Summary The Marker.io MCP server currently supports writing assignees via issue_update_assignee , but the read endpoints ( issues_list and issue_get ) don't return assignee data. Only reporter is exposed. This makes a common workflow impossible from an AI assistant: "show me the tickets assigned to me." Current behavior - issues_list fields enum: id, markerId, title, description, status, priority, url, reporter, createdAt, updatedAt - issue_get fields enum: same as above plus platform, comments, context, attachments - No assignee option in either. Requested behavior 1. Add assignee to the fields enum on both issues_list and issue_get . Shape should mirror reporter — { id, name, email } (or array of those, if multi-assignee is supported). 2. Add an assigneeId filter parameter to issues_list so clients can fetch "issues assigned to user X" in a single call rather than paging the whole project and filtering client-side. Why this matters - The write side already exists ( issue_update_assignee ), so the data model supports it — this is an asymmetry between read and write surfaces. - For agent / MCP use, "what's on my plate" is the single most common query against an issue tracker. Without assignee on read, every assistant has to ask the user to manually identify their own tickets.