ldp-protocol 0.2.0

LDP — LLM Delegate Protocol: identity-aware communication for multi-agent LLM systems
Documentation 
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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161

"""Tests for LDP router."""

from ldp_protocol.router import LdpRouter, RoutingStrategy
from ldp_protocol.types import (
    LdpCapability,
    LdpIdentityCard,
    QualityMetrics,
    TrustDomain,
)


def _make_delegates() -> dict[str, LdpIdentityCard]:
    fast = LdpIdentityCard(
        delegate_id="ldp:delegate:fast",
        name="Fast Agent",
        model_family="gemini",
        model_version="gemini-flash",
        trust_domain=TrustDomain(name="research"),
        context_window=32000,
        cost_profile="low",
        endpoint="http://localhost:8091",
        capabilities=[
            LdpCapability(
                name="reasoning",
                quality=QualityMetrics(
                    quality_score=0.60,
                    cost_per_call_usd=0.001,
                    latency_p50_ms=200,
                ),
            ),
        ],
    )
    deep = LdpIdentityCard(
        delegate_id="ldp:delegate:deep",
        name="Deep Agent",
        model_family="claude",
        model_version="claude-opus",
        trust_domain=TrustDomain(name="research"),
        context_window=200000,
        cost_profile="high",
        endpoint="http://localhost:8092",
        capabilities=[
            LdpCapability(
                name="reasoning",
                quality=QualityMetrics(
                    quality_score=0.95,
                    cost_per_call_usd=0.025,
                    latency_p50_ms=3500,
                ),
            ),
        ],
    )
    external = LdpIdentityCard(
        delegate_id="ldp:delegate:external",
        name="External Agent",
        model_family="gpt",
        model_version="gpt-4o",
        trust_domain=TrustDomain(name="external"),
        context_window=128000,
        endpoint="http://localhost:8093",
        capabilities=[
            LdpCapability(
                name="reasoning",
                quality=QualityMetrics(
                    quality_score=0.88,
                    cost_per_call_usd=0.01,
                    latency_p50_ms=1000,
                ),
            ),
        ],
    )
    return {
        "http://localhost:8091": fast,
        "http://localhost:8092": deep,
        "http://localhost:8093": external,
    }


class TestRouter:
    def _make_router(self) -> LdpRouter:
        router = LdpRouter()
        router.delegates = _make_delegates()
        return router

    def test_select_by_quality(self):
        router = self._make_router()
        best = router.select("reasoning", RoutingStrategy.QUALITY)
        assert best is not None
        assert best.delegate_id == "ldp:delegate:deep"

    def test_select_by_cost(self):
        router = self._make_router()
        best = router.select("reasoning", RoutingStrategy.COST)
        assert best is not None
        assert best.delegate_id == "ldp:delegate:fast"

    def test_select_by_latency(self):
        router = self._make_router()
        best = router.select("reasoning", RoutingStrategy.LATENCY)
        assert best is not None
        assert best.delegate_id == "ldp:delegate:fast"

    def test_select_balanced(self):
        router = self._make_router()
        best = router.select("reasoning", RoutingStrategy.BALANCED)
        assert best is not None
        # Balanced should favor high quality/cost ratio — fast or external
        assert best.delegate_id in ("ldp:delegate:fast", "ldp:delegate:external")

    def test_select_with_trust_domain(self):
        router = self._make_router()
        best = router.select("reasoning", RoutingStrategy.QUALITY, trust_domain="research")
        assert best is not None
        assert best.delegate_id == "ldp:delegate:deep"
        assert best.trust_domain.name == "research"

    def test_select_nonexistent_skill(self):
        router = self._make_router()
        best = router.select("cooking", RoutingStrategy.QUALITY)
        assert best is None

    def test_select_nonexistent_trust_domain(self):
        router = self._make_router()
        best = router.select("reasoning", RoutingStrategy.QUALITY, trust_domain="secret")
        assert best is None

    def test_list_delegates(self):
        router = self._make_router()
        delegates = router.list_delegates()
        assert len(delegates) == 3

    def test_list_delegates_filtered(self):
        router = self._make_router()
        delegates = router.list_delegates(skill="reasoning")
        assert len(delegates) == 3
        delegates = router.list_delegates(skill="cooking")
        assert len(delegates) == 0


class TestRouterEdgeCases:
    def _make_router(self) -> LdpRouter:
        router = LdpRouter()
        router.delegates = _make_delegates()
        return router

    def test_select_balanced_picks_best_ratio(self):
        router = self._make_router()
        best = router.select("reasoning", RoutingStrategy.BALANCED)
        assert best is not None
        assert best.delegate_id == "ldp:delegate:fast"

    def test_list_delegates_includes_quality_scores(self):
        router = self._make_router()
        delegates = router.list_delegates(skill="reasoning")
        for d in delegates:
            assert "quality_scores" in d
            assert "reasoning" in d["quality_scores"]

    def test_select_empty_delegates(self):
        router = LdpRouter()
        assert router.select("anything") is None