Go MCP SDK: Malformed Version

ImplementationGo MCP SDKv1.7.0

StatusFailed

TransportHTTP

TestedOct 4, 2026

Duration2 ms

Observations

Recorded behavior from this compatibility test.

connection closed: calling "tools/call": client is closing: sending "tools/call": failed to decode response: invalid message version tag "1.0"; expected "2.0"

Evidence

Supporting records captured for this run.

error

connection closed: calling "tools/call": client is closing: sending "tools/call": failed to decode response: invalid message version tag "1.0"; expected "2.0"

Source: https://github.com/anilloutombam/mcp-failure-lab/blob/main/docs/compatibility/v0.12.0.md

View raw evidence

connection closed: calling "tools/call": client is closing: sending "tools/call": failed to decode response: invalid message version tag "1.0"; expected "2.0"

Loading test run

Observations

Evidence

connection closed: calling "tools/call": client is closing: sending "tools/call": failed to decode response: invalid message version tag "1.0"; expected "2.0"