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105 lines
3.1 KiB
Go

// Copyright 2026 Alibaba Group
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package errors
import (
stderrors "errors"
"strings"
)
// ServerDiagnostics holds server-side diagnostic fields extracted from
// MCP response bodies or HTTP response headers. Fields are populated
// on a best-effort basis during error construction.
type ServerDiagnostics struct {
TraceID string `json:"trace_id,omitempty"`
ServerErrorCode string `json:"server_error_code,omitempty"`
TechnicalDetail string `json:"technical_detail,omitempty"`
FriendlyHint string `json:"friendly_hint,omitempty"`
ActionURL string `json:"action_url,omitempty"`
ServerRetryable *bool `json:"server_retryable,omitempty"`
}
// IsEmpty returns true when no diagnostic field has been populated.
func (d ServerDiagnostics) IsEmpty() bool {
return d.TraceID == "" && d.ServerErrorCode == "" &&
d.TechnicalDetail == "" && d.FriendlyHint == "" &&
d.ActionURL == "" && d.ServerRetryable == nil
}
// WithServerDiag attaches server diagnostics to the error.
func WithServerDiag(diag ServerDiagnostics) Option {
if diag.IsEmpty() {
return func(*Error) {}
}
return func(e *Error) {
e.ServerDiag = diag
// Override retryable if server explicitly specified.
if diag.ServerRetryable != nil {
e.Retryable = *diag.ServerRetryable
e.RetryableSet = true
}
}
}
// WithTraceID records the server-provided trace identifier.
// Used when only the trace ID is available (e.g. from HTTP headers)
// without a full ServerDiagnostics struct.
func WithTraceID(id string) Option {
id = strings.TrimSpace(id)
if id == "" {
return func(*Error) {}
}
return func(e *Error) {
e.ServerDiag.TraceID = id
}
}
// IsMCPToolNotFound reports whether an MCP call failed because the selected
// server does not expose that tool name. Callers may use it to fall back
// between reviewed read-only aliases, never to replay a write.
func IsMCPToolNotFound(err error) bool {
if err == nil {
return false
}
parts := []string{err.Error()}
var typed *Error
if stderrors.As(err, &typed) && typed != nil {
parts = append(parts,
typed.Reason,
typed.ServerDiag.ServerErrorCode,
typed.ServerDiag.TechnicalDetail,
typed.Hint,
)
}
message := strings.ToLower(strings.Join(parts, " "))
for _, marker := range []string{
"tool_not_found",
"mcp_tool_not_found",
"tool not found",
"tool not registered",
"tool not exist",
"tool does not exist",
"unknown tool",
"no such tool",
"未找到指定工具",
"未找到工具",
"工具不存在",
} {
if strings.Contains(message, marker) {
return true
}
}
return false
}