Add task sidebar workflow

internal/mcp/tools.go

@@ -60,6 +60,7 @@ type ToolHost interface {
 	// callers default to RoleOrchestrator (treated as a top-level peer)
 	// so they don't get silently denied.
 	CallerRole(processID string) CallerRole
+	CallerTask(processID string) (TaskInfo, bool)
 
 	// Lifecycle (SPEC §7).
 	SpawnAgent(callerID string, args SpawnAgentArgs) (ProcessInfo, error)
@@ -102,6 +103,7 @@ type ToolHost interface {
 	ScratchpadWrite(name, content, expectedRevision string) (revision string, err error)
 	ScratchpadAppend(name, content string) error
 	ScratchpadDelete(name string) error
+	RegisterTaskWorktree(callerID string, args TaskRegisterWorktreeArgs) (TaskInfo, error)
 
 	// Meta.
 	WhoAmI(callerID string, includeTools bool) WhoAmI
@@ -153,6 +155,7 @@ type Cursor struct {
 type ProjectStatus struct {
 	Project     ProjectMeta        `json:"project"`
 	Caller      WhoAmI             `json:"caller"`
+	Task        *TaskInfo          `json:"task,omitempty"`
 	Processes   []ProcessInfo      `json:"processes"`
 	Scratchpads []scratchpad.Entry `json:"scratchpads"`
 }
@@ -167,6 +170,26 @@ type ProjectMeta struct {
 	Key  string `json:"key"`
 }
 
+type TaskInfo struct {
+	ID        string         `json:"id"`
+	Title     string         `json:"title"`
+	CreatedAt string         `json:"created_at,omitempty"`
+	UpdatedAt string         `json:"updated_at,omitempty"`
+	Worktrees []TaskWorktree `json:"worktrees,omitempty"`
+}
+
+type TaskWorktree struct {
+	Path               string `json:"path"`
+	Branch             string `json:"branch,omitempty"`
+	CreatedByProcessID string `json:"created_by_process_id,omitempty"`
+	RegisteredAt       string `json:"registered_at,omitempty"`
+}
+
+type TaskRegisterWorktreeArgs struct {
+	Path   string `json:"path"`
+	Branch string `json:"branch,omitempty"`
+}
+
 // ProcessOutput is the get_process_output payload. By default it is
 // canonical text with light metadata; include_meta restores screen
 // geometry + version, and raw requests return stream bytes.
@@ -341,6 +364,7 @@ type WhoAmI struct {
 	Role            CallerRole  `json:"role"`
 	ParentProcessID string      `json:"parent_process_id,omitempty"`
 	Project         ProjectMeta `json:"project"`
+	Task            *TaskInfo   `json:"task,omitempty"`
 	AvailableTools  []string    `json:"available_tools"`
 }
 
@@ -836,6 +860,20 @@ func callTool(h ToolHost, callerID, method string, params json.RawMessage) (any,
 		}
 		return map[string]any{"ok": true}, 0, "", nil
 
+	case "task_register_worktree":
+		if _, ok := h.CallerTask(callerID); !ok {
+			return nil, codeRoleForbidden, "task_register_worktree: caller is not attached to a task", structuredKind(ErrorKindRoleForbidden)
+		}
+		var p TaskRegisterWorktreeArgs
+		if err := unmarshalParams(params, &p); err != nil {
+			return nil, codeInvalidParams, err.Error(), nil
+		}
+		if p.Path == "" {
+			return nil, codeInvalidParams, "task_register_worktree: path required", nil
+		}
+		info, err := h.RegisterTaskWorktree(callerID, p)
+		return mapToolResult(info, err)
+
 	case "whoami":
 		var p WhoAmIArgs
 		_ = unmarshalParamsOptional(params, &p)