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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.251 Feeds RSS JSON llms.txt
Reading a new release v2.1.251 Analysing changes · 2/5 Deeper second pass · 0/5 agents 427 findings $12.75 so far

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

One change

Update Environment

api/beta/environments/update

first seen The page's own history The capture it came from

Nearest release: v2.1.247, published under an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

api/beta/environments/update Changed · +18 / -2 lines

from line 16
 
   - `string`
 
-  - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 31 more`
+  - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 38 more`
 
     - `"message-batches-2024-09-24"`
from line 86
 
     - `"mid-conversation-tool-changes-2026-07-01"`
 
+    - `"compact-2026-01-12"`
+
+    - `"computer-use-2025-11-24"`
+
+    - `"mcp-tunnels-2026-06-22"`
+
+    - `"structured-outputs-2025-11-13"`
+
+    - `"task-budgets-2026-03-13"`
+
+    - `"thinking-display-updates-2026-08-18"`
+
+    - `"ce-user-management-2026-07-13"`
+
 ## Body parameters
 
 - `config: optional BetaCloudConfigParams or BetaSelfHostedConfigParams or null`
from line 146
 
         - `allow_package_managers: optional boolean or null`
 
-          Permits outbound access to public package registries (PyPI, npm, etc.) beyond those listed in the `allowed_hosts` array. Defaults to `false`.
+          Permits outbound access to public package registries (PyPI, npm, etc.) beyond those listed in the `allowed_hosts` array. Defaults to `false` on creation. Must be `true` when `packages` are specified.
 
         - `allowed_hosts: optional array of string or null`
from line 157
       Specify packages (and optionally their versions) available in this environment.
 
       When versioning, use the version semantics relevant for the package manager, e.g. for `pip` use `package==1.0.0`. You are responsible for validating the package and version exist. Unversioned installs the latest.
+
+      Under `limited` networking, requires `networking.allow_package_managers` to be `true`.
 
       - `apt: optional array of string or null`