diff --git a/schemas/roomodes.json b/schemas/roomodes.json
index 14e6b53b4b..90b6f55fa0 100644
--- a/schemas/roomodes.json
+++ b/schemas/roomodes.json
@@ -18,8 +18,8 @@
 	"definitions": {
 		"ToolGroup": {
 			"type": "string",
-			"enum": ["read", "edit", "command", "mcp", "modes"],
-			"description": "A tool group name that grants the mode access to a set of tools."
+			"enum": ["read", "edit", "browser", "command", "mcp", "modes"],
+			"description": "A tool group name that grants the mode access to a set of tools. Note: 'browser' is deprecated but still accepted for backward compatibility."
 		},
 		"GroupOptions": {
 			"type": "object",
@@ -48,6 +48,22 @@
 			"description": "A tool group permission entry. Either a simple tool group name string, or a [toolGroupName, options] tuple for groups with file restrictions.",
 			"oneOf": [{ "$ref": "#/definitions/ToolGroup" }, { "$ref": "#/definitions/GroupEntryTuple" }]
 		},
+		"RuleFile": {
+			"type": "object",
+			"description": "A rules file associated with a mode, used during import/export.",
+			"required": ["relativePath", "content"],
+			"additionalProperties": false,
+			"properties": {
+				"relativePath": {
+					"type": "string",
+					"description": "The relative file path for the rules file."
+				},
+				"content": {
+					"type": "string",
+					"description": "The text content of the rules file."
+				}
+			}
+		},
 		"CustomMode": {
 			"type": "object",
 			"description": "A custom mode definition.",
@@ -92,6 +108,13 @@
 					"type": "string",
 					"enum": ["global", "project"],
 					"description": "Where this mode was defined. Automatically set by Roo Code."
+				},
+				"rulesFiles": {
+					"type": "array",
+					"description": "Rules files associated with this mode, used during import/export.",
+					"items": {
+						"$ref": "#/definitions/RuleFile"
+					}
 				}
 			}
 		}
diff --git a/src/utils/__tests__/roomodes-schema.spec.ts b/src/utils/__tests__/roomodes-schema.spec.ts
index 6e410a40bc..52784ee430 100644
--- a/src/utils/__tests__/roomodes-schema.spec.ts
+++ b/src/utils/__tests__/roomodes-schema.spec.ts
@@ -273,6 +273,119 @@ describe("roomodes JSON schema", () => {
 		expect(valid).toBe(true)
 	})
 
+	it("should accept the browser tool group (deprecated but valid)", () => {
+		const config = {
+			customModes: [
+				{
+					slug: "browser-mode",
+					name: "Browser Mode",
+					roleDefinition: "A mode that uses the browser tool group.",
+					groups: ["read", "browser", "command"],
+				},
+			],
+		}
+
+		const valid = validate(config)
+		expect(validate.errors).toBeNull()
+		expect(valid).toBe(true)
+	})
+
+	it("should accept a browser tuple group entry", () => {
+		const config = {
+			customModes: [
+				{
+					slug: "browser-tuple",
+					name: "Browser Tuple",
+					roleDefinition: "A mode with browser tuple.",
+					groups: [["browser", { fileRegex: "\\.html$", description: "HTML files only" }]],
+				},
+			],
+		}
+
+		const valid = validate(config)
+		expect(validate.errors).toBeNull()
+		expect(valid).toBe(true)
+	})
+
+	it("should accept a mode with rulesFiles", () => {
+		const config = {
+			customModes: [
+				{
+					slug: "rules-mode",
+					name: "Rules Mode",
+					roleDefinition: "A mode with rules files.",
+					groups: ["read"],
+					rulesFiles: [
+						{
+							relativePath: "rule1.md",
+							content: "# Rule 1\nFollow this rule.",
+						},
+						{
+							relativePath: "subfolder/rule2.md",
+							content: "# Rule 2\nFollow this other rule.",
+						},
+					],
+				},
+			],
+		}
+
+		const valid = validate(config)
+		expect(validate.errors).toBeNull()
+		expect(valid).toBe(true)
+	})
+
+	it("should accept a mode with empty rulesFiles array", () => {
+		const config = {
+			customModes: [
+				{
+					slug: "empty-rules",
+					name: "Empty Rules",
+					roleDefinition: "A mode with empty rules files.",
+					groups: ["read"],
+					rulesFiles: [],
+				},
+			],
+		}
+
+		const valid = validate(config)
+		expect(validate.errors).toBeNull()
+		expect(valid).toBe(true)
+	})
+
+	it("should reject rulesFiles entries missing required fields", () => {
+		const config = {
+			customModes: [
+				{
+					slug: "bad-rules",
+					name: "Bad Rules",
+					roleDefinition: "A mode with invalid rules files.",
+					groups: ["read"],
+					rulesFiles: [{ relativePath: "rule1.md" }],
+				},
+			],
+		}
+
+		const valid = validate(config)
+		expect(valid).toBe(false)
+	})
+
+	it("should reject rulesFiles entries with extra properties", () => {
+		const config = {
+			customModes: [
+				{
+					slug: "extra-rules",
+					name: "Extra Rules",
+					roleDefinition: "A mode with extra rule properties.",
+					groups: ["read"],
+					rulesFiles: [{ relativePath: "rule1.md", content: "content", extra: true }],
+				},
+			],
+		}
+
+		const valid = validate(config)
+		expect(valid).toBe(false)
+	})
+
 	it("should accept multiple modes", () => {
 		const config = {
 			customModes: [