| 1 | package agent |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "strings" |
| 7 | |
| 8 | "reasonix/internal/event" |
| 9 | "reasonix/internal/i18n" |
| 10 | "reasonix/internal/provider" |
| 11 | "reasonix/internal/tool" |
| 12 | ) |
| 13 | |
| 14 | // landCause is why a turn was told to finalize. kind selects the pause the Run |
| 15 | // ends with, so a host can tell "spent its budget" from "hit the round assert". |
| 16 | type landCause struct { |
| 17 | kind string |
| 18 | axis string |
| 19 | detail string |
| 20 | } |
| 21 | |
| 22 | // turnFinalizer is implemented only by host-consumed terminal tools owned by |
| 23 | // this package. A successful finalizer carries the turn's result as structured |
| 24 | // data, so no provider-generated prose acknowledgement is needed afterwards. |
| 25 | type turnFinalizer interface { |
| 26 | finalizesTurn() |
| 27 | } |
| 28 | |
| 29 | func (a *Agent) providerToolSchemas() []provider.ToolSchema { |
| 30 | if a == nil || a.svc.tools == nil || !provider.SupportsTools(a.svc.prov) { |
| 31 | return []provider.ToolSchema{} |
| 32 | } |
| 33 | schemas := a.svc.tools.Schemas() |
| 34 | visible := schemas[:0] |
| 35 | for _, schema := range schemas { |
| 36 | if !retiredTool(schema.Name) { |
| 37 | visible = append(visible, schema) |
| 38 | } |
| 39 | } |
| 40 | schemas = visible |
| 41 | if !provider.NativeToolSearchEnabled(a.svc.prov) { |
| 42 | return schemas |
| 43 | } |
| 44 | return provider.ApplyNativeToolSearch(schemas, deferredMCPSchemas(a.svc.tools), a.svc.prov) |
| 45 | } |
| 46 | |
| 47 | func deferredMCPSchemas(reg *tool.Registry) []provider.ToolSchema { |
| 48 | if reg == nil { |
| 49 | return nil |
| 50 | } |
| 51 | var extra []provider.ToolSchema |
| 52 | for _, name := range reg.AllNames() { |
| 53 | if retiredTool(name) { |
| 54 | continue |
| 55 | } |
| 56 | if !strings.HasPrefix(name, "mcp__") { |
| 57 | continue |
| 58 | } |
| 59 | if reg.ProviderVisible(name) { |
| 60 | continue |
| 61 | } |
| 62 | target, ok := reg.Get(name) |
| 63 | if !ok { |
| 64 | continue |
| 65 | } |
| 66 | extra = append(extra, provider.ToolSchema{ |
| 67 | Name: target.Name(), |
| 68 | Description: target.Description(), |
| 69 | Parameters: target.Schema(), |
| 70 | }) |
| 71 | } |
| 72 | return extra |
| 73 | } |
| 74 | |
| 75 | func (a *Agent) singleTurnFinalizer(calls []provider.ToolCall) bool { |
| 76 | if a == nil || a.svc.tools == nil || len(calls) != 1 { |
| 77 | return false |
| 78 | } |
| 79 | t, _, ambiguous := a.svc.tools.ResolveCall(calls[0].Name) |
| 80 | if t == nil || len(ambiguous) > 0 { |
| 81 | return false |
| 82 | } |
| 83 | _, ok := t.(turnFinalizer) |
| 84 | return ok |
| 85 | } |
| 86 | |
| 87 | func (a *Agent) allowsBoundaryTurnFinalizer(ctx context.Context, state *turnRuntime, calls []provider.ToolCall) bool { |
| 88 | if state == nil || !state.graceRound || !a.singleTurnFinalizer(calls) { |
| 89 | return false |
| 90 | } |
| 91 | _, ok := planSubmissionFromContext(ctx) |
| 92 | return ok |
| 93 | } |
| 94 | |
| 95 | func (a *Agent) successfulTurnFinalizer(ctx context.Context, calls []provider.ToolCall, batch batchExecution) bool { |
| 96 | if !a.singleTurnFinalizer(calls) || len(batch.outcomes) != 1 { |
| 97 | return false |
| 98 | } |
| 99 | outcome := batch.outcomes[0] |
| 100 | if outcome.errMsg != "" || outcome.blocked { |
| 101 | return false |
| 102 | } |
| 103 | submission, ok := planSubmissionFromContext(ctx) |
| 104 | if !ok { |
| 105 | return false |
| 106 | } |
| 107 | _, submitted := submission.Plan() |
| 108 | return submitted |
| 109 | } |
| 110 | |
| 111 | func (c landCause) nudge(state *turnRuntime, submitPlan bool) string { |
| 112 | close := "Do not call any more tools. Synthesize a final answer from the work already completed: what was accomplished, what remains, and any decision the user should make." |
| 113 | if submitPlan { |
| 114 | close = "Do not call any more research tools. Synthesize the evidence already collected into the best executor-ready plan you can, label remaining uncertainty, and call submit_plan now." |
| 115 | } |
| 116 | if c.kind == "task_budget" { |
| 117 | return fmt.Sprintf("This task has reached its %s budget. %s Use the evidence already collected and label what is still uncertain; the user can continue in the next message.", c.axis, close) |
| 118 | } |
| 119 | tail := fmt.Sprintf("The user can increase %s or continue in the next turn if more work is needed.", state.runMaxStepsKey) |
| 120 | return fmt.Sprintf("Your tool-call round limit (%s) has been reached. %s %s", state.runMaxStepsKey, close, tail) |
| 121 | } |
| 122 | |
| 123 | func (c landCause) noticeText() string { |
| 124 | if c.kind == "task_budget" { |
| 125 | return i18n.M.TaskBudget |
| 126 | } |
| 127 | return toolBudgetNoticeText() |
| 128 | } |
| 129 | |
| 130 | // armFinalizationRound is the single place a turn is told to stop using tools. |
| 131 | // The grace round it sets — not the wording — is what enforces that: research |
| 132 | // calls in the next round are paired and refused by stopUnexecutedBoundaryCalls; |
| 133 | // a host-consumed structured finalizer is the only exception. |
| 134 | func (a *Agent) armFinalizationRound(ctx context.Context, state *turnRuntime, cause landCause) error { |
| 135 | if state.graceRound { |
| 136 | return nil |
| 137 | } |
| 138 | state.graceRound = true |
| 139 | state.landCause = cause |
| 140 | _, canSubmitPlan := planSubmissionFromContext(ctx) |
| 141 | if err := a.appendCommittedMessages(ctx, "finalization-nudge", HostGeneratedUserMessage(a.withTurnPreferences(cause.nudge(state, canSubmitPlan)))); err != nil { |
| 142 | return err |
| 143 | } |
| 144 | a.svc.sink.Emit(event.Event{Kind: event.Notice, Level: event.LevelInfo, Code: event.NoticeCodeToolBudget, |
| 145 | Text: cause.noticeText(), Detail: cause.detail}) |
| 146 | return nil |
| 147 | } |
| 148 | |
| 149 | // gracePause is the resumable stop a finalized turn ends with, chosen by what |
| 150 | // caused the landing. |
| 151 | func (a *Agent) gracePause(state *turnRuntime) error { |
| 152 | if state.landCause.kind == "task_budget" { |
| 153 | return &taskBudgetPause{axis: state.landCause.axis, detail: state.landCause.detail} |
| 154 | } |
| 155 | return &maxStepsPause{steps: state.runMaxSteps, key: state.runMaxStepsKey} |
| 156 | } |
| 157 | |
| 158 | // taskBudgetPause ends a Run that spent its task budget. The work is saved and |
| 159 | // the next message continues it — with a fresh budget, because the user |
| 160 | // deciding to continue is the approval that a round counter cannot ask for. |
| 161 | type taskBudgetPause struct { |
| 162 | axis string |
| 163 | detail string |
| 164 | } |
| 165 | |
| 166 | func (e *taskBudgetPause) Error() string { |
| 167 | return fmt.Sprintf("paused after reaching this task's %s budget (%s) — the work so far is saved; send another message to continue", e.axis, e.detail) |
| 168 | } |
| 169 |