### expert_build/llm.py
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: The implementation of cost tracking is robust and includes graceful fallbacks for non-JSON output, ensuring backward compatibility with existing tests and resilience to CLI glitches. The logic for parsing Gemini and Claude specific JSON structures is clear and handles multi-model responses (for Gemini) and cache tokens (for Claude) correctly.
---

### expert_build/cli.py
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: UNTESTED
INTEGRATION: WIRED
REASONING: The addition of the `finally` block in `main` ensures that cost metrics are displayed regardless of the success or failure of the command. Printing to `stderr` is appropriate to avoid interfering with command output that might be redirected to files or pipes.
---

### tests/test_llm.py
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: Comprehensive test suite for the new cost tracking and JSON parsing logic. It covers multiple models, edge cases (non-JSON, non-dict), and stat accumulation. The use of a fixture to reset the tracker ensures test isolation.
---

### SELF_REVIEW
LIMITATIONS: I assumed the JSON output formats for the `claude` and `gemini` CLIs based on the implementation as no specification for those external tools was provided. However, the fallback logic in `_parse_cli_json` makes this safe even if the external format changes. Existing tests patch `invoke_sync` directly, so they are not impacted by the change in the internal `invoke` logic.
---
