---
phase: 09-unsupported-command-handling
verified: 2026-01-18T23:30:00Z
status: passed
score: 4/4 must-haves verified
---

# Phase 9: Unsupported Command Handling Verification Report

**Phase Goal:** Gracefully handle commands we cannot translate
**Verified:** 2026-01-18T23:30:00Z
**Status:** passed
**Re-verification:** No -- initial verification

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | Unsupported commands print informative message to stderr | VERIFIED | `gitsl.py:87` prints to `file=sys.stderr`, output confirmed: `gitsl: unsupported command: git push origin main` |
| 2 | Unsupported commands exit with code 0 | VERIFIED | `gitsl.py:88` returns 0, confirmed via `echo $?` test |
| 3 | Unsupported commands produce empty stdout | VERIFIED | `gitsl push 2>/dev/null` produces no output |
| 4 | Message includes the full original git command with arguments | VERIFIED | `shlex.join(parsed.args)` at line 83 reconstructs full command, e.g., "git push origin main" |

**Score:** 4/4 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `gitsl.py` | Unsupported command fallback handler | VERIFIED | Lines 81-88 implement handler with "unsupported command" message |
| `tests/test_unsupported.py` | E2E tests (min 30 lines) | VERIFIED | 50 lines, 7 tests covering push/rebase/fetch/checkout |

### Key Link Verification

| From | To | Via | Status | Details |
|------|-----|-----|--------|---------|
| `gitsl.py` | `shlex.join` | command reconstruction | WIRED | Line 83: `shlex.join(parsed.args)` |
| `tests/test_unsupported.py` | `conftest.run_gitsl` | test helper import | WIRED | Line 7: `from conftest import run_gitsl`, used 7 times |

### Requirements Coverage

| Requirement | Status | Blocking Issue |
|-------------|--------|----------------|
| UNSUP-01: Unsupported commands print original command to stderr | SATISFIED | None |
| UNSUP-02: Unsupported commands exit with code 0 | SATISFIED | None |

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| (none) | - | - | - | - |

No TODO, FIXME, STUB, placeholder, or other anti-patterns found in modified files.

### Test Results

**Full test suite:** 91/91 passed (59.33s)
**Phase-specific tests:** 7/7 passed

Tests cover:
- `test_push_exits_zero` - UNSUP-02 verification
- `test_push_message_on_stderr` - UNSUP-01 verification
- `test_push_with_args_includes_full_command` - Full command reconstruction
- `test_push_stdout_empty` - Clean stdout for tool compatibility
- `test_rebase_unsupported` - Additional unsupported command
- `test_fetch_unsupported` - Additional unsupported command with flags
- `test_checkout_unsupported` - Additional unsupported command with multiple args

### Human Verification Required

None -- all success criteria are programmatically verifiable.

### Verification Summary

Phase 9 has been fully implemented as planned. The `[STUB]` fallback message has been replaced with a proper user-friendly message format (`gitsl: unsupported command: {original_command}`). The implementation:

1. Uses `shlex.join()` for safe argument quoting in messages
2. Prints to stderr only (keeps stdout empty)
3. Returns exit code 0 per UNSUP-02 to not break calling tools
4. Includes full command with arguments in message per UNSUP-01

All 91 tests pass with no regressions. This is the final phase of the GitSL project.

---

*Verified: 2026-01-18T23:30:00Z*
*Verifier: Claude*
