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Sweep 28 Aug 2026 ยท 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

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

Threads

api/beta/sessions/threads

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/sessions/threads Changed · +79 / -9 lines

This page is larger than the 256 KiB this site keeps, so one side of the diff below stops where the stored text does.

from line 30
 
   - `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 100
 
     - `"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"`
+
 ### Returns
 
 - `data: optional array of BetaManagedAgentsSessionThread`
from line 126
 
   - `agent: BetaManagedAgentsSessionThreadAgent or BetaManagedAgentsAdvisor`
 
-    A session-resolved multiagent roster entry.
+    The resolved agent a session thread runs: a saved-agent snapshot, the platform advisor entry, or an inline-defined (ephemeral) agent snapshot.
 
     - `BetaManagedAgentsSessionThreadAgent object`
from line 873
 
   - `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 943
 
     - `"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"`
+
 ### Returns
 
 - `BetaManagedAgentsSessionThread object`
from line 969
 
   - `agent: BetaManagedAgentsSessionThreadAgent or BetaManagedAgentsAdvisor`
 
-    A session-resolved multiagent roster entry.
+    The resolved agent a session thread runs: a saved-agent snapshot, the platform advisor entry, or an inline-defined (ephemeral) agent snapshot.
 
     - `BetaManagedAgentsSessionThreadAgent object`
from line 1707
 
   - `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 1777
 
     - `"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"`
+
 ### Returns
 
 - `BetaManagedAgentsSessionThread object`
from line 1803
 
   - `agent: BetaManagedAgentsSessionThreadAgent or BetaManagedAgentsAdvisor`
 
-    A session-resolved multiagent roster entry.
+    The resolved agent a session thread runs: a saved-agent snapshot, the platform advisor entry, or an inline-defined (ephemeral) agent snapshot.
 
     - `BetaManagedAgentsSessionThreadAgent object`
from line 2536
 
   - `agent: BetaManagedAgentsSessionThreadAgent or BetaManagedAgentsAdvisor`
 
-    A session-resolved multiagent roster entry.
+    The resolved agent a session thread runs: a saved-agent snapshot, the platform advisor entry, or an inline-defined (ephemeral) agent snapshot.
 
     - `BetaManagedAgentsSessionThreadAgent object`
from line 5482
 
   - `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 5552
 
     - `"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"`
+
 #### Returns
 
 - `data: optional array of BetaManagedAgentsSessionEvent`
from line 7758
 
   - `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 7828
 
     - `"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"`
+
 #### Returns
 
 - `BetaManagedAgentsStreamSessionThreadEvents = BetaManagedAgentsUserMessageEvent or BetaManagedAgentsUserInterruptEvent or BetaManagedAgentsUserToolConfirmationEvent or 34 more`
from line 9274
 
   - `BetaManagedAgentsSessionUpdatedEvent object`
 
-    Emitted when an UpdateSession request changed at least one field. Carries only the fields that changed; absent fields were not part of the update. The new configuration applies from the next turn.
-
-    - `id: string`
-
-      Unique identifier for this event.
-
-    - `processed_at: string`
-
-      A timestamp in RFC 3339 format
-
-      format: date-time
-
-    - `type: "session.updated"`
-
-    - `agent: optional BetaManagedAgentsSessionAgent or null`
-
-      Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time.
-
-      - `id: string`
-
-      - `description: string or null`
-
-      - `mcp_servers: array of BetaManagedAgentsMCPServerURLDefinition`
-
-        - `name: string`
-
-        - `type: "url"`
-
-        - `url: string`
-
-      - `model: BetaManagedAgentsModelConfig`
-
-        Model identifier and configuration.
-
-        - `id: BetaManagedAgentsModel`
-
-          The model that will power your agent.
-
-          See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
-
-          - `"claude-sonnet-5" or "claude-fable-5" or "claude-opus-5" or 10 more`
-
-            The model that will power your agent.
-
-            See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
-
-            - `"claude-sonnet-5"`
-
-              High-performance model for coding and agents
-
-            - `"claude-fable-5"`
-
-              Next generation of intelligence for the hardest knowledge work and coding problems
-
-            - `"claude-opus-5"`
-
-              Powerful intelligence for long-running agents and coding
-
-            - `"claude-opus-4-8"`
-
-              Powerful intelligence for long-
+    Emit