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mcp: return json-rpc error on stateful server serving protocolVersion20260728 requests (#1143)

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Fixes #1130
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Guglielmo Colombo 2026-08-05 12:16:39 +02:00 • committed by GitHub
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internal/docs/mcpgodebug.src.md
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@ -17,6 +17,22 @@
## `MCPGODEBUG` history
### 1.8.0
Options listed below were added and will be removed in the 1.9.0 version of the SDK.
- `plaintextstatefulrejection` added. If set to `1`, a stateful
`StreamableHTTPHandler` will respond with a plain-text `http.Error` 400 body
when it receives a request carrying per-request metadata (i.e. an
`io.modelcontextprotocol/protocolVersion` `_meta` field, or an
`MCP-Protocol-Version` header >= `2026-07-28`), restoring the previous
behavior. The default behavior was changed so that the server responds with a
JSON-RPC error of code `CodeUnsupportedProtocolVersion` (`-32022`) carrying
an `UnsupportedProtocolVersionData` payload that advertises the legacy
versions the server supports. This lets the client's
existing renegotiation logic recover and prevents the failure from tearing
down the underlying connection.
### 1.7.0
Options listed below were added and will be removed in the 1.9.0 version of the SDK.