[github-actions]

agentgateway/agentgateway#4115 — fix(llm): drop unsigned thinking blocks when replaying Messages to Bedrock

Docs versions: standalone/main, kubernetes/main

What changes for users: Clients that replay Anthropic Messages history to Bedrock can include an assistant thinking block whose signature is empty. The Bedrock request drops that unsigned block instead of sending invalid reasoning content, so the conversation can continue.

What the docs now say: No content page changed. The proposed LLM fix release note says that Messages replay to Bedrock drops assistant thinking blocks whose signature is empty.

Not verified: No cluster or Bedrock provider was configured in this sandbox, so the replay request is unrun. Internal links are unchecked.

How agentgateway-4115 was drafted, and what was not verified

• Code PR: fix(llm): drop unsigned thinking blocks when replaying Messages to Bedrock agentgateway#4115
• Code issue: Bedrock: replaying a thinking block on /v1/messages sends reasoningContent that GPT models reject (400) agentgateway#4114
• Product: agentgateway (upstream) → agentgateway/website
• Docs version: standalone/main and kubernetes/main
• Category: release-note-entry / pr

Plan, and what changed it

• Planned: Write a release-note-only fix entry for Bedrock Messages replay.
• Learned: The candidate pages describe Bedrock reasoning replay but do not document unsigned thinking blocks as intended behavior, and neighbors/agentgateway-4211.md covers a separate thinking.display forwarding fix.

Why a documentation change is necessary

The diff changes Bedrock conversion so an assistant thinking block with an empty signature is skipped before the request is sent to Bedrock. The test fixture adds exactly that replay case and the Bedrock snapshot no longer contains a reasoningContent.reasoningText block for it. The existing Messages and Bedrock pages explain signed and encrypted reasoning replay, but they do not tell readers to rely on the rejected unsigned behavior, so the user-facing change belongs in the Fixes release notes.

How to verify this change

1. Configure a Bedrock LLM provider and route /v1/messages traffic to it.
2. Send a Messages request whose history includes an assistant thinking block with "signature": "", followed by another user message.
3. Capture the converted Bedrock request or run the reasoning replay request test. The Bedrock request should omit the unsigned thinking block and should not send reasoningContent.reasoningText for Nothing to add.

What was not verified

The configuration and replay request were not applied to a cluster or Bedrock provider, so every verification command is unrun. Internal links are unchecked because Hugo was not run.

How the pages were chosen (triage report)

Draft a release-note entry: a fix no page documents

agentgateway/agentgateway#4115 — fix(llm): drop unsigned thinking blocks when replaying Messages to Bedrock

• Product: agentgateway (upstream) → agentgateway/website
• Docs version: standalone/main, kubernetes/main
• Code issue: Bedrock: replaying a thinking block on /v1/messages sends reasoningContent that GPT models reject (400) agentgateway#4114
• Summary (the title; the body has no description): drop unsigned thinking blocks when replaying Messages to Bedrock
• Not tested: no cluster was available, so every command in this diff is unrun

Release notes

This pull request also adds its release-note entries:

• content/docs/kubernetes/main/release-notes/release-notes.md: fix(llm): drop unsigned thinking blocks when replaying Messages to Bedrock (fix, under LLM, in a new 1.8 section)
• content/docs/standalone/main/release-notes/release-notes.md: fix(llm): drop unsigned thinking blocks when replaying Messages to Bedrock (fix, under LLM, in a new 1.8 section)

Draft branch: pr-tracker-draft-agentgateway-4115

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[kristin-kronstain-brown]

Closing because this PR only changed release notes. Its entries are now in the combined release-notes PR, #1482.