Open Files

Open the files changed in a given PR, branch, or commit using code (VS Code).

Step 1 — Resolve the target

Determine what git reference the user gave you:

• PR number (e.g. #123, 123): Get changed files with gh pr diff --name-only <number>
• Branch name (e.g. feat/my-feature): Get files changed relative to the merge base with git diff --name-only $(git merge-base HEAD <branch>) <branch>
• Commit hash or ref (e.g. abc1234, HEAD~2): Get files with git diff-tree --no-commit-id -r --name-only <ref>
• Current branch / "this PR": Run gh pr diff --name-only (no args) — falls back to git diff --name-only main...HEAD if no PR exists
• Vague reference (e.g. "these changes", "the current work"): Use the current branch against main: git diff --name-only main...HEAD

Deduplicate the file list. Before building the command, check each file exists on disk — deleted files will appear in git diffs but can't be opened. Use the Read tool to attempt reading each file; if it returns an error, the file doesn't exist — silently drop it. Only pass files that are actually present.