chore: migrate from opencode to trellis 0.5.0-rc.6

- Remove legacy .opencode/ directory and configuration - Update .trellis/ to v0.5.0-rc.6 structure - Refactor scripts: modularize common/, remove multi_agent/ - Add new common modules: git.py, io.py, log.py, types.py, etc. - Update workflow.md and AGENTS.md - Archive completed migration tasks
2026-05-06 14:29:25 +08:00
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+# Change Local Skills, Commands, Prompts, And Workflows
+
+When the user wants to change AI entry points, auto-trigger rules, or explicit command behavior, edit skills, commands, prompts, or workflows in local platform directories.
+
+## Read These Files First
+
+1. `.trellis/workflow.md`
+2. Target platform skill/command/prompt/workflow directory
+3. Related agent or hook files
+4. Whether project rules already exist in `.trellis/spec/`
+
+## Which Entry Type To Choose
+
+| Goal | Recommendation |
+| --- | --- |
+| AI should automatically know a capability | Add or modify a skill. |
+| User wants to trigger manually with a command | Add or modify a command/prompt/workflow. |
+| Team project conventions | Prefer `.trellis/spec/` or a project-local skill. |
+| Change Trellis flow semantics | Synchronize `.trellis/workflow.md`. |
+
+## Modify A Skill
+
+A skill is usually:
+
+```text
+<skill-name>/
+├── SKILL.md
+└── references/
+```
+
+`SKILL.md` should be short and responsible for triggering/routing. Put long content in `references/` so AI can read it on demand.
+
+The frontmatter description should specify when to use the skill. Example:
+
+```yaml
+description: "Use when customizing this project's deployment workflow and release checklist."
+```
+
+Do not write vague descriptions such as "helpful project skill"; they can trigger incorrectly.
+
+## Modify A Command/Prompt/Workflow
+
+Explicit entry points should state:
+
+- How the user triggers it.
+- Which `.trellis/` files to read.
+- Which scripts to run.
+- How to report after completion.
+
+If a command only repeats workflow rules, prefer making it reference/read `.trellis/workflow.md` instead of maintaining a second copy of the flow.
+
+## Common Paths
+
+| Platform | Entry directories |
+| --- | --- |
+| Claude Code | `.claude/skills/`, `.claude/commands/` |
+| Cursor | `.cursor/skills/`, `.cursor/commands/` |
+| OpenCode | `.opencode/skills/`, `.opencode/commands/` |
+| Codex | `.agents/skills/`, `.codex/skills/` |
+| GitHub Copilot | `.github/skills/`, `.github/prompts/` |
+| Kilo / Antigravity / Windsurf | workflows + skills |
+
+## Add A Project-Local Skill
+
+If the user wants to document team-private customizations, create a project-local skill, for example:
+
+```text
+.claude/skills/project-trellis-local/
+└── SKILL.md
+```
+
+For multi-platform projects, add equivalent versions in each platform skill directory, or use `.agents/skills/` on platforms that support the shared layer.
+
+## Notes
+
+- Do not mix every platform's syntax into one file.
+- Do not change only one platform entry point while claiming all platforms are supported.
+- Do not hide long-term engineering conventions inside a command; write them to `.trellis/spec/`.