fix: preserve interrupted bash output in tool results (#21598)

packages/opencode/test/session/message-v2.test.ts

@@ -570,6 +570,81 @@ describe("session.message-v2.toModelMessage", () => {
     ])
   })
 
+  test("forwards partial bash output for aborted tool calls", async () => {
+    const userID = "m-user"
+    const assistantID = "m-assistant"
+    const output = [
+      "31403",
+      "12179",
+      "4575",
+      "",
+      "<bash_metadata>",
+      "User aborted the command",
+      "</bash_metadata>",
+    ].join("\n")
+
+    const input: MessageV2.WithParts[] = [
+      {
+        info: userInfo(userID),
+        parts: [
+          {
+            ...basePart(userID, "u1"),
+            type: "text",
+            text: "run tool",
+          },
+        ] as MessageV2.Part[],
+      },
+      {
+        info: assistantInfo(assistantID, userID),
+        parts: [
+          {
+            ...basePart(assistantID, "a1"),
+            type: "tool",
+            callID: "call-1",
+            tool: "bash",
+            state: {
+              status: "error",
+              input: { command: "for i in {1..20}; do print -- $RANDOM; sleep 1; done" },
+              error: "Tool execution aborted",
+              metadata: { interrupted: true, output },
+              time: { start: 0, end: 1 },
+            },
+          },
+        ] as MessageV2.Part[],
+      },
+    ]
+
+    expect(await MessageV2.toModelMessages(input, model)).toStrictEqual([
+      {
+        role: "user",
+        content: [{ type: "text", text: "run tool" }],
+      },
+      {
+        role: "assistant",
+        content: [
+          {
+            type: "tool-call",
+            toolCallId: "call-1",
+            toolName: "bash",
+            input: { command: "for i in {1..20}; do print -- $RANDOM; sleep 1; done" },
+            providerExecuted: undefined,
+          },
+        ],
+      },
+      {
+        role: "tool",
+        content: [
+          {
+            type: "tool-result",
+            toolCallId: "call-1",
+            toolName: "bash",
+            output: { type: "text", value: output },
+          },
+        ],
+      },
+    ])
+  })
+
   test("filters assistant messages with non-abort errors", async () => {
     const assistantID = "m-assistant"
 

packages/opencode/test/session/processor-effect.test.ts

@@ -604,6 +604,7 @@ it.live("session.processor effect tests mark pending tools as aborted on cleanup
         expect(call?.state.status).toBe("error")
         if (call?.state.status === "error") {
           expect(call.state.error).toBe("Tool execution aborted")
+          expect(call.state.metadata?.interrupted).toBe(true)
           expect(call.state.time.end).toBeDefined()
         }
       }),