vscode: Skill for Claude Code

When asked to find all files a specific author contributed to on a branch (compared to main or another upstream), follow this procedure. The goal is to produce a simple table that both humans and LLMs can consume.

Run as a Subagent

This skill involves many sequential git commands. Delegate it to a subagent with a prompt like:

Find every file that author "Full Name" contributed to on branch <branch> compared to <upstream>. Trace contributions through file renames. Return a markdown table with columns: Status (DIRECT or VIA_RENAME), File Path, and Lines (+/-). Include a summary line at the end.

Procedure

1. Identify the author's exact git identity

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

Match the requested person to their exact --author= string. Do not guess — short usernames won't match full display names (resolve via git log or the GitHub MCP get_me tool).

2. Collect all files the author directly committed to

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

For each commit hash, extract touched files:

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

Union all results into a set (author_files).

3. Build rename map across the entire branch

For every commit on the branch (not just the author's), extract renames:

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

Parse lines with R status to build a map: new_path → {old_paths}.

4. Get the merge diff file list

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

These are the files that will actually land when the branch merges.

5. Classify each file in the merge diff

For each file in step 4:

• If it's in author_files → DIRECT
• Else, walk the rename map transitively (follow chains: current → old → older) and check if any ancestor is in author_files → VIA_RENAME
• Otherwise → not this author's contribution

6. Get diff stats

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