@@ -152,6 +152,24 @@ built-in `tpa-descriptions` scanner. Its findings appear in the scan report
 `threat_level`, `confidence`, and the contributing check `signals`. See
 [Tool Scanner](/features/tool-scanner) for the full rule reference.
 
+## Prompt rug-pull baseline (spec 100)
+
+When upstream **prompt aggregation** is enabled (`aggregate_upstream_prompts: true`, off by default), mcpproxy keeps a per-prompt approval baseline that mirrors the tool rug-pull machinery. A trusted server that ships a benign prompt and later mutates its **advertised metadata** (name, description, or argument descriptions) has that changed prompt **withheld from `prompts/list`** until it is approved — closing the gap where a subtler injection that passes the poison scanner could still slip in via a later edit.
+
+- **Scope — metadata only.** The baseline hashes the prompt's advertised metadata, not its `prompts/get` message content (which is materialised fresh per call and has no list-time artifact to baseline). Content is defended separately by output sanitisation and size caps. This is an inherent limit, not a shortcut.
+- **Enforcement is by withholding.** A held prompt is simply not registered, so it is absent from `prompts/list` and `prompts/get` on it fails natively. There is no separate runtime gate.
+- **Trust parity.** A server with `trust_mode: auto` (or `auto_approve_tool_changes: true`) auto-approves its prompt changes; `manual` holds them. Disabling quarantine globally (`quarantine_enabled: false`) auto-approves.
+
+Manage held prompts with the `quarantine_security` MCP tool:
+
+```jsonc
+// see what is held (all servers, or one via "name")
+{ "operation": "inspect_prompts", "name": "github" }
+// approve one held prompt, or all for a server
+{ "operation": "approve_prompt", "name": "github", "prompt_name": "summarize_pr" }
+{ "operation": "approve_all_prompts", "name": "github" }
+```
+
 ## Managing Quarantine
 
 ### View Quarantined Servers
 
@@ -1152,6 +1152,9 @@ func (p *MCPProxyServer) buildManagementTools() []mcpserver.ServerTool {
 				mcp.Description("Per-server trust tier governing new-server admission AND tool-change approval (spec 086): 'auto' = approve without scanning; 'scan' = auto-approve only when the fast offline TPA scan is green, else hold for review; 'manual' = human reviews every change. Empty → manual (secure default). Used with add/update/patch."),
 				mcp.Enum("auto", "scan", "manual"),
 			),
+			mcp.WithBoolean("expose_prompts",
+				mcp.Description("Per-server prompt-aggregation override (F9): true = include this server's MCP prompts in mcpproxy's aggregated prompts/list; false = exclude them regardless of capability. Omit to leave unchanged (patch) / inherit the default (aggregate if advertised). Only meaningful when aggregate_upstream_prompts is enabled globally. Used with add/update/patch."),
+			),
 		)
 		tools = append(tools, mcpserver.ServerTool{Tool: upstreamServersTool, Handler: p.handleUpstreamServers})
 	}
@@ -1166,15 +1169,18 @@ func (p *MCPProxyServer) buildManagementTools() []mcpserver.ServerTool {
 			mcp.WithOpenWorldHintAnnotation(false),
 			mcp.WithString("operation",
 				mcp.Required(),
-				mcp.Description("Security operation: list_quarantined, inspect_quarantined, quarantine_server, inspect_tools, approve_tool, approve_all_tools, block_tool, block_all_tools, enable_tool, disable_tool. 'block_tool'/'block_all_tools' atomically approve AND disable a tool (acknowledge it but keep it hidden) — all-or-nothing so a tool is never left approved+enabled."),
-				mcp.Enum("list_quarantined", "inspect_quarantined", "quarantine_server", "inspect_tools", "approve_tool", "approve_all_tools", "block_tool", "block_all_tools", "enable_tool", "disable_tool"),
+				mcp.Description("Security operation: list_quarantined, inspect_quarantined, quarantine_server, inspect_tools, approve_tool, approve_all_tools, block_tool, block_all_tools, enable_tool, disable_tool, inspect_prompts, approve_prompt, approve_all_prompts. 'block_tool'/'block_all_tools' atomically approve AND disable a tool (acknowledge it but keep it hidden) — all-or-nothing so a tool is never left approved+enabled. The prompt operations (spec 100) manage aggregated upstream prompts held by the metadata rug-pull baseline: a prompt whose advertised metadata changed since approval is withheld from prompts/list until approved."),
+				mcp.Enum("list_quarantined", "inspect_quarantined", "quarantine_server", "inspect_tools", "approve_tool", "approve_all_tools", "block_tool", "block_all_tools", "enable_tool", "disable_tool", "inspect_prompts", "approve_prompt", "approve_all_prompts"),
 			),
 			mcp.WithString("name",
-				mcp.Description("Server name (required for inspect_quarantined, quarantine_server, inspect_tools, approve_tool, approve_all_tools, block_tool, block_all_tools)"),
+				mcp.Description("Server name (required for inspect_quarantined, quarantine_server, inspect_tools, approve_tool, approve_all_tools, block_tool, block_all_tools, approve_prompt, approve_all_prompts)"),
 			),
 			mcp.WithString("tool_name",
 				mcp.Description("Tool name (required for approve_tool and block_tool operations)"),
 			),
+			mcp.WithString("prompt_name",
+				mcp.Description("Prompt name (required for approve_prompt; spec 100)"),
+			),
 		)
 		tools = append(tools, mcpserver.ServerTool{Tool: quarantineSecurityTool, Handler: p.handleQuarantineSecurity})
 	}
@@ -3410,6 +3416,12 @@ func (p *MCPProxyServer) handleQuarantineSecurity(ctx context.Context, request m
 		result, opErr = p.handleSetToolEnabledByName(request, true)
 	case "disable_tool":
 		result, opErr = p.handleSetToolEnabledByName(request, false)
+	case "inspect_prompts":
+		result, opErr = p.handleInspectPromptApprovals(request)
+	case "approve_prompt":
+		result, opErr = p.handleApprovePromptByName(request)
+	case "approve_all_prompts":
+		result, opErr = p.handleApproveAllPromptsByServer(request)
 	default:
 		p.emitActivityInternalToolCall("quarantine_security", "", "", "", sessionID, requestID, "error", fmt.Sprintf("Unknown quarantine operation: %s", operation), time.Since(startTime).Milliseconds(), args, nil, nil, "")
 		return mcp.NewToolResultError(fmt.Sprintf("Unknown quarantine operation: %s", operation)), nil
@@ -4603,6 +4615,16 @@ func (p *MCPProxyServer) handleAddUpstream(ctx context.Context, request mcp.Call
 		TrustMode:   trustMode, // spec 086: carry the per-server trust_mode through on create
 	}
 
+	// F9: optional per-server expose_prompts override on add. GetBool can't tell
+	// absent from false, so probe the raw args for presence.
+	if rawArgs := request.GetArguments(); rawArgs != nil {
+		if raw, ok := rawArgs["expose_prompts"]; ok {
+			if b, ok := raw.(bool); ok {
+				serverConfig.ExposePrompts = &b
+			}
+		}
+	}
+
 	// Save to storage
 	if err := p.storage.SaveUpstreamServer(serverConfig); err != nil {
 		return mcp.NewToolResultError(fmt.Sprintf("Failed to add upstream: %v", err)), nil
@@ -5119,6 +5141,19 @@ func (p *MCPProxyServer) buildPatchConfigFromRequest(request mcp.CallToolRequest
 		patch.InitTimeout = &v
 	}
 
+	// F9: per-server expose_prompts override. GetBool collapses absent→false, so
+	// detect key presence in the raw args and only set the pointer when the caller
+	// actually provided it (nil = leave unchanged for MergeServerConfig).
+	if args := request.GetArguments(); args != nil {
+		if raw, ok := args["expose_prompts"]; ok {
+			b, ok := raw.(bool)
+			if !ok {
+				return nil, opts, fmt.Errorf("invalid expose_prompts: must be a boolean, got %T", raw)
+			}
+			patch.ExposePrompts = &b
+		}
+	}
+
 	// Handle oauth JSON string - deep merge for nested config
 	if oauthJSON := request.GetString("oauth_json", ""); oauthJSON != "" {
 		// Check for explicit null removal
 
@@ -338,3 +338,80 @@ func (p *MCPProxyServer) ApproveAllPrompts(serverName, approvedBy string) (int,
 	}
 	return approved, nil
 }
+
+// --- MCP quarantine_security prompt operations (spec 100 FR-7) ---
+
+// handleInspectPromptApprovals returns the prompt approval records for a server
+// (all servers when 'name' is omitted), with pending/changed counts so an agent
+// can see which prompts the rug-pull baseline is withholding.
+func (p *MCPProxyServer) handleInspectPromptApprovals(request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+	if p.storage == nil {
+		return mcp.NewToolResultError("storage unavailable"), nil
+	}
+	serverName := request.GetString("name", "")
+	recs, err := p.storage.ListPromptApprovals(serverName)
+	if err != nil {
+		return mcp.NewToolResultError(fmt.Sprintf("Failed to list prompt approvals: %v", err)), nil
+	}
+	type promptView struct {
+		Server      string `json:"server"`
+		Prompt      string `json:"prompt"`
+		Status      string `json:"status"`
+		ChangedFrom string `json:"changed_from,omitempty"`
+	}
+	var pending, changed int
+	views := make([]promptView, 0, len(recs))
+	for _, r := range recs {
+		switch r.Status {
+		case promptStatusPending:
+			pending++
+		case promptStatusChanged:
+			changed++
+		}
+		v := promptView{Server: r.ServerName, Prompt: r.PromptName, Status: r.Status}
+		if r.Status == promptStatusChanged && r.PreviousDescription != "" {
+			v.ChangedFrom = r.PreviousDescription
+		}
+		views = append(views, v)
+	}
+	payload := map[string]interface{}{
+		"prompts":         views,
+		"pending_count":   pending,
+		"changed_count":   changed,
+		"action_required": pending + changed,
+	}
+	b, err := json.MarshalIndent(payload, "", "  ")
+	if err != nil {
+		return mcp.NewToolResultError(fmt.Sprintf("Failed to encode: %v", err)), nil
+	}
+	return mcp.NewToolResultText(string(b)), nil
+}
+
+// handleApprovePromptByName approves one held prompt (re-baselines it).
+func (p *MCPProxyServer) handleApprovePromptByName(request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+	serverName := request.GetString("name", "")
+	if serverName == "" {
+		return mcp.NewToolResultError("Missing required parameter 'name' (server name)"), nil
+	}
+	promptName := request.GetString("prompt_name", "")
+	if promptName == "" {
+		return mcp.NewToolResultError("Missing required parameter 'prompt_name'"), nil
+	}
+	if err := p.ApprovePrompt(serverName, promptName, "mcp"); err != nil {
+		return mcp.NewToolResultError(fmt.Sprintf("Failed to approve prompt '%s': %v", promptName, err)), nil
+	}
+	return mcp.NewToolResultText(fmt.Sprintf("Prompt '%s' on server '%s' has been approved.", promptName, serverName)), nil
+}
+
+// handleApproveAllPromptsByServer approves every held prompt for a server.
+func (p *MCPProxyServer) handleApproveAllPromptsByServer(request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
+	serverName := request.GetString("name", "")
+	if serverName == "" {
+		return mcp.NewToolResultError("Missing required parameter 'name' (server name)"), nil
+	}
+	n, err := p.ApproveAllPrompts(serverName, "mcp")
+	if err != nil {
+		return mcp.NewToolResultError(fmt.Sprintf("Failed to approve prompts for '%s': %v", serverName, err)), nil
+	}
+	return mcp.NewToolResultText(fmt.Sprintf("Approved %d prompt(s) on server '%s'.", n, serverName)), nil
+}
@@ -162,3 +162,47 @@ func TestApproveAllPrompts(t *testing.T) {
 
 // Guard: the storage record type is what we expect (compile-time contract).
 var _ = storage.PromptApprovalRecord{}
+
+// --- MCP quarantine_security prompt op handlers ---
+
+func TestHandlePromptApprovalOps(t *testing.T) {
+	proxy := manualTrustProxy(t)
+	proxy.checkPromptApprovals([]mcp.Prompt{{Name: "srv:a", Description: "1"}, {Name: "srv:b", Description: "2"}})
+
+	// inspect_prompts reports the two held prompts.
+	insp, err := proxy.handleInspectPromptApprovals(mcp.CallToolRequest{Params: mcp.CallToolParams{
+		Arguments: map[string]interface{}{"name": "srv"},
+	}})
+	require.NoError(t, err)
+	require.False(t, insp.IsError)
+	body := insp.Content[0].(mcp.TextContent).Text
+	assert.Contains(t, body, "\"pending_count\": 2")
+	assert.Contains(t, body, "\"action_required\": 2")
+
+	// approve_prompt approves one.
+	ap, err := proxy.handleApprovePromptByName(mcp.CallToolRequest{Params: mcp.CallToolParams{
+		Arguments: map[string]interface{}{"name": "srv", "prompt_name": "a"},
+	}})
+	require.NoError(t, err)
+	assert.False(t, ap.IsError)
+	rec, _ := proxy.storage.GetPromptApproval("srv", "a")
+	assert.Equal(t, promptStatusApproved, rec.Status)
+
+	// approve_all_prompts approves the rest.
+	aa, err := proxy.handleApproveAllPromptsByServer(mcp.CallToolRequest{Params: mcp.CallToolParams{
+		Arguments: map[string]interface{}{"name": "srv"},
+	}})
+	require.NoError(t, err)
+	assert.Contains(t, aa.Content[0].(mcp.TextContent).Text, "Approved 1 prompt")
+	recB, _ := proxy.storage.GetPromptApproval("srv", "b")
+	assert.Equal(t, promptStatusApproved, recB.Status)
+}
+
+func TestHandleApprovePromptByName_MissingArgs(t *testing.T) {
+	proxy := manualTrustProxy(t)
+	res, err := proxy.handleApprovePromptByName(mcp.CallToolRequest{Params: mcp.CallToolParams{
+		Arguments: map[string]interface{}{"name": "srv"},
+	}})
+	require.NoError(t, err)
+	assert.True(t, res.IsError, "missing prompt_name is an error result")
+}