feat(FN-3530): add modal-based agent error details and UI/docs updates

- Add AgentErrorDetailsModal and wire agent list/detail views to open full error diagnostics while keeping inline errors compact
- Add line-number gutter toggle in FileEditor and Files modal with dashboard persistence coverage
- Align project memory scope guidance across core logic, CLI tool docs, and dashboard docs
- Add regression coverage for runtime plugin alias behavior and update related engine/heartbeat tests
- Include changesets for FN-3530 UI improvements and FN-3485 memory guidance updates

Fusion-Task-Id: FN-3530

.changeset/fn-3530-agent-error-modal.md

@@ -0,0 +1,5 @@
+---
+"@runfusion/fusion": patch
+---
+
+Improve dashboard agent error UX by replacing inline stack-trace dumps with compact error indicators that open a shared details modal, including copy-to-clipboard and a prefilled GitHub issue shortcut.

packages/dashboard/README.md

@@ -264,6 +264,7 @@ Manage AI agents with a dedicated control surface accessible from the main dashb
 - **View Modes**: Board (compact grid) and list (detailed card) layouts, persisted to localStorage
 - **Agent CRUD**: Create agents with name and role (create form's text input and role/type select both use tokenized styling — `var(--surface)`, `var(--text)`, `var(--border)`, `var(--radius-sm)`, `var(--focus-ring)` — for consistent theme-aware rendering across all color themes and light/dark modes), change state, update roles inline, delete idle and terminated agents (active and paused agents must be stopped/terminated first)
 - **Health Monitoring**: Heartbeat-based health status (Healthy, Unresponsive, Starting, Paused, Terminated) using CSS variable references for theme consistency
+- **Agent Error Details**: Agent collection views now show a compact inline error indicator (instead of raw stack traces) that opens a shared error-details modal with full text, copy action, and a prefilled "Report on GitHub" shortcut
 - **Agent Detail**: Click any agent card to open a detail modal with full agent information. In list view, each agent card also provides an explicit **View Details** action button in the card actions row for clearer discoverability, while the existing clickable identity/header area remains supported. The modal features a compact header with clear visual hierarchy:
   - **Identity area** (left): Agent icon, name, and state/health badges
   - **Lifecycle controls** (center): Compact action buttons for state transitions (Start, Pause, Resume, Retry, Stop, Delete)

packages/dashboard/app/components/AgentDetailView.tsx

@@ -27,6 +27,7 @@ import { useConfirm } from "../hooks/useConfirm";
 import { useModalResizePersist } from "../hooks/useModalResizePersist";
 import { AgentImportModal } from "./AgentImportModal";
 import { AgentAvatar } from "./AgentAvatar";
+import { AgentErrorIndicator } from "./AgentErrorDetailsModal";
 
 /**
  * Simple className utility - joins class names conditionally
@@ -1511,7 +1512,19 @@ function RunsTab({
                 {detailRun.stderrExcerpt && (
                   <div className="run-output-section">
                     <div className="run-output-label run-output-label--error">Errors</div>
-                    <pre className="run-output-panel run-output-panel--error">{detailRun.stderrExcerpt}</pre>
+                    <AgentErrorIndicator
+                      errorText={detailRun.stderrExcerpt}
+                      summaryPrefix="Run error"
+                      issueContext={{
+                        surface: "AgentDetailView runs",
+                        agentId,
+                        agentName,
+                        agentState,
+                        runId: detailRun.id,
+                        taskId: undefined,
+                        timestamp: detailRun.startedAt,
+                      }}
+                    />
                   </div>
                 )}
 

packages/dashboard/app/components/AgentErrorDetailsModal.css

@@ -0,0 +1,51 @@
+.agent-error-indicator {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--space-xs);
+  width: 100%;
+  border: var(--btn-border-width) solid color-mix(in srgb, var(--color-error) 30%, var(--border));
+  background: color-mix(in srgb, var(--color-error) 10%, transparent);
+  color: var(--color-error);
+  border-radius: var(--radius-sm);
+  padding: var(--space-xs) var(--space-sm);
+  cursor: pointer;
+  text-align: left;
+}
+
+.agent-error-indicator__label {
+  min-width: 0;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  font-family: var(--font-mono);
+  font-size: var(--space-md);
+}
+
+.agent-error-modal {
+  max-width: min(calc(var(--space-2xl) * 20), 100%);
+}
+
+.agent-error-modal__content {
+  padding: 0 var(--space-lg) var(--space-md);
+}
+
+.agent-error-modal__error {
+  margin: 0;
+  padding: var(--space-sm);
+  border-radius: var(--radius-sm);
+  border: var(--btn-border-width) solid var(--border);
+  background: var(--bg);
+  color: var(--text);
+  font-family: var(--font-mono);
+  font-size: var(--space-md);
+  max-height: calc(var(--space-2xl) * 8);
+  overflow: auto;
+  white-space: pre-wrap;
+  word-break: break-word;
+}
+
+@media (max-width: 768px) {
+  .agent-error-modal {
+    width: calc(100% - var(--space-lg));
+  }
+}

packages/dashboard/app/components/AgentErrorDetailsModal.tsx

@@ -0,0 +1,124 @@
+import "./AgentErrorDetailsModal.css";
+import { useMemo, useState } from "react";
+import { AlertCircle, Check, Copy, ExternalLink } from "lucide-react";
+
+const DEFAULT_ISSUE_URL = "https://github.com/Runfusion/Fusion/issues/new";
+
+export interface AgentErrorIssueContext {
+  surface: string;
+  agentId?: string;
+  agentName?: string;
+  agentState?: string;
+  runId?: string;
+  taskId?: string;
+  timestamp?: string;
+}
+
+interface AgentErrorDetailsModalProps {
+  open: boolean;
+  onClose: () => void;
+  errorText: string;
+  issueContext: AgentErrorIssueContext;
+}
+
+export function buildAgentErrorIssueUrl(errorText: string, context: AgentErrorIssueContext): string {
+  const title = `[Agent Error] ${context.surface}${context.agentName ? ` - ${context.agentName}` : ""}`;
+  const bodyLines = [
+    "## Agent Error Report",
+    "",
+    `- Surface: ${context.surface}`,
+    `- Agent ID: ${context.agentId ?? "unknown"}`,
+    `- Agent Name: ${context.agentName ?? "unknown"}`,
+    `- Agent State: ${context.agentState ?? "unknown"}`,
+    `- Run ID: ${context.runId ?? "n/a"}`,
+    `- Task ID: ${context.taskId ?? "n/a"}`,
+    `- Timestamp: ${context.timestamp ?? new Date().toISOString()}`,
+    "",
+    "## Error",
+    "```text",
+    errorText,
+    "```",
+  ];
+
+  const params = new URLSearchParams({
+    title,
+    body: bodyLines.join("\n"),
+  });
+
+  return `${DEFAULT_ISSUE_URL}?${params.toString()}`;
+}
+
+export function AgentErrorDetailsModal({ open, onClose, errorText, issueContext }: AgentErrorDetailsModalProps) {
+  const [copied, setCopied] = useState(false);
+  const issueUrl = useMemo(() => buildAgentErrorIssueUrl(errorText, issueContext), [errorText, issueContext]);
+
+  if (!open) {
+    return null;
+  }
+
+  return (
+    <div className="modal-overlay open" onClick={(event) => event.target === event.currentTarget && onClose()} role="dialog" aria-modal="true" aria-label="Agent error details">
+      <div className="modal agent-error-modal">
+        <div className="modal-header">
+          <h2 className="modal-title">
+            <AlertCircle size={16} />
+            Agent Error Details
+          </h2>
+          <button className="modal-close" onClick={onClose} aria-label="Close">&times;</button>
+        </div>
+        <div className="agent-error-modal__content">
+          <pre className="agent-error-modal__error">{errorText}</pre>
+        </div>
+        <div className="modal-actions">
+          <button
+            type="button"
+            className="btn btn-sm"
+            onClick={() => {
+              void navigator.clipboard.writeText(errorText).then(() => {
+                setCopied(true);
+                setTimeout(() => setCopied(false), 1500);
+              });
+            }}
+            aria-label={copied ? "Copied error to clipboard" : "Copy error to clipboard"}
+          >
+            {copied ? <Check size={14} /> : <Copy size={14} />}
+            {copied ? "Copied" : "Copy"}
+          </button>
+          <a
+            className="btn btn-sm btn-warning"
+            href={issueUrl}
+            target="_blank"
+            rel="noreferrer"
+            onClick={(event) => {
+              event.preventDefault();
+              window.open(issueUrl, "_blank", "noopener,noreferrer");
+            }}
+          >
+            <ExternalLink size={14} />
+            Report on GitHub
+          </a>
+        </div>
+      </div>
+    </div>
+  );
+}
+
+interface AgentErrorIndicatorProps {
+  errorText: string;
+  issueContext: AgentErrorIssueContext;
+  summaryPrefix?: string;
+}
+
+export function AgentErrorIndicator({ errorText, issueContext, summaryPrefix = "Error" }: AgentErrorIndicatorProps) {
+  const [open, setOpen] = useState(false);
+
+  return (
+    <>
+      <button type="button" className="agent-error-indicator" onClick={() => setOpen(true)} aria-label="Open error details">
+        <AlertCircle size={14} />
+        <span className="agent-error-indicator__label">{summaryPrefix}</span>
+      </button>
+      <AgentErrorDetailsModal open={open} onClose={() => setOpen(false)} errorText={errorText} issueContext={issueContext} />
+    </>
+  );
+}

packages/dashboard/app/components/AgentListModal.tsx

@@ -12,8 +12,8 @@ import { getAgentHealthStatus } from "../utils/agentHealth";
 import { getErrorMessage } from "@fusion/core";
 import type { AgentHealthStatus } from "../utils/agentHealth";
 import { useConfirm } from "../hooks/useConfirm";
-import { CollapsibleErrorDisplay } from "./AgentsView";
 import { AgentAvatar } from "./AgentAvatar";
+import { AgentErrorIndicator } from "./AgentErrorDetailsModal";
 
 interface AgentListModalProps {
   isOpen: boolean;
@@ -223,6 +223,17 @@ export function AgentListModal({ isOpen, onClose, addToast, projectId }: AgentLi
     return "muted";
   };
 
+  const getHealthSummary = (agent: Agent, health: AgentHealthStatus): { title: string | undefined; label: string | null } => {
+    if (agent.state === "error") {
+      return { title: undefined, label: "Error" };
+    }
+
+    return {
+      title: health.reason ?? health.label,
+      label: health.stateDerived ? null : health.label,
+    };
+  };
+
   if (!isOpen) return null;
 
   return (
@@ -339,6 +350,7 @@ export function AgentListModal({ isOpen, onClose, addToast, projectId }: AgentLi
               // Board view: compact grid layout
               displayAgents.map(agent => {
                 const health = getHealthStatus(agent);
+                const healthSummary = getHealthSummary(agent, health);
                 const healthTone = getHealthTone(health);
                 return (
                   <div key={agent.id} className="agent-board-card" data-state={agent.state}>
@@ -350,7 +362,7 @@ export function AgentListModal({ isOpen, onClose, addToast, projectId }: AgentLi
                       >
                         {agent.state}
                       </span>
-                      <span className="agent-board-health" data-health={healthTone} title={health.reason ?? health.label}>
+                      <span className="agent-board-health" data-health={healthTone} title={healthSummary.title}>
                         {health.icon}
                       </span>
                     </div>
@@ -482,6 +494,7 @@ export function AgentListModal({ isOpen, onClose, addToast, projectId }: AgentLi
               // List view: detailed card layout
               displayAgents.map(agent => {
                 const health = getHealthStatus(agent);
+                const healthSummary = getHealthSummary(agent, health);
                 const healthTone = getHealthTone(health);
                 return (
                   <div key={agent.id} className="agent-card" data-state={agent.state}>
@@ -531,8 +544,8 @@ export function AgentListModal({ isOpen, onClose, addToast, projectId }: AgentLi
                         >
                           {agent.state}
                         </span>
-                        <span className="badge agent-list-health-badge" data-health={healthTone} title={health.reason ?? health.label}>
+                        <span className="badge agent-list-health-badge" data-health={healthTone} title={healthSummary.title}>
-                          {health.icon}{!health.stateDerived && ` ${health.label}`}
+                          {health.icon}{healthSummary.label ? ` ${healthSummary.label}` : ""}
                         </span>
                         <span className="badge text-secondary">
                           {getRoleLabel(agent.role)}
@@ -542,7 +555,16 @@ export function AgentListModal({ isOpen, onClose, addToast, projectId }: AgentLi
 
                     <div className="agent-card-body">
                       {agent.state === "error" && agent.lastError ? (
-                        <CollapsibleErrorDisplay errorText={agent.lastError} />
+                        <AgentErrorIndicator
+                          errorText={agent.lastError}
+                          issueContext={{
+                            surface: "AgentListModal list",
+                            agentId: agent.id,
+                            agentName: agent.name,
+                            agentState: agent.state,
+                            taskId: agent.taskId,
+                          }}
+                        />
                       ) : null}
                       {agent.taskId && (
                         <div className="agent-task">

packages/dashboard/app/components/AgentsView.tsx

@@ -1,6 +1,6 @@
 import "./AgentsView.css";
 import { useState, useEffect, useCallback, useRef, useMemo, useId, lazy, Suspense, type CSSProperties } from "react";
-import { Plus, Play, Pause, Activity, Trash2, RefreshCw, Bot, List, ChevronRight, ChevronDown, ChevronUp, Filter, Upload, Network, SlidersHorizontal, Copy, Check, ZoomIn, ZoomOut, Minimize2 } from "lucide-react";
+import { Plus, Play, Pause, Activity, Trash2, RefreshCw, Bot, List, ChevronRight, Filter, Upload, Network, SlidersHorizontal, ZoomIn, ZoomOut, Minimize2 } from "lucide-react";
 import type { Agent, AgentCapability, AgentOnboardingSummary, AgentState, OrgTreeNode } from "../api";
 import { updateAgent, updateAgentState, deleteAgent, startAgentRun, fetchOrgTree, fetchSettings, updateSettings } from "../api";
 
@@ -28,6 +28,7 @@ import { isEphemeralAgent, getErrorMessage } from "@fusion/core";
 import { formatAgentSkillBadgeLabel } from "../utils/agentSkills";
 import { resolveOrgChartLayoutMode, type OrgChartLayoutMode } from "./agentsOrgChartLayout";
 import { AgentAvatar } from "./AgentAvatar";
+import { AgentErrorIndicator } from "./AgentErrorDetailsModal";
 
 export interface AgentsViewProps {
   addToast: (message: string, type?: "success" | "error") => void;
@@ -89,58 +90,6 @@ function getStateCardClass(
   }
 }
 
-export function CollapsibleErrorDisplay({
-  errorText,
-  className,
-}: {
-  errorText: string;
-  className?: string;
-}) {
-  const [expanded, setExpanded] = useState(false);
-  const [copied, setCopied] = useState(false);
-
-  const handleCopy = useCallback(async () => {
-    try {
-      await navigator.clipboard.writeText(errorText);
-      setCopied(true);
-      setTimeout(() => setCopied(false), 2000);
-    } catch {
-      // Ignore clipboard errors
-    }
-  }, [errorText]);
-
-  return (
-    <div className={`agent-card-error${className ? ` ${className}` : ""}`}>
-      <div className="agent-card-error-header">
-        <span className="agent-card-error-preview" title={errorText}>
-          {errorText}
-        </span>
-        <div className="agent-card-error-actions">
-          <button
-            type="button"
-            className="btn-icon touch-target agent-card-error-copy-btn"
-            onClick={() => void handleCopy()}
-            title={copied ? "Copied" : "Copy error"}
-            aria-label={copied ? "Copied error to clipboard" : "Copy error to clipboard"}
-          >
-            {copied ? <Check size={14} /> : <Copy size={14} />}
-          </button>
-          <button
-            type="button"
-            className="btn-icon touch-target agent-card-error-toggle"
-            onClick={() => setExpanded((value) => !value)}
-            title={expanded ? "Collapse error" : "Expand error"}
-            aria-label={expanded ? "Collapse error" : "Expand error"}
-            aria-expanded={expanded}
-          >
-            {expanded ? <ChevronUp size={14} /> : <ChevronDown size={14} />}
-          </button>
-        </div>
-      </div>
-      {expanded ? <pre className="agent-card-error-full">{errorText}</pre> : null}
-    </div>
-  );
-}
 
 function getOrgChartLeafCount(node: OrgTreeNode): number {
   if (node.children.length === 0) {
@@ -150,6 +99,17 @@ function getOrgChartLeafCount(node: OrgTreeNode): number {
   return node.children.reduce((sum, child) => sum + getOrgChartLeafCount(child), 0);
 }
 
+function getHealthSummary(agent: Agent, health: AgentHealthStatus): { title: string | undefined; label: string | null } {
+  if (agent.state === "error") {
+    return { title: undefined, label: "Error" };
+  }
+
+  return {
+    title: health.reason ?? health.label,
+    label: health.stateDerived ? null : health.label,
+  };
+}
+
 function OrgChartNode({
   node,
   onSelect,
@@ -165,6 +125,7 @@ function OrgChartNode({
 }) {
   const { agent, children } = node;
   const health = getHealthStatus(agent);
+  const healthSummary = getHealthSummary(agent, health);
   const stateBadgeClass = getStateBadgeClass(agent.state);
   const stateNodeClass = getStateCardClass("org-chart-node-card", agent.state);
   const subtreeLeafCount = getOrgChartLeafCount(node);
@@ -199,9 +160,9 @@ function OrgChartNode({
           >
             {agent.state}
           </span>
-          <span className="org-chart-node__health" style={{ color: health.color }} title={health.reason ?? health.label}>
+          <span className="org-chart-node__health" style={{ color: health.color }} title={healthSummary.title}>
             {health.icon}
-            {!health.stateDerived && <span className="text-secondary">{health.label}</span>}
+            {healthSummary.label && <span className="text-secondary">{healthSummary.label}</span>}
           </span>
         </div>
       </div>
@@ -1109,6 +1070,7 @@ export function AgentsView({ addToast, projectId, onOpenTaskLogs, agentOnboardin
             ) : (
               displayAgents.map((agent) => {
                 const health = getHealthStatus(agent);
+                const healthSummary = getHealthSummary(agent, health);
                 const stateBadgeClass = getStateBadgeClass(agent.state);
                 const stateCardClass = getStateCardClass("agent-board-card", agent.state);
                 return (
@@ -1134,8 +1096,8 @@ export function AgentsView({ addToast, projectId, onOpenTaskLogs, agentOnboardin
                       </div>
                       <div className="agent-board-name">{agent.name}</div>
                       <div className="agent-board-id">{agent.id}</div>
-                      <div className="agent-board-health" style={{ color: health.color }} title={health.reason ?? health.label}>
+                      <div className="agent-board-health" style={{ color: health.color }} title={healthSummary.title}>
-                        {health.icon}{!health.stateDerived && ` ${health.label}`}
+                        {health.icon}{healthSummary.label ? ` ${healthSummary.label}` : ""}
                       </div>
                     </div>
                   </div>
@@ -1151,6 +1113,7 @@ export function AgentsView({ addToast, projectId, onOpenTaskLogs, agentOnboardin
             // List view: detailed card layout
             displayAgents.map(agent => {
               const health = getHealthStatus(agent);
+              const healthSummary = getHealthSummary(agent, health);
               const stateBadgeClass = getStateBadgeClass(agent.state);
               const stateCardClass = getStateCardClass("agent-card", agent.state);
               const configuredIntervalMs = resolveHeartbeatIntervalMs(agent.runtimeConfig?.heartbeatIntervalMs);
@@ -1221,8 +1184,8 @@ export function AgentsView({ addToast, projectId, onOpenTaskLogs, agentOnboardin
                       >
                         {agent.state}
                       </span>
-                      <span className="badge" style={{ color: health.color }} title={health.reason ?? health.label}>
+                      <span className="badge" style={{ color: health.color }} title={healthSummary.title}>
-                        {health.icon}{!health.stateDerived && ` ${health.label}`}
+                        {health.icon}{healthSummary.label ? ` ${healthSummary.label}` : ""}
                       </span>
                       <span className="badge text-secondary">
                         {getRoleLabel(agent.role)}
@@ -1247,7 +1210,16 @@ export function AgentsView({ addToast, projectId, onOpenTaskLogs, agentOnboardin
 
                   <div className="agent-card-body">
                     {agent.state === "error" && agent.lastError ? (
-                      <CollapsibleErrorDisplay errorText={agent.lastError} />
+                      <AgentErrorIndicator
+                        errorText={agent.lastError}
+                        issueContext={{
+                          surface: "AgentsView list",
+                          agentId: agent.id,
+                          agentName: agent.name,
+                          agentState: agent.state,
+                          taskId: agent.taskId,
+                        }}
+                      />
                     ) : null}
                     {agent.taskId && (
                       <div className="agent-task">

packages/dashboard/app/components/__tests__/AgentDetailView.test.tsx

@@ -1297,6 +1297,58 @@ describe("AgentDetailView", () => {
     });
   });
 
+  it("shows run error in modal and launches prefilled GitHub issue", async () => {
+    const runId = "run-error";
+    mockFetchAgentRuns.mockResolvedValueOnce([
+      {
+        id: runId,
+        agentId: "agent-001",
+        startedAt: "2024-01-01T00:00:00.000Z",
+        endedAt: "2024-01-01T00:01:00.000Z",
+        status: "failed",
+      } as AgentHeartbeatRun,
+    ]);
+    mockFetchAgentRunLogs.mockResolvedValueOnce([]);
+    mockFetchAgentRunDetail.mockResolvedValueOnce({
+      id: runId,
+      agentId: "agent-001",
+      startedAt: "2024-01-01T00:00:00.000Z",
+      endedAt: "2024-01-01T00:01:00.000Z",
+      status: "failed",
+      stderrExcerpt: "fatal: exploded",
+    } as AgentHeartbeatRun);
+
+    render(
+      <AgentDetailView
+        agentId="agent-001"
+        onClose={vi.fn()}
+        addToast={vi.fn()}
+        initialTab="runs"
+        initialRunId={runId}
+      />,
+    );
+
+    await waitFor(() => {
+      expect(screen.getByRole("button", { name: "Open error details" })).toBeInTheDocument();
+    });
+
+    expect(screen.queryByText("fatal: exploded")).toBeNull();
+    expect(screen.queryByLabelText("Agent error details")).toBeNull();
+    fireEvent.click(screen.getByRole("button", { name: "Open error details" }));
+    expect(screen.getByLabelText("Agent error details")).toBeInTheDocument();
+    expect(screen.getByText("fatal: exploded")).toBeInTheDocument();
+
+    const openSpy = vi.spyOn(window, "open").mockImplementation(() => null);
+    fireEvent.click(screen.getByRole("link", { name: "Report on GitHub" }));
+    expect(openSpy).toHaveBeenCalledWith(
+      expect.stringContaining("https://github.com/Runfusion/Fusion/issues/new?"),
+      "_blank",
+      "noopener,noreferrer",
+    );
+    expect(openSpy.mock.calls[0]?.[0]).toContain("run-error");
+    openSpy.mockRestore();
+  });
+
   it("auto-expands the active run when opened from running control context", async () => {
     const activeRunId = "run-001";
     mockFetchAgentRunLogs.mockResolvedValueOnce([
@@ -1333,8 +1385,9 @@ describe("AgentDetailView", () => {
     });
 
     await waitFor(() => {
-      expect(screen.getByText("Active run log line")).toBeInTheDocument();
       expect(screen.getByText("System Prompt")).toBeInTheDocument();
+      const viewer = screen.getByTestId("agent-log-viewer");
+      expect(viewer.textContent).toContain("Active run log line");
     });
   });
 
@@ -1382,8 +1435,9 @@ describe("AgentDetailView", () => {
 
       expect(screen.getByText("Latest run · run-1001")).toBeInTheDocument();
       await waitFor(() => {
-        expect(screen.getByText("First entry")).toBeInTheDocument();
+        const viewer = screen.getByTestId("agent-log-viewer");
-        expect(screen.getByText("Second entry")).toBeInTheDocument();
+        expect(viewer.textContent).toContain("First entry");
+        expect(viewer.textContent).toContain("Second entry");
       });
     });
 

packages/dashboard/app/components/__tests__/AgentListModal.test.tsx

@@ -318,7 +318,7 @@ describe("AgentListModal", () => {
       });
     });
 
-    it("renders collapsible error display for error agents in list view", async () => {
+    it("renders compact error indicator and opens modal with actions for error agents", async () => {
       mockFetchAgents.mockResolvedValueOnce([
         {
           ...mockAgents[0],
@@ -338,17 +338,26 @@ describe("AgentListModal", () => {
       );
 
       await waitFor(() => {
-        expect(screen.getAllByText("modal failure").length).toBeGreaterThan(0);
+        expect(screen.getByRole("button", { name: "Open error details" })).toBeTruthy();
       });
 
-      fireEvent.click(screen.getByRole("button", { name: "Expand error" }));
+      expect(screen.queryByText("modal failure")).toBeNull();
-      expect(screen.getByRole("button", { name: "Collapse error" })).toBeTruthy();
+      fireEvent.click(screen.getByRole("button", { name: "Open error details" }));
+      expect(screen.getByLabelText("Agent error details")).toBeTruthy();
 
       fireEvent.click(screen.getByRole("button", { name: "Copy error to clipboard" }));
       await waitFor(() => {
         expect(mockClipboardWriteText).toHaveBeenCalledWith("modal failure");
       });
-      expect(screen.getByRole("button", { name: "Copied error to clipboard" })).toBeTruthy();
+
+      const openSpy = vi.spyOn(window, "open").mockImplementation(() => null);
+      fireEvent.click(screen.getByRole("link", { name: "Report on GitHub" }));
+      expect(openSpy).toHaveBeenCalledWith(
+        expect.stringContaining("https://github.com/Runfusion/Fusion/issues/new?"),
+        "_blank",
+        "noopener,noreferrer",
+      );
+      openSpy.mockRestore();
     });
 
     it("renders health badges via data attributes instead of inline color styles", async () => {

packages/dashboard/app/components/__tests__/AgentsView.test.tsx

@@ -1010,7 +1010,7 @@ describe("AgentsView", () => {
       );
     });
 
-    it("renders collapsible error display and supports expand/copy", async () => {
+    it("renders compact error indicator and opens modal with copy/github actions", async () => {
       const errorAgent: Agent = {
         ...mockAgents[0],
         id: "agent-error",
@@ -1024,20 +1024,30 @@ describe("AgentsView", () => {
       render(<AgentsView addToast={mockAddToast} />);
 
       await waitFor(() => {
-        expect(screen.getAllByText("something broke").length).toBeGreaterThan(0);
+        expect(screen.getByRole("button", { name: "Open error details" })).toBeTruthy();
       });
 
-      const expandButton = screen.getByRole("button", { name: "Expand error" });
+      expect(screen.queryByText("something broke")).toBeNull();
-      fireEvent.click(expandButton);
+      expect(screen.queryByLabelText("Agent error details")).toBeNull();
-      expect(screen.getByRole("button", { name: "Collapse error" })).toBeTruthy();
+      fireEvent.click(screen.getByRole("button", { name: "Open error details" }));
-      fireEvent.click(screen.getByRole("button", { name: "Collapse error" }));
+
-      expect(screen.getByRole("button", { name: "Expand error" })).toBeTruthy();
+      expect(screen.getByLabelText("Agent error details")).toBeTruthy();
+      expect(screen.getAllByText("something broke").length).toBeGreaterThan(0);
 
       fireEvent.click(screen.getByRole("button", { name: "Copy error to clipboard" }));
       await waitFor(() => {
         expect(mockClipboardWriteText).toHaveBeenCalledWith("something broke");
       });
-      expect(screen.getByRole("button", { name: "Copied error to clipboard" })).toBeTruthy();
+
+      const openSpy = vi.spyOn(window, "open").mockImplementation(() => null);
+      fireEvent.click(screen.getByRole("link", { name: "Report on GitHub" }));
+      expect(openSpy).toHaveBeenCalledWith(
+        expect.stringContaining("https://github.com/Runfusion/Fusion/issues/new?"),
+        "_blank",
+        "noopener,noreferrer",
+      );
+      expect(openSpy.mock.calls[0]?.[0]).toContain("Surface%3A+AgentsView+list");
+      openSpy.mockRestore();
     });
 
     it("does not render error display without error state and lastError", async () => {
@@ -1055,7 +1065,7 @@ describe("AgentsView", () => {
       });
 
       expect(screen.queryByText("should not show")).toBeNull();
-      expect(screen.queryByRole("button", { name: "Copy error to clipboard" })).toBeNull();
+      expect(screen.queryByRole("button", { name: "Open error details" })).toBeNull();
     });
 
     it("shows refresh button", async () => {