diff --git a/packages/opencode/src/altimate/telemetry/error-detail.ts b/packages/opencode/src/altimate/telemetry/error-detail.ts
index a424f6c52a..bc86028eb1 100644
--- a/packages/opencode/src/altimate/telemetry/error-detail.ts
+++ b/packages/opencode/src/altimate/telemetry/error-detail.ts
@@ -400,6 +400,18 @@ export function describeToolError(raw: string) {
   }
 }
 
+/** Error the processor records on a tool part still pending or running when its generation closes. */
+export const TOOL_ABORTED_ERROR = "Tool execution aborted"
+
+/**
+ * A tool part closed as aborted after the session's own abort signal fired (Stop/Esc, dispose)
+ * is a requested cancellation, already recorded as the session's "aborted" outcome; it is not a
+ * tool failure. The same error without a session abort is unexpected and is still reported.
+ */
+export function isRequestedToolAbort(error: unknown, sessionAborted: boolean): boolean {
+  return sessionAborted && error === TOOL_ABORTED_ERROR
+}
+
 export function buildErrorFingerprintEvent(
   sessionID: string,
   err: {
diff --git a/packages/opencode/src/session/processor.ts b/packages/opencode/src/session/processor.ts
index bcbbabca6a..0d7f7655a2 100644
--- a/packages/opencode/src/session/processor.ts
+++ b/packages/opencode/src/session/processor.ts
@@ -27,6 +27,7 @@ import { PartID } from "./schema"
 import type { SessionID, MessageID } from "./schema"
 // altimate_change start — import Telemetry for per-generation token tracking
 import { Telemetry } from "@/altimate/telemetry"
+import { ErrorDetail } from "@/altimate/telemetry/error-detail" // altimate_change — shared aborted-tool error
 // altimate_change end
 // altimate_change start — write-starvation breaker + loop detection (fork-only
 // modules) and the run-mode flag that gates armed behavior.
@@ -80,7 +81,7 @@ async function interruptedToolPart(part: MessageV2.ToolPart, capTokens: number):
       },
     }
   }
-  return { ...part, state: { ...state, status: "error", error: "Tool execution aborted", metadata, time } }
+  return { ...part, state: { ...state, status: "error", error: ErrorDetail.TOOL_ABORTED_ERROR, metadata, time } }
 }
 // altimate_change end
 
diff --git a/packages/opencode/src/session/prompt.ts b/packages/opencode/src/session/prompt.ts
index f6e2c0c0f8..d7d65e3c8f 100644
--- a/packages/opencode/src/session/prompt.ts
+++ b/packages/opencode/src/session/prompt.ts
@@ -2194,6 +2194,9 @@ export namespace SessionPrompt {
         lastToolName = part.tool
         // altimate_change end
         if (toolChain.length < 50) toolChain.push(part.tool)
+        // altimate_change start — a tool the session's own abort interrupted is neither a failure nor a recovery
+        if (part.state?.status === "error" && ErrorDetail.isRequestedToolAbort(part.state.error, abort.aborted)) continue
+        // altimate_change end
         const isError = part.state?.status === "error"
         if (isError) {
           toolErrorCount++
diff --git a/packages/opencode/test/telemetry/requested-tool-abort.test.ts b/packages/opencode/test/telemetry/requested-tool-abort.test.ts
new file mode 100644
index 0000000000..2aa7ba090d
--- /dev/null
+++ b/packages/opencode/test/telemetry/requested-tool-abort.test.ts
@@ -0,0 +1,26 @@
+import { describe, expect, test } from "bun:test"
+import { ErrorDetail } from "../../src/altimate/telemetry/error-detail"
+
+const { TOOL_ABORTED_ERROR, describeToolError, isRequestedToolAbort } = ErrorDetail
+
+describe("isRequestedToolAbort", () => {
+  test("the aborted-tool error is the reported tool_error fingerprint", () => {
+    expect(describeToolError(TOOL_ABORTED_ERROR)).toEqual({
+      errorHash: "18cc068fbdbecb19",
+      errorMessage: "tool <x> aborted",
+    })
+  })
+
+  test("excludes a tool the session's own abort interrupted", () => {
+    expect(isRequestedToolAbort(TOOL_ABORTED_ERROR, true)).toBe(true)
+  })
+
+  test("still reports an aborted tool when the session did not request the abort", () => {
+    expect(isRequestedToolAbort(TOOL_ABORTED_ERROR, false)).toBe(false)
+  })
+
+  test("still reports other tool errors after a session abort", () => {
+    expect(isRequestedToolAbort("oldString not found in content", true)).toBe(false)
+    expect(isRequestedToolAbort(undefined, true)).toBe(false)
+  })
+})