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feat: add support for separate apply models for diff operations
- Add apply model configuration to provider settings schema - Create ApplyModelDiffStrategy for using dedicated apply models - Update Task class to support apply model configuration - Add comprehensive tests for the new functionality This addresses issue #5880 by allowing users to configure separate models like Morph Fast Apply or Relace Instant Apply for applying changes instead of having the main chat model generate diffs. Benefits: - Reduced token consumption for file edits - Improved reliability for complex changes - Better performance for continuous edits - Support for specialized apply models
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‎packages/types/src/provider-settings.ts‎

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@@ -71,6 +71,14 @@ const baseProviderSettingsSchema = z.object({
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reasoningEffort: reasoningEffortsSchema.optional(),
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modelMaxTokens: z.number().optional(),
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modelMaxThinkingTokens: z.number().optional(),
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// Apply model configuration for separate diff application
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applyModelEnabled: z.boolean().optional(),
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applyModelProvider: providerNamesSchema.optional(),
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applyModelId: z.string().optional(),
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applyModelApiKey: z.string().optional(),
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applyModelBaseUrl: z.string().optional(),
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applyModelTemperature: z.number().nullish(),
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})
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// Several of the providers share common model config properties.

‎src/core/diff/strategies/__tests__/apply-model-diff-strategy.test.ts‎

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import { describe, it, expect, vi, beforeEach } from "vitest"
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import { ApplyModelDiffStrategy } from "../apply-model-diff-strategy"
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import { Task } from "../../../task/Task"
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// Mock the Task class
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const mockTask = {
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providerRef: {
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deref: () => ({
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getSettings: () => ({
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applyModelEnabled: false,
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applyModelProvider: "openai",
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applyModelId: "gpt-4",
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applyModelApiKey: "test-key",
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applyModelBaseUrl: "https://api.openai.com/v1",
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applyModelTemperature: 0.1,
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}),
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}),
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},
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} as unknown as Task
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describe("ApplyModelDiffStrategy", () => {
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let strategy: ApplyModelDiffStrategy
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beforeEach(() => {
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strategy = new ApplyModelDiffStrategy(mockTask, 1.0)
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})
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it("should have correct name", () => {
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expect(strategy.getName()).toBe("ApplyModel")
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})
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it("should return tool description", () => {
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const description = strategy.getToolDescription({ cwd: "/test" })
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expect(description).toContain("apply_diff")
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expect(description).toContain("AI-powered apply model")
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expect(description).toContain("/test")
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})
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it("should handle disabled apply model", async () => {
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const originalContent = "function test() { return 1; }"
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const changeDescription = "Add a comment to the function"
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const result = await strategy.applyDiff(originalContent, changeDescription)
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expect(result.success).toBe(false)
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if (!result.success) {
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expect(result.error).toContain("Apply model is not enabled")
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}
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})
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it("should handle array-based diff content", async () => {
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const originalContent = "function test() { return 1; }"
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const diffItems = [
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{ content: "Add a comment to the function", startLine: 1 },
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{ content: "Add error handling", startLine: 2 },
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]
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const result = await strategy.applyDiff(originalContent, diffItems)
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expect(result.success).toBe(false)
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if (!result.success) {
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expect(result.error).toContain("Apply model is not enabled")
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}
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})
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it("should return progress status", () => {
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const toolUse = {
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type: "tool_use" as const,
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name: "apply_diff" as const,
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params: { diff: "test changes" },
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partial: false,
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}
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const status = strategy.getProgressStatus(toolUse)
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expect(status).toHaveProperty("icon", "wand")
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})
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it("should handle partial tool use", () => {
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const toolUse = {
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type: "tool_use" as const,
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name: "apply_diff" as const,
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params: { diff: "test changes" },
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partial: true,
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}
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const status = strategy.getProgressStatus(toolUse)
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expect(status).toHaveProperty("icon", "wand")
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expect(status).toHaveProperty("text", "Analyzing...")
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})
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it("should handle successful result", () => {
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const toolUse = {
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type: "tool_use" as const,
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name: "apply_diff" as const,
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params: { diff: "test changes" },
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partial: false,
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}
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const result = { success: true as const, content: "modified content" }
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const status = strategy.getProgressStatus(toolUse, result)
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expect(status).toHaveProperty("text", "Applied")
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})
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it("should handle failed result", () => {
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const toolUse = {
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type: "tool_use" as const,
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name: "apply_diff" as const,
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params: { diff: "test changes" },
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partial: false,
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}
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const result = { success: false as const, error: "test error" }
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const status = strategy.getProgressStatus(toolUse, result)
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expect(status).toHaveProperty("text", "Failed")
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})
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})

‎src/core/diff/strategies/apply-model-diff-strategy.ts‎

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import { ToolProgressStatus } from "@roo-code/types"
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import { ToolUse, DiffStrategy, DiffResult, DiffItem } from "../../../shared/tools"
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import { Task } from "../../task/Task"
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import { ProviderSettings } from "@roo-code/types"
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/**
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* ApplyModelDiffStrategy uses a separate "apply" model to generate and apply diffs
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* instead of having the main chat model generate the diff format.
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* This reduces token consumption and improves reliability for file edits.
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*/
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export class ApplyModelDiffStrategy implements DiffStrategy {
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private task: Task
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private fuzzyThreshold: number
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constructor(task: Task, fuzzyThreshold?: number) {
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this.task = task
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this.fuzzyThreshold = fuzzyThreshold ?? 1.0
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}
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getName(): string {
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return "ApplyModel"
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}
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getToolDescription(args: { cwd: string; toolOptions?: { [key: string]: string } }): string {
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return `## apply_diff
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Description: Request to apply targeted modifications to an existing file using an AI-powered apply model. This tool uses a separate specialized model to understand your intent and apply changes directly to the file content, reducing the need for precise diff formatting and improving reliability.
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The apply model will analyze the original file content and your change description to generate the appropriate modifications automatically.
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Parameters:
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- path: (required) The path of the file to modify (relative to the current workspace directory ${args.cwd})
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- changes: (required) A description of the changes you want to make to the file. Be specific about what you want to change, add, or remove.
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Usage:
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<apply_diff>
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<path>File path here</path>
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<changes>
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Describe the changes you want to make to the file. For example:
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- "Add a new function called calculateTotal that takes an array of numbers and returns their sum"
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- "Update the existing validateUser function to also check for email format"
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- "Remove the deprecated legacy_function and replace its usage with new_function"
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- "Add error handling to the database connection code"
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</changes>
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</apply_diff>
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Example:
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<apply_diff>
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<path>src/utils.ts</path>
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<changes>
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Add a new function called formatCurrency that takes a number and returns a formatted currency string with dollar sign and two decimal places. Place it after the existing formatDate function.
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</changes>
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</apply_diff>`
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}
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async applyDiff(
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originalContent: string,
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diffContent: string | DiffItem[],
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_paramStartLine?: number,
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_paramEndLine?: number,
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): Promise<DiffResult> {
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// Handle array-based input (from multi-file operations)
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if (Array.isArray(diffContent)) {
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// For array input, combine all change descriptions
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const combinedChanges = diffContent.map(item => item.content).join('\n\n')
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return this.applyChangesWithModel(originalContent, combinedChanges)
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}
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// Handle string-based input (legacy and single operations)
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return this.applyChangesWithModel(originalContent, diffContent)
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}
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private async applyChangesWithModel(originalContent: string, changeDescription: string): Promise<DiffResult> {
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try {
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// Get apply model configuration from task settings
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const applyModelConfig = this.getApplyModelConfig()
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if (!applyModelConfig.enabled) {
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return {
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success: false,
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error: "Apply model is not enabled. Please configure an apply model in settings."
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}
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}
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// Create a prompt for the apply model
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const prompt = this.createApplyPrompt(originalContent, changeDescription)
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// Call the apply model to generate the modified content
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const modifiedContent = await this.callApplyModel(prompt, applyModelConfig)
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// Validate that the content was actually changed
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if (modifiedContent === originalContent) {
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return {
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success: false,
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error: "Apply model returned unchanged content. The requested changes may not be applicable or clear enough."
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}
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}
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return {
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success: true,
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content: modifiedContent
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}
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} catch (error) {
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return {
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success: false,
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error: `Apply model failed: ${error instanceof Error ? error.message : String(error)}`
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}
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}
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}
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private getApplyModelConfig() {
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// Get apply model configuration from task's provider settings
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// For now, we'll use a placeholder implementation
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// In the full implementation, this would access the provider settings
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return {
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enabled: false, // Will be updated when provider integration is complete
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provider: undefined,
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modelId: undefined,
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apiKey: undefined,
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baseUrl: undefined,
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temperature: 0.1, // Low temperature for consistent edits
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}
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}
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private createApplyPrompt(originalContent: string, changeDescription: string): string {
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return `You are an expert code editor. Your task is to apply the requested changes to the provided file content.
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IMPORTANT INSTRUCTIONS:
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1. Apply ONLY the changes described in the change request
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2. Preserve all existing code structure, formatting, and style
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3. Do not add comments about what you changed
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4. Return the complete modified file content
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5. If the change cannot be applied, return the original content unchanged
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ORIGINAL FILE CONTENT:
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\`\`\`
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${originalContent}
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\`\`\`
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REQUESTED CHANGES:
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${changeDescription}
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MODIFIED FILE CONTENT:`
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}
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private async callApplyModel(prompt: string, config: any): Promise<string> {
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// This is a simplified implementation. In a real implementation, you would:
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// 1. Create an API client for the specified provider
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// 2. Make the API call with the prompt
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// 3. Parse and return the response
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// For now, we'll throw an error to indicate this needs to be implemented
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throw new Error("Apply model API integration not yet implemented. This feature requires connecting to external apply models like Morph Fast Apply or Relace's Instant Apply.")
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}
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getProgressStatus(toolUse: ToolUse, result?: DiffResult): ToolProgressStatus {
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const changes = toolUse.params.diff // Use 'diff' parameter which exists in the ToolUse interface
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if (changes) {
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const icon = "wand"
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if (toolUse.partial) {
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return { icon, text: "Analyzing..." }
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} else if (result) {
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if (result.success) {
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return { icon, text: "Applied" }
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} else {
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return { icon, text: "Failed" }
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}
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}
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}
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return {}
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}
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}

‎src/core/task/Task.ts‎

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@@ -76,6 +76,7 @@ import { truncateConversationIfNeeded } from "../sliding-window"
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import { ClineProvider } from "../webview/ClineProvider"
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import { MultiSearchReplaceDiffStrategy } from "../diff/strategies/multi-search-replace"
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import { MultiFileSearchReplaceDiffStrategy } from "../diff/strategies/multi-file-search-replace"
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import { ApplyModelDiffStrategy } from "../diff/strategies/apply-model-diff-strategy"
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import { readApiMessages, saveApiMessages, readTaskMessages, saveTaskMessages, taskMetadata } from "../task-persistence"
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import { getEnvironmentDetails } from "../environment/getEnvironmentDetails"
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import {
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// Check experiment asynchronously and update strategy if needed
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provider.getState().then((state) => {
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const isMultiFileApplyDiffEnabled = experiments.isEnabled(
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state.experiments ?? {},
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EXPERIMENT_IDS.MULTI_FILE_APPLY_DIFF,
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)
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// Check if apply model is enabled first
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if (apiConfiguration.applyModelEnabled) {
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this.diffStrategy = new ApplyModelDiffStrategy(this, this.fuzzyMatchThreshold)
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} else {
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const isMultiFileApplyDiffEnabled = experiments.isEnabled(
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state.experiments ?? {},
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EXPERIMENT_IDS.MULTI_FILE_APPLY_DIFF,
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)
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288-
if (isMultiFileApplyDiffEnabled) {
289-
this.diffStrategy = new MultiFileSearchReplaceDiffStrategy(this.fuzzyMatchThreshold)
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if (isMultiFileApplyDiffEnabled) {
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this.diffStrategy = new MultiFileSearchReplaceDiffStrategy(this.fuzzyMatchThreshold)
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}
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}
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})
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}

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