MCP Changelog

Fixes:

• assets_create_upload tells agents what to do when an upload fails, so they stop requesting new upload links over and over

Improvements:

• Internal changes only. No change to tools

Improvements:

• workflows_get returns the workflow’s full step tree as JSON

Changes:

• The SuprSend MCP server is out of beta

Improvements:

• templates_validate returns validation warnings, and resolves mock data the same way a publish does. Without mock_data, it uses the template’s saved mock data

New:

• broadcasts_trigger takes precompute for scheduled broadcasts: SuprSend prepares the audience, preferences and messages up to 2 hours before the send, so a time-critical broadcast goes out on schedule

Fixes:

• Template mock data keeps its recipient and actor IDs, and the tools say more clearly when they show the draft

Fixes:

• messages_get_content explains that a message sent moments ago may not have content yet

Improvements:

• workspaces_list can search by name or slug, pages through results, and returns the total count
• Faster connections for accounts with many workspaces: the server instructions show a sample of workspaces and the total, and each tool call checks access to its own workspace

Improvements:

• Connections scoped to one workspace connect without listing every workspace on the account

Improvements:

• The server’s registry entry links its repository, for the GitHub MCP Registry

Improvements:

• templates_upsert warns when the change removes channels from the draft

Improvements:

• Preference and subscription reads say clearly when the user doesn’t exist

Improvements:

• templates_upsert_variant merges your change into the variant’s existing content
• templates_upsert_variant refuses to edit an email body built in the drag-and-drop designer, so the design isn’t overwritten
• templates_get_variant leaves out the designer’s layout JSON

New:

• workflows_diff and templates_diff: show what changed between two versions, or between the draft and a version
• workflows_list_versions: list a workflow’s versions

Fixes:

• Server text refers to the docs search tool by its current name, docs_search

Improvements:

• Agent skills ship with the server, so docs_get_skill no longer depends on fetching them at runtime

New:

• data_user_properties_schema can search property names

Fixes:

• data_user_properties_schema reads paginated responses correctly
• users_set_preferences reports not-found errors correctly
• Security fixes in how message content is cleaned and masked

Improvements:

• Publishing a workflow or template with no changes answers “Nothing to publish”

Improvements:

• Every tool has a title and a read-only hint, as directories such as Claude’s require
• A wrong workspace input lists the workspaces you can use
• vendors_list_types returns each vendor type’s config schema and allowed values
• vendors_upsert checks the config against the vendor type’s schema before saving, and explains a refusal field by field
• workflows_save_draft and workflows_publish explain that a workflow needs a live preference category

New:

• First public release of the hosted SuprSend MCP server at https://mcp.suprsend.com/mcp. Sign in with your SuprSend account over OAuth; there’s nothing to install and no service token
• Workspaces in every region (US, EU and India) on one connection
• Tools for workspaces, users, objects, tenants, vendors, lists, broadcasts, workflows, events, schemas, templates, translations, preferences, messages, delivery data, assets, expressions and docs. See the tool list
• Your SuprSend role decides which tools you get: members get read tools, and admins also get write and send tools
• Four skills come with the connection: suprsend-semantic-layer, suprsend-template-schema, suprsend-workflow-schema and suprsend-docs-support. Clients without skill support read them with docs_get_skill
• Server instructions, built for each connection from its scope, tell the agent which tools to use and how
• In clients that support MCP Apps, data_query results show as charts and tables in the chat
• Channel secrets are masked in every tool result
• Listed in the official MCP Registry as com.suprsend/mcp