a3s 0.8.2

a3s — A3S coding agent CLI; `a3s code` launches the interactive TUI
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

//! Deterministic convergence policy for DeepResearch.
//!
//! The model and workflow collect evidence; this policy alone decides whether
//! another collection round is justified. Keeping the decision typed and pure
//! makes every stop/continue result replayable and testable.

use serde::{Deserialize, Serialize};

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub(crate) struct ConvergenceInput {
    pub(crate) accepted_evidence: usize,
    pub(crate) traceable_sources: usize,
    pub(crate) authoritative_sources: usize,
    pub(crate) unresolved_contradictions: usize,
    pub(crate) unresolved_gaps: usize,
    pub(crate) completed_rounds: usize,
    pub(crate) max_rounds: usize,
    pub(crate) rounds_without_material_gain: usize,
    pub(crate) remaining_ms: u64,
    pub(crate) finalization_reserve_ms: u64,
    pub(crate) evidence_package_complete: bool,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub(crate) enum ConvergenceAction {
    Continue,
    Finalize,
    Degrade,
}

#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub(crate) struct ConvergenceDecision {
    pub(crate) action: ConvergenceAction,
    pub(crate) reason: String,
    pub(crate) input: ConvergenceInput,
}

pub(crate) fn evaluate_convergence(input: ConvergenceInput) -> ConvergenceDecision {
    let (action, reason) =
        if input.evidence_package_complete && input.unresolved_contradictions == 0 {
            (
                ConvergenceAction::Finalize,
                "validated evidence package satisfies the completion gate",
            )
        } else if input.remaining_ms <= input.finalization_reserve_ms {
            (
                ConvergenceAction::Degrade,
                "finalization reserve reached; retrieval must stop",
            )
        } else if input.completed_rounds >= input.max_rounds.max(1) {
            (
                ConvergenceAction::Degrade,
                "bounded research round limit reached",
            )
        } else if input.rounds_without_material_gain >= 2 {
            (
                ConvergenceAction::Degrade,
                "two consecutive rounds produced no material evidence gain",
            )
        } else if input.accepted_evidence == 0 && input.completed_rounds > 0 {
            (
                ConvergenceAction::Degrade,
                "completed retrieval produced no accepted evidence",
            )
        } else {
            (
                ConvergenceAction::Continue,
                "material evidence gaps remain within the retrieval budget",
            )
        };
    ConvergenceDecision {
        action,
        reason: reason.to_string(),
        input,
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn input() -> ConvergenceInput {
        ConvergenceInput {
            accepted_evidence: 3,
            traceable_sources: 2,
            authoritative_sources: 1,
            unresolved_contradictions: 0,
            unresolved_gaps: 1,
            completed_rounds: 1,
            max_rounds: 3,
            rounds_without_material_gain: 0,
            remaining_ms: 60_000,
            finalization_reserve_ms: 10_000,
            evidence_package_complete: false,
        }
    }

    #[test]
    fn complete_package_finalizes_without_an_extra_round() {
        let mut state = input();
        state.evidence_package_complete = true;
        assert_eq!(
            evaluate_convergence(state).action,
            ConvergenceAction::Finalize
        );
    }

    #[test]
    fn finalization_reserve_preempts_more_retrieval() {
        let mut state = input();
        state.remaining_ms = state.finalization_reserve_ms;
        assert_eq!(
            evaluate_convergence(state).action,
            ConvergenceAction::Degrade
        );
    }

    #[test]
    fn repeated_no_gain_stops_deterministically() {
        let mut state = input();
        state.rounds_without_material_gain = 2;
        assert_eq!(
            evaluate_convergence(state).action,
            ConvergenceAction::Degrade
        );
    }

    #[test]
    fn unresolved_material_gap_can_continue_within_budget() {
        assert_eq!(
            evaluate_convergence(input()).action,
            ConvergenceAction::Continue
        );
    }
}