| 1 | package provider |
| 2 | |
| 3 | import "slices" |
| 4 | |
| 5 | // Two copies of a transcript are derived from the stored one: the bytes a |
| 6 | // provider receives, and the projection compaction writes back. They differ in |
| 7 | // exactly one field, and that difference is load-bearing. |
| 8 | |
| 9 | // ModelMessages removes durable display-only records before a request is |
| 10 | // handed to any provider. Healthy sessions without such records keep their |
| 11 | // original backing slice, preserving the allocation and prompt-cache fast path. |
| 12 | func ModelMessages(msgs []Message) []Message { return projectMessages(msgs, false, false) } |
| 13 | |
| 14 | // ProjectionMessages is ModelMessages for a stored projection, except that |
| 15 | // ToolExecution and Origin survive: a projection is also the next compaction's |
| 16 | // input, and those records classify tool failures and host-authored protocol |
| 17 | // messages. Stripping belongs at the provider boundary, which every request |
| 18 | // path already crosses. |
| 19 | func ProjectionMessages(msgs []Message) []Message { return projectMessages(msgs, true, true) } |
| 20 | |
| 21 | func messagesNeedProjection(msgs []Message, keepExecution, keepOrigin bool) bool { |
| 22 | for _, m := range msgs { |
| 23 | if m.InterruptedTurn != nil || slices.ContainsFunc(m.ToolCalls, func(c ToolCall) bool { return c.Recovery != nil }) || m.ReadPause != nil || m.ReadCompletion != nil || len(m.ToolDiagnostic) > 0 { |
| 24 | return true |
| 25 | } |
| 26 | if slices.ContainsFunc(m.ServerSearch, func(s ServerSearchCall) bool { return s.SourcesStatus != "" }) || len(m.ProtocolRecovery) > 0 || (!keepExecution && slices.ContainsFunc(m.ToolCalls, func(c ToolCall) bool { return len(c.WriteIntents) > 0 })) || m.LocalOnly || (!keepOrigin && m.Origin != "") || m.RawContent != "" || m.ProviderContent != "" || m.DecisionReceipt != nil || len(m.DecisionReceipts) > 0 || m.VisionSummary != nil || m.MCPApp != nil || len(m.ReadResult) > 0 || (!keepExecution && m.PresentedFiles != nil) || ((m.ToolExecution != nil || m.ToolRunState != "") && !keepExecution) { |
| 27 | return true |
| 28 | } |
| 29 | } |
| 30 | return false |
| 31 | } |
| 32 | |
| 33 | func projectMessages(msgs []Message, keepExecution, keepOrigin bool) []Message { |
| 34 | if !messagesNeedProjection(msgs, keepExecution, keepOrigin) { |
| 35 | return msgs |
| 36 | } |
| 37 | out := make([]Message, 0, len(msgs)) |
| 38 | for _, candidate := range msgs { |
| 39 | if candidate.LocalOnly { |
| 40 | continue |
| 41 | } |
| 42 | if candidate.ProviderContent != "" { |
| 43 | candidate.Content = candidate.ProviderContent |
| 44 | candidate.ProviderContent = "" |
| 45 | } |
| 46 | candidate.RawContent = "" |
| 47 | candidate.ProtocolRecovery = nil |
| 48 | // Read delivery envelopes are host evidence; they must never change |
| 49 | // provider bytes. |
| 50 | candidate.ReadResult = nil |
| 51 | candidate.ReadPause = nil |
| 52 | candidate.InterruptedTurn = nil |
| 53 | candidate.ReadCompletion = nil |
| 54 | candidate.ToolDiagnostic = nil |
| 55 | if !keepExecution && slices.ContainsFunc(candidate.ServerSearch, func(s ServerSearchCall) bool { return s.SourcesStatus != "" }) { |
| 56 | candidate.ServerSearch = append([]ServerSearchCall(nil), candidate.ServerSearch...) |
| 57 | for i := range candidate.ServerSearch { |
| 58 | candidate.ServerSearch[i].SourcesStatus = "" |
| 59 | } |
| 60 | } |
| 61 | if !keepOrigin { |
| 62 | candidate.Origin = "" |
| 63 | } |
| 64 | candidate.DecisionReceipt = nil |
| 65 | candidate.DecisionReceipts = nil |
| 66 | candidate.VisionSummary = nil |
| 67 | // Apps presentation stays local; it must never change provider bytes. |
| 68 | candidate.MCPApp = nil |
| 69 | if !keepExecution { |
| 70 | // Local shell metadata must never enter provider request bytes. |
| 71 | candidate.ToolExecution = nil |
| 72 | candidate.ToolRunState = "" |
| 73 | candidate.PresentedFiles = nil |
| 74 | if slices.ContainsFunc(candidate.ToolCalls, func(c ToolCall) bool { return len(c.WriteIntents) > 0 || c.Recovery != nil }) { |
| 75 | candidate.ToolCalls = append([]ToolCall(nil), candidate.ToolCalls...) |
| 76 | for i := range candidate.ToolCalls { |
| 77 | candidate.ToolCalls[i].WriteIntents = nil |
| 78 | candidate.ToolCalls[i].Recovery = nil |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | out = append(out, candidate) |
| 83 | } |
| 84 | return out |
| 85 | } |
| 86 |