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    "subjectKind": "AgentVersion",
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    "attribute": "thinkingBlockHandling",
    "value": "opus-4.8-thinking-block-api-error-fix",
    "statement": "Claude Code v2.1.156 fixes Opus 4.8 thinking blocks being modified in a way that caused API errors.",
    "confidence": "high",
    "provenanceKind": "release-notes",
    "evidenceStrength": "strong",
    "status": "accepted",
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    "claimedAt": "2026-05-29T11:20:00Z",
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