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Ruby MCP SDK: Missing Jsonrpc Recovery | MCP Failure Observatory

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Test run

Ruby MCP SDK

Missing Jsonrpc Recovery

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ImplementationRuby MCP SDKv1.6.1

StatusFailed

Transportstdio

TestedOct 5, 2026

Duration488 ms

Observations

Recorded behavior from this compatibility test.

RuntimeError: Malformed response was accepted

Evidence

Supporting records captured for this run.

1

error

RuntimeError: Malformed response was accepted

Source: https://github.com/anilloutombam/mcp-failure-lab/blob/main/docs/compatibility/ruby-sdk-1.6.1.md

View raw evidence

RuntimeError: Malformed response was accepted

Run details

Scenario: Missing Jsonrpc Recovery
Category: protocol
Version: 1.6.1
Run ID: 2031fc76-ec0a-4932-81a3-8f9c92fbe643

Source report Implementation repository

MCP compatibility data, with evidence and limitations in context.

Methodology & limitations Source code MCP Failure Lab