Oma Scm

Software configuration management: SCM (oma-scm)

Scheduling

Goal

Manage Git and software configuration management safely: commits, branches, merges, worktrees, releases, baselines, audit posture, CODEOWNERS, and Conventional Commits.

Intent signature

• User asks to commit, stage, branch, merge, rebase, cherry-pick, tag, release, resolve conflicts, manage worktrees, inspect SCM posture, or apply Conventional Commits.
• User needs safe Git operations with explicit file staging, secret awareness, and CM governance.

This skill is the single place for configuration management (CM) on a software repo and for Conventional Commits / safe staging.

When to use

• Commits: “commit this”, /scm, message type/scope, splitting staged changes into multiple commits.
• CM / Git: branching (gitflow, GitHub Flow, GitLab Flow, trunk-based), protected branches, merge queue, merge conflicts, rebase, cherry-pick, worktrees, submodules/subtrees, tags and releases.
• Governance: issue/ADR links, breaking-change footers, changelog or release-tool alignment.
• Audit posture: signed commits, CI before merge, secret-sensitive paths.

When NOT to use

• Implementing product or application code -> use the relevant domain skill
• Debugging runtime failures without a Git or CM operation -> use oma-debug
• Security, performance, or accessibility review -> use oma-qa
• Planning feature requirements or decomposing work -> use oma-pm

Expected inputs

• Git task, desired branch/commit/release operation, and affected files
• Current worktree status, staged diff, branch tracking, config files, and governance constraints
• Optional issue/ADR/PR/release context

Expected outputs

• Safe commit, branch, merge/rebase guidance, conflict plan, status accounting, or CM audit findings
• Conventional Commit message and explicit staged paths when committing
• Risk notes for shared history, secrets, CODEOWNERS, CI, and release evidence

Dependencies

• Git CLI and repository metadata
• .agents/oma-config.yaml, Conventional Commit references, onboarding-risk and CODEOWNERS playbooks

Control-flow features

• Branches by quick commit path versus full CM/governance path
• Reads Git state and diffs; may write commits, branches, tags, or conflict resolutions
• Requires explicit approval for broad staging, shared-history rewrite, production-destructive operations, or secret-risk paths

Structural Flow

Entry

1. Inspect Git status, branch, staged/unstaged changes, and user intent.
2. Choose Quick Path for ordinary commits or Full CM Path for governance/risky history work.
3. Read commit and CM config before enforcing project-specific rules.

Scenes

1. PREPARE: Determine operation type, risk, and affected files.
2. ACQUIRE: Read status, diff, logs, config, ownership, and release context.
3. REASON: Split changes, choose message/scope, identify CM controls and risks.
4. ACT: Stage explicit paths, commit, branch, resolve, or provide CM action plan.
5. VERIFY: Check status, staged diff, CI expectations, signatures, secrets, and audit evidence.
6. FINALIZE: Report operation result and remaining SCM tasks.

Transitions

• If user intent is commit-only, follow Quick Path and stop after safe commit.
• If branching/history/release/governance is involved, run Full CM Path.
• If shared history rewrite is requested, require maintainer approval.
• If changes span independent features, split commits unless user requests one commit.

Failure and recovery

• If worktree is dirty in unrelated files, avoid touching unrelated changes.
• If conflicts exist, resolve markers, test, and preserve target-branch context.
• If secrets are detected or suspected, stop before staging/committing.

Exit

• Success: requested SCM operation is complete or a safe, auditable plan is delivered.
• Partial success: blockers such as conflicts, missing approval, CI, or secret risk are explicit.

Logical Operations

Actions

Tools and instruments

• Git CLI and repository metadata
• Commit/CM config, Conventional Commit guide, CODEOWNERS playbook, onboarding-risk signals

Canonical command path

git status -sb
git diff --staged
git log --oneline -5

Stage and commit only explicit paths:

git add <specific-files>
git commit -m "$(cat <<'EOF'
<type>(<scope>): <description>

[optional body]

Co-Authored-By: First Fluke <our.first.fluke@gmail.com>
EOF
)"

Copy the co-author address, never recall it. Read it from scm.co_author in .agents/oma-config.yaml rather than from memory. GitHub matches a Co-authored-by: address against verified account emails and credits whoever owns it as a contributor, so a one-character slip attributes the work to a real, unrelated person — and refs/pull/* keeps the commit reachable permanently, so rewriting history does not undo it. A commit-msg hook at .githooks/commit-msg enforces this; a rejected commit means the address is wrong, not that the hook is.

Resource scope

Preconditions

• Repository and Git intent are identifiable.
• User has authorized the requested SCM operation.

Effects and side effects

• May stage files, create commits, branches, tags, worktrees, or history operations.
• Can affect shared repository history if unsafe commands are used, so approvals matter.

Guardrails

0. Explicit user override (highest priority). When the user gives an explicit, unambiguous instruction on how to perform a Git/SCM operation, follow it exactly and do not argue, re-litigate, or block on the conditions below. This overrides every default and guardrail in this skill — including "no direct push to main/protected branches", broad staging, the commit-split rules, single vs. multiple commits, message type/scope/length, and shared-history rewrite. State briefly what you are doing and proceed; do not ask for re-confirmation of an instruction the user already gave. Only confirm if the instruction is genuinely ambiguous (multiple plausible interpretations) — never as a way to push back on a clear directive.
   • Single hard exception: likely-secret material (.env, keys, raw tokens). If the user's instruction would stage/commit such material, surface it once before proceeding; everything else proceeds without challenge.
1. Choose Quick Path for ordinary commits and Full CM Path for branching, history, release, or governance work.
2. Read .agents/oma-config.yaml before applying project-specific commit or CM rules.
3. Stage only explicit files; never use broad staging unless the user explicitly approves it.
4. Do not rewrite shared history without maintainer approval.
5. Never stage or commit likely-secret material.
6. Response language follows oma-config.yaml language: user-facing SCM output (status summaries, conflict explanations, CM audit notes, action plans) is localized. Per i18n-guide.md, commit messages, PR titles/body, branch names, and status keywords stay in English regardless of the setting.

Configuration

Operating mode (choose first)

Quick Path (commit-focused, default)

Use this when the user intent is mainly "commit this safely."

1. Follow Conventional Commits section only
2. Stage explicit files only
3. Validate message type/scope/length from commit-config.yaml
4. Stop after safe commit unless user asks CM/governance operations

Full CM Path (repo governance / risky history operations)

Use this when the user asks about branching strategy, merges, rebase/cherry-pick, worktrees, release refs, CODEOWNERS, or audit posture.

1. Run CM workflows in order (Planning -> Identification -> Control -> Status accounting -> Verification)
2. Add onboarding risk scan when inheriting or auditing a repository
3. Include commit governance from Conventional Commits when creating commits
4. For large-scope merge operations, use risk scoring and Ask Gate criteria from ../../workflows/scm.md

CM process map (software)

CM workflows (use before risky history operations)

1) Planning

1. Read commit-config.yaml and files listed under documented_process.
2. If missing, infer from CONTRIBUTING.md / README; state assumptions.
3. Confirm branching model and whether force-push on shared branches is allowed (default: not without explicit approval).

2) Identification

1. Canonical refs: default branch, release branches/tags, version sources (package.json, etc.).
2. .gitattributes / LFS for binaries and generated assets.
3. Branch names vs commit-config.yaml branch_prefixes when the project uses them.

3) Control

1. Small, reviewable units; align commits with PR / issue intent.
2. Conflicts: merge-base, git status, resolve markers, tests; suggest rerere when conflicts repeat.
3. Worktrees: git worktree add; merge/rebase from the target branch’s checkout; all worktrees share one object database.
4. Do not rewrite shared history without maintainer approval; prefer --force-with-lease if force-push is unavoidable.

4) Status accounting

1. git status -sb: branch, remote tracking, ahead/behind, merge state.
2. Relate last tag / release branch to CHANGELOG or tooling (semantic-release, release-please, changesets) if present.

5) Verification & audit

1. Required CI and merge_group when merge queue applies.
2. Never stage/commit secrets (.env, keys, raw tokens). Filename patterns from commit-config.yaml forbidden_patterns are enforced mechanically by the scm-guard PreToolUse hook; for content-level leaks (tokens hardcoded in ordinary source files), run a scanner when available (gitleaks protect --staged, trufflehog git) before large or unfamiliar commits.
3. Call out signed-commit expectations when the org cares about verification badges.

CODEOWNERS maintenance checklist

1. Validate CODEOWNERS file exists (prefer .github/CODEOWNERS).
2. Ensure critical paths are explicitly owned (not only fallback *).
3. Ensure owners are active and mapped to current teams.
4. Confirm branch protection requires CODEOWNERS review where needed.
5. Flag overlapping/ambiguous rules that can hide intended owners.

Read change_governance.require_codeowners and ownership.* in commit-config.yaml when present.

6) Onboarding risk scan (optional, recommended)

Use this quick scan when joining or inheriting a repository to identify risky areas before major changes.

1. High churn files in lookback window.
2. Ownership concentration / bus-factor signals.
3. Bug hotspot files from fix-related history.
4. Velocity trend by month.
5. Revert/hotfix/emergency frequency.

Read thresholds from commit-config.yaml onboarding_metrics when present and cite caveats:

• squash merge teams can distort ownership metrics,
• weak commit labeling reduces hotspot accuracy,
• monorepo commit counts can bias subsystem interpretation.

Conventional Commits

Commit types

Commit format

<type>(<scope>): <description>

[optional body]

Co-Authored-By: First Fluke <our.first.fluke@gmail.com>

Commit workflow

Step 1: Analyze changes

git status
git diff --staged
git log --oneline -5

Step 1.5: Split by feature (if needed)

If changes span multiple features/domains, split commits by feature.

Split when: the changes are logically independent (different features, unrelated fixes).

Do not split when: one logical change (even if it touches code + tests + docs together), or the user asked for a single commit.

Precedence for edge cases (when both readings are defensible):

1. Logical independence decides first — one logical change is one commit regardless of how many types/scopes it touches.
2. File count is only a tiebreaker: ≤5 files lean single commit; >5 files spanning multiple scopes/types lean split.
3. An explicit user instruction (single commit or split) overrides both.

Step 2: Determine type

• New capability → feat · Bug fix → fix · Structure-only → refactor · Docs only → docs · Tests → test · Build/config → chore

Step 3: Scope

Use module/component: feat(auth):, fix(api):, or omit: chore: update dependencies

Step 4: Description

≤72 chars (per commit-config.yaml), imperative mood, lowercase start, no trailing period.

Step 5: Execute commit

Show the message, then commit with explicit paths:

git add <specific-files>
git commit -m "$(cat <<'EOF'
<type>(<scope>): <description>

[optional body]

Co-Authored-By: First Fluke <our.first.fluke@gmail.com>
EOF
)"

If HEREDOC is unstable in your shell (or body is long), use file-based commit input:

git add <specific-files>
msgfile="$(mktemp)"
cat > "$msgfile" <<'EOF'
<type>(<scope>): <description>

[optional body]

Co-Authored-By: First Fluke <our.first.fluke@gmail.com>
EOF
git commit -F "$msgfile"
rm -f "$msgfile"

Use HEREDOC by default, and switch to -F for long or flaky terminal sessions.

Push and PR safety (only when requested)

Push only when the user asks or a workflow requires it. Before pushing:

1. git status -sb — confirm branch, remote tracking, ahead/behind.
2. Protected-branch check: if the target is the default/protected branch and commit-config.yaml sets require_pr_for_default_branch: true, push a topic branch and open a PR (gh pr create) instead of pushing directly — unless the user explicitly instructed a direct push (Guardrail 0).
3. Never plain --force; after an approved history rewrite use git push --force-with-lease.
4. If push is rejected (non-fast-forward), fetch and rebase/merge locally; do not retry with force.

Amend, fixup, autosquash

First determine whether the target commits are shared:

git status -sb                 # ahead/behind vs upstream
git log --oneline @{u}..HEAD   # commits not yet pushed (errors when no upstream — treat all as unpushed)

• Unpushed commits: git commit --amend, git commit --fixup <sha> + git rebase -i --autosquash, and interactive rebase are safe — proceed.
• Pushed/shared commits: this is a shared-history rewrite — require maintainer approval (Guardrail 4) and use --force-with-lease when pushing the result.
• Before --amend, check git diff --staged: the amend must not silently absorb unrelated staged changes.

References

• .agents/oma-config.yaml
• resources/conventional-commits.md
• resources/onboarding-risk-signals.md
• resources/codeowners-playbook.md
• Observability handoff: ../oma-observability/SKILL.md §Integrations — release markers (service.version), revert baseline diff

Important notes

• Explicit user instruction wins. A clear user directive on how to commit/push/branch overrides every rule below (and every other guardrail). Follow it without arguing; the only thing that still warrants a heads-up is likely-secret material.
• NEVER git add -A or git add . without explicit user permission.
• NEVER commit likely-secret material.
• ALWAYS stage by explicit paths; tie non-trivial CM work to the five CM rows above, even briefly.