egc

name	egc
description	Development conventions and patterns for EGC - Extended Global Context. JavaScript project with conventional commits.

EGC - Extended Global Context Conventions

Overview

This skill teaches the development patterns and conventions used in EGC (Extended Global Context).

Tech Stack

• Primary Language: JavaScript
• Architecture: hybrid module organization
• Test Location: separate

When to Use This Skill

Activate this skill when:

• Making changes to this repository
• Adding new features following established patterns
• Writing tests that match project conventions
• Creating commits with proper message format

Commit Conventions

Follow these commit message conventions based on 500 analyzed commits.

Commit Style: Conventional Commits

Prefixes Used

• fix
• test
• feat
• docs

Message Guidelines

• Average message length: ~65 characters
• Keep first line concise and descriptive
• Use imperative mood ("Add feature" not "Added feature")

Commit message example

feat(rules): add C# language support

Commit message example

chore(deps-dev): bump flatted (#675)

Commit message example

fix: auto-detect EGC root from plugin cache when GEMINI_PLUGIN_ROOT is unset (#547) (#691)

Commit message example

docs: add Antigravity setup and usage guide (#552)

Commit message example

merge: PR #529: feat(skills): add documentation-lookup, bun-runtime, nextjs-turbopack; feat(agents): add rust-reviewer

Commit message example

Revert "Add Kiro IDE support (.kiro/) (#548)"

Commit message example

Add Kiro IDE support (.kiro/) (#548)

Commit message example

feat: add block-no-verify hook for Gemini Code and Cursor (#649)

Architecture

Project Structure: Single Package

This project uses hybrid module organization.

Configuration Files

• .github/workflows/ci.yml
• .github/workflows/maintenance.yml
• .github/workflows/monthly-metrics.yml
• .github/workflows/release.yml
• .github/workflows/reusable-release.yml
• .github/workflows/reusable-test.yml
• .github/workflows/reusable-validate.yml
• .opencode/package.json
• .opencode/tsconfig.json
• .prettierrc
• eslint.config.js
• package.json

Guidelines

• This project uses a hybrid organization
• Follow existing patterns when adding new code

Code Style

Language: JavaScript

Naming Conventions

Element	Convention
Files	camelCase
Functions	camelCase
Classes	PascalCase
Constants	SCREAMING_SNAKE_CASE

Import Style: Relative Imports

Export Style: Mixed Style

Preferred import style

// Use relative imports
import { Button } from '../components/Button'
import { useAuth } from './hooks/useAuth'

Testing

Test Framework

No specific test framework detected: use the repository's existing test patterns.

File Pattern: *.test.js

Test Types

• Unit tests: Test individual functions and components in isolation
• Integration tests: Test interactions between multiple components/services

Coverage

This project has coverage reporting configured. Aim for 80%+ coverage.

Error Handling

Error Handling Style: Try-Catch Blocks

Standard error handling pattern

try {
  const result = await riskyOperation()
  return result
} catch (error) {
  console.error('Operation failed:', error)
  throw new Error('User-friendly message')
}

Common Workflows

These workflows were detected from analyzing commit patterns.

Database Migration

Database schema changes with migration files

Frequency: ~2 times per month

Steps:

1. Create migration file
2. Update schema definitions
3. Generate/update types

Files typically involved:

• **/schema.*
• migrations/*

Example commit sequence:

feat: implement --with/--without selective install flags (#679)
fix: sync catalog counts with filesystem (27 agents, 113 skills, 58 commands) (#693)
feat(rules): add Rust language rules (rebased #660) (#686)

Feature Development

Standard feature implementation workflow

Frequency: ~22 times per month

Steps:

1. Add feature implementation
2. Add tests for feature
3. Update documentation

Files typically involved:

• manifests/*
• schemas/*
• **/*.test.*
• **/api/**

Example commit sequence:

feat(skills): add documentation-lookup, bun-runtime, nextjs-turbopack; feat(agents): add rust-reviewer
docs(skills): align documentation-lookup with CONTRIBUTING template; add cross-harness (Codex/Cursor) skill copies
fix: address PR review: skill template (When to use, How it works, Examples), bun.lock, next build note, rust-reviewer CI note, doc-lookup privacy/uncertainty

Add Language Rules

Adds a new programming language to the rules system, including coding style, hooks, patterns, security, and testing guidelines.

Frequency: ~2 times per month

Steps:

1. Create a new directory under rules/{language}/
2. Add coding-style.md, hooks.md, patterns.md, security.md, and testing.md files with language-specific content
3. Optionally reference or link to related skills

Files typically involved:

• rules/*/coding-style.md
• rules/*/hooks.md
• rules/*/patterns.md
• rules/*/security.md
• rules/*/testing.md

Example commit sequence:

Create a new directory under rules/{language}/
Add coding-style.md, hooks.md, patterns.md, security.md, and testing.md files with language-specific content
Optionally reference or link to related skills

Add New Skill

Adds a new skill to the system, documenting its workflow, triggers, and usage, often with supporting scripts.

Frequency: ~4 times per month

Steps:

1. Create a new directory under skills/{skill-name}/
2. Add SKILL.md with documentation (When to Use, How It Works, Examples, etc.)
3. Optionally add scripts or supporting files under skills/{skill-name}/scripts/
4. Address review feedback and iterate on documentation

Files typically involved:

• skills/*/SKILL.md
• skills/*/scripts/*.sh
• skills/*/scripts/*.js

Example commit sequence:

Create a new directory under skills/{skill-name}/
Add SKILL.md with documentation (When to Use, How It Works, Examples, etc.)
Optionally add scripts or supporting files under skills/{skill-name}/scripts/
Address review feedback and iterate on documentation

Add New Agent

Adds a new agent to the system for code review, build resolution, or other automated tasks.

Frequency: ~2 times per month

Steps:

1. Create a new agent markdown file under agents/{agent-name}.md
2. Register the agent in AGENTS.md
3. Optionally update README.md and docs/COMMAND-AGENT-MAP.md

Files typically involved:

• agents/*.md
• AGENTS.md
• README.md
• docs/COMMAND-AGENT-MAP.md

Example commit sequence:

Create a new agent markdown file under agents/{agent-name}.md
Register the agent in AGENTS.md
Optionally update README.md and docs/COMMAND-AGENT-MAP.md

Add New Workflow Surface

Adds or updates a workflow entrypoint. Default to skills-first; only add a command shim when legacy slash compatibility is still required.

Frequency: ~1 times per month

Steps:

1. Create or update the canonical workflow under skills/{skill-name}/SKILL.md
2. Only if needed, add or update commands/{command-name}.md as a compatibility shim

Files typically involved:

• skills/*/SKILL.md
• commands/*.md (only when a legacy shim is intentionally retained)

Example commit sequence:

Create or update the canonical skill under skills/{skill-name}/SKILL.md
Only if needed, add or update commands/{command-name}.md as a compatibility shim

Sync Catalog Counts

Synchronizes the documented counts of agents, skills, and commands in AGENTS.md and README.md with the actual repository state.

Frequency: ~3 times per month

Steps:

1. Update agent, skill, and command counts in AGENTS.md
2. Update the same counts in README.md (quick-start, comparison table, etc.)
3. Optionally update other documentation files

Files typically involved:

• AGENTS.md
• README.md

Example commit sequence:

Update agent, skill, and command counts in AGENTS.md
Update the same counts in README.md (quick-start, comparison table, etc.)
Optionally update other documentation files

Add Cross Harness Skill Copies

Adds skill copies for different agent harnesses (e.g., Codex, Cursor, Antigravity) to ensure compatibility across platforms.

Frequency: ~2 times per month

Steps:

1. Copy or adapt SKILL.md to .agents/skills/{skill}/SKILL.md and/or .cursor/skills/{skill}/SKILL.md
2. Optionally add harness-specific openai.yaml or config files
3. Address review feedback to align with CONTRIBUTING template

Files typically involved:

• .agents/skills/*/SKILL.md
• .cursor/skills/*/SKILL.md
• .agents/skills/*/agents/openai.yaml

Example commit sequence:

Copy or adapt SKILL.md to .agents/skills/{skill}/SKILL.md and/or .cursor/skills/{skill}/SKILL.md
Optionally add harness-specific openai.yaml or config files
Address review feedback to align with CONTRIBUTING template

Add Or Update Hook

Adds or updates git or bash hooks to enforce workflow, quality, or security policies.

Frequency: ~1 times per month

Steps:

1. Add or update hook scripts in hooks/ or scripts/hooks/
2. Register the hook in hooks/hooks.json or similar config
3. Optionally add or update tests in tests/hooks/

Files typically involved:

• hooks/*.hook
• hooks/hooks.json
• scripts/hooks/*.js
• tests/hooks/*.test.js
• .cursor/hooks.json

Example commit sequence:

Add or update hook scripts in hooks/ or scripts/hooks/
Register the hook in hooks/hooks.json or similar config
Optionally add or update tests in tests/hooks/

Address Review Feedback

Addresses code review feedback by updating documentation, scripts, or configuration for clarity, correctness, or convention alignment.

Frequency: ~4 times per month

Steps:

1. Edit SKILL.md, agent, or command files to address reviewer comments
2. Update examples, headings, or configuration as requested
3. Iterate until all review feedback is resolved

Files typically involved:

• skills/*/SKILL.md
• agents/*.md
• commands/*.md
• .agents/skills/*/SKILL.md
• .cursor/skills/*/SKILL.md

Example commit sequence:

Edit SKILL.md, agent, or command files to address reviewer comments
Update examples, headings, or configuration as requested
Iterate until all review feedback is resolved

Best Practices

Based on analysis of the codebase, follow these practices:

Do

• Use conventional commit format (feat:, fix:, etc.)
• Follow *.test.js naming pattern
• Use camelCase for file names
• Prefer mixed exports

Don't

• Don't write vague commit messages
• Don't skip tests for new features
• Don't deviate from established patterns without discussion

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