+------------------+ | Back To Browsing | +------------------+ | [](#) | +------------------+ +----------------------------------------------------------------------------------------------------------------+ | Breadcrumbs | +----------------------------------------------------------------------------------------------------------------+ | [Documentation](/en/docs)[Marketo Engage](/en/docs/marketo-engage)[Marketo Guide](/en/docs/marketo/using/home) | +----------------------------------------------------------------------------------------------------------------+ # Release Notes: August 2026 :headding-anchor: release-notes-aug-26 +-------------------------------+ | Article Metadata | +-------------------------------+ | Last update: October 15, 2026 | +-------------------------------+ +-------------------------+ | Article Metadata Topics | +-------------------------+ | - Topics: | | - [Resources](#) | +-------------------------+ Below you’ll find all the features included in the August '26 release. Check your Adobe Marketo Engage edition for feature availability. The Release Notes specifically for Adobe Dynamic Chat [can be found here](/en/docs/marketo/using/release-notes/dynamic-chat#_blank). ## Standard Release Cycle Features :headding-anchor: standard-release-cycle-features The following features fall under the standard release cycle and will start to be released on **August 14, 2026**, with a phased rollout of remaining features over the subsequent weeks. Release features and dates are subject to change. Please check next to each feature for its status. +-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table (0 row 3, 1 row 3, 2 row 3, 3 row 3, 4 row 3, 5 row 3, 6 row 3, 7 row 3, layout auto, html authored) | +---------------------------------------+--------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Feature | Status | Documentation | +---------------------------------------+--------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+ | **Marketo Engage New UI**: The | Phased rollout throughout August and | *n/a* | | Marketo Engage interface has a | September | | | refreshed look, including updated | | | | menus, icons, and layout for a | | | | cleaner, more modern experience. This | | | | is a visual update only; no existing | | | | functionality or workflows are | | | | affected. | | | +---------------------------------------+--------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+ | | | | +---------------------------------------+--------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+ | **Marketo Engage MCP Server**: The | Generally Available | [Marketo MCP Server](/en/docs/marketo-developer/marketo/mcp-server#_blank) | | Marketo Engage MCP server acts as a | | | | bridge between your AI assistant and | | | | Marketo Engage. It exposes more than | | | | 100 operations across forms, | | | | programs, smart campaigns, | | | | people/leads, emails, snippets, | | | | lists, and folders. | | | +---------------------------------------+--------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+ | | | | +---------------------------------------+--------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+ | **Disable Campaigns on Archive**: | Released | [Disable Campaigns on Archive](/en/docs/marketo/using/product-docs/core-marketo-concepts/miscellaneous/understanding-folders#disable-campaigns-archive#_blank) | | Archiving a folder now disables and | | | | deschedules all campaigns in that | | | | folder tree, preventing unexpected | | | | execution of archived Smart | | | | Campaigns. | | | +---------------------------------------+--------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+ | | | | +---------------------------------------+--------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+ | **Email Designer - Generate Content | *Coming soon* | *Coming soon* | | Contextual Menu**: The "Generate | | | | content" features of the Email | | | | Designer can now be accessed from the | | | | contextual menu (the black bar). For | | | | example, when you select text | | | | content, the Generate content icon | | | | appears on the contextual menu, | | | | allowing you to perform quick | | | | actions. | | | +---------------------------------------+--------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+ --- ## Announcements :headding-anchor: announcements +--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | List | +--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | - **Marketo AI is now Coworker for Marketo Engage**: Coworker for Marketo Engage provides agent skills designed to automate time-consuming marketing functions. New name, same features, available to all users. [Learn more](/en/docs/marketo/using/product-docs/coworker-for-marketo/overview#_blank) | | | | - **REST API ‘access\_token’ Parameter Deprecation**: The `access_token` query parameter used to authenticate Marketo REST API calls is being deprecated and will not be available after August 31, | | 2026\. All new and existing integrations should authenticate REST API calls using the ‘Authorization’ header, [as described here](/en/docs/marketo-developer/marketo/rest/authentication#_blank). | | | | - **REST API Campaign Run ID**: Under certain circumstances, the Campaign Run ID value of an activity was sometimes returned with incorrect formatting, between two pairs of quotation marks (for example, `"campaignRunId": ""102938""`).\ | | Beginning with the August release, this value will always be returned with the correct numerical format (`"campaignRunId": 102938`) | | | | - **Static List Size Limits for Get Lead Activities and Get Lead Changes**: Beginning September 30, 2026, calls to the Get Lead Activities or Get Lead Changes endpoints which include the `listId` parameter will fail with a 1003 Error Code (indicating that the target static list has too many records) if the target lists contain 10,000 or more leads. Consult the [Migration Guide](/en/docs/marketo-developer/marketo/rest/lead-database/migration#_blank) for additional information. | | | | - **REST API Merge Leads limit**: As of July 31, 2026, calls that include more than 25 IDs in the leadIds parameter of a Merge Leads API call result in a 1080 error code, and the call is skipped. | | Jobs requiring the merger of more than 25 records into one should be split into multiple jobs to ensure the success of those calls. | +--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ +-----------------------------------+ | 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