{
  "intent": "Bring code_tutor/_llm.py under the 250-line cap by moving the Anthropic-API backend into its own module, clearing the last code_tutor source violation.",
  "scope": [
    "python_pkg/code_tutor/_claude_backend.py (new)",
    "python_pkg/code_tutor/_llm.py (295 -> 217)",
    "python_pkg/code_tutor/tests/test_llm.py (import and patch paths only)",
    "Non-goal: no assertion changed, no test deleted, skipped or weakened"
  ],
  "changes": [
    "Moved ClaudeBackend into _claude_backend.py. The seam falls between the two backends precisely because each pins a different plain import: test_llm.py patches requests.post on _llm for OllamaBackend and anthropic.Anthropic for ClaudeBackend, so separating the classes separates the two pinned modules cleanly.",
    "_llm.py keeps its anthropic import, because complete_with_fallback still catches anthropic.APIError, and imports ClaudeBackend back since it constructs one.",
    "Repointed the four anthropic patch strings belonging to the ClaudeBackend tests. The two in complete_with_fallback tests stay on _llm, since that is the module whose globals the except clause resolves through."
  ],
  "verification": [
    {
      "command": "timeout 90 env PYTHONPATH=. python3 -m pytest python_pkg/code_tutor/tests -q",
      "result": "pass",
      "evidence": "217 passed - unchanged from the count established by the previous commit."
    },
    {
      "command": "PYTHONPATH=. python3 -c \"from python_pkg.code_tutor import _llm as l, _claude_backend as c; l.requests; l.anthropic; l.ClaudeBackend; l.OllamaBackend; c.anthropic; c.ClaudeBackend\"",
      "result": "pass",
      "evidence": "resolve OK - anthropic is a real attribute of both modules, which is what makes the per-test split of its patch strings valid."
    },
    {
      "command": "bash ~/utils/scripts/check_file_length.sh --all | grep code_tutor",
      "result": "pass",
      "evidence": "Only test modules are listed now: every code_tutor source file is under the 250-line cap."
    },
    {
      "command": "pre-commit run --files <the touched files and artifacts>",
      "result": "pass",
      "evidence": "ruff flagged E501 on a patch string the longer module name pushed past 88 columns; auto-formatted, then clean. pytest-with-coverage passes at 100%."
    }
  ],
  "risks": [
    "anthropic is now imported by two modules and patched on both, for different reasons. A future change that stops complete_with_fallback catching APIError would make the _llm import unused, and ruff would strip it and break the two patches that remain there.",
    "_llm imports ClaudeBackend from _claude_backend; the reverse import would be a cycle."
  ],
  "rollback": [
    "git revert the commit; _llm.py returns to 295 lines and _claude_backend.py disappears.",
    "After rollback, re-run the package suite and confirm it still reports 217 passed."
  ]
}