Claude Opus 5.5 tool_choice 400: 3 SDKs Tested (2026)
September 25, 2026
Claude Opus 5.5 rejects forced tool_choice with a 400. I captured what the AI SDK, LangChain and the raw SDK actually send, and built a preflight check.
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OpenTelemetry gen_ai Attributes: 60 Deprecated in 2026
September 24, 2026
All 60 gen_ai attributes in OpenTelemetry's core semantic conventions are now deprecated. I audited every release: 8 renamed, 2 removed, 50 simply moved.
AI SDK Tool Drift Detection: What It Misses in 2026
September 23, 2026
I tested AI SDK v7 fingerprintTools and detectToolDrift against a real MCP server. It catches description and schema rug pulls, but not annotation drift.
MCP Tasks Extension: A Working Python Server (2026)
September 22, 2026
The ratified MCP Tasks extension needs three new methods. The official Python SDK v2.2.0 still doesn't implement them. Here's a tested server that does.
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