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refactor: remove legacy MCPGODEBUG compatibility for new protocol release (#1237)

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Guglielmo Colombo 2026-09-04 10:08:52 +02:00 • committed by GitHub
commit 3f3b699b2b
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1 changed files with 41 additions and 42 deletions
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12
mcp/protocol.go
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@ -329,23 +329,13 @@ type CallToolResult struct {
err error
}
// seterroroverwrite is a compatibility parameter that restores the pre-1.6.0
// behavior of [CallToolResult.SetError], where Content was always overwritten
// with the error text. See the documentation for the mcpgodebug package for
// instructions on how to enable it.
// The option will be removed in the 1.8.0 version of the SDK.
var seterroroverwrite = mcpgodebug.Value("seterroroverwrite")
// SetError sets the error for the tool result and sets IsError to true.
// If Content has not already been populated, it is set to the error text.
// If Content has already been populated, it is left unchanged, allowing callers
// to provide a user-friendly message while still recording the underlying error
// for inspection via [GetError] in server middleware.
//
// To restore the previous behavior where Content was always overwritten,
// set MCPGODEBUG=seterroroverwrite=1.
func (r *CallToolResult) SetError(err error) {
if len(r.Content) == 0 || seterroroverwrite == "1" {
if len(r.Content) == 0 {
r.Content = []Content{&TextContent{Text: err.Error()}}
}
r.IsError = true