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.
Pre/post dev toolbox — named bundles of skills/agents loaded before development work and councils of experts invoked after.
MITAuto-check passed
Install Toolbox
$ npx skills add stevesolun/ctx --skill toolbox -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install stevesolun/ctx toolbox --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/stevesolun/ctx.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/toolbox .claude/skills/toolbox && 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 "toolbox" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/toolbox into .claude/skills/toolbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "toolbox", 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/stevesolun/ctx/tree/main/skills/toolboxType 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 stevesolun/ctx --skill toolbox -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install stevesolun/ctx toolbox --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/stevesolun/ctx.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/toolbox .agents/skills/toolbox && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "toolbox" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/toolbox into .agents/skills/toolbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "toolbox", 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 stevesolun/ctx --skill toolbox -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install stevesolun/ctx toolbox --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/stevesolun/ctx.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/toolbox .cursor/skills/toolbox && 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 "toolbox" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/toolbox into .cursor/skills/toolbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "toolbox", 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/stevesolun/ctx.git --path skills/toolbox--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 stevesolun/ctx --skill toolbox -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install stevesolun/ctx toolbox --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/stevesolun/ctx.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/toolbox .gemini/skills/toolbox && 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 "toolbox" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/toolbox into .gemini/skills/toolbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "toolbox", 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 stevesolun/ctx toolboxInstalls 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 stevesolun/ctx --skill toolbox -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/stevesolun/ctx.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/toolbox .github/skills/toolbox && 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 "toolbox" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/toolbox into .github/skills/toolbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "toolbox", 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 stevesolun/ctx --skill toolbox -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install stevesolun/ctx toolbox --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/stevesolun/ctx.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/toolbox .opencode/skills/toolbox && 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 "toolbox" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/toolbox into .opencode/skills/toolbox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "toolbox", 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
toolbox- GitHub stars
- 588
- Token cost
- ~791 tokens
- SKILL.md length
- 241 words
- Files
- 1
- Skills in repo
- 26
- Repo updated
- First seen
- Licence
- MIT
At a glance
Pre/post dev toolbox — named bundles of skills/agents loaded before development work and councils of experts invoked after.
- SKILL.md covers Quick reference, Starter templates, Data model and Invoke when, plus 1 more section
- Calls python
What it does
Toolbox is an agent skill from stevesolun/ctx. Pre/post dev toolbox — named bundles of skills/agents loaded before development work and councils of experts invoked after. Run /toolbox or the toolbox.py CLI to list, activate, initialize, export, import, and validate toolboxes. Invoke at the start or end of a dev session, when setting up a new repo, or when sharing toolboxes with a team.
Its SKILL.md is about 790 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: CTX Fit finds the cheapest AI coding setup that reliably works on your repository, then applies the winner as a reviewable change. The licence is MIT.
Example prompts
- “/toolbox”
Requirements
- Python 3
What it can do on your machine
Read from SKILL.md and the folder at commit 11b582a. 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:
python
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
Toolbox loads about 791 tokens when it runs. Until then it costs about 87 tokens; SKILL.md has 241 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 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 stevesolun/ctx at commit 11b582a, republished under its MIT licence (© stevesolun). 241 words, ~791 tokens.
Download SKILL.mdSave it as
.claude/skills/toolbox/SKILL.md (or your agent's skills folder).- name
- toolbox
- description
- Pre/post dev toolbox — named bundles of skills/agents loaded before development work and councils of experts invoked after. Run /toolbox or the toolbox.py CLI to list, activate, initialize, export, import, and validate toolboxes. Invoke at the start or end of a dev session, when setting up a new repo, or when sharing toolboxes with a team.
- type
- feature
- priority
- 50
- always_load
- false
toolbox
Named bundles of skills/agents that run before (pre) or after (post)
a development task. Learn patterns from past work and propose new bundles.
Invoke slash, pre-commit, session-end, or file-save.
Quick reference
| Task | Command |
|---|---|
| Seed 5 starter toolboxes | python src/toolbox.py init |
| List available toolboxes | python src/toolbox.py list |
| Inspect one | python src/toolbox.py show ship-it |
| Activate (global) | python src/toolbox.py activate ship-it |
| Export for sharing | python src/toolbox.py export ship-it |
| Import a shared toolbox | python src/toolbox.py import file.yaml |
| Validate config | python src/toolbox.py validate |
Starter templates
| Name | When to use |
|---|---|
| ship-it | End-of-feature: 7-expert council on the change set |
| security-sweep | Security audit with guardrail blocking HIGH findings |
| refactor-safety | Refactors with graph-informed blast radius |
| docs-review | When touching Markdown or API docs |
| fresh-repo-init | Blank repo: run intent interview and scaffold |
Data model
Global: ~/.claude/toolboxes.json.
Per-repo (overrides global): <repo_root>/.toolbox.yaml.
Each toolbox declares:
pre— skills/agents to load before work startspost— agents that form the council after work endsscope.analysis—diff|full|graph-blast|dynamictrigger—slash,pre_commit,session_end, orfile_saveglobbudget.max_tokens/budget.max_seconds— hard stop on runaway costdedup.policy—fresh(always re-run) orcached(reuse within window)guardrail— if true, block commit on HIGH findings
Invoke when
- User says "I'm done with this feature" or commits a feature branch.
- User opens a fresh repo (triggers
fresh-repo-initsuggestion). - User touches security-sensitive paths (triggers
security-sweepfile_save). - User asks "what toolboxes do I have?" or "run the council".
Reasoning
See docs/toolbox/index.md, docs/toolbox/starters.md, and
docs/toolbox/verdicts.md for the current toolbox contract, starter bundles,
and guardrail behavior.
© stevesolun, MIT. 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 skills/toolbox of stevesolun/ctx.
Open the folder on GitHubat commit 11b582a
Compare with similar skills
Toolbox 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 |
|---|---|---|---|---|---|---|
| Toolbox this skillstevesolun/ctx | 588 | — | ~791 | Automated safety check: Pass | MIT | |
| MCP Server Builderanthropics/skills | 180k | 64 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 | 14 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 |
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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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More from stevesolun/ctx
All 26 skills in this repoDiagnosing Bugs
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Diagnose hard bugs and performance regressions with reproducible evidence, focused hypotheses, and proportional instrumentation.
Repo Stats Autoupdate
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Keeps README badge + inline counts in sync with the real number of skills, agents, graph nodes/edges, communities, converted pipelines, and test inventory.
Code Review
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Review a Git diff against repository standards and its originating requirements.
No Mistakes
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Validate committed feature-branch changes through the no-mistakes pipeline: intent, rebase, review, test, docs, lint, push, PR, and CI.
Skill Router
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Repo-aware recommendation manager for ctx. An agent skill from stevesolun/ctx.
Codebase Design
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Design or improve module interfaces using deep-module heuristics.
Related
Works with
Questions about Toolbox
What does Toolbox do?
Pre/post dev toolbox — named bundles of skills/agents loaded before development work and councils of experts invoked after. Toolbox is an agent skill from stevesolun/ctx. Pre/post dev toolbox — named bundles of skills/agents loaded before development work and councils of experts invoked after.
How do I install Toolbox in Claude Code?
Run `npx skills add stevesolun/ctx --skill toolbox -a claude-code`. Or copy the skill folder (skills/toolbox in stevesolun/ctx) into .claude/skills/toolbox in your project. Claude Code loads it when a task matches its description.
How do I install Toolbox in Codex?
Run `npx skills add stevesolun/ctx --skill toolbox -a codex`. Or copy the skill folder (skills/toolbox in stevesolun/ctx) into .agents/skills/toolbox in your project. Codex loads it when a task matches its description.
Can I use Toolbox 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 stevesolun/ctx --skill toolbox -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/toolbox, .gemini/skills/toolbox, .github/skills/toolbox and .opencode/skills/toolbox in your project.
What does Toolbox need to run?
Going by SKILL.md and its folder, Toolbox needs the command-line tools its instructions call (python). Our summary lists: Python 3.
Does Toolbox 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 Toolbox 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 Toolbox use?
Toolbox is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Toolbox use?
About 791 tokens (SKILL.md is roughly 3.2k 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 Toolbox?
Skills that share tags, products or a category with Toolbox: 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 Toolbox?
stevesolun (a GitHub user) maintains it in stevesolun/ctx, which has 588 GitHub stars. The repository holds 26 skills in this directory. The repository was last updated on October 4, 2026.
Source: stevesolun/ctx on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.