Add MCP structured tool output (outputSchema + structuredContent)#238
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| Complexity | 10 |
| Duplication | 0 |
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Medium-integration batch — MCP 2025-06-18 structured tool output (framework enhancement; no new AC_* command).
Change
MCPToolgains an optionaloutput_schema;to_descriptor()advertises it asoutputSchemaintools/list.structuredContent(the dict result) in atools/callresponse when the tool declares anoutput_schemaand the handler returns a dict; non-dict results and schema-less tools are unchanged.ac_validate_rowsis the first built-in to adopt it ({ok,total,valid_count,invalid_count,valid,invalid,errors}).Verification
test/unit_test/headless/test_mcp_structured_output.py— 4 tests (descriptor outputSchema, structuredContent only with schema, non-dict excluded, default-registry adoption). ruff/radon/bandit clean.