diff --git a/src/renderer/src/components/dashboard-popout/AgentMap.test.tsx b/src/renderer/src/components/dashboard-popout/AgentMap.test.tsx
index 66b0d8ff32f..483e9d1e9ed 100644
--- a/src/renderer/src/components/dashboard-popout/AgentMap.test.tsx
+++ b/src/renderer/src/components/dashboard-popout/AgentMap.test.tsx
@@ -338,20 +338,30 @@ describe('AgentMap', () => {
       parentPaneKey: 'parent',
       conversationName: 'Worker'
     })
+    const nested = card({
+      paneKey: 'nested',
+      parentPaneKey: 'child',
+      conversationName: 'Subagent'
+    })
     const orphan = card({
       paneKey: 'orphan',
       parentPaneKey: 'filtered-parent',
       conversationName: 'Orphaned worker'
     })
-    const { container } = renderMap([parent, child, orphan])
-    const links = container.querySelectorAll('[data-agent-map-lineage-link]')
+    const { container } = renderMap([parent, child, nested, orphan])
+    const workerLink = container.querySelector('[data-child-pane-key="child"]')
+    const subagentLink = container.querySelector('[data-child-pane-key="nested"]')
 
     expect(screen.getByRole('button', { name: /Coordinator/ })).toBeInTheDocument()
     expect(screen.getByRole('button', { name: /^Worker/ })).toBeInTheDocument()
-    expect(links).toHaveLength(1)
-    expect(links[0]).toHaveClass('agent-map-lineage-link')
-    expect(links[0]).toHaveAttribute('data-parent-pane-key', 'parent')
-    expect(links[0]).toHaveAttribute('data-child-pane-key', 'child')
+    expect(container.querySelectorAll('[data-agent-map-lineage-link]')).toHaveLength(2)
+    expect(workerLink).toHaveClass('agent-map-lineage-link')
+    expect(workerLink).not.toHaveClass('is-subagent')
+    expect(workerLink).toHaveAttribute('data-agent-map-lineage-relation', 'orchestration')
+    expect(workerLink).toHaveAttribute('data-parent-pane-key', 'parent')
+    expect(subagentLink).toHaveClass('agent-map-lineage-link', 'is-subagent')
+    expect(subagentLink).toHaveAttribute('data-agent-map-lineage-relation', 'subagent')
+    expect(subagentLink).toHaveAttribute('data-parent-pane-key', 'child')
   })
 
   it('connects spawned workers across worktree rings', () => {
@@ -368,12 +378,42 @@ describe('AgentMap', () => {
       parentPaneKey: 'parent',
       conversationName: 'Worker'
     })
-    const { container } = renderMap([parent, child])
-    const link = container.querySelector('[data-agent-map-cross-worktree-lineage-link]')
+    const nested = card({
+      paneKey: 'nested',
+      worktreeId: 'nested-worktree',
+      worktreeName: 'Nested workspace',
+      parentPaneKey: 'child',
+      conversationName: 'Subagent'
+    })
+    const { container } = renderMap([parent, child, nested])
+    const workerLink = container.querySelector('[data-child-pane-key="child"]')
+    const subagentLink = container.querySelector('[data-child-pane-key="nested"]')
 
-    expect(link).toHaveClass('agent-map-lineage-link', 'is-cross-worktree')
-    expect(link).toHaveAttribute('data-parent-pane-key', 'parent')
-    expect(link).toHaveAttribute('data-child-pane-key', 'child')
+    expect(workerLink).toHaveClass('agent-map-lineage-link', 'is-cross-worktree')
+    expect(workerLink).not.toHaveClass('is-subagent')
+    expect(workerLink).toHaveAttribute('data-agent-map-lineage-relation', 'orchestration')
+    expect(subagentLink).toHaveClass('agent-map-lineage-link', 'is-cross-worktree', 'is-subagent')
+    expect(subagentLink).toHaveAttribute('data-agent-map-lineage-relation', 'subagent')
+  })
+
+  it('keeps lineage styling to one lightweight path per relationship at fleet scale', () => {
+    const cards = Array.from({ length: 240 }, (_, index) =>
+      card({
+        paneKey: `agent-${index}`,
+        parentPaneKey: index === 0 ? undefined : `agent-${index - 1}`,
+        conversationName: `Agent ${index}`
+      })
+    )
+    const { container } = renderMap(cards, { selectedPaneKey: 'agent-0' })
+
+    expect(container.querySelectorAll('[data-agent-map-lineage-link]')).toHaveLength(239)
+    expect(
+      container.querySelectorAll('[data-agent-map-lineage-relation="orchestration"]')
+    ).toHaveLength(1)
+    expect(container.querySelectorAll('[data-agent-map-lineage-relation="subagent"]')).toHaveLength(
+      238
+    )
+    expect(container.querySelectorAll('filter, animate, animateTransform')).toHaveLength(0)
   })
 
   it('connects visible child worktrees beneath their parent ring', () => {
diff --git a/src/renderer/src/components/dashboard-popout/AgentMapScene.tsx b/src/renderer/src/components/dashboard-popout/AgentMapScene.tsx
index edfa866b966..2719f4f7921 100644
--- a/src/renderer/src/components/dashboard-popout/AgentMapScene.tsx
+++ b/src/renderer/src/components/dashboard-popout/AgentMapScene.tsx
@@ -159,17 +159,21 @@ export const AgentMapScene = memo(function AgentMapScene({
               })}
             </g>
             <g className="agent-map-lineage-links" aria-hidden>
-              {crossWorktreeLineage.map(({ parent, child }) => (
-                <path
-                  key={child.card.paneKey}
-                  className="agent-map-lineage-link is-cross-worktree"
-                  data-agent-map-lineage-link=""
-                  data-agent-map-cross-worktree-lineage-link=""
-                  data-parent-pane-key={parent.card.paneKey}
-                  data-child-pane-key={child.card.paneKey}
-                  d={agentLineagePath(parent, child)}
-                />
-              ))}
+              {crossWorktreeLineage.map(({ parent, child }) => {
+                const relation = parent.card.parentPaneKey ? 'subagent' : 'orchestration'
+                return (
+                  <path
+                    key={child.card.paneKey}
+                    className={`agent-map-lineage-link is-cross-worktree${relation === 'subagent' ? ' is-subagent' : ''}`}
+                    data-agent-map-lineage-link=""
+                    data-agent-map-cross-worktree-lineage-link=""
+                    data-agent-map-lineage-relation={relation}
+                    data-parent-pane-key={parent.card.paneKey}
+                    data-child-pane-key={child.card.paneKey}
+                    d={agentLineagePath(parent, child)}
+                  />
+                )
+              })}
             </g>
             {project.worktrees.map((worktree) => (
               <AgentMapWorktreeRingNode
diff --git a/src/renderer/src/components/dashboard-popout/AgentMapWorktreeRingNode.tsx b/src/renderer/src/components/dashboard-popout/AgentMapWorktreeRingNode.tsx
index 859414990ed..9102b5e51c0 100644
--- a/src/renderer/src/components/dashboard-popout/AgentMapWorktreeRingNode.tsx
+++ b/src/renderer/src/components/dashboard-popout/AgentMapWorktreeRingNode.tsx
@@ -272,11 +272,16 @@ export const AgentMapWorktreeRingNode = memo(function AgentMapWorktreeRingNode({
                 const parent = child.card.parentPaneKey
                   ? agentsByPaneKey.get(child.card.parentPaneKey)
                   : undefined
-                return !parent || child.y <= parent.y ? null : (
+                if (!parent || child.y <= parent.y) {
+                  return null
+                }
+                const relation = parent.card.parentPaneKey ? 'subagent' : 'orchestration'
+                return (
                   <path
                     key={child.card.paneKey}
-                    className="agent-map-lineage-link"
+                    className={`agent-map-lineage-link${relation === 'subagent' ? ' is-subagent' : ''}`}
                     data-agent-map-lineage-link=""
+                    data-agent-map-lineage-relation={relation}
                     data-parent-pane-key={parent.card.paneKey}
                     data-child-pane-key={child.card.paneKey}
                     d={lineagePath(parent, child)}
diff --git a/src/renderer/src/components/dashboard-popout/agent-map.css b/src/renderer/src/components/dashboard-popout/agent-map.css
index 12e2ad578a2..1170931f1b8 100644
--- a/src/renderer/src/components/dashboard-popout/agent-map.css
+++ b/src/renderer/src/components/dashboard-popout/agent-map.css
@@ -205,6 +205,10 @@
   vector-effect: non-scaling-stroke;
 }
 
+.agent-map-lineage-link.is-subagent {
+  stroke-dasharray: none;
+}
+
 .agent-map-agent-hit {
   fill: transparent;
   stroke: transparent;