Agent Plugins for AI Coding Agents

Executable discipline for AI coding agents (Claude Code, Cursor, Copilot,
Gemini CLI, OpenCode, Codex) - skills the agent loads on demand and applies
while it works, not prose guides it ignores.

Agent Plugins is a plugin marketplace for Claude Code and OpenAI Codex.

Install

npx skills - recommended for any Agent Skills host

Works with any compatible agent (Claude Code, Cursor, Copilot, Gemini CLI, OpenCode, Codex, and more). Each command is independent - run the one(s) you want:

# code-intelligence (this repo's inline skill)
npx skills add https://github.com/antonbabenko/agent-plugins

# terraform-skill (its own repo)
npx skills add https://github.com/antonbabenko/terraform-skill

Claude Code

/plugin marketplace add antonbabenko/agent-plugins

/plugin install code-intelligence@antonbabenko
/plugin install terraform-skill@antonbabenko
/plugin install claude-delegator@antonbabenko

Codex

codex plugin marketplace add antonbabenko/agent-plugins

Then run codex, open /plugins, select Agent Plugins, and install
code-intelligence, terraform-skill, or claude-delegator.

For other hosts, expand below.

Gemini CLI

External plugin (terraform-skill) installs as an extension from its own repo:

gemini extensions install https://github.com/antonbabenko/terraform-skill

The inline code-intelligence has no standalone repo. Clone the Agent Plugins
repo and point Gemini at plugins/code-intelligence per Gemini's
skill-discovery docs, or install it through Claude Code or Codex.

Cursor

# external plugin (terraform-skill) - from its own repo
git clone https://github.com/antonbabenko/terraform-skill.git ~/.cursor/skills/terraform-skill

# inline plugin (code-intelligence) - from this repo
git clone https://github.com/antonbabenko/agent-plugins.git
ln -s "$(pwd)/agent-plugins/plugins/code-intelligence" ~/.cursor/skills/code-intelligence

Cursor auto-discovers skills from .agents/skills/ and .cursor/skills/.

Copilot

git clone https://github.com/antonbabenko/terraform-skill.git ~/.copilot/skills/terraform-skill
git clone https://github.com/antonbabenko/agent-plugins.git
ln -s "$(pwd)/agent-plugins/plugins/code-intelligence" ~/.copilot/skills/code-intelligence

Copilot auto-discovers skills from .copilot/skills/.

OpenCode

git clone https://github.com/antonbabenko/terraform-skill.git ~/.agents/skills/terraform-skill
git clone https://github.com/antonbabenko/agent-plugins.git
ln -s "$(pwd)/agent-plugins/plugins/code-intelligence" ~/.agents/skills/code-intelligence

OpenCode auto-discovers skills from .agents/skills/, .opencode/skills/, and
.claude/skills/.

Codex (OpenAI) - clone fallback

Prefer the Codex marketplace block above. Plain skills-directory fallback:

git clone https://github.com/antonbabenko/terraform-skill.git ~/.agents/skills/terraform-skill
git clone https://github.com/antonbabenko/agent-plugins.git
ln -s "$(pwd)/agent-plugins/plugins/code-intelligence" ~/.agents/skills/code-intelligence

Codex auto-discovers skills from ~/.agents/skills/ and .agents/skills/.
Update with git pull in each clone.

Antigravity

git clone https://github.com/antonbabenko/terraform-skill.git ~/.antigravity/skills/terraform-skill
git clone https://github.com/antonbabenko/agent-plugins.git
ln -s "$(pwd)/agent-plugins/plugins/code-intelligence" ~/.antigravity/skills/code-intelligence

Update with git pull in each clone.

Manual (Claude Code - symlink a local clone)

git clone https://github.com/antonbabenko/agent-plugins.git
mkdir -p ~/.claude/plugins
# inline plugins live under plugins/<name>/
ln -s "$(pwd)/agent-plugins/plugins/code-intelligence" ~/.claude/plugins/code-intelligence

Claude Code autodiscovers skills/<name>/SKILL.md on next launch. Edits to the
clone are picked up live. External plugins (e.g. terraform-skill) are not in
this repo - install them from their own repo instead.

Plugins

code-intelligence

Stops blind text-replace renames and "the tool is broken" guesses: the agent picks language-server vs text vs fuzzy search correctly for the task, and says so on the first line when it has to swap one tool for another.

tldr - what changes with the plugin:

Prompt	Without the plugin	With the plugin
Rename var.tags to var.resource_tags across the module	Blind grep/replace - misses position scoping, collides with same-named symbols in child modules, no post-edit validate	terraform-ls has no rename provider, so it runs the safe manual workflow: findReferences at an anchored position -> fresh per-file Read -> edit -> validate
Find every reference to aws_s3_bucket.this before changing it	One regex; may over/under-match, then claims "found all"	Position-anchored findReferences; on an uninitialized workspace it says so on line 1 and discloses the rg fallback
rg looks missing so the agent reaches for grep	Silent tool swap - you never learn coverage dropped	Proves the tool is really absent first; states the substitution on the first line

The semantic rows above need a language server installed (here terraform-ls).
Without one the plugin still helps: it discloses the rg fallback on the first
line instead of pretending the text search was exhaustive. Check your setup
with /code-intelligence:setup-code-intelligence.

/plugin install code-intelligence@antonbabenko

Try:

• I need to change var.vpc_id - what references it?
• Where does local.name_prefix come from?
• What can I set on this aws_s3_bucket resource?
• Is output.cluster_endpoint used anywhere before I change its type?
• Did you really find all the references, or just text matches?

Check your setup (Claude Code): /code-intelligence:setup-code-intelligence

terraform-skill

Routes a Terraform or OpenTofu request to its real failure mode - identity churn, secret exposure, blast radius, state corruption - before generating code, instead of emitting plausible-looking HCL that breaks on apply.

tldr - what changes with the plugin:

Prompt	Without the plugin	With the plugin
Create a VPC module	Plausible HCL, no tests, no version guards	Routes to the failure mode first; module + native tests + version-aware guards
Configure S3 backend with state locking	May emit DynamoDB locking (outdated)	TF 1.10+ S3 native use_lockfile; flags DynamoDB as no longer required
Change a resource's address	Text rename -> destroy/recreate on apply	moved block + plan shows 0 destroy; blast radius checked before generating code

/plugin install terraform-skill@antonbabenko
# or, on any Agent Skills host:
npx skills add https://github.com/antonbabenko/terraform-skill

Try:

• Create a VPC module with native tests
• Configure S3 backend with state locking

Source and detail: github.com/antonbabenko/terraform-skill.
The full per-host install list lives in that repo's README.

claude-delegator

Gives the agent five GPT (Codex) and/or Gemini expert subagents - it
delegates the hard call (architecture, plan review, scope, code review,
security) instead of guessing alone, and synthesizes the result rather than
pasting it raw.

tldr - what changes with the plugin:

Prompt	Without the plugin	With the plugin
Is this auth flow secure?	One model's single take	Security Analyst expert reviews; verdict synthesized, not raw
Review this migration plan	Self-review, same blind spots	Plan Reviewer expert validates before you execute
Get GPT and Gemini to agree on this design	Manual back-and-forth	consensus iterates GPT + Gemini + Claude to a signed-off plan

Each expert runs advisory (read-only) or implementation (workspace-write).
Maintained fork of jarrodwatts/claude-delegator (upstream inactive); MIT.

/plugin install claude-delegator@antonbabenko
/claude-delegator:setup

Requires the Codex CLI and/or
Gemini CLI; /setup guides you through
it.

Bundled commands:

• /claude-delegator:setup - configure Codex/Gemini MCP servers + rules
• /claude-delegator:uninstall - remove MCP config, rules, and aliases
• /claude-delegator:ask-gpt - one-shot GPT (Codex) second opinion
• /claude-delegator:ask-gemini - one-shot Gemini second opinion
• /claude-delegator:ask-both - GPT + Gemini in parallel, synthesized
• /claude-delegator:consensus - iterate GPT + Gemini + Claude to consensus

Use consensus when the plan must be right - GPT + Gemini + Claude iterate
until all three sign off, ideal for high-stakes planning and design. Use the
ask-* commands for a quicker single or parallel opinion when you just want a
fast second take.

/setup can also install short aliases (/ask-gpt, /ask-gemini,
/ask-both, /consensus); opt-in, never overwrites an existing command.

Source and detail: github.com/antonbabenko/claude-delegator.

Why these plugins

• Honest by construction. Any tool substitution or skipped step is stated
  on the first line of the response, so you can trust what the agent reports.
• Token-lean. A short SKILL.md routes to reference files that load only
  when the task needs them. The agent does not carry the whole guide in
  context.
• Portable. One discipline across Claude Code, Cursor, Copilot, Gemini CLI,
  OpenCode, and Codex, with no per-host retraining.
• Composable and pinned. Generic skills give the base discipline; domain
  skills extend it. Each plugin is released independently, so upgrading one
  never moves another.

Author

Built and maintained by Anton Babenko - LinkedIn, X/Twitter.

Contributing

The model and the test requirements are in CONTRIBUTING.md.

License

Apache 2.0. See LICENSE.