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Tabish Bidiwale b3d31d224d feat: add GitHub Copilot slash command support (#128)
* feat: add GitHub Copilot slash command support

Add GitHub Copilot as a natively supported AI tool with custom slash
commands for OpenSpec workflow operations. This enables teams using
GitHub Copilot to access /openspec-proposal, /openspec-apply, and
/openspec-archive directly from Copilot's chat interface.

Implementation:
- Create GitHubCopilotSlashCommandConfigurator that writes prompts to
  .github/prompts/ directory with YAML frontmatter and $ARGUMENTS
  placeholder following GitHub Copilot's prompt format
- Register GitHub Copilot in AI_TOOLS configuration and slash
  command registry for automatic init/update integration
- Add comprehensive test coverage for prompt generation, updates,
  and extend mode detection
- Update documentation (README and CHANGELOG) to include GitHub
  Copilot in the slash-command support table

The implementation follows the existing SlashCommandConfigurator
pattern and integrates seamlessly with openspec init and openspec
update commands.

* docs: remove GitHub Copilot from tools list
2025-10-09 02:23:42 +11:00

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Markdown

## MODIFIED Requirements
### Requirement: Slash Command Configuration
The init command SHALL generate slash command files for supported editors using shared templates.
#### Scenario: Generating slash commands for Claude Code
- **WHEN** the user selects Claude Code during initialization
- **THEN** create `.claude/commands/openspec/proposal.md`, `.claude/commands/openspec/apply.md`, and `.claude/commands/openspec/archive.md`
- **AND** populate each file from shared templates so command text matches other tools
- **AND** each template includes instructions for the relevant OpenSpec workflow stage
#### Scenario: Generating slash commands for Cursor
- **WHEN** the user selects Cursor during initialization
- **THEN** create `.cursor/commands/openspec-proposal.md`, `.cursor/commands/openspec-apply.md`, and `.cursor/commands/openspec-archive.md`
- **AND** populate each file from shared templates so command text matches other tools
- **AND** each template includes instructions for the relevant OpenSpec workflow stage
#### Scenario: Generating slash commands for OpenCode
- **WHEN** the user selects OpenCode during initialization
- **THEN** create `.opencode/commands/openspec-proposal.md`, `.opencode/commands/openspec-apply.md`, and `.opencode/commands/openspec-archive.md`
- **AND** populate each file from shared templates so command text matches other tools
- **AND** each template includes instructions for the relevant OpenSpec workflow stage
#### Scenario: Generating slash commands for GitHub Copilot
- **WHEN** the user selects GitHub Copilot during initialization
- **THEN** create `.github/prompts/openspec-proposal.prompt.md`, `.github/prompts/openspec-apply.prompt.md`, and `.github/prompts/openspec-archive.prompt.md`
- **AND** populate each file with YAML frontmatter containing a `description` field that summarizes the workflow stage
- **AND** include `$ARGUMENTS` placeholder to capture user input
- **AND** wrap the shared template body with OpenSpec markers so `openspec update` can refresh the content
- **AND** each template includes instructions for the relevant OpenSpec workflow stage