perf: optimize environment details by omitting identical records

Added prevEnvDetails property to Task class to store previous environment state.
Modified getEnvironmentDetails to recursively compare current and previous
environment details, returning only the differences.

This optimization reduces the size of environment details in responses by
omitting any records that are identical to the previous state.

Fixes: #5844
Signed-off-by: Eric Wheeler <roo-code@z.ewheeler.org>

src/core/environment/context/metadata.ts

@@ -30,7 +30,7 @@ export async function getMetadataContext(cline: Task) {
 		.padStart(2, "0")}:${offsetMinutes.toString().padStart(2, "0")}`
 	const isoDateWithOffset = now.toISOString().replace(/Z$/, offsetString)
 	const time = {
-		"@v": isoDateWithOffset,
+		"@I": isoDateWithOffset,
 	}
 
 	const { totalCost } = getApiMetrics(cline.clineMessages)

src/core/environment/getEnvironmentDetails.ts

@@ -19,7 +19,7 @@ export async function getEnvironmentDetails(task: Task, includeFileDetails: bool
 			getTodoContext(task),
 		])
 
-	const envDetails = {
+	const currentEnvDetails = {
 		...vscodeContext,
 		...terminalContext,
 		...fileContext,
@@ -28,6 +28,10 @@ export async function getEnvironmentDetails(task: Task, includeFileDetails: bool
 		...todoContext,
 	}
 
+	const diffEnvDetails = _envDiff(currentEnvDetails, task.prevEnvDetails)
+
+	task.prevEnvDetails = currentEnvDetails
+
 	const builder = new XMLBuilder({
 		format: true, // Enable pretty printing
 		indentBy: "  ", // Use two spaces for indentation
@@ -38,5 +42,54 @@ export async function getEnvironmentDetails(task: Task, includeFileDetails: bool
 		textNodeName: "#text",
 	})
 
-	return builder.build({ environment_details: envDetails })
+	return builder.build({ environment_details: diffEnvDetails })
+}
+
+function _envDiff(current: any, previous: any): any {
+	if (!previous) return current
+
+	return Object.keys(current).reduce((acc, key) => {
+		const currentValue = current[key]
+		const previousValue = previous ? previous[key] : undefined
+
+		if (_objIsEqual(currentValue, previousValue)) {
+			return acc
+		}
+
+		// Check for nested objects (but not arrays)
+		if (
+			typeof currentValue === "object" &&
+			currentValue !== null &&
+			!Array.isArray(currentValue) &&
+			typeof previousValue === "object" &&
+			previousValue !== null &&
+			!Array.isArray(previousValue)
+		) {
+			const nestedDiff = _envDiff(currentValue, previousValue)
+			if (Object.keys(nestedDiff).length > 0) {
+				acc[key] = nestedDiff
+			}
+		} else {
+			// For primitives, arrays, or if previous was not an object
+			acc[key] = currentValue
+		}
+
+		return acc
+	}, {} as any)
+}
+
+function _objIsEqual(a: any, b: any): boolean {
+	if (a === b) return true
+	if (a === null || b === null || typeof a !== "object" || typeof b !== "object") return false
+
+	const keysA = Object.keys(a)
+	const keysB = Object.keys(b)
+
+	if (keysA.length !== keysB.length) return false
+
+	for (const key of keysA) {
+		if (!keysB.includes(key) || !_objIsEqual(a[key], b[key])) return false
+	}
+
+	return true
 }

src/core/task/Task.ts

@@ -180,6 +180,7 @@ export class Task extends EventEmitter<ClineEvents> {
 	// LLM Messages & Chat Messages
 	apiConversationHistory: ApiMessage[] = []
 	clineMessages: ClineMessage[] = []
+	prevEnvDetails?: Record<string, any>
 
 	// Ask
 	private askResponse?: ClineAskResponse