Hermes's built-in MCP server exposes messages_send(target, message), but no edit/update tool. A bridge can send new messages; it cannot update them through that API. The edit feature request and its PR remain open.

External bridge: the MCP surface

The current hermes mcp serve interface includes:

Interface	Purpose
channels_list	Discover chat targets
conversations_list / conversation_get	Inspect conversations and routing context
messages_send(target, message)	Send a new platform message
events_poll / events_wait	Read conversation events

There is no exposed message-edit or stream-publish operation. The send engine can return a platform message ID, but that does not provide an update operation. Event-reading tools do not publish ACP updates into a chat.

Official MCP documentation Current MCP implementation Send engine

Issue #21859 requests an edit action. PR #25919 remains open; its review identifies changes needed for the current messaging architecture. It is not a ready, merged capability.

Checked documentation and source; no live chat test was performed.