CATCH #1962
DETECTED OCT 9, 2026 16:24 UTC
THE CATCHscore 7/10
EXHIBIT 1962 · URGENT
Oct 9, 2026 16:24 UTC
docs
https://platform.claude.com/docs/en/release-notes/api
Anthropic's API changelog shows new beta features for Claude Managed Agents, including dynamic workflows and updated `multiagent` field, along with changes to error handling and thinking block display.
READY TO POST:
anthropic's api changelog hints at new dynamic workflows for claude managed agents! looks like agents will soon be able to write their own multi-phase programs. pretty wild.
new beta header `managed-agents-2026-04-01` spotted in anthropic's docs, enabling dynamic workflows for claude agents. also, thinking blocks might be summarized by default now.
EVIDENCE — the receipts
Anthropic API changelog changed: https://platform.claude.com/docs/en/release-notes/api
41 added lines
---
+++
@@ -53,2 +53,19 @@
repository.
+October 9, 2026
+
+You can now let a Claude Managed Agents agent use
+dynamic workflows
+, in beta with the
+managed-agents-2026-04-01
+beta header. For work with many pieces, such as reviewing hundreds of documents, the agent can write a workflow. A workflow is a program that runs many agents in phases and combines their results. The server runs it in the background as a workflow run. To
+turn dynamic workflows on
+, set the agent's
+multiagent
+field to
+{"type": "multiagent_20261001", "workflows": {"type": "enabled"}}
+. To guide the agent, tell it in its system prompt when to start a run. Follow each run through
+workflow_run.*
+events on the session's event stream. See
+Workflow runs
+.
October 8, 2026
@@ -88,7 +105,27 @@
budget_tokens
-) returns a 400 error, and adaptive thinking is on by default, so a response can begin with
+), the sampling parameters
+temperature
+,
+top_p
+, and
+top_k
+, and assistant message prefill can each return a 400 error.
+computer_20250124
+also returns a 400 error: use the
+computer_toolset_20260801
+toolset on the Claude API and Google Cloud, or
+computer_20251124
+on Amazon Bedrock. A request that sends thinking blocks back after a change to
+system
+,
+tools
+, or earlier turns can also return a 400 error. On Amazon Bedrock, structured outputs aren't available for Claude Haiku 5.5. Adaptive thinking is on by default, so a response can begin with
thinking
-blocks. The same text also counts as more tokens. See the
+blocks, and their text is omitted unless you set
+thinking.display
+to
+"summarized"
+. The same text also counts as more tokens. See the
migration guide
-. For model-specific prompting patterns, see
+for each change. For model-specific prompting patterns, see
Prompting Claude Haiku 5.5
@@ -2649,2 +2686,3 @@
+October 9, 2026
October 8, 2026
caught by the 20-minute sweep ·
the live wire · all receipts