feat(agents): add the named browser session core by ben-reitz · Pull Request #2302 · cloudflare/agents

ben-reitz · 2026-09-18T10:04:34Z

What this is

A host-side session engine. You name a browser and get a live Browser Run session for it.

  resolve("checkout")
    none yet            → create                 restarted: false
    alive               → return it              restarted: false
    dead/closed/swept   → create a replacement   restarted: true

connect(name) = resolve + open the CDP socket.

Why

Today the model manages browser lifetime inside browser_execute (cdp.startSession(), sessionInfo(), carrying raw ids), and evals showed that's where it fails most. This moves lifetime host-side. Nothing model-facing changes here: browser_execute is untouched, and wiring it to named sessions comes later in the stack.

Behavior

No platform ids for the model. Hosts see sessionId; models never will.
Restarts are loud. A replaced browser reports restarted: true instead of silently appearing blank.
Settings survive replacement. keepAliveMs (default: 600s platform max), recording, and guardrails are stored and reapplied on every create.
Durable cleanup. close() tombstones durably, then deletes best-effort. sweep() closes browsers idle longer than sweepIdleMs (10 min) and prunes old tombstones. Alarm scheduling is in feat(agents): add the browser-sessions Lifecycle capability #2293.
Busy browsers aren't swept. Each CDP send refreshes the idle clock, throttled to at most half the sweep window.
Races report restarts. Dead sessions are tombstoned during replacement, so concurrent resolvers both see restarted: true.
One-shot is still an option. openOneShotBrowserSession() is create-use-delete with no store, and it's the only path for Kitesurf right now.

Storage uses browser:session:<name>, separate from the connector's existing cdp:exec:/cdp:reuse: keys.

Public API (`agents/browser`)

 createBrowserSession(browser, { keepAliveMs, includeTargets, recording,
+  guardrails })                                  // acquire now always sends JSON ({} if none)
-connectBrowserSession(browser, id, timeoutMs)    // still works, @deprecated
+connectBrowserSession(browser, id, { timeoutMs, onClose, onActivity })
-new CdpSession(ws, timeoutMs, dispose, sessionId)
+new CdpSession(ws, { timeoutMs, onClose, sessionId, onActivity })  // breaking for direct construction
 connectBrowser(browser, options)                 // options: engine-discriminated union;
                                                  // kitesurf rejects Chromium-only options at compile time

Type exports and the changeset are in #2294.

Reviewing

session-core.ts reads top to bottom: resolve → connect → close → sweep → one-shot. 23 tests in browser-session-core.test.ts; compile-time option checks in tests-d/browser-engine-options.test-d.ts.

Extra: where this is heading

Where this is heading

Before

This is today, with dynamic mode enabled. The model owns both the Browser Run platform session AND the CDP session:

  // ── browser_execute #1: log in, keep the browser ──────────────
  // target ceremony (every execution)
  const { targetInfos } = await cdp.send("Target.getTargets");
  const page = targetInfos.find((t) => t.type === "page");
  const { sessionId } = await cdp.attachToTarget({ targetId: page.targetId });

  await cdp.send("Page.navigate", { url: "https://shop.example/login" }, { sessionId });
  // ...fill form, submit, all with { sessionId }...

  // if the model forgets to do this next bit, then the logged-in browser is
  // deleted when this execution ends
  await cdp.startSession();

  // ── browser_execute #2: later turn ─────────────────────────────
  await cdp.sessionInfo();                       // is my browser still there?
  const { targetInfos } = await cdp.send("Target.getTargets");   // re-discover
  const page = targetInfos.find((t) => t.type === "page");
  const { sessionId } = await cdp.attachToTarget({ targetId: page.targetId }); // re-attach
  await cdp.send("Page.navigate", { url: "https://shop.example/checkout" }, { sessionId });

  // ...and eventually, if it remembers:
  await cdp.closeSession();

After

Target state: both Browser Run and CDP lifecycle management gone from the model's code:

  // ── browser_execute #1: log in ─────────────────────────────────
  await cdp.send("Page.navigate", { url: "https://shop.example/login" }, { sessionId: "active" });
  // ...fill form, submit, all with { sessionId: "active" }...
  // nothing else — persistence isn't the model's decision

  // ── browser_execute #2: later turn, same browser, still logged in ──
  await cdp.send("Page.navigate", { url: "https://shop.example/checkout" }, { sessionId: "active" });
  // if the browser had died meanwhile, the result envelope says "sessionRestarted: true"
  //  and the model knows to log in again

changeset-bot · 2026-09-18T10:04:39Z

⚠️ No Changeset found

Latest commit: ff32623

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agent-think · 2026-09-18T10:06:47Z

🟡 agents import sizes

Measured 344 runtime imports as minified bundles. The primary size is gzip; raw minified size is included for diagnosis. An existing import growing by more than 10% is marked red. This report is informational.

Red	Yellow	Green	Unchanged	New	Removed
0	10	0	334	0	0

Compared 5848d71b with ff32623b. Open workflow run.

Changed imports (10)

Status	Import	Base gzip	Head gzip	Delta
🟡	`agents/browser#BrowserConnector`	50.5 KiB	50.6 KiB	+180 B (+0.35%)
🟡	`agents/browser#connectBrowserSession`	37.5 KiB	37.6 KiB	+131 B (+0.34%)
🟡	`agents/browser#connectBrowser`	37.8 KiB	37.9 KiB	+118 B (+0.3%)
🟡	`agents/browser#connectUrl`	37.6 KiB	37.7 KiB	+100 B (+0.26%)
🟡	`agents/browser#CdpSession`	37.2 KiB	37.3 KiB	+95 B (+0.25%)
🟡	`agents/browser#createBrowserSession`	36.3 KiB	36.4 KiB	+58 B (+0.16%)
🟡	`agents/browser/ai#createBrowserRuntime`	147.0 KiB	147.2 KiB	+160 B (+0.11%)
🟡	`agents/browser/ai#createBrowserTools`	147.0 KiB	147.2 KiB	+160 B (+0.11%)
🟡	`agents/browser/tanstack-ai#createBrowserTools`	162.7 KiB	162.9 KiB	+151 B (+0.09%)
🟡	`agents/browser#browserPdf`	36.3 KiB	36.3 KiB	+6 B (+0.02%)

All 344 current runtime imports

Status	Import	Gzip	Raw minified
⚪	`agents#__DO_NOT_USE_WILL_BREAK__agentContext`	261.1 KiB	1141.0 KiB
⚪	`agents#__DO_NOT_USE_WILL_BREAK__withInvocationScope`	261.1 KiB	1141.0 KiB
⚪	`agents#Agent`	261.1 KiB	1141.0 KiB
⚪	`agents#AGENT_TOOL_MILESTONE_PART`	261.1 KiB	1141.0 KiB
⚪	`agents#AGENT_TOOL_PROGRESS_PART`	261.1 KiB	1141.0 KiB
⚪	`agents#buildAgentPath`	261.7 KiB	1143.3 KiB
⚪	`agents#buildAgentUrl`	261.8 KiB	1143.7 KiB
⚪	`agents#callable`	261.1 KiB	1141.0 KiB
⚪	`agents#camelCaseToKebabCase`	261.1 KiB	1141.0 KiB
⚪	`agents#createHeaderBasedEmailResolver`	261.3 KiB	1141.4 KiB
⚪	`agents#DEFAULT_AGENT_STATIC_OPTIONS`	261.1 KiB	1141.0 KiB
⚪	`agents#DurableObjectOAuthClientProvider`	261.1 KiB	1141.0 KiB
⚪	`agents#getAgentByName`	261.1 KiB	1141.0 KiB
⚪	`agents#getCurrentAgent`	261.1 KiB	1141.0 KiB
⚪	`agents#getSubAgentByName`	261.4 KiB	1141.6 KiB
⚪	`agents#isDurableObjectCodeUpdateReset`	261.1 KiB	1141.0 KiB
⚪	`agents#isDurableObjectMemoryLimitReset`	261.1 KiB	1141.0 KiB
⚪	`agents#isDurableObjectStorageReset`	261.1 KiB	1141.0 KiB
⚪	`agents#isPlatformTransientError`	261.1 KiB	1141.0 KiB
⚪	`agents#MCP_SERVER_ID_MAX_LENGTH`	261.1 KiB	1141.0 KiB
⚪	`agents#MessageType`	261.2 KiB	1141.3 KiB
⚪	`agents#normalizeServerId`	261.1 KiB	1141.0 KiB
⚪	`agents#parseSubAgentPath`	261.1 KiB	1141.0 KiB
⚪	`agents#routeAgentEmail`	261.4 KiB	1141.7 KiB
⚪	`agents#routeAgentRequest`	261.7 KiB	1142.9 KiB
⚪	`agents#routeSubAgentRequest`	261.3 KiB	1141.5 KiB
⚪	`agents#SqlError`	261.1 KiB	1141.0 KiB
⚪	`agents#StreamingResponse`	261.1 KiB	1141.0 KiB
⚪	`agents#SUB_PREFIX`	261.1 KiB	1141.0 KiB
⚪	`agents#unstable_callable`	261.2 KiB	1141.2 KiB
⚪	`agents/agent-tools#agentTool`	112.5 KiB	538.2 KiB
🟡	`agents/browser#BrowserConnector`	50.6 KiB	177.2 KiB
⚪	`agents/browser#browserContent`	36.3 KiB	127.4 KiB
⚪	`agents/browser#browserExtract`	36.3 KiB	127.4 KiB
⚪	`agents/browser#browserLinks`	36.3 KiB	127.4 KiB
⚪	`agents/browser#browserMarkdown`	36.3 KiB	127.4 KiB
🟡	`agents/browser#browserPdf`	36.3 KiB	127.3 KiB
⚪	`agents/browser#BrowserRenderingError`	36.0 KiB	126.7 KiB
⚪	`agents/browser#browserScrape`	36.3 KiB	127.4 KiB
⚪	`agents/browser#browserScreenshot`	36.3 KiB	127.3 KiB
⚪	`agents/browser#browserSnapshot`	36.3 KiB	127.4 KiB
🟡	`agents/browser#CdpSession`	37.3 KiB	130.1 KiB
⚪	`agents/browser#CodemodeRuntime`	39.6 KiB	139.0 KiB
🟡	`agents/browser#connectBrowser`	37.9 KiB	131.7 KiB
🟡	`agents/browser#connectBrowserSession`	37.6 KiB	130.8 KiB
🟡	`agents/browser#connectUrl`	37.7 KiB	130.9 KiB
🟡	`agents/browser#createBrowserSession`	36.4 KiB	127.7 KiB
⚪	`agents/browser#DEFAULT_EXEC_SWEEP_IDLE_MS`	36.0 KiB	126.6 KiB
⚪	`agents/browser#DEFAULT_SWEEP_IDLE_MS`	36.0 KiB	126.6 KiB
⚪	`agents/browser#deleteBrowserSession`	36.1 KiB	126.9 KiB
⚪	`agents/browser#DurableBrowserSessionStore`	36.4 KiB	127.6 KiB
⚪	`agents/browser#getBrowserRecording`	36.2 KiB	127.1 KiB
⚪	`agents/browser#listBrowserTargets`	36.1 KiB	126.9 KiB
⚪	`agents/browser#loadCdpSpec`	36.6 KiB	128.3 KiB
⚪	`agents/browser#runQuickAction`	36.0 KiB	126.6 KiB
🟡	`agents/browser/ai#createBrowserRuntime`	147.2 KiB	633.5 KiB
🟡	`agents/browser/ai#createBrowserTools`	147.2 KiB	633.5 KiB
⚪	`agents/browser/ai#createQuickActionTools`	122.5 KiB	554.3 KiB
🟡	`agents/browser/tanstack-ai#createBrowserTools`	162.9 KiB	702.4 KiB
⚪	`agents/channels#ChannelHost`	3.3 KiB	9.1 KiB
⚪	`agents/channels#consumeChunks`	237 B	321 B
⚪	`agents/channels#createUserIdentityStore`	1.3 KiB	3.2 KiB
⚪	`agents/channels#fallback`	155 B	160 B
⚪	`agents/channels#fallbackChannel`	893 B	1.9 KiB
⚪	`agents/channels#fanout`	151 B	156 B
⚪	`agents/channels#fanoutChannel`	875 B	1.9 KiB
⚪	`agents/channels#identityKey`	178 B	223 B
⚪	`agents/channels#isChannelMessageSurface`	271 B	452 B
⚪	`agents/channels#linkChannelIdentities`	113 B	99 B
⚪	`agents/channels#matchesPath`	110 B	96 B
⚪	`agents/channels#routes`	307 B	507 B
⚪	`agents/channels#UserIdentityConflictError`	248 B	335 B
⚪	`agents/channels/ai-sdk#createSendMessageTool`	112.2 KiB	537.4 KiB
⚪	`agents/channels/ai-sdk#toChannelChunks`	112.5 KiB	538.4 KiB
⚪	`agents/channels/email#email`	23.5 KiB	75.4 KiB
⚪	`agents/channels/email#inboundEmail`	22.3 KiB	72.3 KiB
⚪	`agents/channels/slack#slack`	5.5 KiB	14.6 KiB
⚪	`agents/channels/slack#slackWebhook`	2.2 KiB	5.1 KiB
⚪	`agents/channels/tanstack-ai#createSendMessageTool`	16.2 KiB	68.4 KiB
⚪	`agents/channels/telegram#telegram`	3.8 KiB	10.3 KiB
⚪	`agents/channels/telegram#telegramWebhook`	1.6 KiB	3.6 KiB
⚪	`agents/channels/voice#browserVoice`	1010 B	2.2 KiB
⚪	`agents/chat#AbortRegistry`	2.5 KiB	8.9 KiB
⚪	`agents/chat#AGENT_TOOL_STREAM_PROGRESS_BUMP_THROTTLE_MS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#AgentToolProgressEmitter`	2.7 KiB	9.5 KiB
⚪	`agents/chat#AgentToolStreamProgressThrottle`	2.4 KiB	8.3 KiB
⚪	`agents/chat#aiSdkRecoveryCodec`	2.3 KiB	8.2 KiB
⚪	`agents/chat#applyAgentToolEvent`	3.2 KiB	11.0 KiB
⚪	`agents/chat#applyChunkToParts`	2.3 KiB	8.2 KiB
⚪	`agents/chat#applyToolUpdate`	2.4 KiB	8.4 KiB
⚪	`agents/chat#AutoContinuationController`	2.3 KiB	8.2 KiB
⚪	`agents/chat#awaitWithDeadline`	2.4 KiB	8.4 KiB
⚪	`agents/chat#broadcastTransition`	3.2 KiB	11.6 KiB
⚪	`agents/chat#buildChatRecoveringFrame`	2.4 KiB	8.4 KiB
⚪	`agents/chat#buildInClauseStrings`	2.4 KiB	8.4 KiB
⚪	`agents/chat#bumpChatRecoveryProgress`	2.4 KiB	8.3 KiB
⚪	`agents/chat#byteLength`	2.5 KiB	8.5 KiB
⚪	`agents/chat#CHAT_LAST_TERMINAL_KEY`	2.3 KiB	8.2 KiB
⚪	`agents/chat#CHAT_MESSAGE_TYPES`	2.3 KiB	8.2 KiB
⚪	`agents/chat#CHAT_RECOVERING_FLAG_TTL_MS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#CHAT_RECOVERING_KEY`	2.3 KiB	8.2 KiB
⚪	`agents/chat#CHAT_RECOVERY_ALARM_DEBOUNCE_MS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#CHAT_RECOVERY_INCIDENT_KEY_PREFIX`	2.3 KiB	8.2 KiB
⚪	`agents/chat#CHAT_RECOVERY_INCIDENT_TTL_MS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#CHAT_RECOVERY_PROGRESS_KEY`	2.3 KiB	8.2 KiB
⚪	`agents/chat#CHAT_RECOVERY_STABLE_RETRY_DELAY_SECONDS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#CHAT_RECOVERY_TASK_NAME`	2.3 KiB	8.2 KiB
⚪	`agents/chat#CHAT_STREAM_PROGRESS_CREDIT_THROTTLE_MS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#ChatRecoveryEngine`	4.5 KiB	15.5 KiB
⚪	`agents/chat#chatRecoveryTaskRunOptions`	2.4 KiB	8.6 KiB
⚪	`agents/chat#ChatStreamStalledError`	2.4 KiB	8.3 KiB
⚪	`agents/chat#classifyAgentToolChildRecovery`	2.4 KiB	8.5 KiB
⚪	`agents/chat#clearChatTerminal`	2.3 KiB	8.3 KiB
⚪	`agents/chat#clientResolvableToolNames`	2.3 KiB	8.3 KiB
⚪	`agents/chat#ContinuationState`	2.7 KiB	9.8 KiB
⚪	`agents/chat#createAgentToolEventState`	2.3 KiB	8.3 KiB
⚪	`agents/chat#createChatFiberSnapshot`	2.5 KiB	8.6 KiB
⚪	`agents/chat#createChatRecoveryTaskDefinition`	2.6 KiB	9.0 KiB
⚪	`agents/chat#createChatStreams`	6.4 KiB	22.1 KiB
⚪	`agents/chat#createChatTurnTaskDefinition`	2.7 KiB	8.9 KiB
⚪	`agents/chat#createToolsFromClientSchemas`	114.3 KiB	545.4 KiB
⚪	`agents/chat#crossMessageToolResultUpdate`	2.4 KiB	8.6 KiB
⚪	`agents/chat#DEFAULT_CHAT_RECOVERY_MAX_ATTEMPTS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#DEFAULT_CHAT_RECOVERY_MAX_OOM_RETRIES`	2.3 KiB	8.2 KiB
⚪	`agents/chat#DEFAULT_CHAT_RECOVERY_MAX_WORK`	2.3 KiB	8.2 KiB
⚪	`agents/chat#DEFAULT_CHAT_RECOVERY_NO_PROGRESS_TIMEOUT_MS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#DEFAULT_CHAT_RECOVERY_STABLE_TIMEOUT_MS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#DEFAULT_CHAT_RECOVERY_TERMINAL_MESSAGE`	2.4 KiB	8.3 KiB
⚪	`agents/chat#dispatchChatRecoveryToHandoff`	3.0 KiB	9.9 KiB
⚪	`agents/chat#drainInteractionApplies`	2.3 KiB	8.3 KiB
⚪	`agents/chat#enforceRowSizeLimit`	3.5 KiB	11.2 KiB
⚪	`agents/chat#hasIncompleteToolBatch`	2.4 KiB	8.6 KiB
⚪	`agents/chat#interceptAgentToolBroadcast`	2.5 KiB	8.7 KiB
⚪	`agents/chat#isPlatformFailure`	2.6 KiB	8.9 KiB
⚪	`agents/chat#isReplayChunk`	2.4 KiB	8.7 KiB
⚪	`agents/chat#iterateWithStallWatchdog`	2.6 KiB	8.8 KiB
⚪	`agents/chat#KV_DELETE_MAX_KEYS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#listActiveChatRecoveryIncidents`	2.4 KiB	8.4 KiB
⚪	`agents/chat#MAX_BOUND_PARAMS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#MessageType`	2.4 KiB	9.0 KiB
⚪	`agents/chat#normalizeToolInput`	2.3 KiB	8.2 KiB
⚪	`agents/chat#parseProtocolMessage`	2.5 KiB	9.0 KiB
⚪	`agents/chat#partAwaitsClientInteraction`	2.4 KiB	8.6 KiB
⚪	`agents/chat#pausedExecutionUpdate`	2.4 KiB	8.4 KiB
⚪	`agents/chat#pendingChatTerminal`	2.3 KiB	8.3 KiB
⚪	`agents/chat#persistReconstructedOrphan`	3.1 KiB	11.0 KiB
⚪	`agents/chat#PreStreamTurns`	2.6 KiB	9.3 KiB
⚪	`agents/chat#readChatRecoveryProgress`	2.3 KiB	8.3 KiB
⚪	`agents/chat#reconcileMessages`	2.8 KiB	9.6 KiB
⚪	`agents/chat#reconcileOrphanPartial`	2.4 KiB	8.5 KiB
⚪	`agents/chat#recordChatTerminal`	2.4 KiB	8.3 KiB
⚪	`agents/chat#repairInterruptedToolParts`	2.6 KiB	9.1 KiB
⚪	`agents/chat#resolveChatRecoveryConfig`	2.6 KiB	8.9 KiB
⚪	`agents/chat#resolveToolMergeId`	2.4 KiB	8.5 KiB
⚪	`agents/chat#ResumableStream`	5.2 KiB	17.3 KiB
⚪	`agents/chat#ResumeHandshake`	3.0 KiB	10.4 KiB
⚪	`agents/chat#ROW_MAX_BYTES`	2.3 KiB	8.2 KiB
⚪	`agents/chat#runChatRecoveryExhaustion`	2.6 KiB	8.9 KiB
⚪	`agents/chat#sanitizeMessage`	2.5 KiB	8.8 KiB
⚪	`agents/chat#sendIfOpen`	2.4 KiB	8.4 KiB
⚪	`agents/chat#setChatRecovering`	2.5 KiB	8.5 KiB
⚪	`agents/chat#shouldCreditStreamProgress`	2.4 KiB	8.3 KiB
⚪	`agents/chat#STREAM_RESUME_NONE_REASONS`	2.3 KiB	8.2 KiB
⚪	`agents/chat#StreamAccumulator`	2.9 KiB	10.7 KiB
⚪	`agents/chat#StreamProgressCreditThrottle`	2.4 KiB	8.3 KiB
⚪	`agents/chat#SubmitConcurrencyController`	2.9 KiB	10.3 KiB
⚪	`agents/chat#sweepStaleChatRecoveryIncidents`	2.4 KiB	8.5 KiB
⚪	`agents/chat#TextSegmentJoiner`	2.7 KiB	9.2 KiB
⚪	`agents/chat#TIMED_OUT`	2.3 KiB	8.2 KiB
⚪	`agents/chat#toolApprovalUpdate`	2.4 KiB	8.5 KiB
⚪	`agents/chat#toolPartHasSettledResult`	2.3 KiB	8.4 KiB
⚪	`agents/chat#toolResultUpdate`	2.4 KiB	8.5 KiB
⚪	`agents/chat#truncateOlderMessages`	3.2 KiB	10.5 KiB
⚪	`agents/chat#truncateOlderToolResults`	3.3 KiB	10.9 KiB
⚪	`agents/chat#TurnQueue`	2.6 KiB	9.2 KiB
⚪	`agents/chat#unwrapChatFiberSnapshot`	2.4 KiB	8.5 KiB
⚪	`agents/chat#wrapChatFiberSnapshot`	2.3 KiB	8.2 KiB
⚪	`agents/chat-sdk#ChatSdkStateAdapter`	263.5 KiB	1152.6 KiB
⚪	`agents/chat-sdk#ChatSdkStateAgent`	262.8 KiB	1150.0 KiB
⚪	`agents/chat-sdk#createChatSdkState`	263.5 KiB	1152.6 KiB
⚪	`agents/chat-sdk#defaultKeyShard`	261.2 KiB	1141.2 KiB
⚪	`agents/chat-sdk#defaultThreadShard`	261.1 KiB	1141.0 KiB
⚪	`agents/chat/react#detectToolsRequiringConfirmation`	3.3 KiB	8.3 KiB
⚪	`agents/chat/react#extractClientToolSchemas`	3.2 KiB	8.3 KiB
⚪	`agents/chat/react#getAgentMessages`	3.4 KiB	8.6 KiB
⚪	`agents/chat/react#getToolApproval`	3.1 KiB	8.0 KiB
⚪	`agents/chat/react#getToolCallId`	3.1 KiB	8.0 KiB
⚪	`agents/chat/react#getToolInput`	3.1 KiB	8.0 KiB
⚪	`agents/chat/react#getToolOutput`	3.1 KiB	8.0 KiB
⚪	`agents/chat/react#getToolPartState`	3.2 KiB	8.2 KiB
⚪	`agents/chat/react#useAgentChat`	133.5 KiB	611.6 KiB
⚪	`agents/chat/react#WebSocketChatTransport`	6.2 KiB	18.7 KiB
⚪	`agents/chat/transport#WebSocketChatTransport`	3.3 KiB	10.7 KiB
⚪	`agents/client#AgentClient`	21.8 KiB	75.2 KiB
⚪	`agents/client#AgentConnectionError`	16.3 KiB	57.8 KiB
⚪	`agents/client#agentFetch`	19.7 KiB	69.0 KiB
⚪	`agents/client#createStubProxy`	16.4 KiB	57.8 KiB
⚪	`agents/client#DEFAULT_CALL_TIMEOUT_MS`	16.2 KiB	57.6 KiB
⚪	`agents/client#isTerminalCloseEvent`	16.3 KiB	57.6 KiB
⚪	`agents/client#nativeCall`	16.5 KiB	58.3 KiB
⚪	`agents/client#NativeCallQueue`	16.7 KiB	58.9 KiB
⚪	`agents/client#splitCallOptions`	16.3 KiB	57.7 KiB
⚪	`agents/context#AgentContextProvider`	412 B	792 B
⚪	`agents/context#AgentSearchProvider`	640 B	1.3 KiB
⚪	`agents/context#ContextBlocks`	87.4 KiB	429.7 KiB
⚪	`agents/email#createAddressBasedEmailResolver`	193 B	227 B
⚪	`agents/email#createCatchAllEmailResolver`	110 B	97 B
⚪	`agents/email#createHeaderBasedEmailResolver`	334 B	492 B
⚪	`agents/email#createSecureReplyEmailResolver`	718 B	1.3 KiB
⚪	`agents/email#DEFAULT_MAX_AGE_SECONDS`	56 B	39 B
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⚪	`agents/mcp/client#getNamespacedData`	62.9 KiB	240.0 KiB
⚪	`agents/mcp/client#MCP_SERVER_ID_MAX_LENGTH`	62.9 KiB	239.9 KiB
⚪	`agents/mcp/client#MCPClientManager`	158.6 KiB	702.6 KiB
⚪	`agents/mcp/client#normalizeServerId`	63.0 KiB	240.2 KiB
⚪	`agents/mcp/do-oauth-client-provider#DurableObjectOAuthClientProvider`	2.1 KiB	6.6 KiB
⚪	`agents/mcp/server#createMcpHandler`	80.5 KiB	307.2 KiB
⚪	`agents/mcp/server#getMcpAuthContext`	64.0 KiB	245.5 KiB
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⚪	`agents/observability#genericObservability`	470 B	1.2 KiB
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⚪	`agents/observability/ai#wrapAISDK`	8.8 KiB	30.5 KiB
⚪	`agents/queue#Queue`	3.1 KiB	9.6 KiB
⚪	`agents/react#_testUtils`	19.3 KiB	66.4 KiB
⚪	`agents/react#useAgent`	27.1 KiB	89.9 KiB
⚪	`agents/react#useAgentToolEvents`	21.1 KiB	73.7 KiB
⚪	`agents/routing#getAgentByName`	795 B	1.7 KiB
⚪	`agents/routing#routeAgentRequest`	1.6 KiB	3.6 KiB
⚪	`agents/routing#RoutedAgents`	2.4 KiB	6.2 KiB
⚪	`agents/schedule#getSchedulePrompt`	85.8 KiB	424.7 KiB
⚪	`agents/schedule#scheduleSchema`	85.3 KiB	423.6 KiB
⚪	`agents/schedule#unstable_getSchedulePrompt`	85.9 KiB	424.9 KiB
⚪	`agents/schedule#unstable_scheduleSchema`	85.3 KiB	423.6 KiB
⚪	`agents/schedules#Scheduler`	6.8 KiB	22.0 KiB
⚪	`agents/schedules/parser#getSchedulePrompt`	85.8 KiB	424.7 KiB
⚪	`agents/schedules/parser#scheduleSchema`	85.3 KiB	423.6 KiB
⚪	`agents/sessions#COMPACTION_PREFIX`	147 B	160 B
⚪	`agents/sessions#createCompactFunction`	1.7 KiB	4.0 KiB
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⚪	`agents/sessions#Session`	2.0 KiB	6.3 KiB
⚪	`agents/sessions#Sessions`	9.6 KiB	34.3 KiB
⚪	`agents/skills#fromManifest`	309.8 KiB	1084.0 KiB
⚪	`agents/skills#parseSkillFrontmatter`	328.4 KiB	1146.2 KiB
⚪	`agents/skills#parseSkillMarkdown`	328.6 KiB	1146.5 KiB
⚪	`agents/skills#r2`	330.2 KiB	1150.4 KiB
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⚪	`agents/skills#SkillRegistry`	416.4 KiB	1581.7 KiB
⚪	`agents/skills/compile#compileSkillScript`	15.4 KiB	43.4 KiB
⚪	`agents/skills/compile#isCompilableSkillScript`	15.4 KiB	43.3 KiB
⚪	`agents/state#State`	1.1 KiB	2.4 KiB
⚪	`agents/streams#DEFAULT_MAX_CHUNK_BYTES`	94 B	96 B
⚪	`agents/streams#sseResponse`	857 B	1.6 KiB
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⚪	`agents/types#MessageType`	211 B	365 B
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⚪	`agents/voice/sfu#addSFUTracks`	323 B	424 B
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⚪	`agents/voice/text#iterateText`	1.6 KiB	3.8 KiB
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⚪	`agents/voice/types#VOICE_PROTOCOL_VERSION`	51 B	31 B
⚪	`agents/voice/workers-ai#WorkersAIFluxSTT`	1.5 KiB	4.3 KiB
⚪	`agents/voice/workers-ai#WorkersAINova3STT`	1.6 KiB	4.3 KiB
⚪	`agents/voice/workers-ai#WorkersAITTS`	682 B	1.4 KiB
⚪	`agents/websockets#CAPNWEB_TRANSPORT_QUERY`	12.4 KiB	43.3 KiB
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⚪	`agents/websockets#capnWebTransportUrl`	12.5 KiB	43.5 KiB
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⚪	`agents/websockets#CF_READONLY_KEY`	12.4 KiB	43.3 KiB
⚪	`agents/websockets#isCapnWebTransportUpgrade`	12.5 KiB	43.4 KiB
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⚪	`agents/workflows#AgentWorkflow`	262.4 KiB	1145.7 KiB
⚪	`agents/workflows#WorkflowRejectedError`	261.2 KiB	1141.2 KiB
⚪	`agents/x402#normalizeNetwork`	14.7 KiB	61.1 KiB
⚪	`agents/x402#withX402`	23.0 KiB	89.2 KiB
⚪	`agents/x402#withX402Client`	104.1 KiB	346.5 KiB

Reported by agent-think[bot].

pkg-pr-new · 2026-09-18T10:16:57Z

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agents

npm i https://pkg.pr.new/agents@2302

@cloudflare/ai-chat

npm i https://pkg.pr.new/@cloudflare/ai-chat@2302

@cloudflare/codemode

npm i https://pkg.pr.new/@cloudflare/codemode@2302

hono-agents

npm i https://pkg.pr.new/hono-agents@2302

@cloudflare/shell

npm i https://pkg.pr.new/@cloudflare/shell@2302

@cloudflare/think

npm i https://pkg.pr.new/@cloudflare/think@2302

@cloudflare/voice

npm i https://pkg.pr.new/@cloudflare/voice@2302

@cloudflare/worker-bundler

npm i https://pkg.pr.new/@cloudflare/worker-bundler@2302

commit: ff32623

aron-cf · 2026-09-21T13:22:51Z

    keepAliveMs?: number;
    includeTargets?: boolean;
    recording?: boolean;
+    guardrails?: BrowserSessionGuardrails;


If nothing is passed, is everything allowed or nothing?

Follows the default Browser Run behaviour of allowing all if nothing is passed.

aron-cf

I think a usage example would help in the PR description. My understanding of this is it means that we can recover an existing browser session across executions?

aron-cf · 2026-09-21T13:27:20Z

+
+/** The store key for a named browser session. */
+export function namedBrowserSessionKey(name: string): string {
+  return `${NAMED_SESSION_KEY_PREFIX}${name}`;


Does name need to be validated somewhere?

It's set in the host code, and only used in the session store so never reaches anything dangerous. I think the only limit it could break is the DO storage key max size which is massive and would break loudly.

we could iterate on this later if/when we start letting models or users influence names - that's when we might want to validate a more sensible length cap or check chars are printable etc.

aron-cf · 2026-09-21T13:31:26Z

+   * (and before it prunes a tombstone). Defaults to
+   * {@link DEFAULT_SWEEP_IDLE_MS} (10 minutes).
+   */
+  sweepIdleMs?: number;


This is weird that this exists here because the session doesn't actually handle the timeout, it's just here as metadata for the sweep method. I think it'd be cleaner to pass it into sweep(since: number) in the lifecycle capability.

I actually moved both sweepIdleMs and touchIntervalMs to be a property of the session itself to fix a bug that occurred when the touchIntervalMs < sweepIdleMs.

This diagram hopefully explains it better than i can in words, but in essence, we have to keep track of when we last used the CDP connection between the agent and the browser, but we also need to throttle how often we write that message to the store (using touchIntervalMs). That throttle means if the sweep happens more often than the touchIntervalMs, the CDP connection could be in active use, but the browser will still get swept up if touchIntervalMs < sweepIdleMs

flowchart LR subgraph W["WRITER: every open connection (connect())"] A[CDP message sent or received] --> B{last touch older than touchIntervalMs?} B -- no --> X[skip] B -- yes --> C[touch: updatedAt = now] end C --> S[("store browser:session:checkout updatedAt")] subgraph R["READER: sweep() on the Lifecycle alarm"] D{now − updatedAt ≥ sweepIdleMs?} -- yes --> E[close browser + tombstone] D -- no --> F[leave it] end S --> D

Loading

aron-cf · 2026-09-21T13:35:27Z

+  /**
+   * Minimum interval between activity-driven `updatedAt` refreshes on
+   * connected sockets. Defaults to {@link SESSION_TOUCH_INTERVAL_MS} and is
+   * always capped at half of `sweepIdleMs`, so continuous CDP traffic
+   * refreshes the idle clock before a sweep deadline can pass. Overridable
+   * primarily for tests.
+   */
+  touchIntervalMs?: number;


I'm not sure I understand this one either, it looks like it exists to throttle the touch calls in the onActivity handler, but I don't follow how it connects to the sleep.

#2302 (comment)

ben-reitz · 2026-09-21T16:03:45Z

I think a usage example would help in the PR description. My understanding of this is it means that we can recover an existing browser session across executions?

Yep that's right. I've updated the PR description to try and make it clearer.

Review question on #2302: omitting guardrails entirely follows the documented Browser Run default — all hostnames are allowed. Say so on the type instead of making every reader ask.

…ssion Review question on #2302 asked whether the conditional body existed because the acquire endpoint rejects an empty body. Verified against the live endpoint: acquire returns 200 for no body, an empty {} JSON body, and a guardrails body alike. With the concern disproven, drop the conditional and send one uniform request shape.

Five positional parameters with two trailing optional callbacks made construction sites unreadable (review feedback on #2302). The socket stays positional; timeoutMs, onClose, sessionId, and onActivity move into a named CdpSessionOptions object.

Review feedback on #2302: Chromium-only options paired with browser: "kitesurf" were only caught at runtime. ConnectBrowserOptions and OneShotBrowserSessionOptions are now engine-discriminated unions — selecting Kitesurf removes keepAliveMs/includeTargets/recording (and guardrails for one-shots) at the type level, with browser: "chromium" accepted explicitly on the default arm. Runtime guards remain for plain-JS callers, consolidated into one check with one message per entry point. New tests-d file pins the compile-time rejections; runtime smuggle tests use casts to keep exercising the guards.

devin-ai-integration

Devin Review found 1 new potential issue.

devin-ai-integration · 2026-09-23T21:14:30Z

connectBrowserSession

+    const cdp = await connectBrowserSession(this.#browser, resolved.sessionId, {
+      timeoutMs: this.#timeoutMs,
+      onActivity: () => {


🟡 Expiry race aborts named connection

When the browser expires after resolve, connect attaches to its stale ID and rejects instead of replacing it. Separate liveness and upgrade requests leave this expiration window.

Learn more

resolve() proves liveness with a /json/list request, then connect() performs a separate WebSocket upgrade. Browser Run can expire or reclaim the session between those requests. connectBrowserSession makes one upgrade attempt and turns a response without a WebSocket into an error, so this path never reaches the dead-session replacement logic.

Example: The liveness request for session-7 succeeds at the end of its keep-alive window. Browser Run expires it before the upgrade arrives. connect("checkout") rejects instead of returning a new session with restarted: true.

Recommended fix: Make attachment failure identify 404/410 responses, then atomically tombstone the matching stored session and retry resolution and attachment. Bound retries and avoid replacing an entry that another caller already swapped.

Was this helpful? React with 👍 or 👎 to provide feedback.

Provider-independent named sessions over the existing store contract: - NamedBrowserSessions.resolve() is reattach-or-create keyed by browser:session:<name> — hosts wire names, models never see session identity. restarted: true signals loudly whenever a prior browser was lost (died upstream, closed, or swept); first-ever use is not a restart. - Durable creation options (keepAliveMs, recording, guardrails.allowedDomains/allowedDomainSets) are reapplied on every create so they survive the restart path. keep_alive pins to the 600-second platform max by default. - createBrowserSession() gains guardrails support — they ride the acquire POST body per the Browser Run REST contract; Kitesurf rejects them. - close() tombstones and deletes; sweep() closes idle sessions, leaves tombstones, and prunes aged ones (creator-overridable 10-minute TTL, alarm scheduling lands with the Lifecycle capability slice). - openOneShotBrowserSession() is the trivial create-and-close branch: no store, platform session deleted when the CDP socket closes. connectBrowserSession() gains an optional onClose to support it. Lock discipline mirrors BrowserConnector: locks wrap storage only, probes and Browser Run calls run outside, commits re-check for concurrent swaps (covered by tests, including a lock-across-network violation detector). Internal module — no public export changes until the starter-pack slice. Existing browser_execute behavior untouched.

Review question on #2302: omitting guardrails entirely follows the documented Browser Run default — all hostnames are allowed. Say so on the type instead of making every reader ask.

…ssion Review question on #2302 asked whether the conditional body existed because the acquire endpoint rejects an empty body. Verified against the live endpoint: acquire returns 200 for no body, an empty {} JSON body, and a guardrails body alike. With the concern disproven, drop the conditional and send one uniform request shape.

Five positional parameters with two trailing optional callbacks made construction sites unreadable (review feedback on #2302). The socket stays positional; timeoutMs, onClose, sessionId, and onActivity move into a named CdpSessionOptions object.

Review feedback on #2302: Chromium-only options paired with browser: "kitesurf" were only caught at runtime. ConnectBrowserOptions and OneShotBrowserSessionOptions are now engine-discriminated unions — selecting Kitesurf removes keepAliveMs/includeTargets/recording (and guardrails for one-shots) at the type level, with browser: "chromium" accepted explicitly on the default arm. Runtime guards remain for plain-JS callers, consolidated into one check with one message per entry point. New tests-d file pins the compile-time rejections; runtime smuggle tests use casts to keep exercising the guards.

CDP activity refreshed the idle clock only through a throttled, asynchronous store touch. A sweep that won the key lock first still saw the stale updatedAt and deleted the browser under a command that had already been sent. Record each send in memory synchronously and have the sweep's locked recheck consult it, so any command sent before that recheck keeps its browser.

…stone Pruning an aged-out tombstone removed the only record that a name had ever owned a browser, so the next resolve reported restarted: false and the caller was never told its state was gone — the common return-after-a-pause case. Move pruned tombstones to a browser:retired:<name> marker outside the swept keyspace (so the Lifecycle sweep job still retires) and treat it as restart evidence on the create path.

A superseded socket that kept sending after its session was closed, swept, or replaced re-recorded activity for a dead session id with no cleanup path. Each sweep now drops activity for ids the store no longer holds live. Also document that activity tracking is per instance: use one NamedBrowserSessions per store.

…ed overload Plain-JavaScript and prebuilt callers of new CdpSession(ws, timeoutMs, dispose, sessionId) would otherwise silently fall back to the 10s default and drop the close callback and session id. Normalize either form at runtime; the options object stays the preferred API.

ben-reitz added this pull request to stack #2303 September 18, 2026 10:04

ben-reitz marked this pull request as ready for review September 18, 2026 10:05

ben-reitz mentioned this pull request Sep 18, 2026

feat(agents): add the named browser session core #2292

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ben-reitz force-pushed the feat/browser-session-core branch 4 times, most recently from 5b4dad0 to 438e007 Compare September 19, 2026 16:36

aron-cf reviewed Sep 21, 2026

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ben-reitz force-pushed the feat/browser-session-core branch from 6c81bde to 3186292 Compare September 23, 2026 19:08

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docs(agents): record the browser session design and API additions #2294

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ben-reitz force-pushed the feat/browser-session-core branch 2 times, most recently from b5b8657 to fd42849 Compare September 24, 2026 09:07

This was referenced Sep 24, 2026

refactor(agents): let Browser Run keep_alive reclaim idle named sessions #2358

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feat(agents): add the browser-sessions Lifecycle capability #2293

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ben-reitz added 3 commits September 24, 2026 14:22

docs(agents): state the default when browser guardrails are omitted

ef2ae33

Review question on #2302: omitting guardrails entirely follows the documented Browser Run default — all hostnames are allowed. Say so on the type instead of making every reader ask.

ben-reitz added 6 commits September 24, 2026 14:22

ben-reitz force-pushed the feat/browser-session-core branch from fd42849 to ff32623 Compare September 24, 2026 13:22

ben-reitz merged commit 3f6bdad into main Sep 24, 2026
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ben-reitz deleted the feat/browser-session-core branch September 24, 2026 14:59

ben-reitz mentioned this pull request Sep 25, 2026

fix(agents): retry connect() when the browser expires mid-connect #2368

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