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Agents2026-08-20 · source-backed
It carries subtype, errors, api_error_status, terminal_reason and session_id, so callers can stop string-matching on failure text. The release also widens the MCP dependency to >=1.23.0,<3.0.0 and serves in-process SDK MCP servers over mcp's own in-memory transport instead of hand-rolled JSON-RPC, so hand-built mcp.server.Server instances now pass resources, prompts and all result content types through verbatim. Plus forward_subagent_text for streaming subagent thinking. (GitHub)
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