devantler-tech/agent-plugins

A tool-neutral agent-plugin marketplace that bundles curated agent skills — sourced from across the agent-skill ecosystem — into category-based plugins.

Supports VS Code, GitHub Copilot CLI, and Claude Code via dual marketplace manifests.

Scope

This is a tool-neutral plugin marketplace, not a skills-only bundler. Every plugin published today bundles agent skills, but a plugin may bundle any agent resource — skills, MCP servers, and custom agents — so the marketplace can grow with the cross-tool agent ecosystem instead of being pinned to one tool or one resource type. Additional resource types are added as they prove out across the supported tools.

Plugins

Plugin	Resources	Description
gitops-kubernetes	gitops-cluster-debug, gitops-knowledge, gitops-repo-audit, gitops-tenant-onboarding (skills) · flux-operator-mcp (MCP server) · flux-troubleshooter (agent)	Flux CD debugging, knowledge, repository auditing, and tenant onboarding — bundles the Flux MCP server and a read-only Flux troubleshooter agent for live-cluster debugging
github	gh-cli, gh-stack, github-actions-docs, github-issues	GitHub CLI, stacked PRs, Actions docs, and issue management
agentic-engineering	agent-instructions, copilot-instructions-blueprint-generator, copilot-sdk, find-skills	Agentic AI framework SDKs, AI-assistant instruction authoring, and skill discovery
go	golang-pro	Go best practices, concurrency, generics, interfaces, and testing
engineering-practices	conventional-release, git-commit, refactor, test-driven-development, ways-of-working	Git commits, conventional releases, refactoring, TDD, and engineering ways of working
frontend-design	astro, frontend-design, web-design-guidelines	Astro, frontend design, and web design guidelines

Installation

VS Code

Add the marketplace to your settings:

// settings.json
"chat.plugins.marketplaces": [
    "devantler-tech/agent-plugins"
]

Then browse Extensions → Agent Plugins (@agentPlugins search) to install individual plugins.

Copilot CLI

# Browse available plugins
copilot plugin marketplace browse devantler-tech/agent-plugins

# Install a plugin
copilot plugin install gitops-kubernetes@devantler-plugins

Claude Code

Add the marketplace, then install a plugin — run these inside Claude Code:

/plugin marketplace add devantler-tech/agent-plugins
/plugin install gitops-kubernetes@devantler-plugins

Browse everything on offer with /plugin (Discover tab) or list it with /plugin list. The bundled .claude-plugin/marketplace.json is also discovered automatically when this repo is added as a plugin source.

MCP servers

A plugin may bundle MCP servers as well as skills. The gitops-kubernetes plugin bundles the Flux MCP server (flux-operator-mcp) so its gitops-cluster-debug skill — which Requires flux-operator-mcp — works against a live cluster out of the box.

The server is authored once as the plugin's .mcp.json (mcpServers map). How each tool consumes it differs (per ADR 0001):

• Claude Code and Copilot CLI — the bundled .mcp.json is loaded automatically when the plugin is installed; no extra configuration is needed.

• VS Code consumes MCP but does not bundle it from a plugin. Add the equivalent entry to your workspace .vscode/mcp.json (note the key is servers, not mcpServers):

  {
    "servers": {
      "flux-operator-mcp": { "command": "flux-operator-mcp", "args": ["serve"] }
    }
  }

All three paths invoke the same flux-operator-mcp binary, so install it first — e.g. brew install controlplaneio-fluxcd/tap/flux-operator-mcp or go install github.com/controlplaneio-fluxcd/flux-operator/cmd/mcp@latest (it reads your kubeconfig from KUBECONFIG / ~/.kube/config). See the Flux MCP docs for read-only mode and remote transport.

Custom agents

A plugin may also bundle custom agents (subagents). The gitops-kubernetes plugin bundles flux-troubleshooter — a read-only Flux CD triage agent that traces the GitOps dependency chain (source → Kustomization/HelmRelease → workloads), reads status conditions and controller logs via the bundled flux-operator-mcp server, and returns a root-cause diagnosis plus the human-applied fix. It has no apply/reconcile/suspend/ delete tool by design, so it never mutates the cluster.

The agent is authored once as agents/<name>.md (Markdown + YAML frontmatter, with the neutral name/description/tools/model core). How each tool consumes it differs (per ADR 0001):

• Claude Code and Copilot CLI — the bundled agents/ directory is loaded automatically when the plugin is installed; the agent is namespaced gitops-kubernetes:flux-troubleshooter. (Copilot reads the same file as *.agent.md.)
• VS Code consumes agents but does not bundle them from a plugin. Copy the agent to your workspace as .github/agents/flux-troubleshooter.agent.md.

How it works

Skills are installed from their upstream repositories using gh skill install. A daily update workflow runs gh skill update --all via the update-agent-skills reusable workflow and opens a PR when upstream content has drifted.

Each plugin directory is self-contained with a plugin.json manifest and its bundled resources — a skills/ subdirectory holding the installed SKILL.md files (plus any supporting assets), and optionally an .mcp.json declaring bundled MCP servers and an agents/ directory holding custom agents. Each SKILL.md contains metadata.github-* frontmatter for upstream provenance — no lockfile needed.

Each bundled skill is pulled from its own upstream (recorded in its SKILL.md metadata.github-* frontmatter), spanning many sources — including our in-house sibling library devantler-tech/agent-skills.

Contributing

See the devantler-tech organisation guidelines for PR/issue templates and contribution rules.

License

Apache 2.0 — see LICENSE.