diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-pi-durable/package.json b/dev-packages/e2e-tests/test-applications/cloudflare-pi-durable/package.json
index 6699912023e6..80c16c600e11 100644
--- a/dev-packages/e2e-tests/test-applications/cloudflare-pi-durable/package.json
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-pi-durable/package.json
@@ -12,8 +12,8 @@
     "test:assert": "playwright test"
   },
   "dependencies": {
-    "@earendil-works/pi-ai": "1.0.0",
-    "@earendil-works/pi-durable": "1.0.0",
+    "@earendil-works/pi-ai": "1.2.0",
+    "@earendil-works/pi-durable": "1.2.0",
     "@sentry/cloudflare": "file:../../packed/sentry-cloudflare-packed.tgz",
     "agents": "0.26.0"
   },
diff --git a/dev-packages/e2e-tests/test-applications/cloudflare-pi-durable/src/assistant.ts b/dev-packages/e2e-tests/test-applications/cloudflare-pi-durable/src/assistant.ts
index bd0d25a8c5b3..93e1236190cf 100644
--- a/dev-packages/e2e-tests/test-applications/cloudflare-pi-durable/src/assistant.ts
+++ b/dev-packages/e2e-tests/test-applications/cloudflare-pi-durable/src/assistant.ts
@@ -47,7 +47,7 @@ export class Assistant extends Agent<Env> {
             // The manual span should nest under the SDK's `execute_tool` span.
             execute: async args =>
               Sentry.startSpan({ name: 'resolve-weather', attributes: { 'weather.city': args.city } }, () => ({
-                content: [{ type: 'text', text: `It is 21 degrees and sunny in ${args.city}.` }],
+                output: [{ type: 'text', text: `It is 21 degrees and sunny in ${args.city}.` }],
               })),
           }),
           defineTool({
@@ -67,7 +67,7 @@ export class Assistant extends Agent<Env> {
             execute: async args => {
               const marker = `crashed:${args.job}`;
               if (await this.ctx.storage.get(marker)) {
-                return { content: [{ type: 'text', text: `Step of job ${args.job} completed.` }] };
+                return { output: [{ type: 'text', text: `Step of job ${args.job} completed.` }] };
               }
               await this.ctx.storage.put(marker, true);
               await this.ctx.storage.sync();
diff --git a/dev-packages/e2e-tests/test-applications/node-pi-durable/package.json b/dev-packages/e2e-tests/test-applications/node-pi-durable/package.json
index eb9822667b3a..33bc22b4e00f 100644
--- a/dev-packages/e2e-tests/test-applications/node-pi-durable/package.json
+++ b/dev-packages/e2e-tests/test-applications/node-pi-durable/package.json
@@ -11,9 +11,9 @@
     "test:assert": "OPENROUTER_API_KEY=$E2E_OPENROUTER_API_KEY playwright test"
   },
   "dependencies": {
-    "@earendil-works/chord": "1.0.0",
-    "@earendil-works/pi-ai": "1.0.0",
-    "@earendil-works/pi-durable": "1.0.0",
+    "@earendil-works/chord": "1.2.0",
+    "@earendil-works/pi-ai": "1.2.0",
+    "@earendil-works/pi-durable": "1.2.0",
     "@sentry/node": "file:../../packed/sentry-node-packed.tgz"
   },
   "devDependencies": {
diff --git a/dev-packages/e2e-tests/test-applications/node-pi-durable/src/server.mjs b/dev-packages/e2e-tests/test-applications/node-pi-durable/src/server.mjs
index 79892991f03d..c71c9f4096bf 100644
--- a/dev-packages/e2e-tests/test-applications/node-pi-durable/src/server.mjs
+++ b/dev-packages/e2e-tests/test-applications/node-pi-durable/src/server.mjs
@@ -38,7 +38,7 @@ const tools = [
     // The manual span should nest under the SDK's `execute_tool` span.
     execute: async args =>
       Sentry.startSpan({ name: 'resolve-weather', attributes: { 'weather.city': args.city } }, () => ({
-        content: [{ type: 'text', text: `It is 21 degrees and sunny in ${args.city}.` }],
+        output: [{ type: 'text', text: `It is 21 degrees and sunny in ${args.city}.` }],
       })),
   }),
   defineTool({
@@ -60,7 +60,7 @@ const tools = [
       try {
         writeFileSync(`${dataDir}crashed-${args.job}`, 'crashed once', { flag: 'wx' });
       } catch {
-        return { content: [{ type: 'text', text: `Step of job ${args.job} completed.` }] };
+        return { output: [{ type: 'text', text: `Step of job ${args.job} completed.` }] };
       }
       process.exit(CRASH_EXIT_CODE);
     },
@@ -80,14 +80,14 @@ const tools = [
       const request = { type: 'input', content: args.task, requestId: `delegate:${api.taskId}` };
       const settled = await (await child.submit(request, toolContext)).wait(toolContext);
       if (settled.status !== 'done') {
-        return { isError: true, content: [{ type: 'text', text: `Subagent ended: ${settled.reason}` }] };
+        return { isError: true, output: [{ type: 'text', text: `Subagent ended: ${settled.reason}` }] };
       }
       const answer = await api.commit(tx => tx.entry(AssistantEntry, settled.answer), toolContext);
       const text = (answer?.model?.[0]?.content ?? [])
         .filter(part => part.type === 'text')
         .map(part => part.text)
         .join('');
-      return { content: [{ type: 'text', text }] };
+      return { output: [{ type: 'text', text }] };
     },
   }),
 ];
diff --git a/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-interrupted.mjs b/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-interrupted.mjs
index f0efbea32483..9d15ed6f3a47 100644
--- a/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-interrupted.mjs
+++ b/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-interrupted.mjs
@@ -65,7 +65,7 @@ registry.install(
           await new Promise((_, reject) =>
             toolContext.abortSignal.addEventListener('abort', () => reject(new Error('tool aborted'))),
           );
-          return { content: [] };
+          return { output: [] };
         },
       }),
     ],
diff --git a/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-retention.mjs b/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-retention.mjs
index dc84d6387ba9..8887587a07c2 100644
--- a/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-retention.mjs
+++ b/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-retention.mjs
@@ -46,7 +46,7 @@ registry.install(
             tx => tx.createConversation({ ownership: { kind: 'task', taskId: api.taskId } }),
             toolContext,
           );
-          return { content: [{ type: 'text', text: 'Subagent created.' }] };
+          return { output: [{ type: 'text', text: 'Subagent created.' }] };
         },
       }),
     ],
diff --git a/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-subagent.mjs b/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-subagent.mjs
index da80b508f252..7e6f3413d3dd 100644
--- a/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-subagent.mjs
+++ b/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-subagent.mjs
@@ -70,7 +70,7 @@ registry.install(
           const settled = await (
             await child.submit({ type: 'input', content: args.task }, toolContext)
           ).wait(toolContext);
-          return { content: [{ type: 'text', text: await answerText(api, settled, toolContext) }] };
+          return { output: [{ type: 'text', text: await answerText(api, settled, toolContext) }] };
         },
       }),
       defineTool({
@@ -89,14 +89,14 @@ registry.install(
           const settled = await (
             await child.submit({ type: 'input', content: 'Forked task.' }, toolContext)
           ).wait(toolContext);
-          return { content: [{ type: 'text', text: await answerText(api, settled, toolContext) }] };
+          return { output: [{ type: 'text', text: await answerText(api, settled, toolContext) }] };
         },
       }),
       defineTool({
         name: 'inner',
         description: 'A plain tool.',
         parameters: Type.Object({}),
-        execute: async () => ({ content: [{ type: 'text', text: 'INNER RESULT' }] }),
+        execute: async () => ({ output: [{ type: 'text', text: 'INNER RESULT' }] }),
       }),
       defineTool({
         name: 'batch',
@@ -105,7 +105,7 @@ registry.install(
         execute: async (_args, api, toolContext) => {
           const inner = (await api.agent(toolContext)).tools.find(tool => tool.name === 'inner');
           await inner.execute({}, api, toolContext);
-          return { content: [{ type: 'text', text: 'OUTER RESULT' }] };
+          return { output: [{ type: 'text', text: 'OUTER RESULT' }] };
         },
       }),
     ],
diff --git a/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-tools.mjs b/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-tools.mjs
index fc42ebf2091f..fd8a977149fc 100644
--- a/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-tools.mjs
+++ b/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario-tools.mjs
@@ -73,7 +73,7 @@ registry.install(
         name: 'secret',
         description: 'Returns a secret.',
         parameters: Type.Object({}),
-        execute: async () => ({ content: [{ type: 'text', text: 'original secret value' }] }),
+        execute: async () => ({ output: [{ type: 'text', text: 'original secret value' }] }),
       }),
       defineTool({
         name: 'fail_now',
@@ -87,9 +87,7 @@ registry.install(
     hooks: [
       hook(ToolTask, {
         afterTool: (call, result) =>
-          call.name === 'secret'
-            ? { ...result, content: [{ type: 'text', text: 'redacted by afterTool' }] }
-            : undefined,
+          call.name === 'secret' ? { ...result, output: [{ type: 'text', text: 'redacted by afterTool' }] } : undefined,
       }),
     ],
   }),
diff --git a/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario.mjs b/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario.mjs
index 42309d5ba2d4..4c2dc1c87172 100644
--- a/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario.mjs
+++ b/dev-packages/node-integration-tests/suites/tracing/pi-durable/scenario.mjs
@@ -38,7 +38,7 @@ registry.install(
         name: 'get_weather',
         description: 'Get the current weather for a city.',
         parameters: Type.Object({ city: Type.String() }),
-        execute: async args => ({ content: [{ type: 'text', text: `It is 21 degrees and sunny in ${args.city}.` }] }),
+        execute: async args => ({ output: [{ type: 'text', text: `It is 21 degrees and sunny in ${args.city}.` }] }),
       }),
       defineTool({
         name: 'broken',
diff --git a/dev-packages/node-integration-tests/suites/tracing/pi-durable/test.ts b/dev-packages/node-integration-tests/suites/tracing/pi-durable/test.ts
index 4333c9e0f415..068b389c60d2 100644
--- a/dev-packages/node-integration-tests/suites/tracing/pi-durable/test.ts
+++ b/dev-packages/node-integration-tests/suites/tracing/pi-durable/test.ts
@@ -30,9 +30,9 @@ import { cleanupChildProcesses, createEsmAndCjsTests } from '../../../utils/runn
 // instead, guarded by the `min: 22` skip below.
 const PI_DURABLE_DEPENDENCIES = {
   additionalDependencies: {
-    '@earendil-works/pi-durable': '^1.0.0',
-    '@earendil-works/pi-ai': '^1.0.0',
-    '@earendil-works/chord': '^1.0.0',
+    '@earendil-works/pi-durable': '^1.2.0',
+    '@earendil-works/pi-ai': '^1.2.0',
+    '@earendil-works/chord': '^1.2.0',
   },
 };
 
diff --git a/packages/server-utils/src/ai/pi-durable/tools.ts b/packages/server-utils/src/ai/pi-durable/tools.ts
index 5d19f583dc14..8ccf21155549 100644
--- a/packages/server-utils/src/ai/pi-durable/tools.ts
+++ b/packages/server-utils/src/ai/pi-durable/tools.ts
@@ -138,7 +138,7 @@ export function instrumentTool(tool: PiTool, runs: PiRuns, options: GenAiOptions
           call.endTimestamp = timestampInSeconds();
           if (!calls) {
             // No result entry follows a call outside a tool task phase, nor a nested call.
-            finishToolCall(call, { content: result?.content, isError: result?.isError });
+            finishToolCall(call, { content: result?.output ?? result?.content, isError: result?.isError });
           }
           return result;
         } catch (error) {
diff --git a/packages/server-utils/src/ai/pi-durable/types.ts b/packages/server-utils/src/ai/pi-durable/types.ts
index 6244b18af1e5..7c87317eb26a 100644
--- a/packages/server-utils/src/ai/pi-durable/types.ts
+++ b/packages/server-utils/src/ai/pi-durable/types.ts
@@ -50,6 +50,9 @@ export interface PiModels {
 }
 
 export interface PiToolExecutionResult {
+  /** The content blocks the tool returns for the model, in pi-durable 1.2.0 and later. */
+  output?: unknown[];
+  /** The content blocks the tool returns for the model, in pi-durable versions before 1.2.0. */
   content?: unknown[];
   isError?: boolean;
 }
diff --git a/packages/server-utils/test/ai/lib/tracing/pi-durable.test.ts b/packages/server-utils/test/ai/lib/tracing/pi-durable.test.ts
index c2b8f6e9b68e..d23b3310785e 100644
--- a/packages/server-utils/test/ai/lib/tracing/pi-durable.test.ts
+++ b/packages/server-utils/test/ai/lib/tracing/pi-durable.test.ts
@@ -617,6 +617,17 @@ describe('instrumentPiDurableHarnessOptions', () => {
       });
     });
 
+    it('reads the result of a call outside a tool phase from `output`', async () => {
+      const tool: PiTool = {
+        name: 'get_weather',
+        execute: async () => ({ output: [{ type: 'text', text: 'sunny' }] }),
+      };
+
+      await instrumentTool(tool, createRuns(), {}).execute({}, { callId: 'call_1' }, undefined);
+
+      expect(spanToJSON(endedSpans[0]!).attributes[GEN_AI_TOOL_CALL_RESULT]).toBe('sunny');
+    });
+
     it.each([
       ['no content blocks', []],
       ['an empty text block', [{ type: 'text', text: '' }]],