diff --git a/workspace-server/internal/handlers/mcp_tools_memory_v2.go b/workspace-server/internal/handlers/mcp_tools_memory_v2.go
index 00c991523..f076d5171 100644
--- a/workspace-server/internal/handlers/mcp_tools_memory_v2.go
+++ b/workspace-server/internal/handlers/mcp_tools_memory_v2.go
@@ -31,6 +31,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/Molecule-AI/molecule-monorepo/platform/internal/events"
 	"github.com/Molecule-AI/molecule-monorepo/platform/internal/memory/client"
 	"github.com/Molecule-AI/molecule-monorepo/platform/internal/memory/contract"
 	"github.com/Molecule-AI/molecule-monorepo/platform/internal/memory/namespace"
@@ -154,6 +155,14 @@ func (h *MCPHandler) toolCommitMemoryV2(ctx context.Context, workspaceID string,
 		}
 	}
 
+	// Broadcast ACTIVITY_LOGGED so the canvas Memory tab live-refreshes
+	// (issue #1754). Fire-and-forget — broadcast failure must not roll
+	// back a successful plugin write. Source=agent because this is the
+	// MCP path (vs canvas user-driven POST /memories which the legacy
+	// handler logs with `memory_write_global`).
+	summary := "commit_memory to " + ns
+	logMemoryMCPActivity(ctx, h.broadcaster, workspaceID, "memory_write", resp.ID, ns, &summary)
+
 	out, _ := json.Marshal(resp)
 	return string(out), nil
 }
@@ -258,6 +267,11 @@ func (h *MCPHandler) toolCommitSummary(ctx context.Context, workspaceID string,
 	if err != nil {
 		return "", fmt.Errorf("plugin commit: %w", err)
 	}
+
+	// Broadcast ACTIVITY_LOGGED for live canvas refresh (#1754).
+	summary := "commit_summary to " + ns
+	logMemoryMCPActivity(ctx, h.broadcaster, workspaceID, "memory_summary_write", resp.ID, ns, &summary)
+
 	out, _ := json.Marshal(resp)
 	return string(out), nil
 }
@@ -320,6 +334,13 @@ func (h *MCPHandler) toolForgetMemory(ctx context.Context, workspaceID string, a
 	}); err != nil {
 		return "", fmt.Errorf("plugin forget: %w", err)
 	}
+
+	// Broadcast ACTIVITY_LOGGED for live canvas refresh (#1754).
+	// On forget, target_id carries the forgotten memory's id so the
+	// canvas can remove the row optimistically.
+	summary := "forget_memory " + memID + " from " + ns
+	logMemoryMCPActivity(ctx, h.broadcaster, workspaceID, "memory_delete", memID, ns, &summary)
+
 	return `{"forgotten":true}`, nil
 }
 
@@ -393,3 +414,43 @@ func pickStringSlice(args map[string]interface{}, key string) []string {
 	}
 	return nil
 }
+
+// logMemoryMCPActivity fires the ACTIVITY_LOGGED broadcast for MCP-tool
+// memory writes/deletes (issue #1754). The canvas Memory tab subscribes
+// to memory_* activity_types via the WS feed; without this call, the
+// panel only refreshes when the user hits the manual reload button.
+//
+// Fire-and-forget: broadcast failure must never roll back a successful
+// plugin write. The underlying LogActivity helper already logs insert
+// errors and swallows them — wrap with a nil-broadcaster guard so test
+// fixtures without an events.Broadcaster don't nil-deref.
+//
+// IMPORTANT: takes *events.Broadcaster (concrete pointer), not
+// events.EventEmitter (interface). Passing a nil *Broadcaster as
+// EventEmitter creates a typed-nil interface that does NOT compare
+// equal to nil — and would derefence inside LogActivity. Keeping the
+// concrete type here lets the nil-check work reliably.
+//
+// Args:
+//   - activityType: "memory_write" / "memory_summary_write" / "memory_delete"
+//   - targetID: the affected memory's id (the canvas uses this for
+//     optimistic add/remove without a full refetch)
+//   - namespace: the v2 namespace the row landed in (canvas filters
+//     its display by readable-namespace intersection)
+func logMemoryMCPActivity(ctx context.Context, broadcaster *events.Broadcaster, workspaceID, activityType, targetID, namespace string, summary *string) {
+	if broadcaster == nil {
+		return
+	}
+	source := workspaceID
+	target := targetID
+	method := namespace
+	LogActivity(ctx, broadcaster, ActivityParams{
+		WorkspaceID:  workspaceID,
+		ActivityType: activityType,
+		SourceID:     &source,
+		TargetID:     &target,
+		Method:       &method,
+		Summary:      summary,
+		Status:       "ok",
+	})
+}