first commit

pigo/internal/agentcore/progress_ctx.go

@@ -0,0 +1,22 @@
+package agentcore
+
+import "context"
+
+// progressEmitterKey is the unexported context key under which a run-level
+// progress EmitFunc is stored.
+type progressEmitterKey struct{}
+
+// WithProgressEmitter returns a child context carrying emit as the run-level
+// progress emitter. The task tool injects the parent loop's EmitFunc here so a
+// dispatched sub-agent can surface SubAgentProgressEvent up the parent stream.
+func WithProgressEmitter(ctx context.Context, emit EmitFunc) context.Context {
+	return context.WithValue(ctx, progressEmitterKey{}, emit)
+}
+
+// ProgressEmitterFromContext returns the run-level progress emitter carried by
+// ctx, or nil if none was set (in which case callers should skip progress
+// reporting rather than panic).
+func ProgressEmitterFromContext(ctx context.Context) EmitFunc {
+	emit, _ := ctx.Value(progressEmitterKey{}).(EmitFunc)
+	return emit
+}