Read-only. Code ownership for a file via git blame, aggregated by author. Returns each author's line count, commit count, and most recent commit date, plus the primary_owner (most lines). Pass line_start/line_end to scope to one region (e.g. a single function). Errors if cwd is not a git repo or file is untracked. Cost scales with file size; instant for typical files.

Read-only. Find the pull request that introduced a line or a commit. First resolves the line to a commit via git blame, then reads the local merge-commit message; if that has no PR reference and GH_TOKEN/GITHUB_TOKEN is set, falls back to the GitHub REST API. Without a token the local path still works; pr is null when nothing can be resolved (e.g. rebase-merged with no PR ref). Provide either commit, or both file and line. May make one outbound GitHub API call (subject to the 5000/h authed rate limit).

Read-only. Files that historically change together with the input file — answers "if I edit X, what else should I check?". Mines up to window recent commits that touch file, counts how often each other file appears alongside it, and returns those above threshold, with the co-occurrence count and ratio (count / commits-touching-file), capped at limit. Pure local log mining; no network. Cost is O(window × files-per-commit) — keep window ≤ a few thousand on large repos.

Read-only. Inventory of branches with ahead/behind counts versus the default branch, last commit date and author, merged status, and a stale flag (no commits in stale_days days). Use it to find unmerged, abandoned branches. The default branch itself is excluded from the list. Pure local git; no network. Returns { count, branches, default_branch_excluded }.

Read-only. Standup / changelog helper: one author's commits in a time window with files touched and insertion/deletion totals. Defaults to the repo's user.name and the last 7 days. Pure local git; no network. Returns { author, since, commit_count, commits[] } where each commit has subject, date, files, insertions, deletions.

Read-only. Everything about one commit in a single call: subject, body, changed files with per-file insertions/deletions, totals, the linked PR (parsed from the merge message, or via the GitHub API when GH_TOKEN/GITHUB_TOKEN is set), and issue numbers referenced in the message (Fixes #N, Closes #N). Errors if the SHA does not resolve in cwd. May make one outbound GitHub API call for PR enrichment.