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Agent skill

Create New Tool

by opensage-agent in opensage-agent/opensage-adk

Scaffold a new bashtools Skill under bashtools/newtools/. An agent skill from opensage-agent/opensage-adk.

Apache-2.0Auto-check passed

Install Create New Tool

skills CLI
$ npx skills add opensage-agent/opensage-adk --skill create-new-tool -a claude-code

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

GitHub CLI
$ gh skill install opensage-agent/opensage-adk create-new-tool --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/opensage-agent/opensage-adk.git skills-src && mkdir -p .claude/skills && cp -r skills-src/src/opensage/bash_tools/new_tool_creator .claude/skills/create-new-tool && 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
create-new-tool
GitHub stars
127
Token cost
~302 tokens
SKILL.md length
74 words
Files
3 (incl. scripts)
Skills in repo
21
Repo updated
First seen
Licence
Apache-2.0

At a glance

Scaffold a new bashtools Skill under bashtools/newtools/. An agent skill from opensage-agent/opensage-adk.

  • SKILL.md covers Usage, Parameters, Return Value and Requires Sandbox, plus 1 more section
  • Runs Python and Shell scripts from its folder

What it does

Create New Tool is an agent skill from opensage-agent/opensage-adk. Scaffold a new bashtools Skill under bashtools/newtools/.

Its SKILL.md is about 300 tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including scripts (for example `init_skill.py` and `scripts/create_new_tool.sh`).

It works with Bash. The licence is Apache-2.0.

Example prompts

  • “/create-new-tool”

Requirements

  • Python 3
  • A Bash shell

What it can do on your machine

Read from SKILL.md and the folder at commit 54d6470. 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

    Ships 1 file in scripts/ (Python and Shell), which the agent can run.

    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

Create New Tool loads about 302 tokens when it runs. Until then it costs about 19 tokens; SKILL.md has 74 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~19
When it runs · the whole SKILL.md, loaded when a task matches
~302

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); the scripts in this folder are not scanned.

SKILL.md

The full file from opensage-agent/opensage-adk at commit 54d6470, republished under its Apache-2.0 licence (© opensage-agent). 74 words, ~302 tokens.

Download SKILL.mdSave it as .claude/skills/create-new-tool/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
create-new-tool
description
Scaffold a new bash_tools Skill under bash_tools/new_tools/.
should_run_in_sandbox
main
returns_json
true

Create New Tool

Scaffold a new bash_tools Skill.

Usage

bash
/bash_tools/new_tool_creator/scripts/create_new_tool.sh my-tool-name --should_run_in_sandbox main --returns_json true

Parameters

tool_name (required, positional position 0)

Type: str

Tool name (hyphen-case, e.g. my-tool-name).

--should_run_in_sandbox (required, named parameter)

Type: str

Execution sandbox (e.g. main, fuzz, neo4j, joern).

--returns_json (required, named parameter)

Type: str

true or false.

--category (optional, named parameter)

Type: str

Subdirectory under bash_tools/new_tools/ (default: general).

--requires_sandboxes (optional, named parameter)

Type: str

Dependency sandboxes (comma-separated) or none.

Return Value

json
{
  "success": true,
  "tool_name": "my-tool-name",
  "category": "general",
  "path": "/path/to/bash_tools/new_tools/general/my-tool-name",
  "message": "Tool created successfully"
}

Requires Sandbox

none

Timeout

30 seconds

© opensage-agent, 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

SKILL.md and 2 other files (scripts) in src/opensage/bash_tools/new_tool_creator of opensage-agent/opensage-adk.

  • SKILL.md
  • init_skill.py
  • scripts/create_new_tool.sh

Open the folder on GitHubat commit 54d6470

Compare with similar skills

Create New Tool 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.

Create New Tool compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Create New Tool this skillopensage-agent/opensage-adk127—~302Automated safety check: PassApache-2.0
Hook Development for Claude Code Pluginsanthropics/claude-plugins-official38k11 repos~4.1kAutomated safety check: NotesApache-2.0
Plugin Settings Patternanthropics/claude-plugins-official38k7 repos~3kAutomated safety check: PassApache-2.0
Mole Bug Patternstw93/Mole70k—~2kAutomated safety check: PassGPL-3.0
Neat-Freak Knowledge CloseoutKKKKhazix/khazix-skills21k—~1.9kAutomated safety check: PassMIT
E2Ecallstack/react-native-pager-view3.4k1 repos~2.1kAutomated safety check: PassMIT

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Works with

Questions about Create New Tool

What does Create New Tool do?

Scaffold a new bashtools Skill under bashtools/newtools/. An agent skill from opensage-agent/opensage-adk. Create New Tool is an agent skill from opensage-agent/opensage-adk. Scaffold a new bashtools Skill under bashtools/newtools/.

How do I install Create New Tool in Claude Code?

Run `npx skills add opensage-agent/opensage-adk --skill create-new-tool -a claude-code`. Or copy the skill folder (src/opensage/bash_tools/new_tool_creator in opensage-agent/opensage-adk) into .claude/skills/create-new-tool in your project. Claude Code loads it when a task matches its description.

How do I install Create New Tool in Codex?

Run `npx skills add opensage-agent/opensage-adk --skill create-new-tool -a codex`. Or copy the skill folder (src/opensage/bash_tools/new_tool_creator in opensage-agent/opensage-adk) into .agents/skills/create-new-tool in your project. Codex loads it when a task matches its description.

Can I use Create New Tool 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 opensage-agent/opensage-adk --skill create-new-tool -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/create-new-tool, .gemini/skills/create-new-tool, .github/skills/create-new-tool and .opencode/skills/create-new-tool in your project.

What does Create New Tool need to run?

Going by SKILL.md and its folder, Create New Tool needs Python and a shell for the scripts in its folder. Our summary lists: Python 3; A Bash shell.

Does Create New Tool 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 Create New Tool 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Create New Tool use?

Create New Tool 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 Create New Tool use?

About 302 tokens (SKILL.md is roughly 1.2k 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 Create New Tool?

Skills that share tags, products or a category with Create New Tool: Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Plugin Settings Pattern (anthropics/claude-plugins-official, 38k stars), Mole Bug Patterns (tw93/Mole, 70k stars) and Neat-Freak Knowledge Closeout (KKKKhazix/khazix-skills, 21k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Create New Tool?

opensage-agent (a GitHub organization) maintains it in opensage-agent/opensage-adk, which has 127 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on August 4, 2026.

Source: opensage-agent/opensage-adk on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.