docs: clarify apply_diff tool descriptions to emphasize surgical edits

- Updated multi-file-search-replace.ts to emphasize PRECISE, TARGETED modifications
- Updated multi-search-replace.ts with similar clarification
- Updated rules.ts to describe apply_diff as for 'surgical edits - targeted changes'
- Fixed bedrock.ts TypeScript error by using credentials instead of token
- Updated bedrock-reasoning test to match new credentials structure
- Updated snapshots

These changes help users understand that apply_diff is for specific code modifications, not broad rewrites

Author: hannesrudolph

src/api/providers/__tests__/bedrock-reasoning.spec.ts

@@ -313,7 +313,11 @@ describe("AwsBedrockHandler - Extended Thinking", () => {
 			expect(BedrockRuntimeClient).toHaveBeenCalledWith(
 				expect.objectContaining({
 					region: "us-east-1",
-					token: { token: "test-api-key-token" },
+					credentials: {
+						accessKeyId: "bedrock-user",
+						secretAccessKey: "bedrock-pwd",
+						sessionToken: "test-api-key-token",
+					},
 					authSchemePreference: ["httpBearerAuth"],
 				}),
 			)

src/api/providers/bedrock.ts

@@ -224,7 +224,11 @@ export class AwsBedrockHandler extends BaseProvider implements SingleCompletionH
 
 		if (this.options.awsUseApiKey && this.options.awsApiKey) {
 			// Use API key/token-based authentication if enabled and API key is set
-			clientConfig.token = { token: this.options.awsApiKey }
+			clientConfig.credentials = {
+				accessKeyId: "bedrock-user",
+				secretAccessKey: "bedrock-pwd",
+				sessionToken: this.options.awsApiKey,
+			}
 			clientConfig.authSchemePreference = ["httpBearerAuth"] // Otherwise there's no end of credential problems.
 		} else if (this.options.awsUseProfile && this.options.awsProfile) {
 			// Use profile-based credentials if enabled and profile is set

src/core/diff/strategies/multi-file-search-replace.ts

@@ -93,7 +93,7 @@ export class MultiFileSearchReplaceDiffStrategy implements DiffStrategy {
 	getToolDescription(args: { cwd: string; toolOptions?: { [key: string]: string } }): string {
 		return `## apply_diff
 
-Description: Request to apply targeted modifications to one or more files by searching for specific sections of content and replacing them. This tool supports both single-file and multi-file operations, allowing you to make changes across multiple files in a single request.
+Description: Request to apply PRECISE, TARGETED modifications to one or more files by searching for specific sections of content and replacing them. This tool is for SURGICAL EDITS ONLY - specific changes to existing code. This tool supports both single-file and multi-file operations, allowing you to make changes across multiple files in a single request.
 
 **IMPORTANT: You MUST use multiple files in a single operation whenever possible to maximize efficiency and minimize back-and-forth.**
 

src/core/diff/strategies/multi-search-replace.ts

@@ -92,7 +92,7 @@ export class MultiSearchReplaceDiffStrategy implements DiffStrategy {
 
 	getToolDescription(args: { cwd: string; toolOptions?: { [key: string]: string } }): string {
 		return `## apply_diff
-Description: Request to apply targeted modifications to an existing file by searching for specific sections of content and replacing them. This tool is ideal for precise, surgical edits when you know the exact content to change. It helps maintain proper indentation and formatting.
+Description: Request to apply PRECISE, TARGETED modifications to an existing file by searching for specific sections of content and replacing them. This tool is for SURGICAL EDITS ONLY - specific changes to existing code.
 You can perform multiple distinct search and replace operations within a single \`apply_diff\` call by providing multiple SEARCH/REPLACE blocks in the \`diff\` parameter. This is the preferred way to make several targeted changes efficiently.
 The SEARCH section must exactly match existing content including whitespace and indentation.
 If you're not confident in the exact content to search for, use the read_file tool first to get the exact content.

src/core/prompts/__tests__/__snapshots__/system-prompt/with-diff-enabled-true.snap

@@ -8,7 +8,7 @@ function getEditingInstructions(diffStrategy?: DiffStrategy): string {
 	// Collect available editing tools
 	if (diffStrategy) {
 		availableTools.push(
-			"apply_diff (for replacing lines in existing files)",
+			"apply_diff (for surgical edits - targeted changes to specific lines or functions)",
 			"write_to_file (for creating new files or complete file rewrites)",
 		)
 	} else {