Author Contributions Agent Skill

git log --format="%an <%ae>" <upstream>..<branch> | sort -u

git log --author="<Exact Name>" --format="%H" <upstream>..<branch>

git diff-tree --no-commit-id --name-only -r <hash>

git diff-tree --no-commit-id -r -M <hash>

git diff --name-only <upstream>..<branch>

git diff --stat <upstream>..<branch> -- <file1> <file2> ...

| Status | File | +/- |
|--------|------|-----|
| DIRECT | src/vs/foo/bar.ts | +120/-5 |
| VIA_RENAME | src/vs/baz/qux.ts | +300 |
| ... | ... | ... |

**Total: N files, +X/-Y lines**

import subprocess, os

os.chdir('<repo_root>')
UPSTREAM = 'main'
AUTHOR = '<Author Name>'  # Resolve via `git log` or GitHub MCP `get_me`

# Step 2: author's files
commits = subprocess.check_output(
    ['git', 'log', f'--author={AUTHOR}', '--format=%H', f'{UPSTREAM}..HEAD'],
    text=True).strip().split('\n')
author_files = set()
for h in (c for c in commits if c):
    files = subprocess.check_output(
        ['git', 'diff-tree', '--no-commit-id', '--name-only', '-r', h],
        text=True).strip().split('\n')
    author_files.update(f for f in files if f)

# Step 3: rename map from ALL commits
all_commits = subprocess.check_output(
    ['git', 'log', '--format=%H', f'{UPSTREAM}..HEAD'],
    text=True).strip().split('\n')
rename_map = {}  # new_name -> set(old_names)
for h in (c for c in all_commits if c):
    out = subprocess.check_output(
        ['git', 'diff-tree', '--no-commit-id', '-r', '-M', h],
        text=True, timeout=5).strip()
    for line in out.split('\n'):
        if not line:
            continue
        parts = line.split('\t')
        if len(parts) >= 3 and 'R' in parts[0]:
            rename_map.setdefault(parts[2], set()).add(parts[1])

# Step 4: merge diff
diff_files = subprocess.check_output(
    ['git', 'diff', '--name-only', f'{UPSTREAM}..HEAD'],
    text=True).strip().split('\n')

# Step 5: classify
results = []
for f in (x for x in diff_files if x):
    if f in author_files:
        results.append(('DIRECT', f))
    else:
        # walk rename chain
        chain, to_check = set(), [f]
        while to_check:
            cur = to_check.pop()
            if cur in chain:
                continue
            chain.add(cur)
            to_check.extend(rename_map.get(cur, []))
        chain.discard(f)
        if chain & author_files:
            results.append(('VIA_RENAME', f))

# Step 6: stats
if results:
    stat = subprocess.check_output(
        ['git', 'diff', '--stat', f'{UPSTREAM}..HEAD', '--'] +
        [f for _, f in results], text=True)
    print(stat)

# Step 7: table
for kind, f in sorted(results, key=lambda x: x[1]):
    print(f'| {kind:12s} | {f} |')
print(f'\nTotal: {len(results)} files')

AUTHOR=""

# 1. Find commits by author on this branch (not on main)
git log main...HEAD --author="$AUTHOR" --format="%H"

# 2. Get unique files touched across all those commits, excluding src/vs/sessions/
git log main...HEAD --author="$AUTHOR" --format="%H" \
  | xargs -I{} git diff-tree --no-commit-id -r --name-only {} \
  | sort -u \
  | grep -v '^src/vs/sessions/'

# 3. Cross-reference with branch diff to keep only files still changed vs main
git log main...HEAD --author="$AUTHOR" --format="%H" \
  | xargs -I{} git diff-tree --no-commit-id -r --name-only {} \
  | sort -u \
  | grep -v '^src/vs/sessions/' \
  | while read f; do git diff main...HEAD --name-only -- "$f" 2>/dev/null; done \
  | sort -u