mediajunkiemediajunkie/piper-morgan-product/.cursor/rules/architecture-patterns.mdc

piper-morgan-product / rules

Cursor rule8 starsChanged 7 days agoApache-2.0View on GitHub

Domain-driven design and repository patterns

Where files are headingNew Cursor rule files have more rules about planning and tracking tasks, and fewer about code style.
Of the Cursor rule files we read, the 4,181 first seen in the last six months, against the older ones: the kind of rule that gained most share, and the kind that lost most. About files like this in general, not this one, and an estimate, since a kind is a pattern in the words.
In this repository39 other files it gives its agents.
- CLAUDE.mdCLAUDE.md
- .cursor/rules/completion-discipline.mdCursor rule
- .cursor/rules/github-tracking.mdcCursor rule
- .cursor/rules/programmer-briefing.mdcCursor rule
- .cursor/rules/verification-first.mdcCursor rule
- ab-a-isolationSkill
- assign-sprint-safelySkill
- audit-cascadeSkill
- brief-coding-agentSkill
- check-mailboxSkill
- cleanup-dev-activeSkill
- close-issue-properlySkill
- cohort-attention-rollupSkill
- compost-reviewSkill
- continue-narrativeSkill
- create-omnibusSkill
- create-session-logSkill
- cut-releaseSkill
- delete-module-safelySkill
- deliver-mailSkill
- discovered-work-captureSkill
- doc-sync-sweepSkill
- draft-blog-postSkill
- draft-weekly-shipSkill
- duty-cycle-tickSkill
- narrative-verificationSkill
- piper-draft-issueSkill
- piper-draft-specSkill
- piper-sprint-planSkill
- piper-stakeholder-updateSkill
- piper-synthesize-feedbackSkill
- propose-featureSkill
- publish-to-blogSkill
- query-github-boardSkill
- template-auditSkill
- trust-checkSkill
- update-calendarSkill
- update-current-stateSkill
- update-piperSkill

The file

We split this architecture-patterns.mdc into the rules it gives an agent

6 rules. About 0 are common, 3 are distinctive, and 3 are very specific to this project.

≈0
Common · estimate
Many files like this have a rule of this kind.
≈3
Distinctive · estimate
This author's own choices. Worth a look.
3
Very specific
Tied to their project's names, files or tools. Probably skip.

Common
Distinctive
Very specific

Very specific:
ALL data access through services/repositories/
line 16
Distinctive:
No business logic in repositories
line 18
Very specific:
Read: services/queries/ (QueryRouter)
line 21
Very specific:
Write: services/orchestration/ (workflows)
line 22
Distinctive:
Never mix read/write in same service
line 23
Distinctive:
No request data in instances
line 28

≈ “Common” is an estimate: at least 1 in 5 of the 6,668 Cursor rule files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.

Files

architecture-patterns.mdc

---
description: Domain-driven design and repository patterns
globs:
  - "services/**/*.py"
  - "tests/**/*.py"
alwaysApply: false
---

# Architecture Patterns

## Domain-Driven Design
- Domain models in services/domain/models.py drive ALL decisions
- Database schema generated from SQLAlchemy models

## Repository Pattern
- ALL data access through services/repositories/
- Repositories return domain models, never database models
- No business logic in repositories

## CQRS Separation
- Read: services/queries/ (QueryRouter)
- Write: services/orchestration/ (workflows)
- Never mix read/write in same service

## Stateless Design
- Factories remain stateless
- Context passed as parameters
- No request data in instances

See ARCHITECTURE-RULES.md for complete details.

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