MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Run a full build-and-ship pipeline from a spec — use for hands-off project generation
$ npx skills add nyldn/claude-octopus --skill skill-factory -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install nyldn/claude-octopus skill-factory --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/nyldn/claude-octopus.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/skill-factory .claude/skills/skill-factory && rm -rf skills-srcUse ~/.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/
Install the "skill-factory" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-factory into .claude/skills/skill-factory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-factory", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/nyldn/claude-octopus/tree/main/skills/skill-factoryType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add nyldn/claude-octopus --skill skill-factory -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install nyldn/claude-octopus skill-factory --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nyldn/claude-octopus.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/skill-factory .agents/skills/skill-factory && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "skill-factory" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-factory into .agents/skills/skill-factory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-factory", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add nyldn/claude-octopus --skill skill-factory -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install nyldn/claude-octopus skill-factory --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nyldn/claude-octopus.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/skill-factory .cursor/skills/skill-factory && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "skill-factory" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-factory into .cursor/skills/skill-factory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-factory", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/nyldn/claude-octopus.git --path skills/skill-factory--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add nyldn/claude-octopus --skill skill-factory -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install nyldn/claude-octopus skill-factory --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nyldn/claude-octopus.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/skill-factory .gemini/skills/skill-factory && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "skill-factory" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-factory into .gemini/skills/skill-factory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-factory", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install nyldn/claude-octopus skill-factoryInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add nyldn/claude-octopus --skill skill-factory -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/nyldn/claude-octopus.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/skill-factory .github/skills/skill-factory && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "skill-factory" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-factory into .github/skills/skill-factory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-factory", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add nyldn/claude-octopus --skill skill-factory -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install nyldn/claude-octopus skill-factory --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nyldn/claude-octopus.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/skill-factory .opencode/skills/skill-factory && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "skill-factory" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-factory into .opencode/skills/skill-factory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-factory", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
skill-factoryRun a full build-and-ship pipeline from a spec — use for hands-off project generation
Skill Factory is an agent skill from nyldn/claude-octopus. Run a full build-and-ship pipeline from a spec — use for hands-off project generation
Its SKILL.md is about 2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).
It sits in Agent Workflows. The repository describes itself as: Run multiple AI models against the same research, design, or coding task. Surface disagreements before you ship. The licence is MIT.
9 steps, taken from the step headings in SKILL.md.
Read from SKILL.md and the folder at commit b34780d. It shows what the files ask for, not the result of running them.
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.
Shell commands in SKILL.md call:
claudecodexFrom the folder's file list and the shell code blocks in SKILL.md.
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Skill Factory loads about 2k tokens when it runs. Until then it costs about 25 tokens; SKILL.md has 699 words of instructions outside code blocks.
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.
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.
The full file from nyldn/claude-octopus at commit b34780d, republished under its MIT licence (© nyldn). 699 words, ~2,018 tokens.
.claude/skills/skill-factory/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.Host: Codex CLI — This skill was designed for Claude Code and adapted for Codex. Cross-reference commands use installed skill names in Codex rather than
/octo:*slash commands. Use the active Codex shell and subagent tools. Do not claim a provider, model, or host subagent is available until the current session exposes it. For host tool equivalents, seeskills/blocks/codex-host-adapter.md.
DO NOT call Skill() again. Execute directly.
Ask via AskUserQuestion BEFORE any other action:
If spec path provided inline with the command, use it but still ask remaining questions. If user says "skip", use defaults and proceed. DO NOT proceed to Step 2 until answered.
Check providers:
command -v codex &> /dev/null && codex_status="Available" || codex_status="Not installed"
command -v agy &> /dev/null && agy_status="Available" || agy_status="Not installed"Display banner:
🐙 CLAUDE OCTOPUS ACTIVATED - Dark Factory Mode
Pipeline: Parse → Scenarios → Embrace → Holdout → Score → Report
Providers:
Codex CLI - <status> — Scenario generation + holdout evaluation
Antigravity CLI - <status> — Additional external-model challenge
Claude - Orchestration + satisfaction scoring
Spec: <path>
Estimated: 0.50-2.00 USD / 15-45 minValidation: All external providers unavailable → continue with Claude-only (warn user about reduced diversity). At least one available → proceed normally.
if [[ ! -f "<spec_path>" ]]; then
echo "ERROR: Spec file not found at <spec_path>"
exit 1
fi
# Check minimum content
word_count=$(wc -w < "<spec_path>")
if [[ $word_count -lt 20 ]]; then
echo "WARNING: Spec is very thin ($word_count words). Results may be limited."
fiIf spec file missing → STOP, ask user for correct path. If spec is thin (< 50 words) → WARN but proceed. DO NOT proceed past this gate if file does not exist.
"${HOME}/.claude-octopus/plugin/scripts/state-manager.sh" init_state 2>/dev/null || true
"${HOME}/.claude-octopus/plugin/scripts/state-manager.sh" set_current_workflow "factory" "factory" 2>/dev/null || trueFailure → continue without state, warn user.
Before committing to the expensive embrace phase (~0.50-2.00 USD), verify that generated scenarios actually cover the spec's edge cases. A quick cross-provider challenge here can prevent wasting an entire factory run on incomplete scenario coverage.
After orchestrate.sh parses the spec (Phase 1-2) and before embrace execution (Phase 4), dispatch a scenario coverage review:
If a second provider is available, dispatch the challenge through Octopus routing:
# Read the spec to extract behaviors and constraints
SPEC_CONTENT=$(<"<spec_path>")
review_provider=""
command -v codex >/dev/null 2>&1 && review_provider="codex"
[[ -z "$review_provider" ]] && command -v agy >/dev/null 2>&1 && review_provider="agy"
if [[ -n "$review_provider" ]]; then
"${HOME}/.claude-octopus/plugin/scripts/orchestrate.sh" spawn "$review_provider" \
"You are a QA adversary. Given this specification and generated scenarios, identify coverage gaps.
SPECIFICATION:
${SPEC_CONTENT}
Answer:
1. Which spec BEHAVIORS have no scenario testing them?
2. Which EDGE CASES from the spec constraints are untested?
3. Which FAILURE MODES are not covered (network failures, invalid input, concurrent access)?
4. Rate overall coverage: SUFFICIENT / GAPS-FOUND / CRITICAL-GAPS
Be specific — cite the behavior or constraint ID that lacks coverage." 2>/dev/null || true
fiAfter receiving the challenge response:
/octo:spec before proceedingThis is a lightweight gate — it adds ~30 seconds but can save a 2.00 USD factory run on a spec with poor scenario coverage.
Skip with --fast or when user explicitly requests speed over thoroughness.
${HOME}/.claude-octopus/plugin/scripts/orchestrate.sh factory --spec "<spec_path>"With optional flags based on Step 1 answers:
--holdout-ratio <value> if custom ratio requested--max-retries <value> if custom retry count--ci if user approved non-interactive mode<HARD-GATE>
PROHIBITED from:
- Running embrace directly (MUST use factory command which wraps it)
- Simulating or faking holdout testing
- Substituting direct Claude analysis for multi-provider scoring
- Skipping the factory pipeline
- Creating working/progress files in plugin directory
</HARD-GATE>
REPORT_FILE=$(find .octo/factory -name "factory-report.md" -mmin -60 2>/dev/null | sort -r | head -1)
if [[ -z "$REPORT_FILE" ]]; then
echo "ERROR: Factory report not found"
exit 1
fi
cat "$REPORT_FILE"If validation fails: report error, show logs from ~/.claude-octopus/logs/, DO NOT proceed, DO NOT substitute.
SCORES_FILE=$(find .octo/factory -name "satisfaction-scores.json" -mmin -60 2>/dev/null | sort -r | head -1)
if [[ -n "$SCORES_FILE" ]]; then
cat "$SCORES_FILE"
fiPresent to user:
"${HOME}/.claude-octopus/plugin/scripts/state-manager.sh" record_decision "factory" "Factory run completed: <verdict> (<score>/<target>)" 2>/dev/null || truePresent next-step suggestions based on verdict:
holdout-results.md for specific failures. Consider:/octo:spec--max-retries 2Include attribution footer:
Dark Factory Mode powered by Claude Octopus v8.25.0
Pipeline: Spec → Scenarios → Embrace → Holdout → Score → Report
Providers: Codex | Antigravity | Claude© nyldn, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
SKILL.md and 1 other file in skills/skill-factory of nyldn/claude-octopus.
Open the folder on GitHubat commit b34780d
We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in nyldn/claude-octopus, which our catalogue first saw on October 7, 2026.
Skill Factory 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Skill Factory this skillnyldn/claude-octopus | 4.2k | 1 repos | ~2k | Automated safety check: Pass | MIT | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 10 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Using Superpowersfarm-fe/farm | 5.6k | 35 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Executing Plans Inlineobra/superpowers | 297k | 2 repos | ~5.1k | Automated safety check: Pass | MIT | |
| Skill CreatorAzure/azqr | 796 | 89 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 |
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
anthropics/claude-plugins-official
Explains how to write Claude Code plugin hooks, both prompt-based checks and bash commands, for events such as PreToolUse, Stop and SessionStart.
farm-fe/farm
A skill your agent uses when starting any conversation - establishes how to find and use skills, requiring Skill tool invocation before ANY response including clarifying questions
obra/superpowers
Has the agent carry out an implementation plan itself, task by task in the current session, keeping a ledger, proving each step with a test and ending with one whole-branch review.
Azure/azqr
Create new skills, modify and improve existing skills, and measure skill performance.
anthropics/claude-plugins-official
Explains how to write agents for Claude Code plugins: the markdown file with YAML frontmatter, trigger descriptions, model and color settings, and system prompt design.
nyldn/claude-octopus
Quick execution for ad-hoc tasks without full workflow overhead — use for small, self-contained requests
nyldn/claude-octopus
Thorough research across multiple sources — use for complex topics needing broad synthesis
nyldn/claude-octopus
OWASP compliance, vulnerability scanning, and adversarial red team testing — use for security reviews
nyldn/claude-octopus
Audit codebases for quality, consistency, and broken patterns — use for pre-release or tech debt review
nyldn/claude-octopus
Extract patterns and anatomy from URLs — use to reverse-engineer content strategies from live pages
nyldn/claude-octopus
Auto-detect work context (Dev vs Knowledge) — use to tailor workflows based on current task type
Categories
Run a full build-and-ship pipeline from a spec — use for hands-off project generation. Skill Factory is an agent skill from nyldn/claude-octopus.
Skill Factory fits situations like: hands-off project generation.
Run `npx skills add nyldn/claude-octopus --skill skill-factory -a claude-code`. Or copy the skill folder (skills/skill-factory in nyldn/claude-octopus) into .claude/skills/skill-factory in your project. Claude Code loads it when a task matches its description.
Run `npx skills add nyldn/claude-octopus --skill skill-factory -a codex`. Or copy the skill folder (skills/skill-factory in nyldn/claude-octopus) into .agents/skills/skill-factory in your project. Codex loads it when a task matches its description.
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add nyldn/claude-octopus --skill skill-factory -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/skill-factory, .gemini/skills/skill-factory, .github/skills/skill-factory and .opencode/skills/skill-factory in your project.
Going by SKILL.md and its folder, Skill Factory needs the command-line tools its instructions call (claude and codex).
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.
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.
Skill Factory is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
About 2k tokens (SKILL.md is roughly 8.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
Skills that share tags, products or a category with Skill Factory: MCP Server Builder (anthropics/skills, 180k stars), Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Using Superpowers (farm-fe/farm, 5.6k stars) and Executing Plans Inline (obra/superpowers, 297k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
nyldn (a GitHub user) maintains it in nyldn/claude-octopus, which has 4,198 GitHub stars. The repository holds 62 skills in this directory. The repository was last updated on October 9, 2026.
Source: nyldn/claude-octopus on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.