diff --git a/.changeset/fix-usage-indicator-icons.md b/.changeset/fix-usage-indicator-icons.md
new file mode 100644
index 00000000..f4d2142b
--- /dev/null
+++ b/.changeset/fix-usage-indicator-icons.md
@@ -0,0 +1,5 @@
+---
+"@perstack/tui-components": patch
+---
+
+fix: correct context window usage pie chart icon thresholds to match visual representation
diff --git a/packages/tui-components/src/constants.ts b/packages/tui-components/src/constants.ts
index d8cb87c6..bd4ca523 100644
--- a/packages/tui-components/src/constants.ts
+++ b/packages/tui-components/src/constants.ts
@@ -46,7 +46,7 @@ export const KEY_BINDINGS = {
 
 export const SPINNER_FRAMES = ["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"] as const
 
-export const USAGE_INDICATORS = { LOW: "◔", MEDIUM: "◑", HIGH: "◕", FULL: "●" } as const
+export const USAGE_INDICATORS = { EMPTY: "○", LOW: "◔", MEDIUM: "◑", HIGH: "◕", FULL: "●" } as const
 
 export const KEY_HINTS = {
   NAVIGATE: `${KEY_BINDINGS.NAVIGATE_UP}${KEY_BINDINGS.NAVIGATE_DOWN}:Navigate`,
diff --git a/packages/tui-components/src/execution/components/delegation-tree.tsx b/packages/tui-components/src/execution/components/delegation-tree.tsx
index c919ddcf..b281f151 100644
--- a/packages/tui-components/src/execution/components/delegation-tree.tsx
+++ b/packages/tui-components/src/execution/components/delegation-tree.tsx
@@ -7,10 +7,11 @@ import { flattenTree } from "../hooks/use-delegation-tree.js"
 import { useSpinner } from "../hooks/use-spinner.js"
 
 function getUsageIcon(percent: number): string {
-  if (percent <= 25) return USAGE_INDICATORS.LOW
-  if (percent <= 50) return USAGE_INDICATORS.MEDIUM
-  if (percent <= 75) return USAGE_INDICATORS.HIGH
-  return USAGE_INDICATORS.FULL
+  if (percent >= 75) return USAGE_INDICATORS.FULL
+  if (percent >= 50) return USAGE_INDICATORS.HIGH
+  if (percent >= 25) return USAGE_INDICATORS.MEDIUM
+  if (percent >= 5) return USAGE_INDICATORS.LOW
+  return USAGE_INDICATORS.EMPTY
 }
 
 function buildPrefix(flatNode: FlatTreeNode): string {