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Agent skill

Capability Discovery

by hashgraph-online in hashgraph-online/awesome-codex-plugins

Detect which MCP servers, Claude Code plugins, and CLI tools are available in the current environment, so kits and build sites can bind to real capabilities instead of imagined ones.

Apache-2.0Auto-check passedAgent Workflows

Install Capability Discovery

skills CLI
$ npx skills add hashgraph-online/awesome-codex-plugins --skill capability-discovery -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install hashgraph-online/awesome-codex-plugins capability-discovery --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/JuliusBrussee/blueprint/skills/capability-discovery .claude/skills/capability-discovery && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
capability-discovery
GitHub stars
1.2k
Token cost
~707 tokens
SKILL.md length
258 words
Files
1
Skills in repo
686
Repo updated
First seen
Licence
Apache-2.0

At a glance

Detect which MCP servers, Claude Code plugins, and CLI tools are available in the current environment, so kits and build sites can bind to real capabilities instead of imagined ones.

  • Phrases: what do we have available
  • SKILL.md covers What we detect, Running discovery, How other commands use it and When to re-run, plus 1 more section
  • Calls node
  • Whats installed

What it does

Capability Discovery is an agent skill from hashgraph-online/awesome-codex-plugins. Detect which MCP servers, Claude Code plugins, and CLI tools are available in the current environment, so kits and build sites can bind to real capabilities instead of imagined ones. Runs via /ck:init --tools-only or cavekit-tools.cjs discover. Writes .cavekit/capabilities.json. Trigger phrases: "what do we have available", "what's installed", "detect tools", "can we use X", "setup tools".

Its SKILL.md is about 710 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Agent Workflows, covering MCP servers. It works with Model Context Protocol. The repository describes itself as: A curated list of awesome OpenAI Codex / ChatGPT plugins, skills, and resources. The 1 Codex Marketplace. See live plugins at: https://hol.org/plugins/best-codex-plugins. The licence is Apache-2.0.

When your agent uses it

  • Phrases: what do we have available
  • Whats installed

Example prompts

  • “what do we have available”
  • “s installed”
  • “detect tools”
  • “/capability-discovery”

Requirements

  • Docker

What it can do on your machine

Read from SKILL.md and the folder at commit 78497e5. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • node

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Capability Discovery loads about 707 tokens when it runs. Until then it costs about 104 tokens; SKILL.md has 258 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~104
When it runs · the whole SKILL.md, loaded when a task matches
~707

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from hashgraph-online/awesome-codex-plugins at commit 78497e5, republished under its Apache-2.0 licence (© hashgraph-online). 258 words, ~707 tokens.

Download SKILL.mdSave it as .claude/skills/capability-discovery/SKILL.md (or your agent's skills folder).
name
capability-discovery
description
Detect which MCP servers, Claude Code plugins, and CLI tools are available in the current environment, so kits and build sites can bind to real capabilities instead of imagined ones. Runs via /ck:init --tools-only or `cavekit-tools.cjs discover`. Writes .cavekit/capabilities.json. Trigger phrases: "what do we have available", "what's installed", "detect tools", "can we use X", "setup tools".

Capability Discovery

The pipeline should never invent tools. Before drafting a kit that references GitHub Actions, Supabase, Codex, or any other external dependency, check what actually exists.

What we detect

  • CLI tools on $PATH: gh, git, node, go, rustc, cargo, python3, pip, docker, vercel, supabase, firebase, wrangler, ffmpeg, playwright, codex, graphify.
  • MCP servers: parsed from .mcp.json in the project root and ~/.claude.json (user level).
  • Claude Code plugins: parsed from ~/.claude/plugins/installed_plugins.json.
  • Codex: presence of the codex CLI (enables peer-review commands).
  • Knowledge graph: presence of graphify-out/graph.json (enables the graphify-integration skill).

Running discovery

bash
node "${CLAUDE_PLUGIN_ROOT}/scripts/cavekit-tools.cjs" discover

Writes .cavekit/capabilities.json:

json
{
  "discovered_at": "2026-04-17T14:22Z",
  "cli_tools": {
    "gh": true, "git": true, "node": true, "codex": false
  },
  "mcp_servers": ["codex-reviewer", "graphify"],
  "plugins": [],
  "codex": { "available": false }
}

How other commands use it

  • /ck:sketch — reads capabilities before proposing integrations. If a kit would need a missing tool, it either adds a "Setup" task to the build site or asks the user whether to proceed without it.
  • /ck:map — flags tasks that depend on missing capabilities as blocked: setup-required.
  • /ck:make — refuses to dispatch subagents that require a missing MCP server.
  • /ck:check — includes a "Capability Coverage" section in the inspect report.

When to re-run

  • After installing a new CLI tool.
  • After adding or removing an MCP server.
  • At the start of every new project (via /ck:init).
  • Whenever a task fails with "command not found".

The file is cheap to regenerate — always discover, never guess.

What we deliberately do not detect

  • Network-accessible APIs behind credentials. Availability is not reachability; kits should record credentials as a separate concern (never committed).
  • IDE extensions. They are not scriptable from the loop and would create false assurances.
  • Language versions. Version-pinning is the project's responsibility (package.json / go.mod / pyproject.toml); discovery only confirms executables exist.

© hashgraph-online, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in plugins/JuliusBrussee/blueprint/skills/capability-discovery of hashgraph-online/awesome-codex-plugins.

Open the folder on GitHubat commit 78497e5

Compare with similar skills

Capability Discovery next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Capability Discovery compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Capability Discovery this skillhashgraph-online/awesome-codex-plugins1.2k—~707Automated safety check: PassApache-2.0
MCP Server Builderanthropics/skills180k64 repos~2.3kAutomated safety check: PassApache-2.0
MCP Server BuildershareAI-lab/learn-claude-code78k5 repos~1.2kAutomated safety check: PassMIT
MCP Integration for Pluginsanthropics/claude-plugins-official38k11 repos~3.1kAutomated safety check: PassApache-2.0
Fastmcp Client CLIPrefectHQ/fastmcp28k1 repos~823Automated safety check: PassApache-2.0
Crush Configurationcharmbracelet/crush29k—~3.7kAutomated safety check: PassCustom licence

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Works with

Categories

Questions about Capability Discovery

What does Capability Discovery do?

Detect which MCP servers, Claude Code plugins, and CLI tools are available in the current environment, so kits and build sites can bind to real capabilities instead of imagined ones. Capability Discovery is an agent skill from hashgraph-online/awesome-codex-plugins. Detect which MCP servers, Claude Code plugins, and CLI tools are available in the current environment, so kits and build sites can bind to real capabilities instead of imagined ones.

When should I use Capability Discovery?

Capability Discovery fits situations like: phrases: what do we have available; whats installed.

How do I install Capability Discovery in Claude Code?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill capability-discovery -a claude-code`. Or copy the skill folder (plugins/JuliusBrussee/blueprint/skills/capability-discovery in hashgraph-online/awesome-codex-plugins) into .claude/skills/capability-discovery in your project. Claude Code loads it when a task matches its description.

How do I install Capability Discovery in Codex?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill capability-discovery -a codex`. Or copy the skill folder (plugins/JuliusBrussee/blueprint/skills/capability-discovery in hashgraph-online/awesome-codex-plugins) into .agents/skills/capability-discovery in your project. Codex loads it when a task matches its description.

Can I use Capability Discovery in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add hashgraph-online/awesome-codex-plugins --skill capability-discovery -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/capability-discovery, .gemini/skills/capability-discovery, .github/skills/capability-discovery and .opencode/skills/capability-discovery in your project.

What does Capability Discovery need to run?

Going by SKILL.md and its folder, Capability Discovery needs the command-line tools its instructions call (node). Our summary lists: Docker.

Does Capability Discovery access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Capability Discovery safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Capability Discovery use?

Capability Discovery is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Capability Discovery use?

About 707 tokens (SKILL.md is roughly 2.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Capability Discovery?

Skills that share tags, products or a category with Capability Discovery: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Fastmcp Client CLI (PrefectHQ/fastmcp, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Capability Discovery?

hashgraph-online (a GitHub organization) maintains it in hashgraph-online/awesome-codex-plugins, which has 1,242 GitHub stars. The repository holds 686 skills in this directory. The repository was last updated on October 8, 2026.

Source: hashgraph-online/awesome-codex-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.