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feat: add GitHub Copilot prompt support

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Adds GitHub Copilot VS Code instruction and prompt files for ECC workflows, with VS Code prompt frontmatter/settings aligned to current docs and tests covering the surface.

Co-authored-by: Girish Kanjiyani <girish.kanjiyani5040@gmail.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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Girish Kanjiyani
2026-05-12 23:00:00 -04:00
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commit 766f4ee1d8
14 changed files with 650 additions and 28 deletions
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README.md
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@@ -38,7 +38,7 @@
Not just configs. A complete system: skills, instincts, memory optimization, continuous learning, security scanning, and research-first development. Production-ready agents, skills, hooks, rules, MCP configurations, and legacy command shims evolved over 10+ months of intensive daily use building real products.
Works across **Claude Code**, **Codex**, **Cursor**, **OpenCode**, **Gemini**, and other AI agent harnesses.
Works across **Claude Code**, **Codex**, **Cursor**, **OpenCode**, **Gemini**, **GitHub Copilot**, and other AI agent harnesses.
ECC v2.0.0-rc.1 adds the public Hermes operator story on top of that reusable layer: start with the [Hermes setup guide](docs/HERMES-SETUP.md), then review the [rc.1 release notes](docs/releases/2.0.0-rc.1/release-notes.md) and [cross-harness architecture](docs/architecture/cross-harness.md).
@@ -1096,13 +1096,14 @@ Each component is fully independent.
</details>
<details>
<summary><b>Does this work with Cursor / OpenCode / Codex / Antigravity?</b></summary>
<summary><b>Does this work with Cursor / OpenCode / Codex / Antigravity / GitHub Copilot?</b></summary>
Yes. ECC is cross-platform:
- **Cursor**: Pre-translated configs in `.cursor/`. See [Cursor IDE Support](#cursor-ide-support).
- **Gemini CLI**: Experimental project-local support via `.gemini/GEMINI.md` and shared installer plumbing.
- **OpenCode**: Full plugin support in `.opencode/`. See [OpenCode Support](#opencode-support).
- **Codex**: First-class support for both macOS app and CLI, with adapter drift guards and SessionStart fallback. See PR [#257](https://github.com/affaan-m/everything-claude-code/pull/257).
- **GitHub Copilot (VS Code)**: Instruction and prompt layer via `.github/copilot-instructions.md`, `.vscode/settings.json`, and `.github/prompts/`. See [GitHub Copilot Support](#github-copilot-support).
- **Antigravity**: Tightly integrated setup for workflows, skills, and flattened rules in `.agent/`. See [Antigravity Guide](docs/ANTIGRAVITY-GUIDE.md).
- **JoyCode / CodeBuddy**: Project-local selective install adapters for commands, agents, skills, and flattened rules. See [JoyCode Adapter Guide](docs/JOYCODE-GUIDE.md).
- **Qwen CLI**: Home-directory selective install adapter for commands, agents, skills, rules, and Qwen config. See [Qwen CLI Adapter Guide](docs/QWEN-GUIDE.md).
@@ -1459,28 +1460,85 @@ For the full ECC OpenCode setup, either:
---
## GitHub Copilot Support
ECC provides **GitHub Copilot support** for VS Code via Copilot Chat's native instruction and prompt file system — no extra tooling required.
### What's Included
| Component | File | Purpose |
|-----------|------|---------|
| Core instructions | `.github/copilot-instructions.md` | Always-loaded rules: coding style, security, testing, git workflow |
| VS Code settings | `.vscode/settings.json` | Per-task instruction files for code gen, test gen, review, and commit messages |
| Plan prompt | `.github/prompts/plan.prompt.md` | Phased implementation planning |
| TDD prompt | `.github/prompts/tdd.prompt.md` | Red-Green-Improve cycle |
| Code review prompt | `.github/prompts/code-review.prompt.md` | Quality and security review |
| Security review prompt | `.github/prompts/security-review.prompt.md` | Deep OWASP-aligned security analysis |
| Build fix prompt | `.github/prompts/build-fix.prompt.md` | Systematic build and CI error resolution |
| Refactor prompt | `.github/prompts/refactor.prompt.md` | Dead code cleanup and simplification |
### Quick Start (GitHub Copilot)
The files are already in place — open any repo that contains this project and GitHub Copilot Chat will automatically pick up `.github/copilot-instructions.md`.
The committed `.vscode/settings.json` enables `chat.promptFiles` so VS Code can load the reusable prompts from `.github/prompts/`.
To use the workflow prompts in Copilot Chat:
1. Open the Copilot Chat panel in VS Code.
2. Click the **paperclip / attach** icon and select **Prompt...**, or type `/` and choose a prompt.
3. Select the prompt (e.g. `plan`, `tdd`, `code-review`).
### How It Works
GitHub Copilot in VS Code reads two types of files automatically:
- **`.github/copilot-instructions.md`** — repository-level instructions, always injected into every Copilot Chat request. Contains ECC's core coding standards, security checklist, testing requirements, and git workflow.
- **`.github/prompts/*.prompt.md`** — reusable prompt files users invoke on demand. Each prompt walks Copilot through a specific ECC workflow (plan → TDD → review → ship).
The **`.vscode/settings.json`** adds per-task instruction overlays so Copilot receives the right context depending on whether you are generating code, writing tests, reviewing a selection, or drafting a commit message.
### Feature Coverage
| ECC Feature | Copilot equivalent |
|-------------|-------------------|
| Coding standards | Always-on via `copilot-instructions.md` |
| Security checklist | Always-on + `security-review` prompt |
| Testing / TDD | Always-on + `tdd` prompt |
| Implementation planning | `plan` prompt |
| Code review | `code-review` prompt |
| Build error resolution | `build-fix` prompt |
| Refactoring | `refactor` prompt |
| Commit message format | Per-task instruction in `settings.json` |
| Hooks / automation | Not supported (Copilot has no hook system) |
| Agents / delegation | Not supported (Copilot has no subagent API) |
### Limitations
GitHub Copilot does not have a hook system or a subagent API, so ECC's hook automations (auto-format, TypeScript check, session persistence, dev-server guard) and agent delegation are unavailable. The instruction and prompt layer still brings the full ECC coding philosophy — standards, security, TDD, and workflow — into every Copilot Chat session.
---
## Cross-Tool Feature Parity
ECC is the **first plugin to maximize every major AI coding tool**. Here's how each harness compares:
| Feature | Claude Code | Cursor IDE | Codex CLI | OpenCode |
|---------|------------|------------|-----------|----------|
| **Agents** | 60 | Shared (AGENTS.md) | Shared (AGENTS.md) | 12 |
| **Commands** | 75 | Shared | Instruction-based | 35 |
| **Skills** | 228 | Shared | 10 (native format) | 37 |
| **Hook Events** | 8 types | 15 types | None yet | 11 types |
| **Hook Scripts** | 20+ scripts | 16 scripts (DRY adapter) | N/A | Plugin hooks |
| **Rules** | 34 (common + lang) | 34 (YAML frontmatter) | Instruction-based | 13 instructions |
| **Custom Tools** | Via hooks | Via hooks | N/A | 6 native tools |
| **MCP Servers** | 14 | Shared (mcp.json) | 7 (auto-merged via TOML parser) | Full |
| **Config Format** | settings.json | hooks.json + rules/ | config.toml | opencode.json |
| **Context File** | CLAUDE.md + AGENTS.md | AGENTS.md | AGENTS.md | AGENTS.md |
| **Secret Detection** | Hook-based | beforeSubmitPrompt hook | Sandbox-based | Hook-based |
| **Auto-Format** | PostToolUse hook | afterFileEdit hook | N/A | file.edited hook |
| **Version** | Plugin | Plugin | Reference config | 2.0.0-rc.1 |
| Feature | Claude Code | Cursor IDE | Codex CLI | OpenCode | GitHub Copilot |
|---------|------------|------------|-----------|----------|----------------|
| **Agents** | 60 | Shared (AGENTS.md) | Shared (AGENTS.md) | 12 | N/A |
| **Commands** | 75 | Shared | Instruction-based | 35 | 6 prompts |
| **Skills** | 228 | Shared | 10 (native format) | 37 | Via instructions |
| **Hook Events** | 8 types | 15 types | None yet | 11 types | None |
| **Hook Scripts** | 20+ scripts | 16 scripts (DRY adapter) | N/A | Plugin hooks | N/A |
| **Rules** | 34 (common + lang) | 34 (YAML frontmatter) | Instruction-based | 13 instructions | 1 always-on file |
| **Custom Tools** | Via hooks | Via hooks | N/A | 6 native tools | N/A |
| **MCP Servers** | 14 | Shared (mcp.json) | 7 (auto-merged via TOML parser) | Full | N/A |
| **Config Format** | settings.json | hooks.json + rules/ | config.toml | opencode.json | copilot-instructions.md + settings.json |
| **Context File** | CLAUDE.md + AGENTS.md | AGENTS.md | AGENTS.md | AGENTS.md | copilot-instructions.md |
| **Secret Detection** | Hook-based | beforeSubmitPrompt hook | Sandbox-based | Hook-based | Instruction-based |
| **Auto-Format** | PostToolUse hook | afterFileEdit hook | N/A | file.edited hook | N/A |
| **Version** | Plugin | Plugin | Reference config | 2.0.0-rc.1 | Instruction layer |
**Key architectural decisions:**
- **AGENTS.md** at root is the universal cross-tool file (read by all 4 tools)
- **AGENTS.md** at root is the universal cross-tool file (read by Claude Code, Cursor, Codex, and OpenCode — GitHub Copilot uses `.github/copilot-instructions.md` instead)
- **DRY adapter pattern** lets Cursor reuse Claude Code's hook scripts without duplication
- **Skills format** (SKILL.md with YAML frontmatter) works across Claude Code, Codex, and OpenCode
- Codex's lack of hooks is compensated by `AGENTS.md`, optional `model_instructions_file` overrides, and sandbox permissions