feat(plugin-mcp): add missing MCP built-in tools

docs/migration-guide/v4.mdx

@@ -891,7 +891,7 @@ createAPIKeyFields({
 
 The MCP plugin was refactored. The public config API, the built-in tool inputs, and the API key collection schema all changed. Update your plugin config and delete + recreate any existing API keys.
 
-**Collections and globals are now opt-out.** Drop the `enabled` flag. Every collection and global is exposed by default through the generic built-in tools (`getConfigInfo`, `getCollectionSchema`, `findDocuments`, `createDocument`, `updateDocument`, `deleteDocuments`, plus `getGlobalSchema`, `findGlobal`, and `updateGlobal` for globals). Turn individual operations off via simple config keys like `tools: { create: false }`.
+**Collections and globals are now opt-out.** Drop the `enabled` flag. Every collection and global is exposed by default through the generic built-in tools. For collections, this includes tools like `getCollectionSchema`, `findDocuments`, `countDocuments`, `createDocument`, `updateDocument`, `deleteDocuments`, `duplicateDocument`, and `findDistinct`, plus version tools when versions are enabled. For globals, this includes `getGlobalSchema`, `findGlobal`, and `updateGlobal`, plus version tools when versions are enabled. Turn individual operations off via simple config keys like `tools: { create: false }`.
 
 ```diff
 mcpPlugin({

packages/plugin-mcp/src/mcp/builtin/collections/countTool.ts

@@ -0,0 +1,71 @@
+import { z } from 'zod'
+
+import { defineCollectionTool } from '../../../defineTool.js'
+import { getLogger } from '../../../utils/getLogger.js'
+import { localAPIDefaults } from '../../../utils/localAPIDefaults.js'
+import { whereSchema } from '../../../utils/whereSchema.js'
+
+const DEFAULT_DESCRIPTION =
+  'Count documents in any collection by passing the collection slug and optional where clause.'
+
+export const countDocumentsTool = defineCollectionTool({
+  annotations: {
+    destructiveHint: false,
+    idempotentHint: true,
+    openWorldHint: false,
+    readOnlyHint: true,
+    title: 'Count Documents',
+  },
+  description: DEFAULT_DESCRIPTION,
+  input: z.object({
+    locale: z.string().describe('Optional: locale code to count documents in').optional(),
+    trash: z
+      .boolean()
+      .describe('Optional: include soft-deleted documents when trash is enabled on the collection')
+      .optional(),
+    where: whereSchema
+      .describe(
+        'Optional: where clause for filtering. Use field names with Payload operators, and/or arrays for grouping. Example: {"title":{"contains":"test"}}',
+      )
+      .optional(),
+  }),
+}).handler(async ({ authorizedMCP, collectionSlug, input, req }) => {
+  const payload = req.payload
+  const logger = getLogger({ payload })
+  const { locale, trash, where } = input
+
+  logger.info(`Counting documents in collection: ${collectionSlug}`)
+
+  try {
+    const result = await payload.count({
+      collection: collectionSlug,
+      req,
+      ...localAPIDefaults(authorizedMCP),
+      ...(locale ? { locale } : {}),
+      ...(trash !== undefined ? { trash } : {}),
+      ...(where ? { where } : {}),
+    })
+
+    return {
+      content: [
+        {
+          type: 'text',
+          text: `Collection "${collectionSlug}" contains ${result.totalDocs} matching documents.\n\`\`\`json\n${JSON.stringify(result)}\n\`\`\``,
+        },
+      ],
+      doc: result,
+    }
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : 'Unknown error'
+    logger.error(`Error counting documents in ${collectionSlug}: ${errorMessage}`)
+    return {
+      content: [
+        {
+          type: 'text',
+          text: `❌ **Error counting documents in collection "${collectionSlug}":** ${errorMessage}`,
+        },
+      ],
+      isError: true,
+    }
+  }
+})

packages/plugin-mcp/src/mcp/builtin/collections/countVersionsTool.ts

@@ -0,0 +1,69 @@
+import { z } from 'zod'
+
+import { defineCollectionTool } from '../../../defineTool.js'
+import { getLogger } from '../../../utils/getLogger.js'
+import { localAPIDefaults } from '../../../utils/localAPIDefaults.js'
+import { whereSchema } from '../../../utils/whereSchema.js'
+
+const DEFAULT_DESCRIPTION =
+  'Count document versions in any version-enabled collection by passing the collection slug and optional where clause.'
+
+export const countVersionsTool = defineCollectionTool({
+  annotations: {
+    destructiveHint: false,
+    idempotentHint: true,
+    openWorldHint: false,
+    readOnlyHint: true,
+    title: 'Count Versions',
+  },
+  description: DEFAULT_DESCRIPTION,
+  input: z.object({
+    locale: z
+      .string()
+      .describe('Optional: locale code to count versions in')
+      .optional(),
+    where: whereSchema
+      .describe(
+        'Optional: where clause for filtering versions. Version document fields are usually under "version". Example: {"version.title":{"contains":"test"}}',
+      )
+      .optional(),
+  }),
+}).handler(async ({ authorizedMCP, collectionSlug, input, req }) => {
+  const payload = req.payload
+  const logger = getLogger({ payload })
+  const { locale, where } = input
+
+  logger.info(`Counting versions in collection: ${collectionSlug}`)
+
+  try {
+    const result = await payload.countVersions({
+      collection: collectionSlug,
+      req,
+      ...localAPIDefaults(authorizedMCP),
+      ...(locale ? { locale } : {}),
+      ...(where ? { where } : {}),
+    })
+
+    return {
+      content: [
+        {
+          type: 'text',
+          text: `Collection "${collectionSlug}" contains ${result.totalDocs} matching versions.\n\`\`\`json\n${JSON.stringify(result)}\n\`\`\``,
+        },
+      ],
+      doc: result,
+    }
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : 'Unknown error'
+    logger.error(`Error counting versions in ${collectionSlug}: ${errorMessage}`)
+    return {
+      content: [
+        {
+          type: 'text',
+          text: `❌ **Error counting versions in collection "${collectionSlug}":** ${errorMessage}`,
+        },
+      ],
+      isError: true,
+    }
+  }
+})

packages/plugin-mcp/src/mcp/builtin/collections/duplicateTool.ts

@@ -0,0 +1,132 @@
+import type { PopulateType, SelectType } from 'payload'
+
+import { z } from 'zod'
+
+import { defineCollectionTool } from '../../../defineTool.js'
+import { getLogger } from '../../../utils/getLogger.js'
+import {
+  getCollectionVirtualFieldNames,
+  stripVirtualFields,
+} from '../../../utils/getVirtualFieldNames.js'
+import { localAPIDefaults } from '../../../utils/localAPIDefaults.js'
+import { transformPointDataToPayload } from '../../../utils/transformPointDataToPayload.js'
+import { formatCollectionError } from './formatCollectionError.js'
+
+const DEFAULT_DESCRIPTION =
+  'Duplicate a document in any collection by passing the collection slug and source document ID.'
+
+export const duplicateDocumentTool = defineCollectionTool({
+  annotations: {
+    destructiveHint: false,
+    idempotentHint: false,
+    openWorldHint: false,
+    readOnlyHint: false,
+    title: 'Duplicate Document',
+  },
+  description: DEFAULT_DESCRIPTION,
+  input: z.object({
+    id: z.union([z.string(), z.number()]).describe('The ID of the document to duplicate'),
+    data: z
+      .record(z.string(), z.unknown())
+      .describe('Optional: fields to override on the duplicated document')
+      .optional(),
+    depth: z
+      .number()
+      .int()
+      .min(0)
+      .max(10)
+      .describe('How many levels deep to populate relationships in response')
+      .optional()
+      .default(0),
+    draft: z
+      .boolean()
+      .describe('Whether to create the duplicate as a draft')
+      .optional()
+      .default(false),
+    fallbackLocale: z
+      .string()
+      .describe('Optional: fallback locale code to use when requested locale is not available')
+      .optional(),
+    locale: z
+      .string()
+      .describe(
+        'Optional: locale code to duplicate in (e.g., "en", "es"). Defaults to the default locale',
+      )
+      .optional(),
+    populate: z
+      .record(z.string(), z.unknown())
+      .describe(
+        'Optional: control which fields to include from populated relationship or upload documents.',
+      )
+      .optional(),
+    select: z
+      .record(z.string(), z.unknown())
+      .describe(
+        'Optional: define exactly which fields you\'d like to return in the response, e.g., {"title": true}',
+      )
+      .optional(),
+    selectedLocales: z
+      .array(z.string())
+      .describe('Optional: localized field locales to include in the duplicated document')
+      .optional(),
+    showHiddenFields: z
+      .boolean()
+      .describe('Optional: include hidden fields in the duplicated document response')
+      .optional(),
+  }),
+}).handler(async ({ authorizedMCP, collectionSlug, input, req }) => {
+  const payload = req.payload
+  const logger = getLogger({ payload })
+  const {
+    id,
+    data,
+    depth,
+    draft,
+    fallbackLocale,
+    locale,
+    populate,
+    select,
+    selectedLocales,
+    showHiddenFields,
+  } = input
+
+  logger.info(`Duplicating document in collection: ${collectionSlug} with ID: ${id}`)
+
+  try {
+    const virtualFieldNames = getCollectionVirtualFieldNames(payload.config, collectionSlug)
+    const inputData = data ? stripVirtualFields(data, virtualFieldNames) : undefined
+    const parsedData = inputData ? transformPointDataToPayload(inputData) : undefined
+
+    const result = await payload.duplicate({
+      id,
+      collection: collectionSlug,
+      depth,
+      draft,
+      req,
+      ...localAPIDefaults(authorizedMCP),
+      ...(parsedData ? { data: parsedData } : {}),
+      ...(locale ? { locale } : {}),
+      ...(fallbackLocale ? { fallbackLocale } : {}),
+      ...(populate ? { populate: populate as PopulateType } : {}),
+      ...(select ? { select: select as SelectType } : {}),
+      ...(selectedLocales ? { selectedLocales } : {}),
+      ...(showHiddenFields !== undefined ? { showHiddenFields } : {}),
+    })
+
+    logger.info(`Successfully duplicated document in ${collectionSlug} from ID: ${id}`)
+
+    return {
+      content: [
+        {
+          type: 'text',
+          text: `Document duplicated successfully in collection "${collectionSlug}"!\nDuplicated document:\n\`\`\`json\n${JSON.stringify(result)}\n\`\`\``,
+        },
+      ],
+      doc: result as Record<string, unknown>,
+    }
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : 'Unknown error'
+    logger.error(`Error duplicating document in ${collectionSlug}: ${errorMessage}`)
+    return formatCollectionError({ action: 'duplicating', collectionSlug, error, req })
+  }
+})