modelcontextprotocol/go-sdk
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  • v1.2.0-pre.1 875d1d30c2

    mcp: don't break the streamable client connection for transient errors (#723)

    Ghost released this 2025-12-12 18:49:41 +00:00 | 262 commits to main since this release

    When POST requests in the streamableClientConn return a transient error,
    return this error to the caller rather than permanently breaking the
    connection.

    This is achieved by using the special sentinel ErrRejected error to the
    jsonrpc2 layer. In doing so, the change revealed a pre-existing bug:
    ErrRejected had the same code as ErrConnectionClosing, and
    jsonrpc2.WireError implements errors.Is, so the two sentinel values
    could be conflated. This is fixed by using a new internal code.

    There's more to do for #683: we should also retry transient errors in
    handleSSE.

    For #683

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