maintain-documentation

Maintain Documentation

Apply this skill when implementing a new feature or changing behavior so that both docs/ (canonical truth) and .cursor/ (rules and summaries) stay accurate and discoverable.

Where documentation lives

• Map: .cursor/index.mdc (rules + architecture list), docs/README.md (docs index), .cursor/CONTEXT_MAP.md (what to load per area).
• Ownership: docs/ owns full architecture, design system, module behavior, implementations. .cursor/ owns operational rules and summaries + links only. Rule: .cursor/architecture/* must not contain unique facts that do not exist in docs/; add to docs first, then summarize or link from .cursor.

Quick reference

Workflow by change type

New feature or new module

1. Canonical: Add or update docs/modules/<module-name>/ with at least one doc (e.g. MODULE_NAME.md): component hierarchy, key files, state/API, types. Follow existing module docs (e.g. docs/modules/kafka/, docs/modules/notifications/) for structure.
2. .cursor: Add one line to .cursor/architecture/MODULE_ARCHITECTURE.md under "Notable modules". Add the module to the "Modules" list in .cursor/architecture/ARCHITECTURE_OVERVIEW.md. Add a row to .cursor/CONTEXT_MAP.md ("When you work on…" → "Load first"). Add the module to the "Modules" table in docs/README.md if not already there.
3. Vocabulary: If the feature involves "notifications", use notification center for the product feature (panel, store, channels) and in-app notifications for the notify() toast/banner/modal system; see .cursor/architecture/NOTIFICATION_CENTER.md vs IN_APP_NOTIFICATIONS.md.
4. Design/UX alignment: Apply design principles; see the apply-design-principles skill and docs/design/DESIGN_PRINCIPLES.md.

New store slice

1. Canonical: Update docs/architecture/ARCHITECTURE_OVERVIEW.md (store structure / Service responsibilities or equivalent).
2. .cursor: Add the slice to the "Store composition" and "Domain slices" sections in .cursor/architecture/STATE_MANAGEMENT.md. Add the slice name to the list in .cursor/state-management.mdc. Add the slice to the "Store slices" list in .cursor/architecture/ARCHITECTURE_OVERVIEW.md. If the slice participates in pipeline hydration, add it to the Hydration section in STATE_MANAGEMENT.md and to hydrateSection options.

New implementation (non-obvious behavior)

When adding something that looks like normal UI but has specific constraints (e.g. a new streaming mechanism, auth path, or feature-flag–driven behavior):

1. Canonical: Add docs/implementations/<NAME>.md (overview, architecture, key files, constraints/risks).
2. .cursor: Add a row to .cursor/architecture/IMPLEMENTATIONS_INDEX.md with topic, short description, constraint/risk one-liner, and link to the doc. Optionally add the flow to the "Critical flows index" in .cursor/architecture/ARCHITECTURE_OVERVIEW.md.

Styling / design system changes

1. Canonical: All new tokens, card variants, and usage live in docs/architecture/DESIGN_SYSTEM.md. Do not add token or variant definitions only in .cursor.
2. .cursor: Keep .cursor/styling.mdc and .cursor/architecture/THEMING_ARCHITECTURE.md as directives and summaries that point to DESIGN_SYSTEM.md; no new unique token names or values only in .cursor.

Architecture or data-flow change

1. Canonical: Update docs/architecture/ARCHITECTURE_OVERVIEW.md (tech stack, directory tree, data flows, store, API, invariants as needed).
2. .cursor: Update the snapshot in .cursor/architecture/ARCHITECTURE_OVERVIEW.md: ensure the modules list, store slices list, and "Critical flows index" match reality and link to docs. Do not add new architectural facts only in .cursor.

Checklist before finishing

• Every new fact or detailed behavior is recorded in docs/ first (appropriate file under docs/architecture/, docs/modules/, or docs/implementations/).
• .cursor/architecture/* only summarizes or links; no unique facts that exist only there.
• If a new module or area was added: CONTEXT_MAP.md has a row; docs/README.md and MODULE_ARCHITECTURE / ARCHITECTURE_OVERVIEW lists are updated.
• If a new implementation or hidden constraint was added: IMPLEMENTATIONS_INDEX.md has a row with constraint/risk and link.
• Naming: "Notification center" vs "in-app notifications" used consistently; no ambiguous "notifications" when both could apply.

Key file paths (from repo root ui/)

• Rules and ownership: .cursor/index.mdc
• Docs index: docs/README.md
• Context map: .cursor/CONTEXT_MAP.md
• Architecture snapshot: .cursor/architecture/ARCHITECTURE_OVERVIEW.md
• Full architecture: docs/architecture/ARCHITECTURE_OVERVIEW.md
• Design system: docs/architecture/DESIGN_SYSTEM.md
• Implementations index: .cursor/architecture/IMPLEMENTATIONS_INDEX.md
• Module list: .cursor/architecture/MODULE_ARCHITECTURE.md
• State/slices: .cursor/architecture/STATE_MANAGEMENT.md, .cursor/state-management.mdc