| 1 | package agent |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "strings" |
| 6 | "unicode/utf8" |
| 7 | |
| 8 | "reasonix/internal/provider" |
| 9 | "reasonix/internal/tool" |
| 10 | ) |
| 11 | |
| 12 | // Legacy snip helpers still support compatibility storage. Their public APIs |
| 13 | // are no-ops; pressure-time Harness pruning uses the rune-based policy below. |
| 14 | const ( |
| 15 | snippedMarker = "[snipped tool result — " |
| 16 | prunedMarker = "[elided tool result — " |
| 17 | minPruneBytes = 1024 |
| 18 | |
| 19 | toolPruneThresholdRunes = 8192 |
| 20 | toolPruneHeadRunes = 4096 |
| 21 | toolPruneTailRunes = 1024 |
| 22 | toolPruneMarker = "[... tool result middle pruned ...]" |
| 23 | ) |
| 24 | |
| 25 | func pruneToolResultContent(content string) (string, bool) { |
| 26 | if utf8.RuneCountInString(content) <= toolPruneThresholdRunes { |
| 27 | return content, false |
| 28 | } |
| 29 | headEnd := byteOffsetAfterRunes(content, toolPruneHeadRunes) |
| 30 | tailStart := byteOffsetBeforeLastRunes(content, toolPruneTailRunes) |
| 31 | var pruned strings.Builder |
| 32 | pruned.Grow(headEnd + len(toolPruneMarker) + len(content) - tailStart) |
| 33 | pruned.WriteString(content[:headEnd]) |
| 34 | pruned.WriteString(toolPruneMarker) |
| 35 | pruned.WriteString(content[tailStart:]) |
| 36 | return pruned.String(), true |
| 37 | } |
| 38 | |
| 39 | func byteOffsetAfterRunes(content string, count int) int { |
| 40 | if count <= 0 { |
| 41 | return 0 |
| 42 | } |
| 43 | seen := 0 |
| 44 | for offset := range content { |
| 45 | if seen == count { |
| 46 | return offset |
| 47 | } |
| 48 | seen++ |
| 49 | } |
| 50 | return len(content) |
| 51 | } |
| 52 | |
| 53 | func byteOffsetBeforeLastRunes(content string, count int) int { |
| 54 | offset := len(content) |
| 55 | for range count { |
| 56 | if offset == 0 { |
| 57 | return 0 |
| 58 | } |
| 59 | _, size := utf8.DecodeLastRuneInString(content[:offset]) |
| 60 | offset -= size |
| 61 | } |
| 62 | return offset |
| 63 | } |
| 64 | |
| 65 | // pruneToolResultsToProjectionLocked installs a durable, model-visible prune |
| 66 | // projection. The caller owns compactionRunMu for the whole maintenance run; |
| 67 | // canonical storage, including RawContent, is never modified. |
| 68 | func (a *Agent) pruneToolResultsToProjectionLocked(ctx context.Context, trigger string) (bool, error) { |
| 69 | if ctx == nil { |
| 70 | ctx = context.Background() |
| 71 | } |
| 72 | if err := ctx.Err(); err != nil { |
| 73 | return false, err |
| 74 | } |
| 75 | canonical, transcriptVersion := a.sess.conversation.snapshotMessagesVersion() |
| 76 | a.sess.compactionMu.Lock() |
| 77 | stateSnapshot := a.sess.compactionState |
| 78 | a.sess.compactionMu.Unlock() |
| 79 | visible, _ := a.visibleInputForFold(stateSnapshot, canonical, transcriptVersion) |
| 80 | projected := append([]provider.Message(nil), visible...) |
| 81 | affected := 0 |
| 82 | for i := range projected { |
| 83 | if err := ctx.Err(); err != nil { |
| 84 | return false, err |
| 85 | } |
| 86 | if projected[i].Role != provider.RoleTool { |
| 87 | continue |
| 88 | } |
| 89 | source := projected[i].Content |
| 90 | if projected[i].ProviderContent != "" { |
| 91 | source = projected[i].ProviderContent |
| 92 | } |
| 93 | if pruned, changed := pruneToolResultContent(source); changed { |
| 94 | projected[i].Content = pruned |
| 95 | projected[i].RawContent = "" |
| 96 | projected[i].ProviderContent = "" |
| 97 | affected++ |
| 98 | } |
| 99 | } |
| 100 | if affected == 0 { |
| 101 | return false, nil |
| 102 | } |
| 103 | return a.installMaintenanceProjection(ctx, maintenanceInstall{ |
| 104 | trigger: trigger, action: "prune", state: stateSnapshot, |
| 105 | canonical: canonical, transcriptVersion: transcriptVersion, |
| 106 | visible: visible, projected: projected, affected: affected, |
| 107 | }) |
| 108 | } |
| 109 | |
| 110 | type toolResultMaintenanceMode int |
| 111 | |
| 112 | const ( |
| 113 | toolResultSnip toolResultMaintenanceMode = iota |
| 114 | toolResultPrune |
| 115 | ) |
| 116 | |
| 117 | // PruneStats reports one maintenance pass. |
| 118 | type PruneStats struct { |
| 119 | Results int |
| 120 | SavedChars int |
| 121 | Archive string |
| 122 | Mode toolResultMaintenanceMode |
| 123 | InputHash string |
| 124 | Force bool |
| 125 | } |
| 126 | |
| 127 | // SnipStaleToolResults is a no-op: automatic prune/snip projections are gone. |
| 128 | func (a *Agent) SnipStaleToolResults() (PruneStats, error) { |
| 129 | return PruneStats{Mode: toolResultSnip}, nil |
| 130 | } |
| 131 | |
| 132 | // PruneStaleToolResults is a no-op: automatic prune/snip projections are gone. |
| 133 | func (a *Agent) PruneStaleToolResults() (PruneStats, error) { |
| 134 | return PruneStats{Mode: toolResultPrune}, nil |
| 135 | } |
| 136 | |
| 137 | type snipStrategy struct { |
| 138 | head int |
| 139 | tail int |
| 140 | headChars int |
| 141 | tailChars int |
| 142 | } |
| 143 | |
| 144 | var ( |
| 145 | defaultReadOnlySnip = snipStrategy{head: 80, tail: 12, headChars: 10000, tailChars: 2000} |
| 146 | defaultSideEffectingSnip = snipStrategy{head: 40, tail: 40, headChars: 8000, tailChars: 8000} |
| 147 | ) |
| 148 | |
| 149 | func (a *Agent) snipStrategyFor(name string) snipStrategy { |
| 150 | if a.svc.tools != nil { |
| 151 | if t, ok := a.svc.tools.Get(name); ok { |
| 152 | if h, ok := t.(tool.SnipHinter); ok { |
| 153 | return snipStrategyFromHint(h.SnipHint()) |
| 154 | } |
| 155 | if t.ReadOnly() { |
| 156 | return defaultReadOnlySnip |
| 157 | } |
| 158 | return defaultSideEffectingSnip |
| 159 | } |
| 160 | } |
| 161 | return defaultReadOnlySnip |
| 162 | } |
| 163 | |
| 164 | func snipStrategyFromHint(h tool.SnipHint) snipStrategy { |
| 165 | return snipStrategy{head: h.Head, tail: h.Tail, headChars: h.HeadChars, tailChars: h.TailChars} |
| 166 | } |
| 167 | |
| 168 | func minInt(a, b int) int { |
| 169 | if a < b { |
| 170 | return a |
| 171 | } |
| 172 | return b |
| 173 | } |
| 174 |