[mattzcarey]

createBrowserTool now runs the model's code in a fresh Dynamic Worker from the loader you pass, with no network access and a cdp object backed by the new browser.session(). It no longer runs on @cloudflare/codemode, so it needs neither ctx nor a CodemodeRuntime export.

const session = this.browser.session({ scope });
await session.send({ method: "Page.navigate", params: { url }, sessionId: "active" });
const report = await session.close(); // { restarted, newTabs, tabClosed, tabShared }

Stacked on #2610, as part of deprecating codemode (#2609):

• BrowserSession holds the CDP logic that used to live in BrowserSessionConnector: the "active" tab, attach handles, error hints and the report. @cloudflare/computer's ws:browser (computer: Add a ws:browser host module computer#248) uses it through name and session() instead of its own copy, so neither package imports the other
• the code is loaded as an expression and, if that doesn't parse, as a function body, which replaces codemode's acorn normalizer for this tool
• deprecated pieces stay where they are and don't change: BrowserConnector, its option types and CodemodeRuntime are still exported from agents/browser (now marked deprecated), so agents/browser still imports codemode until they're removed

pnpm run check, the agents workers suite, the pi harness suite and the real-Chrome suite (test:browser) ran. browser-session.test.ts ports the connector's tests, and new tests cover the code shapes, parse errors, thrown errors, logs, timeouts and blocked fetch.

[changeset-bot]

🦋 Changeset detected

Latest commit: 4e1e7cc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
agents	Minor
@cloudflare/agent-think	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[agent-think]

🔴 agents import sizes: 1 entry point over threshold

	Entry point	Exports	Largest gzip change	Size now
🔴	agents/browser	1 resized, 2 new	+6.5 KiB (+15.69%)	47.8 KiB
🟡	agents/browser/ai	2 resized	+1.4 KiB (+0.97%)	148.9 KiB
🟢	agents/browser/pi	2 resized	-43.2 KiB (-55.96%)	34 KiB
🟢	agents/browser/ai-sdk	2 resized	up to -9 KiB (-6.3%)	133.4 KiB
🟢	agents/browser/tanstack-ai	2 resized	-9 KiB (-5.67%)	149 KiB

Changed exports (11)

	Import	Gzip change	Size now
🔴	agents/browser#Browser	+6.5 KiB (+15.69%)	47.8 KiB
🟡	agents/browser/ai#createBrowserRuntime	+1.4 KiB (+0.97%)	148.9 KiB
🟡	agents/browser/ai#createBrowserTools	+1.4 KiB (+0.97%)	148.9 KiB
🆕	agents/browser#BrowserSession	—	42.8 KiB
🆕	agents/browser#ACTIVE_PAGE_SESSION	—	36 KiB
🟢	agents/browser/pi#createBrowserTool	-43.2 KiB (-55.96%)	34 KiB
🟢	agents/browser/pi#browserTool	-43.2 KiB (-55.96%)	34 KiB
🟢	agents/browser/ai-sdk#browserTool	-9 KiB (-6.3%)	133.4 KiB
🟢	agents/browser/ai-sdk#createBrowserTool	-9 KiB (-6.3%)	133.4 KiB
🟢	agents/browser/tanstack-ai#createBrowserTool	-9 KiB (-5.67%)	149 KiB
🟢	agents/browser/tanstack-ai#browserTool	-9 KiB (-5.67%)	149 KiB

How this works

Each runtime export is bundled on its own, minified, and gzipped. Changes smaller than 100 B, or smaller than 1% and 1 KiB, are ignored. Growth over 10% or 5 KiB is marked 🔴. This report is informational and does not fail CI. The workflow artifact contains every measurement.

_{Compared c84dc2c4 → 4e1e7ccc · workflow run · reported by agent-think[bot]}

[pkg-pr-new]

Open in StackBlitz

agents

npm i https://pkg.pr.new/agents@2612

@cloudflare/ai-chat

npm i https://pkg.pr.new/@cloudflare/ai-chat@2612

@cloudflare/codemode

npm i https://pkg.pr.new/@cloudflare/codemode@2612

hono-agents

npm i https://pkg.pr.new/hono-agents@2612

@cloudflare/shell

npm i https://pkg.pr.new/@cloudflare/shell@2612

@cloudflare/think

npm i https://pkg.pr.new/@cloudflare/think@2612

@cloudflare/voice

npm i https://pkg.pr.new/@cloudflare/voice@2612

@cloudflare/worker-bundler

npm i https://pkg.pr.new/@cloudflare/worker-bundler@2612

commit: 4e1e7cc

[ben-reitz]

All done in #2667