| 1 | package provider |
| 2 | |
| 3 | import ( |
| 4 | "encoding/json" |
| 5 | "fmt" |
| 6 | "strings" |
| 7 | ) |
| 8 | |
| 9 | // ValidateTranscript validates a request view without changing history or |
| 10 | // inventing tool results. IDs are scoped to one assistant batch. |
| 11 | func ValidateTranscript(msgs []Message) error { |
| 12 | pending := map[string]string{} |
| 13 | for i, m := range msgs { |
| 14 | if m.Role != RoleTool && len(pending) != 0 { |
| 15 | return fmt.Errorf("transcript gate: unanswered tool calls before message %d", i) |
| 16 | } |
| 17 | for _, c := range m.ToolCalls { |
| 18 | if m.Role != RoleAssistant || strings.TrimSpace(c.ID) == "" || strings.TrimSpace(c.Name) == "" { |
| 19 | return fmt.Errorf("transcript gate: invalid tool identity at message %d", i) |
| 20 | } |
| 21 | if _, exists := pending[c.ID]; exists { |
| 22 | return fmt.Errorf("transcript gate: duplicate call ID at message %d", i) |
| 23 | } |
| 24 | var args map[string]json.RawMessage |
| 25 | if json.Unmarshal([]byte(c.Arguments), &args) != nil || args == nil { |
| 26 | return fmt.Errorf("transcript gate: tool arguments must be a JSON object at message %d", i) |
| 27 | } |
| 28 | pending[c.ID] = c.Name |
| 29 | } |
| 30 | if m.Role == RoleTool { |
| 31 | name, found := pending[m.ToolCallID] |
| 32 | if !found || (m.Name != "" && m.Name != name) { |
| 33 | return fmt.Errorf("transcript gate: orphan or mismatched result at message %d", i) |
| 34 | } |
| 35 | delete(pending, m.ToolCallID) |
| 36 | } |
| 37 | } |
| 38 | if len(pending) > 0 { |
| 39 | return fmt.Errorf("transcript gate: unanswered tool calls") |
| 40 | } |
| 41 | return nil |
| 42 | } |
| 43 | |
| 44 | // ValidateModelTranscript uses the adapters' pairing-normalized view. Invalid |
| 45 | // arguments are rejected before normalizers can silently replace them. |
| 46 | func ValidateModelTranscript(msgs []Message) error { |
| 47 | view := ModelMessages(msgs) |
| 48 | for i, m := range view { |
| 49 | for _, c := range m.ToolCalls { |
| 50 | var args map[string]json.RawMessage |
| 51 | if json.Unmarshal([]byte(c.Arguments), &args) != nil || args == nil { |
| 52 | return fmt.Errorf("transcript gate: tool arguments must be a JSON object at message %d", i) |
| 53 | } |
| 54 | } |
| 55 | } |
| 56 | view = append([]Message(nil), SanitizeToolPairing(view)...) |
| 57 | // Some compatible gateways stream by index and omit IDs. Validate using |
| 58 | // request-local positional identities, retaining their existing wire path. |
| 59 | var empty []ToolCall |
| 60 | for i := range view { |
| 61 | m := &view[i] |
| 62 | if len(m.ToolCalls) > 0 { |
| 63 | empty = nil |
| 64 | m.ToolCalls = append([]ToolCall(nil), m.ToolCalls...) |
| 65 | for j := range m.ToolCalls { |
| 66 | if m.ToolCalls[j].ID == "" { |
| 67 | m.ToolCalls[j].ID = fmt.Sprintf("legacy-%d-%d", i, j) |
| 68 | empty = append(empty, m.ToolCalls[j]) |
| 69 | } |
| 70 | } |
| 71 | } else if m.Role == RoleTool && m.ToolCallID == "" { |
| 72 | for j, c := range empty { |
| 73 | if c.Name == m.Name { |
| 74 | m.ToolCallID = c.ID |
| 75 | empty = append(empty[:j], empty[j+1:]...) |
| 76 | break |
| 77 | } |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | return ValidateTranscript(view) |
| 82 | } |
| 83 | |
| 84 | // RepairRejectedArguments changes only the outbound copy of calls the host |
| 85 | // proved never ran. Their validation-error result remains available for the |
| 86 | // model to correct its next proposal; stored arguments remain inspectable. |
| 87 | func RepairRejectedArguments(msgs []Message) []Message { |
| 88 | out := append([]Message(nil), msgs...) |
| 89 | for i, m := range out { |
| 90 | if m.Role != RoleAssistant { |
| 91 | continue |
| 92 | } |
| 93 | for j, c := range m.ToolCalls { |
| 94 | var args map[string]json.RawMessage |
| 95 | if json.Unmarshal([]byte(c.Arguments), &args) == nil && args != nil { |
| 96 | continue |
| 97 | } |
| 98 | for k := i + 1; k < len(out) && out[k].Role == RoleTool; k++ { |
| 99 | r := out[k] |
| 100 | if r.ToolCallID == c.ID && r.Name == c.Name && (r.ToolRunState == ToolRunNotStarted || r.ToolRunState == ToolRunCancelled) { |
| 101 | out[i].ToolCalls = append([]ToolCall(nil), out[i].ToolCalls...) |
| 102 | out[i].ToolCalls[j].Arguments = "{}" |
| 103 | break |
| 104 | } |
| 105 | } |
| 106 | } |
| 107 | } |
| 108 | return out |
| 109 | } |
| 110 |