feat: Dashboard workflow graph visualization with React Flow (#198)

Phase 1: API + static graph rendering Backend: - GET /workflows/:name now returns descriptor (with graph) from bundle YAML - Graceful fallback to null if YAML missing/invalid Frontend: - New workflow-graph/ component module (7 files) - React Flow + dagre auto-layout (TB direction) - Custom nodes: RoleNode (rounded rect) + TerminalNode (circle for START/END) - Custom edges: dashed for FALLBACK, solid with label for conditions - Self-loop edges supported (e.g. coder → coder) - Node states: default/completed/active with color-coded borders - Active node pulse animation - Collapsible graph panel (300px) above thread records - Dark theme using existing CSS variables Integration: - ThreadDetail extracts workflow name → fetches descriptor → computes node states → renders graph - Node states derived from ThreadRecord[] (completed/active/default)
2026-05-12 10:27:07 +08:00
parent 2c26be6ec6
commit 9cb7d68abe
12 changed files with 596 additions and 3 deletions
@@ -9,6 +9,8 @@
    "preview": "vite preview"
  },
  "dependencies": {
+    "@dagrejs/dagre": "^3.0.0",
+    "@xyflow/react": "^12.10.2",
    "react": "^19.2.6",
    "react-dom": "^19.2.6",
    "react-markdown": "^10.1.0",
@@ -104,6 +104,36 @@ export type WorkflowResultRecord = {

 export type ThreadRecord = ThreadStartRecord | RoleRecord | WorkflowResultRecord;

+export type WorkflowGraphEdge = {
+  from: string;
+  to: string;
+  condition: string;
+  conditionDescription: string | null;
+};
+
+export type WorkflowGraph = {
+  edges: readonly WorkflowGraphEdge[];
+};
+
+export type WorkflowRoleDescriptor = {
+  description: string;
+  schema: Record<string, unknown>;
+};
+
+export type WorkflowDescriptor = {
+  description: string;
+  roles: Record<string, WorkflowRoleDescriptor>;
+  graph: WorkflowGraph;
+};
+
+export type WorkflowDetail = {
+  name: string;
+  hash: string;
+  timestamp: number;
+  history: unknown[];
+  descriptor: WorkflowDescriptor | null;
+};
+
 // ── Gateway endpoints ───────────────────────────────────────────────

 export function listAgents(): Promise<AgentEndpoint[]> {
@@ -117,6 +147,15 @@ export function listWorkflows(agent: string): Promise<{ workflows: WorkflowSumma
  return fetchJson(agentBase(agent), "/workflows");
 }

+export function getWorkflowDescriptor(
+  agent: string,
+  name: string,
+): Promise<WorkflowDescriptor | null> {
+  return fetchJson<WorkflowDetail>(agentBase(agent), `/workflows/${encodeURIComponent(name)}`).then(
+    (res) => res.descriptor,
+  );
+}
+
 export function listThreads(agent: string): Promise<{ threads: ThreadSummary[] }> {
  return fetchJson(agentBase(agent), "/threads");
 }
@@ -1,8 +1,17 @@
-import { useEffect, useRef, useState } from "react";
-import { getThread, killThread, pauseThread, resumeThread } from "../api.ts";
+import { useEffect, useMemo, useRef, useState } from "react";
+import {
+  getThread,
+  getWorkflowDescriptor,
+  killThread,
+  pauseThread,
+  resumeThread,
+  type ThreadRecord,
+  type WorkflowDescriptor,
+} from "../api.ts";
 import { useFetch } from "../hooks.ts";
 import { useSSE } from "../use-sse.ts";
 import { RecordCard } from "./record-card.tsx";
+import { type NodeState, WorkflowGraph } from "./workflow-graph/index.ts";

 type Props = {
  agent: string;
@@ -10,6 +19,84 @@ type Props = {
  onBack: () => void;
 };

+function extractWorkflowName(records: readonly ThreadRecord[]): string | null {
+  for (const r of records) {
+    if (r.type === "thread-start") return r.workflow;
+  }
+  return null;
+}
+
+type GraphPanelProps = {
+  descriptor: WorkflowDescriptor;
+  workflowName: string | null;
+  nodeStates: Map<string, NodeState>;
+};
+
+function GraphPanel({ descriptor, workflowName, nodeStates }: GraphPanelProps) {
+  const [open, setOpen] = useState(true);
+  const edgeCount = descriptor.graph.edges.length;
+  return (
+    <div
+      className="mb-4 rounded-lg border overflow-hidden"
+      style={{ borderColor: "var(--color-border)", background: "var(--color-surface)" }}
+    >
+      <button
+        type="button"
+        onClick={() => setOpen((v) => !v)}
+        className="w-full flex items-center justify-between px-3 py-2 text-xs"
+        style={{ color: "var(--color-text-muted)" }}
+      >
+        <span className="font-mono">
+          {open ? "▼" : "▶"} Workflow graph
+          {workflowName !== null && (
+            <span className="ml-2" style={{ color: "var(--color-text)" }}>
+              {workflowName}
+            </span>
+          )}
+        </span>
+        <span>
+          {edgeCount} edge{edgeCount === 1 ? "" : "s"}
+        </span>
+      </button>
+      {open && (
+        <div style={{ height: 300, width: "100%" }}>
+          <WorkflowGraph
+            graph={descriptor.graph}
+            roles={descriptor.roles}
+            nodeStates={nodeStates}
+          />
+        </div>
+      )}
+    </div>
+  );
+}
+
+function computeNodeStates(records: readonly ThreadRecord[]): Map<string, NodeState> {
+  const states = new Map<string, NodeState>();
+  const roleRecords = records.filter(
+    (r): r is Extract<ThreadRecord, { type: "role" }> => r.type === "role",
+  );
+  const hasResult = records.some((r) => r.type === "workflow-result");
+
+  for (let i = 0; i < roleRecords.length; i++) {
+    const role = roleRecords[i].role;
+    const isLast = i === roleRecords.length - 1;
+    states.set(role, !hasResult && isLast ? "active" : "completed");
+  }
+
+  if (roleRecords.length > 0) {
+    states.set("__start__", "completed");
+  }
+  if (hasResult) {
+    states.set("__end__", "completed");
+    for (const [k, v] of states) {
+      if (v === "active") states.set(k, "completed");
+    }
+  }
+
+  return states;
+}
+
 export function ThreadDetail({ agent, threadId, onBack }: Props) {
  const sse = useSSE(agent, threadId);
  const { status, data, error } = useFetch(() => getThread(agent, threadId), [agent, threadId]);
@@ -23,6 +110,17 @@ export function ThreadDetail({ agent, threadId, onBack }: Props) {
      ? data.records
      : ([] as typeof sse.records);

+  const workflowName = useMemo(() => extractWorkflowName(records), [records]);
+
+  const descriptorFetch = useFetch<WorkflowDescriptor | null>(
+    () =>
+      workflowName === null ? Promise.resolve(null) : getWorkflowDescriptor(agent, workflowName),
+    [agent, workflowName],
+  );
+
+  const descriptor = descriptorFetch.status === "ok" ? descriptorFetch.data : null;
+  const nodeStates = useMemo(() => computeNodeStates(records), [records]);
+
  // biome-ignore lint/correctness/useExhaustiveDependencies: scroll when the rendered record list grows
  useEffect(() => {
    recordsEndRef.current?.scrollIntoView({ behavior: "smooth" });
@@ -95,6 +193,10 @@ export function ThreadDetail({ agent, threadId, onBack }: Props) {
        </p>
      )}

+      {descriptor !== null && descriptor.graph.edges.length > 0 && (
+        <GraphPanel descriptor={descriptor} workflowName={workflowName} nodeStates={nodeStates} />
+      )}
+
      {status === "loading" && !liveActive && records.length === 0 && (
        <p style={{ color: "var(--color-text-muted)" }}>Loading...</p>
      )}
@@ -0,0 +1,76 @@
+import {
+  BaseEdge,
+  EdgeLabelRenderer,
+  type EdgeProps,
+  getBezierPath,
+  getSmoothStepPath,
+} from "@xyflow/react";
+import type { ConditionEdgeData } from "./types.ts";
+
+export function ConditionEdge(props: EdgeProps) {
+  const {
+    id,
+    source,
+    target,
+    sourceX,
+    sourceY,
+    targetX,
+    targetY,
+    sourcePosition,
+    targetPosition,
+    data,
+    markerEnd,
+  } = props;
+  const edgeData = data as ConditionEdgeData | undefined;
+  const isFallback = edgeData?.isFallback ?? false;
+  const isSelfLoop = source === target;
+
+  const [path, labelX, labelY] = isSelfLoop
+    ? getSmoothStepPath({
+        sourceX,
+        sourceY,
+        targetX,
+        targetY,
+        sourcePosition,
+        targetPosition,
+        borderRadius: 20,
+      })
+    : getBezierPath({
+        sourceX,
+        sourceY,
+        targetX,
+        targetY,
+        sourcePosition,
+        targetPosition,
+      });
+
+  const stroke = isFallback ? "var(--color-text-muted)" : "var(--color-text)";
+  const strokeDasharray = isFallback ? "5 4" : undefined;
+
+  return (
+    <>
+      <BaseEdge
+        id={id}
+        path={path}
+        markerEnd={markerEnd}
+        style={{ stroke, strokeWidth: 1.5, strokeDasharray }}
+      />
+      {edgeData && !isFallback && edgeData.condition !== "" && (
+        <EdgeLabelRenderer>
+          <div
+            className="absolute px-1.5 py-0.5 rounded text-[10px] font-mono pointer-events-auto"
+            style={{
+              transform: `translate(-50%, -50%) translate(${labelX}px, ${labelY}px)`,
+              background: "var(--color-bg)",
+              border: "1px solid var(--color-border)",
+              color: "var(--color-text)",
+            }}
+            title={edgeData.conditionDescription ?? undefined}
+          >
+            {edgeData.condition}
+          </div>
+        </EdgeLabelRenderer>
+      )}
+    </>
+  );
+}
@@ -0,0 +1,2 @@
+export type { NodeState } from "./types.ts";
+export { WorkflowGraph } from "./workflow-graph.tsx";
@@ -0,0 +1,69 @@
+import { Handle, type NodeProps, Position } from "@xyflow/react";
+import type { RoleNodeData } from "./types.ts";
+
+function borderColor(state: RoleNodeData["state"]): string {
+  switch (state) {
+    case "completed":
+      return "var(--color-success)";
+    case "active":
+      return "var(--color-accent)";
+    default:
+      return "var(--color-border)";
+  }
+}
+
+function stateIcon(state: RoleNodeData["state"]): string | null {
+  if (state === "completed") return "✓";
+  if (state === "active") return "●";
+  return null;
+}
+
+export function RoleNode(props: NodeProps) {
+  const data = props.data as RoleNodeData;
+  const icon = stateIcon(data.state);
+  const isActive = data.state === "active";
+  const handleStyle = {
+    background: "var(--color-text-muted)",
+    width: 6,
+    height: 6,
+    border: "none",
+  } as const;
+
+  return (
+    <div
+      className={`px-3 py-2 rounded-md border-2 text-xs font-medium ${isActive ? "wf-node-pulse" : ""}`}
+      style={{
+        width: 180,
+        height: 60,
+        background: "var(--color-surface)",
+        borderColor: borderColor(data.state),
+        color: "var(--color-text)",
+        display: "flex",
+        flexDirection: "column",
+        justifyContent: "center",
+        boxSizing: "border-box",
+      }}
+      title={data.description}
+    >
+      <Handle type="target" position={Position.Top} style={handleStyle} isConnectable={false} />
+      <div className="flex items-center gap-1.5 font-mono">
+        {icon !== null && (
+          <span
+            style={{
+              color: data.state === "active" ? "var(--color-accent)" : "var(--color-success)",
+            }}
+          >
+            {icon}
+          </span>
+        )}
+        <span className="truncate">{data.label}</span>
+      </div>
+      {data.description !== "" && (
+        <div className="text-[10px] truncate mt-0.5" style={{ color: "var(--color-text-muted)" }}>
+          {data.description}
+        </div>
+      )}
+      <Handle type="source" position={Position.Bottom} style={handleStyle} isConnectable={false} />
+    </div>
+  );
+}
@@ -0,0 +1,57 @@
+import { Handle, type NodeProps, Position } from "@xyflow/react";
+import type { TerminalNodeData } from "./types.ts";
+
+function borderColor(state: TerminalNodeData["state"]): string {
+  switch (state) {
+    case "completed":
+      return "var(--color-success)";
+    case "active":
+      return "var(--color-accent)";
+    default:
+      return "var(--color-border)";
+  }
+}
+
+function bgColor(state: TerminalNodeData["state"]): string {
+  if (state === "completed") return "var(--color-success)";
+  if (state === "active") return "var(--color-accent)";
+  return "var(--color-surface)";
+}
+
+export function TerminalNode(props: NodeProps) {
+  const data = props.data as TerminalNodeData;
+  const isStart = data.kind === "start";
+  const isActive = data.state === "active";
+  const handleStyle = {
+    background: "var(--color-text-muted)",
+    width: 6,
+    height: 6,
+    border: "none",
+  } as const;
+
+  return (
+    <div
+      className={`rounded-full border-2 flex items-center justify-center text-[10px] font-bold ${isActive ? "wf-node-pulse" : ""}`}
+      style={{
+        width: 40,
+        height: 40,
+        background: bgColor(data.state),
+        borderColor: borderColor(data.state),
+        color: data.state === "default" ? "var(--color-text-muted)" : "var(--color-bg)",
+      }}
+      title={isStart ? "Start" : "End"}
+    >
+      {isStart ? (
+        <Handle
+          type="source"
+          position={Position.Bottom}
+          style={handleStyle}
+          isConnectable={false}
+        />
+      ) : (
+        <Handle type="target" position={Position.Top} style={handleStyle} isConnectable={false} />
+      )}
+      {isStart ? "▶" : "■"}
+    </div>
+  );
+}
@@ -0,0 +1,29 @@
+import type { WorkflowGraphEdge } from "../../api.ts";
+
+export type NodeState = "default" | "completed" | "active";
+
+export type TerminalKind = "start" | "end";
+
+export type RoleNodeData = {
+  label: string;
+  description: string;
+  state: NodeState;
+  [key: string]: unknown;
+};
+
+export type TerminalNodeData = {
+  kind: TerminalKind;
+  state: NodeState;
+  [key: string]: unknown;
+};
+
+export type ConditionEdgeData = {
+  condition: string;
+  conditionDescription: string | null;
+  isFallback: boolean;
+  [key: string]: unknown;
+};
+
+export type GraphInput = {
+  edges: readonly WorkflowGraphEdge[];
+};
@@ -0,0 +1,127 @@
+import Dagre from "@dagrejs/dagre";
+import type { Edge, Node } from "@xyflow/react";
+import { useMemo } from "react";
+import type { WorkflowGraphEdge } from "../../api.ts";
+import type { ConditionEdgeData, NodeState, RoleNodeData, TerminalNodeData } from "./types.ts";
+
+const START_ID = "__start__";
+const END_ID = "__end__";
+const ROLE_NODE_WIDTH = 180;
+const ROLE_NODE_HEIGHT = 60;
+const TERMINAL_NODE_SIZE = 40;
+
+type LayoutInput = {
+  edges: readonly WorkflowGraphEdge[];
+  roles: Record<string, { description: string }>;
+  nodeStates: Map<string, NodeState>;
+};
+
+type LayoutResult = {
+  nodes: Node[];
+  edges: Edge[];
+};
+
+function collectNodeIds(edges: readonly WorkflowGraphEdge[]): Set<string> {
+  const ids = new Set<string>();
+  for (const e of edges) {
+    ids.add(e.from);
+    ids.add(e.to);
+  }
+  return ids;
+}
+
+function nodeSize(id: string): { width: number; height: number } {
+  if (id === START_ID || id === END_ID) {
+    return { width: TERMINAL_NODE_SIZE, height: TERMINAL_NODE_SIZE };
+  }
+  return { width: ROLE_NODE_WIDTH, height: ROLE_NODE_HEIGHT };
+}
+
+function buildRoleNode(
+  id: string,
+  pos: { x: number; y: number },
+  roles: Record<string, { description: string }>,
+  state: NodeState,
+): Node<RoleNodeData> {
+  const description = roles[id]?.description ?? "";
+  return {
+    id,
+    type: "role",
+    position: pos,
+    data: { label: id, description, state },
+    draggable: false,
+  };
+}
+
+function buildTerminalNode(
+  id: string,
+  pos: { x: number; y: number },
+  state: NodeState,
+): Node<TerminalNodeData> {
+  return {
+    id,
+    type: "terminal",
+    position: pos,
+    data: { kind: id === START_ID ? "start" : "end", state },
+    draggable: false,
+    selectable: false,
+  };
+}
+
+function edgeKey(e: WorkflowGraphEdge): string {
+  return `${e.from}->${e.to}::${e.condition}`;
+}
+
+function buildEdge(e: WorkflowGraphEdge): Edge<ConditionEdgeData> {
+  const isFallback = e.condition === "FALLBACK";
+  return {
+    id: edgeKey(e),
+    source: e.from,
+    target: e.to,
+    type: "condition",
+    data: {
+      condition: e.condition,
+      conditionDescription: e.conditionDescription,
+      isFallback,
+    },
+  };
+}
+
+export function useLayout(input: LayoutInput): LayoutResult {
+  return useMemo(() => {
+    const ids = collectNodeIds(input.edges);
+
+    const g = new Dagre.graphlib.Graph({ multigraph: true }).setDefaultEdgeLabel(() => ({}));
+    g.setGraph({ rankdir: "TB", nodesep: 60, ranksep: 80 });
+
+    for (const id of ids) {
+      const size = nodeSize(id);
+      g.setNode(id, { width: size.width, height: size.height });
+    }
+    for (const e of input.edges) {
+      if (e.from === e.to) {
+        continue;
+      }
+      g.setEdge(e.from, e.to, {}, edgeKey(e));
+    }
+
+    Dagre.layout(g);
+
+    const nodes: Node[] = [];
+    for (const id of ids) {
+      const dagNode = g.node(id);
+      const size = nodeSize(id);
+      const pos = { x: dagNode.x - size.width / 2, y: dagNode.y - size.height / 2 };
+      const state = input.nodeStates.get(id) ?? "default";
+      if (id === START_ID || id === END_ID) {
+        nodes.push(buildTerminalNode(id, pos, state));
+      } else {
+        nodes.push(buildRoleNode(id, pos, input.roles, state));
+      }
+    }
+
+    const edges: Edge[] = input.edges.map(buildEdge);
+
+    return { nodes, edges };
+  }, [input.edges, input.roles, input.nodeStates]);
+}
@@ -0,0 +1,61 @@
+import { Background, type EdgeTypes, MarkerType, type NodeTypes, ReactFlow } from "@xyflow/react";
+import "@xyflow/react/dist/style.css";
+import { useMemo } from "react";
+import type { WorkflowGraph as WorkflowGraphData } from "../../api.ts";
+import { ConditionEdge } from "./condition-edge.tsx";
+import { RoleNode } from "./role-node.tsx";
+import { TerminalNode } from "./terminal-node.tsx";
+import type { NodeState } from "./types.ts";
+import { useLayout } from "./use-layout.ts";
+
+type Props = {
+  graph: WorkflowGraphData;
+  roles: Record<string, { description: string }>;
+  nodeStates: Map<string, NodeState>;
+};
+
+const nodeTypes: NodeTypes = {
+  role: RoleNode,
+  terminal: TerminalNode,
+};
+
+const edgeTypes: EdgeTypes = {
+  condition: ConditionEdge,
+};
+
+export function WorkflowGraph({ graph, roles, nodeStates }: Props) {
+  const layout = useLayout({ edges: graph.edges, roles, nodeStates });
+
+  const styledEdges = useMemo(
+    () =>
+      layout.edges.map((e) => ({
+        ...e,
+        markerEnd: {
+          type: MarkerType.ArrowClosed,
+          width: 14,
+          height: 14,
+          color: "var(--color-text)",
+        },
+      })),
+    [layout.edges],
+  );
+
+  return (
+    <ReactFlow
+      nodes={layout.nodes}
+      edges={styledEdges}
+      nodeTypes={nodeTypes}
+      edgeTypes={edgeTypes}
+      fitView
+      fitViewOptions={{ padding: 0.15 }}
+      nodesDraggable={false}
+      nodesConnectable={false}
+      elementsSelectable={false}
+      proOptions={{ hideAttribution: true }}
+      colorMode="dark"
+      style={{ background: "var(--color-bg)" }}
+    >
+      <Background color="var(--color-border)" gap={20} size={1} />
+    </ReactFlow>
+  );
+}
@@ -19,3 +19,17 @@ body {
  color: var(--color-text);
  font-family: "Inter", system-ui, -apple-system, sans-serif;
 }
+
+@keyframes wf-node-pulse {
+  0%,
+  100% {
+    box-shadow: 0 0 0 0 rgba(124, 109, 240, 0.55);
+  }
+  50% {
+    box-shadow: 0 0 0 6px rgba(124, 109, 240, 0);
+  }
+}
+
+.wf-node-pulse {
+  animation: wf-node-pulse 1.6s ease-in-out infinite;
+}