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fix(mcp): prevent SIGSEGV in AddTool when schema is nil #918

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fix(mcp): prevent SIGSEGV in AddTool when schema is nil #918

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7 changes: 7 additions & 0 deletions mcp/server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -437,6 +437,9 @@ func setSchema[T any](sfield *any, rfield **jsonschema.Resolved, cache *SchemaCa
if err != nil {
return zero, err
}
if internalSchema == nil {
return zero, fmt.Errorf("schema is nil for type %v", rt)
}
*sfield = internalSchema

resolved, err := internalSchema.Resolve(&jsonschema.ResolveOptions{ValidateDefaults: true})
Expand Down Expand Up @@ -466,6 +469,10 @@ func setSchema[T any](sfield *any, rfield **jsonschema.Resolved, cache *SchemaCa
}
}

if internalSchema == nil {
return zero, fmt.Errorf("schema is nil for type %v", rt)
}

resolved, err := internalSchema.Resolve(&jsonschema.ResolveOptions{ValidateDefaults: true})
if err != nil {
return zero, err
Expand Down