# agents@0.28.0

Category: agent-infrastructure
Published: 2026-10-09T14:05:30Z
Source: [Cloudflare Agents SDK releases](https://github.com/cloudflare/agents/releases/tag/agents%400.28.0)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-09T16:17:33.053Z
Tags: cloudflare, agents-sdk, edge-runtime

## Human Summary
Cloudflare Agents SDK 0.28.0 adds persistent browser and document web fetch tools, stabilizes lifecycle and core capabilities, and updates ThinkHarness session storage.

## Agent Summary
Cloudflare Agents SDK v0.28.0 introduces browser tools across pi, ai-sdk, and tanstack-ai integrations, adds an agents/webfetch tool for converting web formats to Markdown/JSON/text, stabilizes agents/lifecycle alongside Scheduler, State, WebSockets, and MCPClientManager, and migrates ThinkHarness sessions to agents/harness/store.

## Body
Cloudflare has released agents@0.28.0 featuring significant tool additions and stability updates: - Persistent Browser Tool: Added across agents/browser/{pi,ai-sdk,tanstack-ai} (including browserTool() in agents/browser/pi ) enabling agents to manipulate persistent browser sessions. - Web Fetch Tool: Introduced in agents/webfetch/{pi,ai-sdk,tanstack-ai} to read URLs as Markdown, JSON, or text, supporting HTML, PDF, and Office documents via Worker AI. - Lifecycle Stability: Marked agents/lifecycle as stable, together with Scheduler ( agents/schedules ), State ( agents/state ), WebSockets ( agents/websockets ), and MCPClientManager ( agents/mcp/client ). - ThinkHarness Storage: ThinkHarness now stores sessions and operations in the shared agents/harness/store , executing automatic migrations on the first run.

## Recommended actions
- Update project dependency to agents@0.28.0 .
- Adopt agents/browser/ or agents/webfetch/ if persistent browser automation or document-to-markdown fetching is required.
- Review usage of agents/lifecycle , agents/schedules , agents/state , agents/websockets , and agents/mcp/client against newly stabilized APIs.
- Be aware that running ThinkHarness after upgrading will execute initial migrations to store sessions in agents/harness/store .

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.