diff --git "a/packages/provider-bridge-protocol/recordings/pi/turn-tools/bridge\342\206\222runtime.current.ndjson" "b/packages/provider-bridge-protocol/recordings/pi/turn-tools/bridge\342\206\222runtime.current.ndjson"
index 60a264a72e3..0b08c43a6e8 100644
--- "a/packages/provider-bridge-protocol/recordings/pi/turn-tools/bridge\342\206\222runtime.current.ndjson"
+++ "b/packages/provider-bridge-protocol/recordings/pi/turn-tools/bridge\342\206\222runtime.current.ndjson"
@@ -7,8 +7,8 @@
 {"ts":1787347885004,"run":1787347884248,"seq":10.181818181818182,"dir":"bridge→runtime","line":"{\"jsonrpc\":\"2.0\",\"method\":\"thread/delta\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"deltas\":[{\"kind\":\"item.open\",\"key\":{\"providerItemId\":\"call_3QgildbOHVjGT66p1suULaki|fc_09c945c948332c68016a88c3ae95cc87d0807292b80067b702\"},\"item\":{\"type\":\"tool\",\"tool\":\"read\",\"args\":{\"path\":\"math.js\"}},\"noTurnFallback\":{\"raw\":{\"jsonrpc\":\"2.0\",\"method\":\"sdk/message\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"message\":{\"type\":\"tool_execution_start\",\"toolCallId\":\"call_3QgildbOHVjGT66p1suULaki|fc_09c945c948332c68016a88c3ae95cc87d0807292b80067b702\",\"toolName\":\"read\",\"args\":{\"path\":\"math.js\"}}}},\"rawType\":\"sdk/tool_execution_start\"}}]}}"}
 {"ts":1787347885005,"run":1787347884248,"seq":10.227272727272727,"dir":"bridge→runtime","line":"{\"jsonrpc\":\"2.0\",\"method\":\"thread/delta\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"deltas\":[{\"kind\":\"item.close\",\"key\":{\"providerItemId\":\"call_3QgildbOHVjGT66p1suULaki|fc_09c945c948332c68016a88c3ae95cc87d0807292b80067b702\"},\"status\":\"completed\",\"resultText\":\"export function add(a, b) {\\n  return a + b;\\n}\\n\",\"exitCode\":0,\"item\":{\"type\":\"tool\",\"tool\":\"read\",\"args\":{\"path\":\"math.js\"}},\"noTurnFallback\":{\"raw\":{\"jsonrpc\":\"2.0\",\"method\":\"sdk/message\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"message\":{\"type\":\"tool_execution_end\",\"toolCallId\":\"call_3QgildbOHVjGT66p1suULaki|fc_09c945c948332c68016a88c3ae95cc87d0807292b80067b702\",\"toolName\":\"read\",\"result\":{\"content\":[{\"type\":\"text\",\"text\":\"export function add(a, b) {\\n  return a + b;\\n}\\n\"}]},\"isError\":false}}},\"rawType\":\"sdk/tool_execution_end\"}}]}}"}
 {"ts":1787347885006,"run":1787347884248,"seq":10.272727272727273,"dir":"bridge→runtime","line":"{\"jsonrpc\":\"2.0\",\"method\":\"thread/delta\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"deltas\":[{\"kind\":\"contextWindow\",\"used\":3546,\"size\":272000,\"estimated\":true,\"attach\":\"currentOrLast\"}]}}"}
-{"ts":1787347885007,"run":1787347884248,"seq":10.318181818181818,"dir":"bridge→runtime","line":"{\"jsonrpc\":\"2.0\",\"method\":\"thread/delta\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"deltas\":[{\"kind\":\"item.open\",\"key\":{\"providerItemId\":\"call_wawtqW4IaZ4neYkDnjgiA3RK|fc_09c945c948332c68016a88c3b065f087d0a620114e3315fc05\"},\"item\":{\"type\":\"fileChange\",\"changes\":[{\"path\":\"math.js\",\"kind\":\"add\"}]},\"noTurnFallback\":{\"raw\":{\"jsonrpc\":\"2.0\",\"method\":\"sdk/message\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"message\":{\"type\":\"tool_execution_start\",\"toolCallId\":\"call_wawtqW4IaZ4neYkDnjgiA3RK|fc_09c945c948332c68016a88c3b065f087d0a620114e3315fc05\",\"toolName\":\"edit\",\"args\":{\"path\":\"math.js\",\"edits\":[{\"oldText\":\"export function add(a, b) {\\n  return a + b;\\n}\\n\",\"newText\":\"export function add(a, b) {\\n  return a + b;\\n}\\n\\nexport function subtract(a, b) {\\n  return a - b;\\n}\\n\"}]}}}},\"rawType\":\"sdk/tool_execution_start\"}}]}}"}
-{"ts":1787347885008,"run":1787347884248,"seq":10.363636363636363,"dir":"bridge→runtime","line":"{\"jsonrpc\":\"2.0\",\"method\":\"thread/delta\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"deltas\":[{\"kind\":\"item.close\",\"key\":{\"providerItemId\":\"call_wawtqW4IaZ4neYkDnjgiA3RK|fc_09c945c948332c68016a88c3b065f087d0a620114e3315fc05\"},\"status\":\"completed\",\"resultText\":\"Successfully replaced 1 block(s) in math.js.\",\"exitCode\":0,\"item\":{\"type\":\"fileChange\",\"changes\":[{\"path\":\"math.js\",\"kind\":\"add\"}]},\"noTurnFallback\":{\"raw\":{\"jsonrpc\":\"2.0\",\"method\":\"sdk/message\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"message\":{\"type\":\"tool_execution_end\",\"toolCallId\":\"call_wawtqW4IaZ4neYkDnjgiA3RK|fc_09c945c948332c68016a88c3b065f087d0a620114e3315fc05\",\"toolName\":\"edit\",\"result\":{\"content\":[{\"type\":\"text\",\"text\":\"Successfully replaced 1 block(s) in math.js.\"}],\"details\":{\"diff\":\" 1 export function add(a, b) {\\n 2   return a + b;\\n 3 }\\n+4 \\n+5 export function subtract(a, b) {\\n+6   return a - b;\\n+7 }\",\"patch\":\"--- math.js\\n+++ math.js\\n@@ -1,3 +1,7 @@\\n export function add(a, b) {\\n   return a + b;\\n }\\n+\\n+export function subtract(a, b) {\\n+  return a - b;\\n+}\\n\",\"firstChangedLine\":4}},\"isError\":false}}},\"rawType\":\"sdk/tool_execution_end\"}}]}}"}
+{"ts":1787347885007,"run":1787347884248,"seq":10.318181818181818,"dir":"bridge→runtime","line":"{\"jsonrpc\":\"2.0\",\"method\":\"thread/delta\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"deltas\":[{\"kind\":\"item.open\",\"key\":{\"providerItemId\":\"call_wawtqW4IaZ4neYkDnjgiA3RK|fc_09c945c948332c68016a88c3b065f087d0a620114e3315fc05\"},\"item\":{\"type\":\"fileChange\",\"changes\":[{\"path\":\"math.js\",\"kind\":\"update\"}]},\"noTurnFallback\":{\"raw\":{\"jsonrpc\":\"2.0\",\"method\":\"sdk/message\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"message\":{\"type\":\"tool_execution_start\",\"toolCallId\":\"call_wawtqW4IaZ4neYkDnjgiA3RK|fc_09c945c948332c68016a88c3b065f087d0a620114e3315fc05\",\"toolName\":\"edit\",\"args\":{\"path\":\"math.js\",\"edits\":[{\"oldText\":\"export function add(a, b) {\\n  return a + b;\\n}\\n\",\"newText\":\"export function add(a, b) {\\n  return a + b;\\n}\\n\\nexport function subtract(a, b) {\\n  return a - b;\\n}\\n\"}]}}}},\"rawType\":\"sdk/tool_execution_start\"}}]}}"}
+{"ts":1787347885008,"run":1787347884248,"seq":10.363636363636363,"dir":"bridge→runtime","line":"{\"jsonrpc\":\"2.0\",\"method\":\"thread/delta\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"deltas\":[{\"kind\":\"item.close\",\"key\":{\"providerItemId\":\"call_wawtqW4IaZ4neYkDnjgiA3RK|fc_09c945c948332c68016a88c3b065f087d0a620114e3315fc05\"},\"status\":\"completed\",\"resultText\":\"Successfully replaced 1 block(s) in math.js.\",\"exitCode\":0,\"item\":{\"type\":\"fileChange\",\"changes\":[{\"path\":\"math.js\",\"kind\":\"update\"}]},\"noTurnFallback\":{\"raw\":{\"jsonrpc\":\"2.0\",\"method\":\"sdk/message\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"message\":{\"type\":\"tool_execution_end\",\"toolCallId\":\"call_wawtqW4IaZ4neYkDnjgiA3RK|fc_09c945c948332c68016a88c3b065f087d0a620114e3315fc05\",\"toolName\":\"edit\",\"result\":{\"content\":[{\"type\":\"text\",\"text\":\"Successfully replaced 1 block(s) in math.js.\"}],\"details\":{\"diff\":\" 1 export function add(a, b) {\\n 2   return a + b;\\n 3 }\\n+4 \\n+5 export function subtract(a, b) {\\n+6   return a - b;\\n+7 }\",\"patch\":\"--- math.js\\n+++ math.js\\n@@ -1,3 +1,7 @@\\n export function add(a, b) {\\n   return a + b;\\n }\\n+\\n+export function subtract(a, b) {\\n+  return a - b;\\n+}\\n\",\"firstChangedLine\":4}},\"isError\":false}}},\"rawType\":\"sdk/tool_execution_end\"}}]}}"}
 {"ts":1787347885009,"run":1787347884248,"seq":10.409090909090908,"dir":"bridge→runtime","line":"{\"jsonrpc\":\"2.0\",\"method\":\"thread/delta\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"deltas\":[{\"kind\":\"contextWindow\",\"used\":3656,\"size\":272000,\"estimated\":true,\"attach\":\"currentOrLast\"}]}}"}
 {"ts":1787347885010,"run":1787347884248,"seq":10.454545454545455,"dir":"bridge→runtime","line":"{\"jsonrpc\":\"2.0\",\"method\":\"thread/delta\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"deltas\":[{\"kind\":\"item.open\",\"key\":{\"providerItemId\":\"call_WvPlJkWmGzqSANq2hX6wgubH|fc_09c945c948332c68016a88c3b2c3a487d0b31e55957fcd3985\"},\"item\":{\"type\":\"command\",\"command\":\"node -e \\\"import(\\\\\\\"./math.js\\\\\\\").then(m => console.log(m.subtract(5, 3)))\\\"\",\"cwd\":\"/tmp/bb-recording-ws\"},\"noTurnFallback\":{\"raw\":{\"jsonrpc\":\"2.0\",\"method\":\"sdk/message\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"message\":{\"type\":\"tool_execution_start\",\"toolCallId\":\"call_WvPlJkWmGzqSANq2hX6wgubH|fc_09c945c948332c68016a88c3b2c3a487d0b31e55957fcd3985\",\"toolName\":\"bash\",\"args\":{\"command\":\"node -e \\\"import(\\\\\\\"./math.js\\\\\\\").then(m => console.log(m.subtract(5, 3)))\\\"\"}}}},\"rawType\":\"sdk/tool_execution_start\"}}]}}"}
 {"ts":1787347885011,"run":1787347884248,"seq":10.5,"dir":"bridge→runtime","line":"{\"jsonrpc\":\"2.0\",\"method\":\"thread/delta\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"deltas\":[{\"kind\":\"command.outputSnapshot\",\"key\":{\"providerItemId\":\"call_WvPlJkWmGzqSANq2hX6wgubH|fc_09c945c948332c68016a88c3b2c3a487d0b31e55957fcd3985\"},\"text\":\"2\\n\",\"noTurnFallback\":{\"raw\":{\"jsonrpc\":\"2.0\",\"method\":\"sdk/message\",\"params\":{\"threadId\":\"thr_xc2ssvyvdk\",\"message\":{\"type\":\"tool_execution_update\",\"toolCallId\":\"call_WvPlJkWmGzqSANq2hX6wgubH|fc_09c945c948332c68016a88c3b2c3a487d0b31e55957fcd3985\",\"toolName\":\"bash\",\"partialResult\":{\"content\":[{\"type\":\"text\",\"text\":\"2\\n\"}],\"details\":{}},\"args\":{\"command\":\"node -e \\\"import(\\\\\\\"./math.js\\\\\\\").then(m => console.log(m.subtract(5, 3)))\\\"\"}}}},\"rawType\":\"sdk/tool_execution_update\"}}]}}"}
diff --git a/plugins/provider-pi/src/delta-translation.test.ts b/plugins/provider-pi/src/delta-translation.test.ts
index ca761ec0842..7d0dbd98dcf 100644
--- a/plugins/provider-pi/src/delta-translation.test.ts
+++ b/plugins/provider-pi/src/delta-translation.test.ts
@@ -1104,6 +1104,31 @@ describe("pi delta translation equivalence", () => {
     );
   });
 
+  it("tool_execution_start with edit batch args marks the change as an update", () => {
+    const harness = createHarness();
+    harness.translate(loadFixture("agent-start.json"));
+
+    const events = harness.translate({
+      type: "tool_execution_start",
+      toolCallId: "tool-edit-batch",
+      toolName: "edit",
+      args: {
+        path: "src/app.ts",
+        edits: [{ oldText: "before", newText: "after" }],
+      },
+    } as AgentSessionEvent);
+
+    const started = events.find(
+      (event): event is Extract<ThreadEvent, { type: "item/started" }> =>
+        event.type === "item/started",
+    );
+    expect(started?.item).toMatchObject({
+      type: "fileChange",
+      status: "pending",
+      changes: [{ path: "src/app.ts", kind: "update" }],
+    });
+  });
+
   it("tool_execution_start with content-only write args marks the change as an add", () => {
     const harness = createHarness();
     harness.translate(loadFixture("agent-start.json"));
diff --git a/plugins/provider-pi/src/delta-translation.ts b/plugins/provider-pi/src/delta-translation.ts
index 1a889c3b89d..707881e870c 100644
--- a/plugins/provider-pi/src/delta-translation.ts
+++ b/plugins/provider-pi/src/delta-translation.ts
@@ -257,7 +257,10 @@ function classifyPiToolUse(
       changes: [
         {
           path: parsed.data.path,
-          kind: parsed.data.oldText === undefined ? "add" : "update",
+          kind:
+            toolName === "edit" || parsed.data.oldText !== undefined
+              ? "update"
+              : "add",
           ...(parsed.data.oldText === undefined
             ? {}
             : { oldText: parsed.data.oldText }),