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Add arch plugin (architecture + modernization skills) (#2253)

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* Add arch plugin (architecture + modernization skills)

Add the `arch` plugin with two skills:
- `arch:document` — produce a single, cited architecture document for a
  locally-cloned repo, reading files on disk only.
- `arch:modernize` — generate a phased modernization plan, auto-running the
  document workflow first when no architecture doc exists.

Skill sources live in top-level skills/ and are referenced declaratively
from plugins/arch/.github/plugin/plugin.json, per the repo's plugin model.
Regenerated docs/README.plugins.md, docs/README.skills.md and marketplace.json.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Merge arch skills into single doc-and-modernize skill

Collapse the document and modernize skills into one standalone skill
(doc-and-modernize) with Documentation and Modernization modes, keeping
the plugin named arch. Modernization mode now runs the Documentation
workflow inline instead of invoking a separate arch:document skill,
fixing standalone-install cross-skill references. Reframe Documentation
mode as local-first (remote/API lookups are a flagged last resort)
rather than local-only. Regenerate docs and marketplace.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address PR review: list skill by bare ID in arch README

Use 'doc-and-modernize' (repo convention) instead of the namespaced
'arch:doc-and-modernize', noting it surfaces as arch:doc-and-modernize
when installed via the plugin.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address PR review: use non-HTML placeholder in instructions template

Change plain-text <PROJECT NAME> to [PROJECT NAME] in the header and
first paragraph so Markdown renderers don't parse it as an HTML tag and
drop it. The code-span `<N>` on the phase line is unaffected.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address PR review + fix codespell CI failure

- Fix codespell: pre-empts -> preempts in the instructions template
- Consistent terminology: replace 'research step/workflow' with
  'Documentation mode' in SKILL.md, README, and plugin.json description
- Fix run-on: add 'that' before 'Modernization mode must surface'
- Regenerate docs/marketplace for the updated plugin description

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address PR review feedback

- Instruct redacting credentials/tokens from git remote URLs before recording
- CI enforcement: ask user or mark [UNVERIFIED]; remote lookup is flagged last resort

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: samqbush <samqbush@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
samqbush
2026-07-09 18:30:32 -06:00
committed by GitHub
parent 2b8b7b2fd1
commit aa99d75baa
8 changed files with 1326 additions and 0 deletions
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docs/README.plugins.md
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@@ -29,6 +29,7 @@ See [CONTRIBUTING.md](../CONTRIBUTING.md#adding-plugins) for guidelines on how t
| ---- | ----------- | ----- | ---- |
| [acreadiness-cockpit](../plugins/acreadiness-cockpit/README.md) | Drive Microsoft AgentRC from Copilot chat: assess AI readiness, generate Copilot instructions (flat or nested with applyTo globs for monorepos), and manage policies. Produces a self-contained static HTML dashboard at reports/index.html. | 4 items | agentrc, ai-readiness, copilot-instructions, readiness-report, monorepo, policy, dashboard |
| [ai-team-orchestration](../plugins/ai-team-orchestration/README.md) | Bootstrap and run a multi-agent AI development team with named roles (Producer, Dev Team, QA). Sprint planning, brainstorm prompts with distinct agent voices, cross-chat context survival, and parallel team workflows. Based on a proven template that shipped a 30-game app in 5 days with zero human-written code. | 4 items | ai-team, multi-agent, sprint-planning, brainstorm, project-management, orchestration, developer-workflow |
| [arch](../plugins/arch/README.md) | Architecture and modernization toolkit: produce a cited architecture document for a locally-cloned repo, and generate a phased modernization plan that auto-runs Documentation mode when needed. | 1 items | architecture, modernization, documentation, migration, onboarding |
| [arize-ax](../plugins/arize-ax/README.md) | Arize AX platform skills for LLM observability, evaluation, and optimization. Includes trace export, instrumentation, datasets, experiments, evaluators, AI provider integrations, annotations, prompt optimization, and deep linking to the Arize UI. | 9 items | arize, llm, observability, tracing, evaluation, instrumentation, datasets, experiments, prompt-optimization |
| [automate-this](../plugins/automate-this/README.md) | Record your screen doing a manual process, drop the video on your Desktop, and let Copilot CLI analyze it frame-by-frame to build working automation scripts. Supports narrated recordings with audio transcription. | 1 items | automation, screen-recording, workflow, video-analysis, process-automation, scripting, productivity, copilot-cli |
| [awesome-copilot](../plugins/awesome-copilot/README.md) | Meta prompts that help you discover and generate curated GitHub Copilot agents, instructions, prompts, and skills. | 4 items | github-copilot, discovery, meta, prompt-engineering, agents |
docs/README.skills.md
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@@ -143,6 +143,7 @@ See [CONTRIBUTING.md](../CONTRIBUTING.md#adding-skills) for guidelines on how to
| [dependabot](../skills/dependabot/SKILL.md)<br />`gh skills install github/awesome-copilot dependabot` | Comprehensive guide for configuring and managing GitHub Dependabot. Use this skill when users ask about creating or optimizing dependabot.yml files, managing Dependabot pull requests, configuring dependency update strategies, setting up grouped updates, monorepo patterns, multi-ecosystem groups, security update configuration, auto-triage rules, or any GitHub Advanced Security (GHAS) supply chain security topic related to Dependabot. For pre-commit dependency vulnerability scanning in AI coding agents via the GitHub MCP Server, this skill references the Advanced Security plugin (`advanced-security@copilot-plugins`). Use this skill when an agent needs to scan dependencies for known vulnerabilities before committing. | `references/dependabot-yml-reference.md`<br />`references/example-configs.md`<br />`references/pr-commands.md` |
| [devops-rollout-plan](../skills/devops-rollout-plan/SKILL.md)<br />`gh skills install github/awesome-copilot devops-rollout-plan` | Generate comprehensive rollout plans with preflight checks, step-by-step deployment, verification signals, rollback procedures, and communication plans for infrastructure and application changes | None |
| [diagnose](../skills/diagnose/SKILL.md)<br />`gh skills install github/awesome-copilot diagnose` | Perform a systematic diagnostic scan of an AI workflow across 5 quality dimensions — prompt quality, context efficiency, tool health, architecture fitness, and safety — producing a scored report with prioritized remediation actions. | None |
| [doc-and-modernize](../skills/doc-and-modernize/SKILL.md)<br />`gh skills install github/awesome-copilot doc-and-modernize` | Two related workflows for a locally-cloned codebase, in one skill. Documentation mode produces a single, comprehensive, verifiable architecture document primarily by reading files on disk (local-first) — use it whenever the user wants to understand, map, document, research, or onboard onto a codebase ("research this repo", "write up the architecture", "do an architecture deep dive", "document how this codebase works", "map the system design", "create an onboarding doc"). Modernization mode generates a phased plan to modernize, migrate, upgrade, or rewrite a legacy system ("modernize this", "plan the migration", "how would we rewrite this", "how do we get off this legacy stack"); if no architecture document exists yet it first runs Documentation mode, then continues straight through to the plan. It assumes the legacy stack may be dead, runs a time-boxed feasibility spike, and picks the highest achievable rung on a safety ladder instead of demanding a fully-green legacy CI gate up front. | `references/copilot-instructions.template.md`<br />`references/migration-hazards.md` |
| [documentation-writer](../skills/documentation-writer/SKILL.md)<br />`gh skills install github/awesome-copilot documentation-writer` | Diátaxis Documentation Expert. An expert technical writer specializing in creating high-quality software documentation, guided by the principles and structure of the Diátaxis technical documentation authoring framework. | None |
| [dotnet-best-practices](../skills/dotnet-best-practices/SKILL.md)<br />`gh skills install github/awesome-copilot dotnet-best-practices` | Ensure .NET/C# code meets best practices for the solution/project. | None |
| [dotnet-design-pattern-review](../skills/dotnet-design-pattern-review/SKILL.md)<br />`gh skills install github/awesome-copilot dotnet-design-pattern-review` | Review the C#/.NET code for design pattern implementation and suggest improvements. | None |