Week 37 · September 7–11, 2026 changedwhats-new/2026-w37
Nearest release: v2.1.282, published 7 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 24 Sep 2026 23:46 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 20 Oct 2026 18:37 UTC.
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33> Test your plugins with claude plugin eval and pop Claude Code Desktop panes out into their own windows.
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5<div className="digest-meta">
6 <span>Releases <a href="/docs/en/changelog#2-1-263">v2.1.263 → v2.1.269</a></span>
7 <span>2 features · September 7–11</span>
8</div>
5Releases [v2.1.263 → v2.1.269](/docs/en/changelog#2-1-263)
62 features · September 7–11
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10<div className="digest-feature">
11 <div className="digest-feature-header">
12 <span className="digest-feature-title">Test plugins with claude plugin eval</span>
13 <span className="digest-feature-pill">v2.1.269</span>
14 </div>
8Test plugins with claude plugin eval
9v2.1.269
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16 <p className="digest-feature-lede"><code>claude plugin eval</code> runs your plugin against a suite of test cases, scores the results, and by default runs each case again without the plugin so you can see what it contributes. <code>claude plugin eval init</code> asks you what a good result looks like, then proposes test cases and the checks that score them, tries the suite once, and writes the files. Every run, and every check that has a second model judge the reply, is a real model call on your account.</p>
11`claude plugin eval` runs your plugin against a suite of test cases, scores the results, and by default runs each case again without the plugin so you can see what it contributes. `claude plugin eval init` asks you what a good result looks like, then proposes test cases and the checks that score them, tries the suite once, and writes the files. Every run, and every check that has a second model judge the reply, is a real model call on your account.
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18 <Frame>
19 <img className="w-full" src="https://mintcdn.com/claude-code/f9HTZGyMtxIFOUgt/images/whats-new/plugin-eval.jpg?fit=max&auto=format&n=f9HTZGyMtxIFOUgt&q=85&s=913066f6d4a2a15426e98a627802f47f" alt="Terminal output of claude plugin eval: a table of seven cases with each case's score with and without the plugin, the delta between them, the run count, and the cost, followed by a summary line with the mean delta, total duration, and total cost" width="1600" height="900" data-path="images/whats-new/plugin-eval.jpg" />
20 </Frame>
13
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22 <p className="digest-feature-try">From your plugin's root directory, have Claude draft the suite:</p>
15From your plugin's root directory, have Claude draft the suite:
2316
24 ```bash terminal theme={null}
25 claude plugin eval init
26 ```
17```bash terminal theme={null}
18claude plugin eval init
19```
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28 <p className="digest-feature-try">When Claude tells you the suite is ready, exit the session that <code>claude plugin eval init</code> opened and run <code>claude plugin eval .</code> to score every case. The summary table prints in your terminal, and <code>report.html</code> under <code>evals/results/</code> has the per-run detail.</p>
21When Claude tells you the suite is ready, exit the session that `claude plugin eval init` opened and run `claude plugin eval .` to score every case. The summary table prints in your terminal, and `report.html` under `evals/results/` has the per-run detail.
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30 <a className="digest-feature-link" href="/docs/en/plugin-evals">Test plugins with evals</a>
31</div>
23[Test plugins with evals](/docs/en/plugin-evals)
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33<div className="digest-feature">
34 <div className="digest-feature-header">
35 <span className="digest-feature-title">Pop Desktop panes out into their own windows</span>
36 <span className="digest-feature-pill">Desktop</span>
37 </div>
25Pop Desktop panes out into their own windows
26Desktop
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39 <p className="digest-feature-lede">In the Claude Code Desktop app, you can pop any pane out into its own window. Drag the diff or terminal to a second screen while Claude keeps working in the main window, then dock the pane back when you're done.</p>
28In the Claude Code Desktop app, you can pop any pane out into its own window. Drag the diff or terminal to a second screen while Claude keeps working in the main window, then dock the pane back when you're done.
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41 <Frame>
42 <video autoPlay muted loop playsInline className="w-full" src="https://mintcdn.com/claude-code/f9HTZGyMtxIFOUgt/images/whats-new/desktop-pop-out-panes.mp4?fit=max&auto=format&n=f9HTZGyMtxIFOUgt&q=85&s=ff3770dd09bb15ed9cf17a460f3d1e23" data-path="images/whats-new/desktop-pop-out-panes.mp4" />
43 </Frame>
30<video autoPlay muted loop playsInline src="https://mintcdn.com/claude-code/f9HTZGyMtxIFOUgt/images/whats-new/desktop-pop-out-panes.mp4?fit=max&auto=format&n=f9HTZGyMtxIFOUgt&q=85&s=ff3770dd09bb15ed9cf17a460f3d1e23" />
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45 <a className="digest-feature-link" href="/docs/en/desktop#arrange-your-workspace">Arrange your workspace</a>
46</div>
32[Arrange your workspace](/docs/en/desktop#arrange-your-workspace)
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48<div className="digest-wins">
49 <p className="digest-wins-title">Other wins</p>
34Other wins
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51 <div className="digest-wins-grid">
52 <div>Set <a href="/docs/en/settings-reference#maxeffortlevel"><code>maxEffortLevel</code></a> at the top level or per model under <code>modelSettings</code> to cap the effort level on every provider, including Amazon Bedrock, Google Cloud's Agent Platform, and Microsoft Foundry; any higher level runs at the cap</div>
53 <div>Point `--plugin-dir` at a folder of plugins to <a href="/docs/en/plugins/create#load-a-directory-or-archive-for-one-session">load each immediate subfolder that has a manifest</a></div>
54 <div>If WebFetch hasn't finished downloading a page within five minutes, <a href="/docs/en/tools-reference#webfetch-tool-behavior">the fetch fails with a deadline error</a> instead of hanging; set <code>CLAUDE\_CODE\_WEBFETCH\_DEADLINE\_MS</code> to change the deadline, or to <code>0</code> to remove the limit</div>
55 <div>Pass `--json` to <code>claude plugin install</code>, <code>uninstall</code>, <code>update</code>, <code>enable</code>, or <code>disable</code> to print the result as <a href="/docs/en/plugins/cli-reference#plugin-json-result">one JSON object on the last line of stdout</a></div>
56 <div>When the auto mode classifier blocks an action, the reason Claude receives <a href="/docs/en/auto-mode-config#fix-a-denial-with-an-allow-rule-an-environment-entry-or-a-retry">usually names the rule that matched</a>, such as <code>\[Data Exfiltration]</code></div>
57 <div>When you type <code>/</code> partway through a prompt, you can now pick from <a href="/docs/en/interactive-mode#complete-a-command-mid-prompt">a list of matching commands</a> instead of a single suggestion. The list opens as you type in fullscreen rendering. A plugin skill also matches on its name without the plugin prefix</div>
58 <div>In the VS Code extension, click the agent count at the bottom of the prompt box to open the <a href="/docs/en/vs-code#use-the-prompt-box">agent map</a>, where you can open a subagent's read-only transcript or stop it</div>
59 <div>In the VS Code extension, select <strong>Hooks</strong> or <strong>Permissions</strong> in the command menu's Customize section to <a href="/docs/en/vs-code#use-the-prompt-box">add or remove hooks and permission rules</a> in your user, project, and local settings</div>
60 <div>Claude can pick a <a href="/docs/en/artifacts#create-an-artifact">browser-tab icon</a> to match each artifact it publishes</div>
61 <div>In Claude Code on the web, take back a queued message in a cloud session before Claude reads it: remove it from the queue, or press <code>Esc</code> or <code>Up</code>, and the text returns to the message box</div>
62 </div>
63</div>
36Set [`maxEffortLevel`](/docs/en/settings-reference#maxeffortlevel) at the top level or per model under `modelSettings` to cap the effort level on every provider, including Amazon Bedrock, Google Cloud's Agent Platform, and Microsoft Foundry; any higher level runs at the capPoint `--plugin-dir` at a folder of plugins to [load each immediate subfolder that has a manifest](/docs/en/plugins/create#load-a-directory-or-archive-for-one-session)If WebFetch hasn't finished downloading a page within five minutes, [the fetch fails with a deadline error](/docs/en/tools-reference#webfetch-tool-behavior) instead of hanging; set `CLAUDE_CODE_WEBFETCH_DEADLINE_MS` to change the deadline, or to `0` to remove the limitPass `--json` to `claude plugin install`, `uninstall`, `update`, `enable`, or `disable` to print the result as [one JSON object on the last line of stdout](/docs/en/plugins/cli-reference#plugin-json-result)When the auto mode classifier blocks an action, the reason Claude receives [usually names the rule that matched](/docs/en/auto-mode-config#fix-a-denial-with-an-allow-rule-an-environment-entry-or-a-retry), such as `[Data Exfiltration]`When you type `/` partway through a prompt, you can now pick from [a list of matching commands](/docs/en/interactive-mode#complete-a-command-mid-prompt) instead of a single suggestion. The list opens as you type in fullscreen rendering. A plugin skill also matches on its name without the plugin prefixIn the VS Code extension, click the agent count at the bottom of the prompt box to open the [agent map](/docs/en/vs-code#use-the-prompt-box), where you can open a subagent's read-only transcript or stop itIn the VS Code extension, select **Hooks** or **Permissions** in the command menu's Customize section to [add or remove hooks and permission rules](/docs/en/vs-code#use-the-prompt-box) in your user, project, and local settingsClaude can pick a [browser-tab icon](/docs/en/artifacts#create-an-artifact) to match each artifact it publishesIn Claude Code on the web, take back a queued message in a cloud session before Claude reads it: remove it from the queue, or press `Esc` or `Up`, and the text returns to the message box
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6538[Full changelog for v2.1.263–v2.1.269 →](/docs/en/changelog#2-1-263)
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