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fix(agents): prevent Bedrock replay death loop on empty assistant content (#71627)

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* fix(agents): prevent Bedrock replay death loop on empty assistant content

  Fixes #71572

* docs: document Bedrock replay repair (#71627) (thanks @openperf)

* fix(diagnostics): share diagnostic event state across sdk graphs

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>
This commit is contained in:
Chunyue Wang
2026-04-26 02:04:40 +08:00
committed by GitHub
parent ff172f46a5
commit 930d81aa41
9 changed files with 500 additions and 35 deletions
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21
docs/reference/transcript-hygiene.md
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@@ -8,11 +8,12 @@ title: "Transcript hygiene"
---
This document describes **provider-specific fixes** applied to transcripts before a run
(building model context). These are **in-memory** adjustments used to satisfy strict
provider requirements. These hygiene steps do **not** rewrite the stored JSONL transcript
on disk; however, a separate session-file repair pass may rewrite malformed JSONL files
by dropping invalid lines before the session is loaded. When a repair occurs, the original
file is backed up alongside the session file.
(building model context). Most of these are **in-memory** adjustments used to satisfy
strict provider requirements. A separate session-file repair pass may also rewrite
stored JSONL before the session is loaded, either by dropping malformed JSONL lines or
by repairing persisted turns that are syntactically valid but known to be rejected by a
provider during replay. When a repair occurs, the original file is backed up alongside
the session file.
Scope includes:
@@ -24,6 +25,7 @@ Scope includes:
- Thought signature cleanup
- Image payload sanitization
- User-input provenance tagging (for inter-session routed prompts)
- Empty assistant error-turn repair for Bedrock Converse replay
If you need transcript storage details, see:
@@ -132,6 +134,15 @@ external end-user instructions.
- Tool result pairing repair and synthetic tool results.
- Turn validation (merge consecutive user turns to satisfy strict alternation).
**Amazon Bedrock (Converse API)**
- Empty assistant stream-error turns are repaired to a non-empty fallback text block
before replay. Bedrock Converse rejects assistant messages with `content: []`, so
persisted assistant turns with `stopReason: "error"` and empty content are also
repaired on disk before load.
- Replay filters OpenClaw delivery-mirror and gateway-injected assistant turns.
- Image sanitization applies through the global rule.
**Mistral (including model-id based detection)**
- Tool call id sanitization: strict9 (alphanumeric length 9).