Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
One change · api

Create a Message changed

api/beta/messages/create

Nearest release: v2.1.280, published 20 hours after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Recorded here
Lines+6added
Lines−2removed
From line 121 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits13to this page, all time

The whole hunk

from line 121, old and new numbered
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lines
from line 121
121121 
122122- `"anthropic-workspace-id": optional string`
123123 
124 Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`).
125 
126 Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace.
127 
124128## Body parameters
125129 
126130- `max_tokens: number`
from line 5184
51805184 
51815185 - `diagnostics: BetaDiagnostics or null`
51825186 
5183 Response envelope for request-level diagnostics. Present (possibly
5184 null) whenever the caller supplied `diagnostics` on the request.
5187 Request-level diagnostics: why the prompt cache could not fully reuse
5188 the prefix of the request named by `diagnostics.previous_message_id`.
51855189 
51865190 - `cache_miss_reason: BetaCacheMissModelChanged or BetaCacheMissSystemChanged or BetaCacheMissToolsChanged or 3 more or null`
51875191