fix: update diff-mcp for MCP SDK 1.29 and Zod 4 compatibility

Author: benjamine

package-lock.json

@@ -31,7 +31,7 @@
 		"json5": "^2.2.3",
 		"jsondiffpatch": "^0.7.4",
 		"smol-toml": "^1.3.1",
-		"zod": "^3.24.2"
+		"zod": "^4.4.3"
 	},
 	"devDependencies": {
 		"@types/js-yaml": "^4.0.9",

packages/diff-mcp/package.json

@@ -14,40 +14,34 @@ export const createMcpServer = () => {
 	const server = new McpServer({
 		name: "diff-mcp",
 		version: "0.0.1",
-		capabilities: {
-			resources: {},
-			tools: {},
-		},
 	});
 
 	server.tool(
 		"diff",
 		"compare text or data and get a readable diff",
 		{
-			state: z.object({
-				left: inputDataSchema.describe("The left side of the diff."),
-				leftFormat: formatSchema
-					.optional()
-					.describe("format of left side of the diff"),
-				right: inputDataSchema.describe(
-					"The right side of the diff (to compare with the left side).",
-				),
-				rightFormat: formatSchema
-					.optional()
-					.describe("format of right side of the diff"),
-				outputFormat: z
-					.enum(["text", "json", "jsonpatch"])
-					.default("text")
-					.describe(
-						"The output format. " +
-							"text: (default) human readable text diff, " +
-							"json: a compact json diff (jsondiffpatch delta format), " +
-							"jsonpatch: json patch diff (RFC 6902)",
-					)
-					.optional(),
-			}),
+			left: inputDataSchema.describe("The left side of the diff."),
+			leftFormat: formatSchema
+				.optional()
+				.describe("format of left side of the diff"),
+			right: inputDataSchema.describe(
+				"The right side of the diff (to compare with the left side).",
+			),
+			rightFormat: formatSchema
+				.optional()
+				.describe("format of right side of the diff"),
+			outputFormat: z
+				.enum(["text", "json", "jsonpatch"])
+				.default("text")
+				.describe(
+					"The output format. " +
+						"text: (default) human readable text diff, " +
+						"json: a compact json diff (jsondiffpatch delta format), " +
+						"jsonpatch: json patch diff (RFC 6902)",
+				)
+				.optional(),
 		},
-		({ state }) => {
+		(state) => {
 			try {
 				const jsondiffpatch = create({
 					textDiff: {

packages/diff-mcp/src/server.ts

@@ -3,13 +3,9 @@
 	"version": "0.7.4",
 	"author": "Benjamin Eidelman <beneidel@gmail.com>",
 	"description": "JSON diff & patch (object and array diff, text diff, multiple output formats)",
-	"contributors": [
-		"Benjamin Eidelman <beneidel@gmail.com>"
-	],
+	"contributors": ["Benjamin Eidelman <beneidel@gmail.com>"],
 	"type": "module",
-	"sideEffects": [
-		"*.css"
-	],
+	"sideEffects": ["*.css"],
 	"main": "./lib/index.js",
 	"types": "./lib/index.d.ts",
 	"exports": {
@@ -18,10 +14,7 @@
 		"./formatters/*": "./lib/formatters/*.js",
 		"./formatters/styles/*.css": "./lib/formatters/styles/*.css"
 	},
-	"files": [
-		"bin",
-		"lib"
-	],
+	"files": ["bin", "lib"],
 	"bin": {
 		"jsondiffpatch": "./bin/jsondiffpatch.js"
 	},
@@ -37,11 +30,7 @@
 		"type": "git",
 		"url": "https://github.com/benjamine/jsondiffpatch.git"
 	},
-	"keywords": [
-		"json",
-		"diff",
-		"patch"
-	],
+	"keywords": ["json", "diff", "patch"],
 	"dependencies": {
 		"@dmsnell/diff-match-patch": "^1.1.0"
 	},