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    MCP 2025-to-2026 Era Migration Proof

    1

    Prove a fixed MCP upgrade is compatible before you ship.

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    See it in action

    You say

    Verify the migration compatibility between ./snapshots/old_contract.json and ./snapshots/new_contract.json. Output the results to the ./audit-logs directory.

    Your agent does

    Audit complete. Status: FAIL. Found 2 BREAKING changes in tool schema required fields. Artifacts generated:

    • compatibility.json (authoritative)
    • compatibility.md (summary)
    • evidence-receipt.json

    What you get

    Audit MCP contract snapshots for breaking protocol changes.Identify required manual interventions in JSON schema transitions.Generate integrity-hashed evidence for MCP migration review.Block ambiguous or unsupported migration results instead of returning a false PASS.

    About this skill

    The problem

    Manually verifying Model Context Protocol (MCP) contract compatibility during the 2025-to-2026 era migration is error-prone. Developers lack a deterministic way to audit breaking changes between local protocol snapshots without risking subjective LLM hallucinations.

    What it does

    • Performs deterministic comparison between 2025-11-25 and 2026-07-28 MCP snapshots.
    • Generates five auditable artifacts including compatibility reports and evidence receipts.
    • Enforces a fail-closed gate resulting in PASS, FAIL, or NEED_USER based on migration rules.
    • Validates JSON depth, value-node counts, and type-aware canonical semantics.
    • Detects breaking changes in tools, prompts, and schema annotations via local execution.

    Frameworks & tools

    Python, Model Context Protocol (MCP), JSON Schema, SHA-256 integrity hashing.

    Why this beats prompting it yourself

    Prompting an LLM to "check for compatibility" leads to missed edge cases in JSON schema evolution. This tool uses a rigid, script-based collector that prevents subjective upgrades of FAIL or NEED_USER statuses, ensuring 100% auditability.

    Use cases

    • Verifying tool and prompt compatibility before upgrading MCP server implementations.
    • Generating compliance evidence for internal architectural reviews.
    • Debugging malformed JSON schema transitions between protocol revisions.

    Known limitations

    Only supports the 2025-11-25 to 2026-07-28 revision boundary. Rejects network shares, remote volumes, and Windows UNC paths. Does not perform automatic fixes or tool execution.

    How to install

    Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.

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