context-commit

name	context-commit
description	Write contextual commits that capture intent, decisions, and constraints alongside code changes. Use when committing code, finishing a task, or when the user asks to commit. Extends Conventional Commits with structured action lines in the commit body that preserve WHY code was written, not just WHAT changed. Validates scopes against the codegraph.
user-invocable	true
allowed-tools	["Read","Glob","Grep","Bash"]

Contextual Commits

You write commits that carry development reasoning in the body — the intent, decisions, constraints, and learnings that the diff alone cannot show.

The Problem You Solve

Standard commits preserve WHAT changed. The diff shows that too. What gets lost is WHY — what the user asked for, what alternatives were considered, what constraints shaped the implementation, what was learned along the way. This context evaporates when the session ends. You prevent that.

Before You Write the Commit

0. Ensure Fresh Codegraph

Run engraph graph to ensure the codegraph is up to date. This is fast and deterministic. Skip only if you just ran it in this session.

engraph graph

1. Snapshot Staged State at Invocation

Before doing anything else, run git diff --cached --stat and record the result. This is the invocation snapshot — the set of files the user had staged when the skill was called. It determines which path applies for the entire run. Do not re-evaluate this later; files staged by you during the workflow are not part of the invocation snapshot.

Path A — files were staged at invocation

The user deliberately staged these files before calling the skill. They are the entire scope of this commit. Do not look at unstaged or untracked files. After committing the invocation snapshot, stop — do not proceed to commit anything else.

Path B — nothing was staged, unstaged changes exist

Run git status --short. If it returns output, the user wants to commit their full session's work. Run git diff to get the complete picture of all unstaged modifications and untracked files. If git status --short returns nothing, skip to Path C.

Group by logical unit. Examine the full diff and determine whether all changes belong to the same logical change (one feature, fix, or refactor) or span multiple unrelated concerns.

• One logical unit: stage everything, commit it as one, done.
• Multiple logical units: identify the groups. For each group in sequence: present the proposed staging to the user, wait for approval, stage those files, write the commit draft, wait for approval again, then commit. Repeat until all groups are committed. Never silently bundle unrelated changes into one commit.

Path C — nothing staged, nothing unstaged

The working tree is completely clean. The user wants to record reasoning without any code change. Confirm with git status --short returning empty output.

Valid scenarios:

1. Planning commit — capture intent, decisions, and scope before writing code. Use chore(scope): add plan reasoning as the subject, where scope is the real codegraph module the plan applies to (e.g. chore(migrations): add plan reasoning). Omit scope if the plan is cross-cutting. Future sessions read this reasoning via engraph recall.

2. Retrospective capture — reasoning that emerged after a commit was already written but the session is still live. Subject: chore(scope): retrospective capture. A standalone empty commit preserves it in the timeline without touching any file.

3. Rejected-approach capture — something was considered and abandoned before any code was written. Subject: chore(scope): add rejected reasoning. rejected(scope): ... lines in the body record it so future sessions don't re-propose the same path.

4. Correction commit — a prior commit's body contained wrong or incomplete reasoning, and history rewrite is not viable (already pushed, shared branch). Subject: chore(scope): add correction (or omit scope if cross-cutting). An empty commit with correcting action lines updates the record. If the prior commit said decision(db): pg-vector chosen..., the correction carries rejected(db): pg-vector — reason and decision(db): new approach, so that engraph recall reads the full evolution: chosen → rejected → corrected decision. The temporal sequence is the record.

If no arguments were passed and there is no preceding conversation context, stop. There is nothing to capture. Inform the user: "Nothing staged and no context to record — if you meant to capture something, share it and I'll write the commit." Do not fabricate action lines.

Use git commit --allow-empty when executing. Write only what is evidenced in conversation context — no fabrication. The same user approval gate (Step 6) applies.

---

2. Check Branch History for Existing Context

Run git log --format="%B" HEAD~10..HEAD (or since the branch diverged from main) to read action lines already captured in prior commits on this branch.

Do not repeat reasoning that is already persisted. Plan commits (chore(scope): add plan reasoning) and earlier implementation commits may already capture intent, decisions, rejected alternatives, and constraints. Your commit should only carry:

• New reasoning that emerged during this specific implementation work
• Refinements to prior decisions (e.g., a decision changed during implementation)
• Implementation-specific learnings discovered while writing the code

If a decision was already stated in a plan commit and the implementation followed it without change, do not restate it. The git history is a timeline — each commit adds new signal, not a restated summary.

Prefer an empty body over fabricated context. A clean conventional commit subject with no action lines is a valid contextual commit. Not every commit produces new reasoning worth capturing. If checking the branch history and session context yields no new signal, write the subject line only. The goal is signal density, not action line count.

3. Resolve Scopes from Codegraph

Read .engraph/codegraph/index.yaml and map each changed file to its module ID. If a module has a sub_graph field, follow that reference for deeper resolution.

Aliases are preferred when available. Check the alias field on each module — if present, use the alias as the scope instead of the path-based module ID. The whole point of aliases is to provide short, developer-friendly code names.

Scopes must use dashes, never slashes. A scope is either the module alias (always preferred) or the dashed form of the module ID (e.g. commands-graph, not commands/graph). Slashes are strictly forbidden in scopes — they break conventional commit parsers and CI tooling. There are no exceptions.

Examples:

• File src/commands/graph/scanner.ts → module commands/graph → alias codegraph → scope codegraph ✓
• File src/commands/upgrade/migrations/v2_0.ts → module commands/upgrade/migrations → alias migrations → scope migrations ✓
• File src/utils/config.ts → module utils → no alias → scope utils ✓
• File src/cli.ts → module root → no alias → omit scope from subject line (see below)
• ❌ fix(commands/graph): … — slash in scope, invalid
• ✓ fix(codegraph): … — alias, correct

If no codegraph exists (project hasn't run engraph init), fall back to human-readable concept labels.

4. Determine Subject Line Scope

• Use the alias (or module ID if no alias) of the primary changed module
• If the commit touches multiple modules, use their lowest common ancestor
• If scope resolves to root: omit the scope from the subject line entirely. Write type: subject not type(root): subject. Keep root in body action lines where it's useful for filtering.

5. Validate Scopes

Every scope() in action lines must reference a valid alias or module ID from the codegraph. Before writing the commit:

• Collect all scopes you plan to use
• Verify each one exists as either an alias or id in the codegraph
• If a scope doesn't match, find the correct module or use a valid ancestor

6. Draft, Present, and Wait for Approval

Write the full commit message (subject + body) and show it to the user before committing. This step is mandatory — never run git commit without explicit user approval.

Present the draft clearly, e.g.:

Here's the commit message — let me know if you'd like any changes before I commit:

---
type(scope): subject line

action-type(scope): ...
---

Wait for the user to confirm or request edits. Only after explicit approval (looks good, go ahead, commit it, or similar) do you execute git commit.

Commit Format

The subject line is a standard Conventional Commit. The body contains action lines — typed, scoped entries that capture reasoning.

type(scope): subject line (standard conventional commit)

action-type(scope): description of reasoning or context
action-type(scope): another entry

Subject Line

Follow Conventional Commits exactly:

• feat(auth): implement Google OAuth provider
• fix(payments): handle currency rounding edge case
• refactor(notifications): extract digest scheduling logic

Action Lines

Each line in the body follows: action-type(scope): description

Use lowercase for description text — no sentence case.

Action Types

Use only the types that apply. Most commits need 1-3 action lines. Never pad with noise.

intent(scope): ...

What the user wanted to achieve and why. Captures the human's voice, not your interpretation.

• intent(auth): social login starting with Google, then GitHub and Apple
• intent(notifications): users want batch notifications instead of per-event emails

When to use: Most feature work, refactoring with a purpose, any change where the motivation isn't obvious from the subject line.

decision(scope): ...

What approach was chosen when alternatives existed. Brief reasoning.

• decision(oauth-library): passport.js over auth0-sdk for multi-provider flexibility
• decision(digest-schedule): weekly on Monday 9am, not daily — matches user research

When to use: When you evaluated options. Skip for obvious choices with no real alternatives.

rejected(scope): ...

What was considered and explicitly discarded, with the reason. This is the highest-value action type — it prevents future sessions from re-proposing the same thing.

• rejected(oauth-library): auth0-sdk — locks into their session model, incompatible with redis store
• rejected(currency-handling): account-level default — too limiting for marketplace sellers

When to use: Every time you or the user considered a meaningful alternative and chose not to pursue it. Always include the reason.

constraint(scope): ...

Hard limits, dependencies, or boundaries discovered during implementation that shaped the approach.

• constraint(callback-routes): must follow /api/auth/callback/:provider pattern per existing convention
• constraint(stripe-integration): currency required at PaymentIntent creation, cannot change after

When to use: When non-obvious limitations influenced the implementation. Things the next person working here would need to know.

learned(scope): ...

Something discovered during implementation that would save time in future sessions.

• learned(passport-google): requires explicit offline_access scope for refresh tokens, undocumented in quickstart
• learned(stripe-multicurrency): presentment currency and settlement currency are different concepts

When to use: "I wish I'd known this before I started" moments. Library gotchas, API surprises, non-obvious behaviors.

Examples

Simple fix — no action lines needed

fix(button): correct alignment on mobile viewport

The conventional commit subject is sufficient. Don't add noise.

Moderate feature

feat(notifications): add email digest for weekly summaries

intent(notifications): users want batch notifications instead of per-event emails
decision(digest-schedule): weekly on Monday 9am — matches user research feedback
constraint(email-provider): SendGrid batch API limited to 1000 recipients per call

Complex architectural change

refactor(payments): migrate from single to multi-currency support

intent(payments): enterprise customers need EUR and GBP alongside USD
decision(currency-handling): per-transaction currency over account-level default
rejected(currency-handling): account-level default too limiting for marketplace sellers
rejected(money-library): accounting.js — lacks sub-unit arithmetic, using currency.js instead
constraint(stripe-integration): Stripe requires currency at PaymentIntent creation, cannot change after
learned(stripe-multicurrency): presentment currency vs settlement currency are different Stripe concepts

When You Lack Conversation Context

Sometimes staged changes include work you didn't produce — prior session output, another agent's changes, manual edits. For any change where you lack the reasoning trail:

Only write action lines for what is clearly evidenced in the diff. Do not speculate about intent or constraints you cannot observe.

What you CAN infer from a diff alone:

• decision(scope) — if a clear technical choice is visible (new dependency added, pattern adopted)

What you CANNOT infer — do not fabricate:

• intent(scope) — why the change was made is not in the diff
• rejected(scope) — what was NOT chosen is invisible in what WAS committed
• constraint(scope) — hard limits are almost never visible in code changes
• learned(scope) — learnings come from the process, not the output

A clean conventional commit subject with no action lines is always better than fabricated context.

Rules

1. The subject line is a Conventional Commit. Never break existing conventions or tooling.
2. Action lines go in the body only. Never in the subject line.
3. Only write action lines that carry signal. If the diff already explains it, don't repeat it.
4. Use lowercase for action line descriptions. No sentence case.
5. Use codegraph aliases as scopes when available. Fall back to module IDs only when no alias exists.
6. Scopes use dashes, never slashes. commands-graph is valid; commands/graph is forbidden, no exceptions.
7. Validate all scopes against the codegraph. Every scope must be a valid alias or module ID.
8. Omit root scope from the subject line. Keep it in body action lines for filtering.
9. Capture the user's intent in their words. For intent lines, reflect what the human asked for.
10. Always explain why for rejected lines. A rejection without a reason is useless.
11. Don't invent action lines for trivial commits. A typo fix or dependency bump needs no action lines.
12. Don't fabricate context you don't have. See "When You Lack Conversation Context" above.
13. Don't duplicate reasoning from prior commits. Check branch history first. Each commit adds new signal to the timeline, not a restated summary.
14. Prefer an empty body over noise. A subject-only commit is a valid contextual commit. Not every change produces reasoning worth capturing.
15. The invocation snapshot is the fixed scope for Path A. Record what was staged when the skill was called; never re-check mid-workflow. Files staged by the agent during the run are not user-staged and do not extend Path A scope. Stop after committing the snapshot.
16. Path B requires logical grouping before staging anything. Analyse the full unstaged diff first, group by logical unit, then stage and commit each group separately with user approval at each step.
17. Always get user approval before committing. Present the full draft and wait for explicit confirmation. Never run git commit without it.
18. Path C requires --allow-empty. When the working tree is clean, always use git commit --allow-empty. Correction commits update the reasoning record in place — prefer them over once commits are pushed or shared.