skill-evolution: host-agnostic skill self-improvement pipeline

Standalone Python stdlib pipeline that reads an agent's past sessions,
compares them against installed skills, and generates structured
improvement proposals gated by an evaluation framework before anything
mutates. Host-agnostic via HostAdapter (Hermes, Claude Code).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/test_evaluate_analyzer_prompt_target.py

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+"""Tests for scripts/evaluate.py's evaluate_analyzer_prompt() target (U3, R5)."""
+
+import os
+import sys
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "scripts"))
+
+import pytest
+
+import evaluate
+from evaluate import EvalResult, evaluate_analyzer_prompt
+
+
+@pytest.fixture(autouse=True)
+def stub_run_evaluators(monkeypatch):
+    captured = {}
+
+    def fake_run_evaluators(content, target, context=None):
+        captured["content"] = content
+        captured["target"] = target
+        captured["context"] = context or {}
+        return [EvalResult(score=0.9, passed=True, feedback="ok", evaluator_name="stub")]
+
+    monkeypatch.setattr(evaluate, "run_evaluators", fake_run_evaluators)
+    return captured
+
+
+@pytest.fixture
+def stub_fetch_session_messages(monkeypatch):
+    def _stub(messages):
+        monkeypatch.setattr(evaluate, "_fetch_session_messages", lambda session_id: messages)
+    return _stub
+
+
+@pytest.fixture
+def stub_fetch_proposal_markdown(monkeypatch):
+    def _stub(markdown):
+        monkeypatch.setattr(evaluate, "_fetch_proposal_markdown", lambda proposal_id: markdown)
+    return _stub
+
+
+def test_evaluate_analyzer_prompt_combines_session_and_proposal(
+    stub_run_evaluators, stub_fetch_session_messages, stub_fetch_proposal_markdown
+):
+    stub_fetch_session_messages([
+        {"role": "user", "content": "Fix the bug in login"},
+        {"role": "assistant", "content": "I'll investigate the issue."},
+    ])
+    stub_fetch_proposal_markdown("# Proposal\n\nImprove login error handling.")
+
+    results = evaluate_analyzer_prompt("session-123", "proposal-456")
+
+    assert stub_run_evaluators["target"] == "analyzer_prompt:session-123"
+    assert "[SESSION MESSAGES]" in stub_run_evaluators["content"]
+    assert "[PROPOSAL]" in stub_run_evaluators["content"]
+    assert "Fix the bug" in stub_run_evaluators["content"]
+    assert "Improve login" in stub_run_evaluators["content"]
+    assert results[0].passed is True
+
+
+def test_evaluate_analyzer_prompt_truncates_long_messages(
+    stub_run_evaluators, stub_fetch_session_messages, stub_fetch_proposal_markdown
+):
+    long_content = "x" * 500
+    stub_fetch_session_messages([
+        {"role": "user", "content": long_content},
+    ])
+    stub_fetch_proposal_markdown("# Proposal")
+
+    evaluate_analyzer_prompt("session-123", "proposal-456")
+
+    # Content should be truncated to 300 chars + "..."
+    assert "x" * 300 in stub_run_evaluators["content"]
+    assert "..." in stub_run_evaluators["content"]
+
+
+def test_evaluate_analyzer_prompt_handles_missing_proposal(
+    stub_run_evaluators, stub_fetch_session_messages, stub_fetch_proposal_markdown
+):
+    stub_fetch_session_messages([
+        {"role": "user", "content": "test"},
+    ])
+    stub_fetch_proposal_markdown(None)
+
+    results = evaluate_analyzer_prompt("session-123", "proposal-456")
+
+    assert "(proposal not found)" in stub_run_evaluators["content"]
+    assert results[0].passed is True
+
+
+def test_evaluate_analyzer_prompt_handles_no_messages(
+    stub_run_evaluators, stub_fetch_session_messages, stub_fetch_proposal_markdown
+):
+    stub_fetch_session_messages([])
+    stub_fetch_proposal_markdown("# Proposal")
+
+    results = evaluate_analyzer_prompt("session-123", "proposal-456")
+
+    assert "(no messages)" in stub_run_evaluators["content"]
+    assert results[0].passed is True
+
+
+def test_evaluate_analyzer_prompt_does_not_modify_evaluate_skill_text(
+    stub_run_evaluators, stub_fetch_session_messages, stub_fetch_proposal_markdown
+):
+    """KTD1: evaluate_analyzer_prompt is a sibling, not a branch in evaluate_skill_text."""
+    stub_fetch_session_messages([{"role": "user", "content": "test"}])
+    stub_fetch_proposal_markdown("# Proposal")
+
+    evaluate_analyzer_prompt("session-123", "proposal-456")
+    assert stub_run_evaluators["target"].startswith("analyzer_prompt:")