git diff --name-only && git status --short

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**If CHANGELOG is not updated, you must automatically perform the following (don't ask user to do it manually):**

1. **Analyze changes**: Run `git diff --stat` and `git diff` to get complete changes
2. **Auto-generate CHANGELOG entry**: Generate compliant entry based on code changes
3. **Write to CHANGELOG.md**: Use Edit tool to insert entry at top of `[Unreleased]` section
4. **Continue review flow**: Immediately proceed to next steps after CHANGELOG update

**Auto-generated CHANGELOG entry format:**

```markdown

**Example - Auto-generation Flow:**

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**If there are new files, automatically execute:**

```bash

**Explanation:**

- `-z` uses null character to separate filenames, correctly handles filenames with spaces/newlines
- `while IFS= read -r -d ''` reads filenames one by one
- `git add -- "$f"` uses `--` separator, correctly handles filenames starting with `-`
- When no new files exist, loop body doesn't execute, safely skipped
- This won't stage modified files, only handles new files
- codex needs files to be tracked by git for proper review

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**Difficulty Assessment Criteria:**

**Difficult Tasks** (meets any condition):

- Modified files ≥ 10
- Total code changes (insertions + deletions) ≥ 500 lines
- Single metric: insertions ≥ 300 lines OR deletions ≥ 300 lines
- Involves core architecture/algorithm changes
- Cross-module refactoring
- Config: `model_reasoning_effort=xhigh`, timeout 30 minutes

**Normal Tasks** (other cases):

- Config: `model_reasoning_effort=high`, timeout 10 minutes

**Evaluation Method:**

You MUST parse the `git diff --stat` output correctly to determine difficulty:

```bash

**Parsing Rules:**
1. Extract file count from "X file(s) changed" (handle both "1 file" and "N files")
2. Extract insertions from "Y insertion(s)(+)" if present (handle both "1 insertion" and "N insertions"), otherwise 0
3. Extract deletions from "Z deletion(s)(-)" if present (handle both "1 deletion" and "N deletions"), otherwise 0
4. Calculate total changes = insertions + deletions

**Important Edge Cases:**
- Single file: `"1 file changed"` (singular form)
- No insertions: Git omits `"insertions(+)"` entirely → treat as 0
- No deletions: Git omits `"deletions(-)"` entirely → treat as 0
- Pure rename: May show `"0 insertions(+), 0 deletions(-)"` or omit both

**Decision Logic (ANY condition triggers xhigh):**
- IF file_count >= 10 → xhigh
- IF total_changes >= 500 → xhigh
- IF insertions >= 300 → xhigh
- IF deletions >= 300 → xhigh
- ELSE → high

**Example Cases:**
- ✅ "20 files changed, 342 insertions(+), 985 deletions(-)" → xhigh (files=20≥10, total=1327≥500, deletions=985≥300)
- ✅ "5 files changed, 600 insertions(+), 50 deletions(-)" → xhigh (total=650≥500, insertions=600≥300)
- ✅ "12 files changed, 100 insertions(+), 50 deletions(-)" → xhigh (files=12≥10)
- ✅ "1 file changed, 400 deletions(-)" → xhigh (deletions=400≥300)
- ❌ "3 files changed, 150 insertions(+), 80 deletions(-)" → high (all conditions fail)
- ❌ "1 file changed, 50 insertions(+)" → high (no deletions, total=50<500)

**Invoke codex-runner Subtask:**

Use Task tool to invoke codex-runner, passing complete command (including Lint + codex review):

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codex review [OPTIONS] [PROMPT]

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