Proxy the unified diff of one workspace path live from the owning daemon. scope=staged compares the index against HEAD; the default unstaged compares the worktree against the index. Pass sessionId for an authorized isolated session worktree. A binary change (binary:true), a path with no changes (diff:null) and a from-scratch workspace (isRepo:false) are all data, not errors; the daemon bounds the text to the wire frame cap and reports truncated. 503 when unplaced or the daemon is offline. Pass repo (owner/repo) to address one of the agent’s authorized additional repositories instead of its primary workspace; an unauthorized name reads 404, and a daemon too old to scope by repository yields 409.