Claude Skills for Copilot

GitHub Copilot agent skills adapted from Anthropic Claude plugins and OpenAI Codex Skills.

Skills

Skill	Description	Source
/code-review	Multi-agent code review: bugs, security, conventions-file violations	Anthropic
/code-simplifier	Simplify and refine code for clarity and maintainability	Anthropic
/comment-analyzer	Detect comment rot and misleading documentation	Anthropic
/conventions-improver	Audit and improve AGENTS.md/CLAUDE.md/GEMINI.md quality	Anthropic
/feature-dev	Guided feature development with architecture design and review	Anthropic
/frontend-design	Create production-grade frontend interfaces with high design quality	Anthropic
/frontend-layout	Art-direction-led composition for landing pages and app UI	OpenAI
/gh-address-comments	Fetch PR review comments and address the selected ones via gh CLI	OpenAI
/gh-fix-ci	Debug failing GitHub Actions CI checks and fix after approval	OpenAI
/mcp-server-dev	Guide building MCP servers: deployment model, tool patterns, scaffold	Anthropic
/review-toolkit	Orchestrated end-to-end review (up to 6 specialist sub-skills)	Anthropic
/security-threat-model	AppSec-grade threat model: trust boundaries, abuse paths, mitigations	OpenAI
/silent-failure-hunter	Find silent failures, swallowed errors, and unjustified fallbacks	Anthropic
/test-analyzer	Behavioral test coverage review — gaps, not just line coverage	Anthropic
/type-design-analyzer	Type design quality: invariants, encapsulation, enforcement	Anthropic

Usage

Slash command — type / to see available skills, then select or type the skill name (e.g., /code-review).

Auto-invocation — in agent mode, Copilot automatically uses skills relevant to your task.

By instruction — explicitly tell the agent in natural language (e.g., "Please review code changes by code review skill").

Adaptation Details

Skills are adapted from two open-source repositories, both rewritten for VS Code Copilot agent skills format.

From Anthropic Claude Plugins

Source: anthropics/claude-plugins-official (Apache 2.0). The original plugins target Claude Code (CLI).

Common changes

Every skill from this source went through the following transformations:

Change	Original (Claude Code)	Adapted (VS Code Copilot)
File format	agent/command YAML frontmatter with model:, allowed-tools:	SKILL.md with name, description, argument-hint, user-invocable
Tooling	Bash(gh pr view …), TodoWrite, $ARGUMENTS	Generic VS Code Copilot tool references
Description field	Long XML <example> chat transcripts embedded in frontmatter	Single-sentence description
Convention file	CLAUDE.md	AGENTS.md or similar (CLAUDE.md, GEMINI.md) with priority AGENTS.md -> CLAUDE.md -> GEMINI.md
Model names	claude-haiku-4-5, claude-sonnet-4-5, claude-opus-4-5	Generic sub-agent references

/code-review

Source: plugins/code-review/commands/code-review.md

The original is a PR-focused command that reads the diff via gh pr diff and spawns multiple Haiku sub-agents to review different aspects. It is tightly coupled to GitHub workflow — it requires an open PR and the gh CLI.

Changes:

• Removed all gh CLI usage; the skill now works on any file, directory, diff, or codebase passed as an argument
• Replaced named Anthropic model invocations with generic sub-agent calls
• Replaced single-file CLAUDE.md convention lookup with AGENTS.md or similar conventions files (CLAUDE.md, GEMINI.md) in priority order: AGENTS.md -> CLAUDE.md -> GEMINI.md

---

/code-simplifier

Source: plugins/code-simplifier/agents/code-simplifier.md

The original agent is scoped to "recently modified files" and references Anthropic-internal project conventions (ES modules, arrow functions, specific test patterns). The model: claude-opus-4-5 instruction makes it a high-quality but heavyweight agent.

Changes:

• Removed hardcoded project-specific coding standards from the prompt body
• Broadened scope from "recently modified code" to any file, diff, or codebase segment specified by the user
• Converted from agent (with model:) to a skill

---

/comment-analyzer

Source: plugins/pr-review-toolkit/agents/comment-analyzer.md

The original agent embeds lengthy XML <example> transcripts inside the description frontmatter field to illustrate expected output. The body mixes free-form instruction with example scenarios.

Changes:

• Stripped all XML examples from the frontmatter description
• Restructured the body as a numbered analysis framework (accuracy verification → completeness assessment → long-term value evaluation → misleading element identification)
• Added argument-hint for user-facing guidance

---

/conventions-improver

Source: plugins/claude-md-management/skills/claude-md-improver/SKILL.md

The original skill audits and improves CLAUDE.md files in Claude Code projects. It references Claude Code–specific file types (.claude.local.md, ~/.claude/CLAUDE.md), the # key shortcut for incorporating learnings, and uses tool declarations (Read, Glob, Grep, Bash, Edit). Quality criteria and templates are stored in separate references/ files.

Changes:

• Renamed from claude-md-improver to conventions-improver to reflect the broader scope
• Generalised from CLAUDE.md-only to support AGENTS.md, CLAUDE.md, and GEMINI.md with priority order AGENTS.md -> CLAUDE.md -> GEMINI.md
• Removed Claude Code–specific file types (.claude.local.md, global ~/.claude/CLAUDE.md, the # shortcut tip)
• Removed tool declarations from YAML frontmatter
• Embedded quality-criteria and templates content inline (single self-contained SKILL.md rather than split across references/ files)

---

/feature-dev

Source: plugins/feature-dev/commands/feature-dev.md

The original command uses the Claude Code–specific TodoWrite built-in tool to manage a persistent task list, and receives the feature description via the $ARGUMENTS shell variable.

Changes:

• Replaced TodoWrite invocations with a generic "maintain a todo list" instruction
• Replaced $ARGUMENTS with a natural-language argument hint in the frontmatter
• Converted from command to skill format

---

/frontend-design

Source: plugins/frontend-design/skills/frontend-design/SKILL.md

This is the closest to a direct port — the source is already a SKILL.md intended for the Claude Code skill system, which shares a similar format to VS Code Copilot skills.

Changes:

• Removed the license: Complete terms in LICENSE.txt frontmatter field (not used by VS Code Copilot)
• Added argument-hint and user-invocable: true frontmatter fields
• Minor formatting normalisation (bullet indentation)

---

/review-toolkit

Sources:

• plugins/pr-review-toolkit/commands/review-pr.md — orchestrator command
• plugins/pr-review-toolkit/agents/ — 6 specialist agent files (code-reviewer, silent-failure-hunter, comment-analyzer, pr-test-analyzer, code-simplifier, type-design-analyzer)

The original is a PR review orchestrator: it reads a PR with gh pr view, then spawns the 6 specialist agents by filename. Each agent file is standalone and referenced by path.

Changes:

• Completely rewritten: dispatches the other 5 Copilot skills (not agent files) by skill name
• Removed all PR/GitHub context; works on any codebase, directory, or diff
• Replaced gh pr view with instructions to infer scope from argument or current workspace
• Added a summary table format for the final aggregated report

---

/silent-failure-hunter

Source: plugins/pr-review-toolkit/agents/silent-failure-hunter.md

The original agent has an extensive description field with XML <example> blocks showing sample review dialogues. The body defines detection patterns for swallowed errors and missing fallbacks.

Changes:

• Stripped XML examples from the frontmatter description
• Restructured the body as a numbered review process (identify error handling → scrutinize each handler → check for hidden failure patterns)
• Added argument-hint for user-facing guidance

---

/test-analyzer

Source: plugins/pr-review-toolkit/agents/pr-test-analyzer.md

The original is named pr-test-analyzer and is framed around reviewing tests in the context of a pull request diff. It focuses on whether new tests were added for changed code.

Changes:

• Renamed from pr-test-analyzer to test-analyzer to reflect the broader, non-PR scope
• Removed all PR framing; the skill now reviews any test file, directory, or codebase
• Added DAMP (Descriptive And Meaningful Phrases) principles as an explicit evaluation criterion
• Added argument-hint for user-facing guidance

---

/type-design-analyzer

Source: plugins/pr-review-toolkit/agents/type-design-analyzer.md

The original agent has an informal instruction style and uses XML <example> transcripts in its description to illustrate expected output quality.

Changes:

• Replaced verbose description with a single-sentence summary
• Reformatted the analysis framework as numbered steps with a 4-dimension rating rubric (invariants, encapsulation, enforcement, expressiveness; each scored 1–10)
• Added argument-hint for user-facing guidance

---

/mcp-server-dev

Source: plugins/mcp-server-dev/skills/build-mcp-server/SKILL.md

The original skill is structured around Claude Code's tool ecosystem and references six companion references/ files (remote-http-scaffold, deploy-cloudflare-workers, tool-design, auth, elicitation, server-capabilities). It also hands off to two peer skills (build-mcp-app, build-mcpb) that exist in the same plugin but are not yet adapted.

Changes:

• Renamed from build-mcp-server to mcp-server-dev to match the parent plugin name and our naming convention
• Removed version: frontmatter field (not used by VS Code Copilot)
• Added argument-hint and user-invocable: true frontmatter fields
• Removed all references/xxx.md internal file pointers; Phase 5 now includes inline scaffolding guidance for each deployment path, and replaced the References section with links to public MCP SDK repositories and the MCP specification
• Removed hand-off instructions for build-mcp-app and build-mcpb (those sub-skills don't exist in this repo); replaced with inline guidance to continue implementing the chosen approach

---

From OpenAI Codex Skills

Source: openai/skills (Apache 2.0 per-skill). The original skills target the OpenAI Codex agent.

Common changes

Change	Original (OpenAI Codex)	Adapted (VS Code Copilot)
File format	Separate agents/openai.yaml for UI config (display name, icons, prompt)	Removed; argument-hint and user-invocable: true added to SKILL.md
Bundled scripts	Python scripts/ helpers called by the workflow (gh-fix-ci, gh-address-comments)	Replaced with inline gh CLI commands
Reference files	Companion references/ files carrying output contracts and guidance (security-threat-model)	Inlined into SKILL.md
Platform-specific	create-plan skill, sandbox_permissions=require_escalated auth commands	Removed

/gh-address-comments

Source: skills/.curated/gh-address-comments/SKILL.md

The original skill uses a bundled Python script (scripts/fetch_comments.py) to fetch PR comments via the GitHub GraphQL API. It also refers to OpenAI Codex–specific auth sandbox commands (sandbox_permissions=require_escalated).

Changes:

• Replaced the Python script call with an inline gh api graphql command block that fetches conversation comments, reviews, and review threads directly
• Added a REST fallback (gh pr view --json reviews,comments) for environments where GraphQL is unavailable
• Removed Codex sandbox-specific auth instructions
• Added argument-hint and user-invocable: true frontmatter fields

---

/gh-fix-ci

Source: skills/.curated/gh-fix-ci/SKILL.md

The original skill orchestrates a Python script (scripts/inspect_pr_checks.py, 509 lines) to fetch failing check logs. It also references the Codex-specific create-plan skill for the approval step.

Changes:

• Replaced the Python script call with the manual gh CLI commands already present in the original as a fallback (the script is a convenience wrapper around the same gh run view and gh api calls)
• Replaced create-plan skill invocation with an inline plan-and-approval step
• Removed Codex sandbox-specific auth instructions
• Added argument-hint and user-invocable: true frontmatter fields

---

/security-threat-model

Source: skills/.curated/security-threat-model/SKILL.md

The original skill references two companion files (references/prompt-template.md and references/security-controls-and-assets.md) that carry the output contract and quality rules.

Changes:

• Inlined the output format contract and evidence-grounding rules from prompt-template.md directly into SKILL.md (VS Code skills support only a single SKILL.md file)
• Inlined the Mermaid diagram rules and required output section list
• Removed references to the separate references/ directory
• Added argument-hint and user-invocable: true frontmatter fields

---

/frontend-layout

Source: skills/.curated/frontend-skill/SKILL.md

The original skill is already in SKILL.md format and focuses on art direction, composition restraint, and image-led hierarchy — complementing the existing /frontend-design skill which emphasises bold aesthetic direction.

Changes:

• Renamed from frontend-skill to frontend-layout to clarify the complementary scope alongside the existing frontend-design skill
• Added argument-hint and user-invocable: true frontmatter fields
• Minor formatting normalisation (table alignment, bullet indentation)

License

This project is licensed under MIT.

Portions of the skill definitions are adapted from claude-plugins-official by Anthropic and from openai/skills by OpenAI, both licensed under the Apache License 2.0. Changes were made to adapt the content to VS Code Copilot agent skills format.