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d70bab85e3
- AGENTS.md: universal cross-tool file read by Claude Code, Cursor, Codex, and OpenCode - .cursor/: 15 hook events via hooks.json, 16 hook scripts with DRY adapter pattern, 29 rules (9 common + 20 language-specific) with Cursor YAML frontmatter - .codex/: reference config.toml, Codex-specific AGENTS.md supplement, 10 skills ported to .agents/skills/ with openai.yaml metadata - .opencode/: 3 new tools (format-code, lint-check, git-summary), 3 new hooks (shell.env, experimental.session.compacting, permission.ask), expanded instructions, version bumped to 1.6.0 - README: fixed Cursor section, added Codex section, added cross-tool parity table - install.sh: now copies hooks.json + hooks/ for --target cursor
53 lines
1.5 KiB
Markdown
53 lines
1.5 KiB
Markdown
---
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description: "ECC coding style: immutability, file organization, error handling, validation"
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alwaysApply: true
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---
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# Coding Style
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## Immutability (CRITICAL)
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ALWAYS create new objects, NEVER mutate existing ones:
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```
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// Pseudocode
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WRONG: modify(original, field, value) → changes original in-place
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CORRECT: update(original, field, value) → returns new copy with change
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```
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Rationale: Immutable data prevents hidden side effects, makes debugging easier, and enables safe concurrency.
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## File Organization
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MANY SMALL FILES > FEW LARGE FILES:
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- High cohesion, low coupling
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- 200-400 lines typical, 800 max
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- Extract utilities from large modules
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- Organize by feature/domain, not by type
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## Error Handling
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ALWAYS handle errors comprehensively:
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- Handle errors explicitly at every level
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- Provide user-friendly error messages in UI-facing code
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- Log detailed error context on the server side
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- Never silently swallow errors
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## Input Validation
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ALWAYS validate at system boundaries:
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- Validate all user input before processing
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- Use schema-based validation where available
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- Fail fast with clear error messages
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- Never trust external data (API responses, user input, file content)
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## Code Quality Checklist
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Before marking work complete:
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- [ ] Code is readable and well-named
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- [ ] Functions are small (<50 lines)
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- [ ] Files are focused (<800 lines)
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- [ ] No deep nesting (>4 levels)
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- [ ] Proper error handling
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- [ ] No hardcoded values (use constants or config)
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- [ ] No mutation (immutable patterns used)
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