Both servers are official
Roam Research maintains roam-tools, a package with read and write operations authorized by graph tokens approved in the desktop app. Community servers provide additional integration choices.
Hjarni's server is hosted and connects over OAuth. Supported web and mobile assistant clients do not need your desktop app to be running. A Roam local server can serve an AI client on the machine where it runs; using it from a remote-only client requires additional infrastructure.
Guidance and permissions
Roam documents graph access levels and a graph guidelines page for agents. Hjarni offers instructions per folder and manually created tokens scoped to folders or spaces, with read/write permissions. OAuth uses your account's permissions by default; at sign-in or in Settings > Connections, you can limit access to selected folders, make it read-only, or both. Follow the folder-access walkthrough to check the boundary.
Instructions in either product guide behavior. Permission settings determine access. Neither connection guarantees that an assistant will retrieve the right context on every prompt.
Graph thinking or Markdown folders
Roam's block references, queries, and daily notes support a networked outliner workflow. Hjarni keeps documents in folders with tags and shared team access. A research synthesis is possible with connected assistants in either setup; the note model and connection setup differ.
Roam lists a 31-day trial and paid subscriptions. Hjarni Free includes 25 personal notes with MCP access. Block references and graph queries do not map directly to Hjarni's document model. Try a small sample before moving a graph.