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.
Python-based testbench generation using Cocotb. An agent skill from codejunkie99/Gateflow-Plugin.
Custom licenceAuto-check: notes
Install Gf Cocotb
$ npx skills add codejunkie99/Gateflow-Plugin --skill gf-cocotb -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install codejunkie99/Gateflow-Plugin gf-cocotb --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/codejunkie99/Gateflow-Plugin.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/gateflow/skills/gf-cocotb .claude/skills/gf-cocotb && 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 "gf-cocotb" agent skill from https://github.com/codejunkie99/Gateflow-Plugin/tree/main/plugins/gateflow/skills/gf-cocotb into .claude/skills/gf-cocotb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gf-cocotb", 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/codejunkie99/Gateflow-Plugin/tree/main/plugins/gateflow/skills/gf-cocotbType 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 codejunkie99/Gateflow-Plugin --skill gf-cocotb -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install codejunkie99/Gateflow-Plugin gf-cocotb --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/codejunkie99/Gateflow-Plugin.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/gateflow/skills/gf-cocotb .agents/skills/gf-cocotb && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "gf-cocotb" agent skill from https://github.com/codejunkie99/Gateflow-Plugin/tree/main/plugins/gateflow/skills/gf-cocotb into .agents/skills/gf-cocotb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gf-cocotb", 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 codejunkie99/Gateflow-Plugin --skill gf-cocotb -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install codejunkie99/Gateflow-Plugin gf-cocotb --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/codejunkie99/Gateflow-Plugin.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/gateflow/skills/gf-cocotb .cursor/skills/gf-cocotb && 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 "gf-cocotb" agent skill from https://github.com/codejunkie99/Gateflow-Plugin/tree/main/plugins/gateflow/skills/gf-cocotb into .cursor/skills/gf-cocotb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gf-cocotb", 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/codejunkie99/Gateflow-Plugin.git --path plugins/gateflow/skills/gf-cocotb--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 codejunkie99/Gateflow-Plugin --skill gf-cocotb -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install codejunkie99/Gateflow-Plugin gf-cocotb --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/codejunkie99/Gateflow-Plugin.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/gateflow/skills/gf-cocotb .gemini/skills/gf-cocotb && 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 "gf-cocotb" agent skill from https://github.com/codejunkie99/Gateflow-Plugin/tree/main/plugins/gateflow/skills/gf-cocotb into .gemini/skills/gf-cocotb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gf-cocotb", 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 codejunkie99/Gateflow-Plugin gf-cocotbInstalls 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 codejunkie99/Gateflow-Plugin --skill gf-cocotb -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/codejunkie99/Gateflow-Plugin.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/gateflow/skills/gf-cocotb .github/skills/gf-cocotb && 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 "gf-cocotb" agent skill from https://github.com/codejunkie99/Gateflow-Plugin/tree/main/plugins/gateflow/skills/gf-cocotb into .github/skills/gf-cocotb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gf-cocotb", 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 codejunkie99/Gateflow-Plugin --skill gf-cocotb -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install codejunkie99/Gateflow-Plugin gf-cocotb --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/codejunkie99/Gateflow-Plugin.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/gateflow/skills/gf-cocotb .opencode/skills/gf-cocotb && 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 "gf-cocotb" agent skill from https://github.com/codejunkie99/Gateflow-Plugin/tree/main/plugins/gateflow/skills/gf-cocotb into .opencode/skills/gf-cocotb/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "gf-cocotb", 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.
Facts
- Skill name
gf-cocotb- GitHub stars
- 117
- Token cost
- ~1.4k tokens
- SKILL.md length
- 145 words
- Files
- 1
- Skills in repo
- 26
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Python-based testbench generation using Cocotb. An agent skill from codejunkie99/Gateflow-Plugin.
- SKILL.md covers Tool Detection, Test Template, When to Use and Makefile Template, plus 5 more sections
- Calls pip and python3
What it does
Gf Cocotb is an agent skill from codejunkie99/Gateflow-Plugin. Python-based testbench generation using Cocotb. Alternative to SystemVerilog testbenches for Python-native hardware engineers. Example: "create a cocotb test for the FIFO", "write Python testbench"
Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Python. The repository describes itself as: AI-powered SystemVerilog development assistant — design, verify, debug, and deliver working RTL with natural language.
Example prompts
- “create a cocotb test for the FIFO”
- “write Python testbench”
- “/gf-cocotb”
Requirements
- Python 3
- Pre-approved tools (allowed-tools): Bash, Read, Write, Glob, Grep, Task, AskUserQuestion
What it can do on your machine
Read from SKILL.md and the folder at commit bf7e94c. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
BashReadWriteGlobGrepTaskAskUserQuestion
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
pippython3
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use pip, which can reach the network depending on how they are called.
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
Gf Cocotb loads about 1.4k tokens when it runs. Until then it costs about 52 tokens; SKILL.md has 145 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.
Safety
Auto-check: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
allowed-tools: Bash, Read, Write, Glob, Grep, Task, AskUserQuestion
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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 145 words (~1,370 tokens).
“Generate Cocotb testbenches as an alternative to SystemVerilog TBs.”
- name
- gf-cocotb
- allowed-tools
- Bash, Read, Write, Glob, Grep, Task, AskUserQuestion
- user-invocable
- true
Files
Just SKILL.md in plugins/gateflow/skills/gf-cocotb of codejunkie99/Gateflow-Plugin.
Open the folder on GitHubat commit bf7e94c
Compare with similar skills
Gf Cocotb 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 |
|---|---|---|---|---|---|---|
| Gf Cocotb this skillcodejunkie99/Gateflow-Plugin | 117 | — | ~1.4k | Automated safety check: Notes | Custom licence | |
| MCP Server Builderanthropics/skills | 180k | 62 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| PDF Processinganthropics/skills | 180k | 48 repos | ~2k | Automated safety check: Pass | Proprietary | |
| NotebookLM Research AssistantPleasePrompto/notebooklm-skill | 7.8k | 13 repos | ~2.4k | Automated safety check: Notes | MIT | |
| Manim Video Productionbrowser-use/video-use | 28k | 6 repos | ~3k | Automated safety check: Pass | MIT | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT |
Similar skills
- Official
- Official
PDF Processing
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NotebookLM Research Assistant
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Lets Claude Code ask questions of your Google NotebookLM notebooks through browser automation and return answers grounded in your uploaded sources.
Manim Video Production
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Produces math and technical explainer videos with Manim Community Edition: concept animations, equation derivations, algorithm walkthroughs and data stories.
Code Review Checklist
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Reviews code against a five-part checklist covering security, correctness, performance, maintainability and testing, and reports findings in a fixed format.
PPT Master
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Generates editable PowerPoint decks, rebuilds slides from images, fills .pptx templates and polishes existing presentations through routed workflows.
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Related
Works with
Questions about Gf Cocotb
What does Gf Cocotb do?
Python-based testbench generation using Cocotb. An agent skill from codejunkie99/Gateflow-Plugin. Gf Cocotb is an agent skill from codejunkie99/Gateflow-Plugin. Python-based testbench generation using Cocotb.
How do I install Gf Cocotb in Claude Code?
Run `npx skills add codejunkie99/Gateflow-Plugin --skill gf-cocotb -a claude-code`. Or copy the skill folder (plugins/gateflow/skills/gf-cocotb in codejunkie99/Gateflow-Plugin) into .claude/skills/gf-cocotb in your project. Claude Code loads it when a task matches its description.
How do I install Gf Cocotb in Codex?
Run `npx skills add codejunkie99/Gateflow-Plugin --skill gf-cocotb -a codex`. Or copy the skill folder (plugins/gateflow/skills/gf-cocotb in codejunkie99/Gateflow-Plugin) into .agents/skills/gf-cocotb in your project. Codex loads it when a task matches its description.
Can I use Gf Cocotb 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 codejunkie99/Gateflow-Plugin --skill gf-cocotb -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/gf-cocotb, .gemini/skills/gf-cocotb, .github/skills/gf-cocotb and .opencode/skills/gf-cocotb in your project.
What does Gf Cocotb need to run?
Going by SKILL.md and its folder, Gf Cocotb needs the command-line tools its instructions call (pip and python3). Our summary lists: Python 3. Its frontmatter pre-approves these tools: Bash, Read, Write, Glob, Grep, Task, AskUserQuestion.
Does Gf Cocotb access the network?
SKILL.md contains no URLs. Its commands use pip, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Gf Cocotb safe to install?
Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.
What licence does Gf Cocotb use?
Gf Cocotb has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Gf Cocotb use?
About 1.4k tokens (SKILL.md is roughly 5.5k 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 Gf Cocotb?
Skills that share tags, products or a category with Gf Cocotb: MCP Server Builder (anthropics/skills, 180k stars), PDF Processing (anthropics/skills, 180k stars), NotebookLM Research Assistant (PleasePrompto/notebooklm-skill, 7.8k stars) and Manim Video Production (browser-use/video-use, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Gf Cocotb?
codejunkie99 (a GitHub user) maintains it in codejunkie99/Gateflow-Plugin, which has 117 GitHub stars. The repository holds 26 skills in this directory. The repository was last updated on September 16, 2026.
Source: codejunkie99/Gateflow-Plugin on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.