
+    static Set<String> names(List<ToolCallback> callbacks) {
+        return callbacks.stream().map(cb -> cb.getToolDefinition().name()).collect(java.util.stream.Collectors.toSet());
+    }
+    static ToolCallback callback(String name) {
+        var cb = mock(ToolCallback.class);
+        when(cb.getToolDefinition()).thenReturn(org.springframework.ai.tool.definition.ToolDefinition.builder()
+                .name(name).description(name).inputSchema("{\"type\":\"object\"}").build());
+        return cb;
+    }
+    static String call(AgentToolSet set, String target) {
+        var executor = new ToolExecutionExecutor(set, (n,a) -> ToolGuardResult.allow(), null, null);
+        return executor.execute(List.of(new AssistantMessage.ToolCall("call", "function", "tool_call",
+                "{\"toolName\":\"" + target + "\",\"arguments\":{\"query\":\"issue664\"}}")),
+                "issue664", "664", false, "user", null).responses().getFirst().responseData();
+    }
+    static AgentBindingService bindings() {
+        var agents = mock(AgentMapper.class); var agent = new AgentEntity(); agent.setId(664L); agent.setSkillsDisabled(true);
+        when(agents.selectById(664L)).thenReturn(agent);
+        var tools = mock(AgentToolBindingMapper.class); var row = new AgentToolBinding(); row.setToolName(A); row.setEnabled(true);
+        when(tools.selectList(any())).thenReturn(List.of(row));
+        return new AgentBindingService(mock(AgentSkillBindingMapper.class), tools,
+                mock(AgentProviderPreferenceMapper.class), mock(AgentWikiKbBindingMapper.class),
+                mock(vip.mate.wiki.repository.WikiKnowledgeBaseMapper.class), mock(vip.mate.skill.runtime.SkillRuntimeService.class),
+                mock(vip.mate.tool.service.AvailableToolService.class), agents,
+                mock(vip.mate.skill.repository.SkillMapper.class), mock(vip.mate.skill.acp.AcpSkillBridge.class));
+    }
+    static DefaultToolDisclosureService disclosure(McpServerEntity server) {
+        var tools = mock(ToolService.class);
+        when(tools.listTools()).thenReturn(List.of());
+        var servers = mock(McpServerService.class);
+        when(servers.listAll()).thenReturn(List.of(server));
+        when(servers.listEnabled()).thenReturn(List.of(server));
+        var registry = mock(ToolRegistry.class);
+        when(registry.enabledToolBeanFunctionNameIndex()).thenReturn(Map.of());
+        return new DefaultToolDisclosureService(tools, servers, registry, new ToolUsageRecencyTracker());
+    }
+    static McpClientManager manager() {
+        return new McpClientManager(mock(ApplicationEventPublisher.class),
+                new McpIdentityForwardService(new McpIdentityForwardProperties()), null, JSON);
+    }
+    static class FakeMcp implements AutoCloseable {
+        volatile String resultText = "selected MCP result";
+        final HttpServer http; final List<Map<String,Object>> calls = new CopyOnWriteArrayList<>();
+        FakeMcp() throws Exception {
+            http = HttpServer.create(new InetSocketAddress("127.0.0.1", 0), 0);
+            http.createContext("/mcp", exchange -> {
+                if (!exchange.getRequestMethod().equals("POST")) { exchange.sendResponseHeaders(405,-1); exchange.close(); return; }
+                var request = JSON.readTree(exchange.getRequestBody());
+                if (!request.has("id")) { exchange.sendResponseHeaders(202,-1); exchange.close(); return; }
+                Object result = switch (request.path("method").asText()) {
+                    case "initialize" -> Map.of("protocolVersion", request.path("params").path("protocolVersion").asText(),
+                            "capabilities", Map.of("tools", Map.of()), "serverInfo", Map.of("name", "fixture", "version", "1"));
+                    case "tools/list" -> Map.of("tools", List.of(Map.of("name", "search", "description", "Search fixture",
+                            "inputSchema", Map.of("type", "object", "required", List.of("query"), "properties", Map.of("query", Map.of("type", "string"))))));
+                    case "tools/call" -> { calls.add(JSON.convertValue(request.path("params"), Map.class));
+                        yield Map.of("content", List.of(Map.of("type", "text", "text", resultText)), "isError", false); }
+                    default -> Map.of();
+                };
+                byte[] body = JSON.writeValueAsBytes(Map.of("jsonrpc", "2.0", "id", request.get("id"), "result", result));
+                exchange.getResponseHeaders().set("Content-Type", "application/json");
+                exchange.sendResponseHeaders(200, body.length); exchange.getResponseBody().write(body); exchange.close();
+            }); http.start();
+        }
+        McpServerEntity entity(long id) {
+            var s = new McpServerEntity(); s.setId(id); s.setName("fixture-" + id); s.setTransport("streamable_http");
+            s.setToolsCacheJson("[{\"name\":\"search\",\"description\":\"Search fixture\"}]");
+            s.setUrl("http://127.0.0.1:" + http.getAddress().getPort() + "/mcp"); s.setConnectTimeoutSeconds(3); s.setReadTimeoutSeconds(3); return s;
+        }
+        public void close() { http.stop(0); }
+    }
+}
diff --git a/mateclaw-server/src/test/java/vip/mate/agent/binding/AgentBindingServiceTest.java b/mateclaw-server/src/test/java/vip/mate/agent/binding/AgentBindingServiceTest.java
index d29a9a25..d9e548aa 100644
--- a/mateclaw-server/src/test/java/vip/mate/agent/binding/AgentBindingServiceTest.java
+++ b/mateclaw-server/src/test/java/vip/mate/agent/binding/AgentBindingServiceTest.java
@@ -387,6 +387,107 @@ class AgentBindingServiceTest {
                         + "实际 allowlist: " + effective);
     }
 
+    @Test
+    void skillsDisabledSelectedMcpExcludesUncheckedCapabilities() {
+        seedMcpServerWithOneTool(8_888_664L, "issue664-selected", "search");
+        seedMcpServerWithOneTool(8_888_665L, "issue664-other", "search");
+        String selected = mcpToolNameForServer(8_888_664L);
+        String other = mcpToolNameForServer(8_888_665L);
+        assertNotNull(selected);
+        assertNotNull(other);
+        setSkillsDisabledFlag(true);
+        bindingService.setToolBindings(agentId, List.of(selected));
+
+        Set<String> effective = bindingService.getEffectiveToolNames(agentId);
+        assertTrue(effective.contains(selected));
+        assertFalse(effective.contains(other));
+        assertScopedInternalTools(effective);
+        assertUncheckedBusinessToolsAbsent(effective);
+    }
+
+    @Test
+    void skillsDisabledStaleMcpBindingDoesNotAutoJoinAvailableMcp() {
+        seedMcpServerWithOneTool(8_888_666L, "issue664-offline", "search");
+        seedMcpServerWithOneTool(8_888_667L, "issue664-online", "search");
+        String selected = mcpToolNameForServer(8_888_666L);
+        String other = mcpToolNameForServer(8_888_667L);
+        assertNotNull(selected);
+        assertNotNull(other);
+        setSkillsDisabledFlag(true);
+        bindingService.setToolBindings(agentId, List.of(selected));
+        jdbcTemplate.update("UPDATE mate_mcp_server SET enabled = FALSE, last_status = 'disconnected' WHERE id = ?",
+                8_888_666L);
+
+        Set<String> effective = bindingService.getEffectiveToolNames(agentId);
+        assertTrue(effective.contains(selected), "Saved binding remains scoped even when its provider goes offline");
+        assertFalse(effective.contains(other), "Unavailable selection must not authorize another provider");
+        assertScopedInternalTools(effective);
+        assertUncheckedBusinessToolsAbsent(effective);
+    }
+
+    @Test
+    void skillsDisabledExplicitEmptyBindingDoesNotInheritBusinessToolsOrMcp() {
+        seedMcpServerWithOneTool(8_888_668L, "issue664-empty", "search");
+        setSkillsDisabledFlag(true);
+        bindingService.bindTool(agentId, "disabled_binding_probe");
+        jdbcTemplate.update("UPDATE mate_agent_tool SET enabled = FALSE WHERE agent_id = ?", agentId);
+        assertEquals(Set.of(), bindingService.getBoundToolNames(agentId));
+
+        Set<String> effective = bindingService.getEffectiveToolNames(agentId);
+        assertScopedInternalTools(effective);
+        assertUncheckedBusinessToolsAbsent(effective);
+        assertFalse(effective.contains("disabled_binding_probe"));
+        assertFalse(effective.stream().anyMatch(name -> name.startsWith("mcp_")));
+    }
+
+    @Test
+    void skillsDisabledExplicitBuiltinSelectionIsPreservedWithoutMcpAutoJoin() {
+        seedBuiltinTool("web_search");
+        seedMcpServerWithOneTool(8_888_669L, "issue664-mixed", "search");
+        seedMcpServerWithOneTool(8_888_670L, "issue664-unselected", "search");
+        String selected = mcpToolNameForServer(8_888_669L);
+        assertNotNull(selected);
+        setSkillsDisabledFlag(true);
+        bindingService.setToolBindings(agentId, List.of(selected, "web_search"));
+
+        Set<String> effective = bindingService.getEffectiveToolNames(agentId);
+        assertTrue(effective.containsAll(Set.of(selected, "web_search")));
+        assertFalse(effective.contains(mcpToolNameForServer(8_888_670L)));
+        assertFalse(effective.contains("browser_use"));
+        assertFalse(effective.contains("execute_shell_command"));
+        assertScopedInternalTools(effective);
+    }
+
+    @Test
+    void skillsDisabledBuiltinOnlySelectionDoesNotAutoJoinMcp() {
+        seedBuiltinTool("builtin_only_probe");
+        seedMcpServerWithOneTool(8_888_671L, "issue664-builtin-only", "search");
+        setSkillsDisabledFlag(true);
+        bindingService.setToolBindings(agentId, List.of("builtin_only_probe"));
+
+        Set<String> effective = bindingService.getEffectiveToolNames(agentId);
+        assertTrue(effective.contains("builtin_only_probe"));
+        assertScopedInternalTools(effective);
+        assertUncheckedBusinessToolsAbsent(effective);
+        assertFalse(effective.stream().anyMatch(name -> name.startsWith("mcp_")));
+    }
+
+    private void assertScopedInternalTools(Set<String> effective) {
+        assertNotNull(effective);
+        assertTrue(effective.containsAll(Set.of("read_file", "record_lesson", "get_progress",
+                "getManagedGoalJsonSlots", "publishManagedGoalJson", "checkManagedGoalJson",
+                "enable_tool", "tool_search", "tool_describe", "tool_call")));
+    }
+
+    private void assertUncheckedBusinessToolsAbsent(Set<String> effective) {
+        for (String name : Set.of("web_search", "browser_use", "execute_code", "execute_shell_command",
+                "delegateToAgent", "delegateParallel", "delegateAsync", "taskOutput", "listAvailableAgents",
+                "write_file", "append_file", "edit_file", "send_file", "renderDocx", "image_generate",
+                "wiki_create_page", "load_skill", "runSkillScript", "listAvailableSkills")) {
+            assertFalse(effective.contains(name), "Unchecked capability must not be exposed: " + name);
+        }
+    }
+
     /** Picker name the UI would save for the (only) MCP tool of {@code serverId}. */
     private String mcpToolNameForServer(long serverId) {
         return availableToolService.listAvailable().stream()
@@ -507,7 +608,7 @@ class AgentBindingServiceTest {
     }
 
     @Test
-    @DisplayName("issue #184 matrix (T,F,*,>0): skillsDisabled + 显式 tool 绑定 → 仅这些 tool + SYSTEM + MCP-rule")
+    @DisplayName("issue #184 matrix (T,F,*,>0): skillsDisabled + 显式 tool 绑定 → 仅这些 tool + minimal internal + read_file")
     void skillsDisabledWithToolBindingsScopesToTools() {
         seedBuiltinTool("scoped_tool_probe");
         setSkillsDisabledFlag(true);
diff --git a/mateclaw-server/src/test/java/vip/mate/agent/runtime/dsh/DshSdkTransportTest.java b/mateclaw-server/src/test/java/vip/mate/agent/runtime/dsh/DshSdkTransportTest.java
index b05f3656..d516c6eb 100644
--- a/mateclaw-server/src/test/java/vip/mate/agent/runtime/dsh/DshSdkTransportTest.java
+++ b/mateclaw-server/src/test/java/vip/mate/agent/runtime/dsh/DshSdkTransportTest.java
@@ -44,7 +44,8 @@ class DshSdkTransportTest {
                 read shutdown
                 """);
         try (var sdk = new DshSdkProcess(process, new ObjectMapper(), "")) {
-            assertEquals("0.0.1", sdk.initialize(Map.of(), Duration.ofSeconds(2)).path("serverInfo").path("version").asText());
+            // Allow process/reader scheduling under full-suite load; this verifies identity, not handshake latency.
+            assertEquals("0.0.1", sdk.initialize(Map.of(), Duration.ofSeconds(10)).path("serverInfo").path("version").asText());
         }
         assertTrue(process.waitFor(2, TimeUnit.SECONDS));
     }
diff --git a/mateclaw-server/src/test/java/vip/mate/channel/feishu/FeishuWebSocketTransportTest.java b/mateclaw-server/src/test/java/vip/mate/channel/feishu/FeishuWebSocketTransportTest.java
index 0d827e44..4a8075da 100644
--- a/mateclaw-server/src/test/java/vip/mate/channel/feishu/FeishuWebSocketTransportTest.java
+++ b/mateclaw-server/src/test/java/vip/mate/channel/feishu/FeishuWebSocketTransportTest.java
@@ -48,6 +48,8 @@ class FeishuWebSocketTransportTest {
         OkHttpClient http=(OkHttpClient)field(sdk,"httpClient");
         assertTrue(pool.awaitTermination(3,TimeUnit.SECONDS));
         assertTrue(http.dispatcher().executorService().awaitTermination(3,TimeUnit.SECONDS));
+        // Socket cancellation releases the WebSocket connection through asynchronous failure cleanup.
+        await(()->http.connectionPool().connectionCount()==0);
         assertEquals(0,http.connectionPool().connectionCount());
     }
     @Test void delayedHandshakeStaysReconnectingThenUsesOnlyOneClient() throws Exception {
diff --git a/mateclaw-server/src/test/java/vip/mate/channel/webchat/WebChatAttachmentE2ETest.java b/mateclaw-server/src/test/java/vip/mate/channel/webchat/WebChatAttachmentE2ETest.java
index d82e0e04..85c1356c 100644
--- a/mateclaw-server/src/test/java/vip/mate/channel/webchat/WebChatAttachmentE2ETest.java
+++ b/mateclaw-server/src/test/java/vip/mate/channel/webchat/WebChatAttachmentE2ETest.java
@@ -3,12 +3,15 @@ package vip.mate.channel.webchat;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.context.bean.override.mockito.MockitoBean;
 import org.springframework.boot.test.web.server.LocalServerPort;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
 import reactor.core.publisher.Flux;
 import vip.mate.MateClawApplication;
 import vip.mate.agent.AgentService;
@@ -24,11 +27,8 @@ import java.net.http.HttpResponse;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.time.Duration;
-import java.util.Comparator;
 import java.util.Map;
-import java.util.stream.Stream;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
@@ -77,12 +77,14 @@ class WebChatAttachmentE2ETest {
     private static final long AGENT_ID = 9_148_1011L;
     private static final Duration HTTP_TIMEOUT = Duration.ofSeconds(15);
 
-    /**
-     * Wipe the upload dir for our test conversation ids. The path is deterministic
-     * from the API key prefix, so we can clean it precisely instead of nuking
-     * the whole {@code data/chat-uploads} tree.
-     */
-    private static final Path UPLOAD_ROOT = Paths.get("data", "chat-uploads");
+    /** Each test-class run owns its upload tree; JUnit removes it after the class. */
+    @TempDir
+    static Path uploadRoot;
+
+    @DynamicPropertySource
+    static void uploadProperties(DynamicPropertyRegistry registry) {
+        registry.add("mateclaw.chat.upload.base-dir", () -> uploadRoot.toString());
+    }
 
     @LocalServerPort private int port;
     @Autowired private JdbcTemplate jdbc;
@@ -245,21 +247,6 @@ class WebChatAttachmentE2ETest {
         return end < 0 ? null : json.substring(start, end);
     }
 
-    // ==================== cleanup ====================
-
-    @org.junit.jupiter.api.AfterEach
-    void cleanUploadDirs() throws IOException {
-        // Only the convs under our key8 prefix are ours; safe to wipe.
-        Path root = UPLOAD_ROOT.resolve("webchat:testkey1");
-        if (Files.exists(root)) {
-            try (Stream<Path> walk = Files.walk(root)) {
-                walk.sorted(Comparator.reverseOrder()).forEach(p -> {
-                    try { Files.deleteIfExists(p); } catch (IOException ignored) { }
-                });
-            }
-        }
-    }
-
     // ==================== tests ====================
 
     @Test
@@ -288,6 +275,7 @@ class WebChatAttachmentE2ETest {
         // on Windows), so assert against the sanitized segment.
         String path = extractStringField(parts, "path");
         assertThat(path).contains(ChatUploadLocationResolver.sanitizeSegment(cid));
+        assertThat(Path.of(path).toAbsolutePath().normalize()).startsWith(uploadRoot.toAbsolutePath().normalize());
         assertThat(Files.isRegularFile(Path.of(path))).isTrue();
         // The bytes on disk match what we uploaded.
         assertThat(Files.readString(Path.of(path))).isEqualTo(fileBody);