Under the hood
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Rejected mid-conversation tool additions are now sorted into specific 400-error reasons for retry and telemetry.
New internal classification logic sorts 400 errors from beta tool-use blocks into specific reasons: header_rejected, block_type_unknown, after_paused_turn, model_unsupported, too_many_definitions, pfc_only, unknown_tool_reference, or other. This applies when a tool_addition or tool_removal request is rejected, likely feeding retry and telemetry logic for beta feature flags.
Names in the bundleheader_rejectedmodel_unsupportedtoo_many_definitions