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Log tool changes as developer messages independently of model capability, fold committed headers and updates into Session.toolHistory(), and let the LLM runtime construct deferred and retained declarations for routes that declare a toolUpdate mode. DeepSeek serializes updates as system-role tool_addition/tool_removal blocks with defer_loading and the tool-changes beta header. An unchanged restored tool continues the series and is re-offered through its recorded blocks instead of rewriting declarations. Replace the obsolete rejection tests with wire assertions and add coverage for the session fold, loop emission, route projection, config validation, and the beta header. Chat and Trajectory changes land separately.