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MCP protocol updated to support full JSON Schema 2020-12

By PulseAugur Editorial · [1 sources] ·

The Model Context Protocol (MCP) has been updated with SEP-2106, allowing tools to use the full JSON Schema 2020-12 vocabulary for defining their inputs and outputs. This enhancement enables more complex validation rules, including composition and conditional logic, to be embedded directly within the schema rather than relying on prose descriptions. The update also expands the `structuredContent` field to accept any JSON value, not just objects, providing greater flexibility for tool communication. AI

IMPACT Enhances tool definition and validation, enabling more robust agent-tool interactions.

RANK_REASON This is an update to a protocol specification, detailing new capabilities for defining tool inputs and outputs using JSON Schema. [lever_c_demoted from research: ic=1 ai=0.7]

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

MCP protocol updated to support full JSON Schema 2020-12

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This is an update to a protocol specification, detailing new capabilities for defining tool inputs and outputs using JSON Schema. [lever_c_demoted from research: ic=1 ai=0.7]
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  1. dev.to — MCP tag TIER_1 English(EN) · pueding ·

    MCP SEP-2106: Full JSON Schema 2020-12 in Tool I/O

    <p><strong>What:</strong> <strong>MCP SEP-2106</strong> — merged into the protocol on May 18, 2026 — lets an MCP tool describe its inputs and outputs with the full JSON Schema 2020-12 keyword set in <code>inputSchema</code> and <code>outputSchema</code>, and widens <code>structur…

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