ToolJet Marketplace Plugin Builder
ToolJet/ToolJet
Turns an API description, such as an OpenAPI file or a Postman collection, into a connector plugin for ToolJet's marketplace and checks it with the repo's validator.
Update Counterfact CLI option behavior, config resolution, telemetry-safe startup handling, and bootstrap/runtime entrypoint flow.
Install Counterfact CLI Runtime
$ npx skills add counterfact/api-simulator --skill counterfact-cli-runtime -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install counterfact/api-simulator counterfact-cli-runtime --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/counterfact/api-simulator.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.github/skills/counterfact-cli-runtime .claude/skills/counterfact-cli-runtime && 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 "counterfact-cli-runtime" agent skill from https://github.com/counterfact/api-simulator/tree/main/.github/skills/counterfact-cli-runtime into .claude/skills/counterfact-cli-runtime/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "counterfact-cli-runtime", 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/counterfact/api-simulator/tree/main/.github/skills/counterfact-cli-runtimeType 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 counterfact/api-simulator --skill counterfact-cli-runtime -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install counterfact/api-simulator counterfact-cli-runtime --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/counterfact/api-simulator.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.github/skills/counterfact-cli-runtime .agents/skills/counterfact-cli-runtime && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "counterfact-cli-runtime" agent skill from https://github.com/counterfact/api-simulator/tree/main/.github/skills/counterfact-cli-runtime into .agents/skills/counterfact-cli-runtime/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "counterfact-cli-runtime", 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 counterfact/api-simulator --skill counterfact-cli-runtime -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install counterfact/api-simulator counterfact-cli-runtime --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/counterfact/api-simulator.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.github/skills/counterfact-cli-runtime .cursor/skills/counterfact-cli-runtime && 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 "counterfact-cli-runtime" agent skill from https://github.com/counterfact/api-simulator/tree/main/.github/skills/counterfact-cli-runtime into .cursor/skills/counterfact-cli-runtime/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "counterfact-cli-runtime", 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/counterfact/api-simulator.git --path .github/skills/counterfact-cli-runtime--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 counterfact/api-simulator --skill counterfact-cli-runtime -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install counterfact/api-simulator counterfact-cli-runtime --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/counterfact/api-simulator.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.github/skills/counterfact-cli-runtime .gemini/skills/counterfact-cli-runtime && 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 "counterfact-cli-runtime" agent skill from https://github.com/counterfact/api-simulator/tree/main/.github/skills/counterfact-cli-runtime into .gemini/skills/counterfact-cli-runtime/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "counterfact-cli-runtime", 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 counterfact/api-simulator counterfact-cli-runtimeInstalls 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 counterfact/api-simulator --skill counterfact-cli-runtime -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/counterfact/api-simulator.git skills-src && mkdir -p .github/skills && cp -r skills-src/.github/skills/counterfact-cli-runtime .github/skills/counterfact-cli-runtime && 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 "counterfact-cli-runtime" agent skill from https://github.com/counterfact/api-simulator/tree/main/.github/skills/counterfact-cli-runtime into .github/skills/counterfact-cli-runtime/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "counterfact-cli-runtime", 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 counterfact/api-simulator --skill counterfact-cli-runtime -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install counterfact/api-simulator counterfact-cli-runtime --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/counterfact/api-simulator.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.github/skills/counterfact-cli-runtime .opencode/skills/counterfact-cli-runtime && 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 "counterfact-cli-runtime" agent skill from https://github.com/counterfact/api-simulator/tree/main/.github/skills/counterfact-cli-runtime into .opencode/skills/counterfact-cli-runtime/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "counterfact-cli-runtime", 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
counterfact-cli-runtime- GitHub stars
- 170
- Token cost
- ~584 tokens
- SKILL.md length
- 195 words
- Files
- 1
- Skills in repo
- 12
- Repo updated
- First seen
- Licence
- MIT
At a glance
Update Counterfact CLI option behavior, config resolution, telemetry-safe startup handling, and bootstrap/runtime entrypoint flow.
- Tasks that involve OpenAPI specifications
- SKILL.md covers When to use this skill, Files to inspect first, Existing conventions to follow and Common mistakes to avoid, plus 1 more section
- Calls yarn
What it does
Counterfact CLI Runtime is an agent skill from counterfact/api-simulator. Update Counterfact CLI option behavior, config resolution, telemetry-safe startup handling, and bootstrap/runtime entrypoint flow.
Its SKILL.md is about 580 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 Backend & APIs, covering OpenAPI specifications. It works with OpenAPI. The repository describes itself as: Turn an OpenAPI spec into a local API in one command. Build and test your frontend with custom responses, shared state, and simulated failures, without waiting for the backend. The licence is MIT.
When your agent uses it
- Tasks that involve OpenAPI specifications
Example prompts
- “/counterfact-cli-runtime”
What it can do on your machine
Read from SKILL.md and the folder at commit ad1a2a3. 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:
yarn
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use yarn, 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
Counterfact CLI Runtime loads about 584 tokens when it runs. Until then it costs about 39 tokens; SKILL.md has 195 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 counterfact/api-simulator at commit ad1a2a3, republished under its MIT licence (© counterfact). 195 words, ~584 tokens.
Download SKILL.mdSave it as
.claude/skills/counterfact-cli-runtime/SKILL.md (or your agent's skills folder).- name
- counterfact-cli-runtime
- description
- Update Counterfact CLI option behavior, config resolution, telemetry-safe startup handling, and bootstrap/runtime entrypoint flow.
- applyTo
- packages/counterfact/bin/counterfact.js, packages/counterfact/src/cli/**/*.ts, packages/counterfact/src/util/load-config-file.ts…
Counterfact CLI Runtime Skill
When to use this skill
Use this skill for CLI flags, option precedence, config file loading, startup diagnostics, Node/runtime bootstrap behavior, or telemetry option changes.
Files to inspect first
packages/counterfact/bin/counterfact.jspackages/counterfact/src/cli/run.tspackages/counterfact/src/cli/telemetry.tspackages/counterfact/src/util/load-config-file.tspackages/counterfact/test/cli/run.test.tspackages/counterfact/docs/reference.md(CLI reference)
Existing conventions to follow
- Keep
packages/counterfact/bin/counterfact.jsminimal: version gate + runtime capability probe + delegate torunCli. - Keep CLI precedence explicit: CLI flags override config file values (
program.getOptionValueSource). - Treat sensitive values carefully in logs/telemetry (hash file locations, avoid raw secrets/paths).
- Preserve existing defaults where no action flags are passed (serve/repl/watch/generate/buildCache behavior).
- Keep startup status truthful and compact: report only work that has actually completed, do not expose local input/output paths in normal status lines, and use ANSI colour only for an interactive stdout that has not opted out through
NO_COLOR.
Common mistakes to avoid
- Adding heavy logic to
packages/counterfact/bin/counterfact.jsinstead ofpackages/counterfact/src/cli/. - Breaking positional argument shifting with
--specstring mode. - Logging tokens/secrets or raw private locations.
- Changing defaults without updating tests and docs in lockstep.
How to validate the change
- Run:
yarn lint,yarn build,yarn test. - Run CLI-focused tests:
packages/counterfact/test/cli/run.test.ts,packages/counterfact/test/cli/telemetry.test.ts,packages/counterfact/test/cli/check-for-updates.test.ts. - For user-facing CLI behavior changes, update docs under
packages/counterfact/docs/and add a changeset.
© counterfact, 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 .github/skills/counterfact-cli-runtime of counterfact/api-simulator.
Open the folder on GitHubat commit ad1a2a3
Compare with similar skills
Counterfact CLI Runtime 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 |
|---|---|---|---|---|---|---|
| Counterfact CLI Runtime this skillcounterfact/api-simulator | 170 | — | ~584 | Automated safety check: Pass | MIT | |
| ToolJet Marketplace Plugin BuilderToolJet/ToolJet | 41k | — | ~2.1k | Automated safety check: Pass | AGPL-3.0 | |
| Step Partsearthtojake/text-to-cad | 18k | 1 repos | ~1.5k | Automated safety check: Pass | MIT | |
| API DesignerJeffallan/claude-skills | 12k | 2 repos | ~2k | Automated safety check: Pass | MIT | |
| OpenAPI to MCP Servermcp-use/mcp-use | 11k | — | ~5.2k | Automated safety check: Pass | Apache-2.0 | |
| Use Yaakmountain-loop/yaak | 19k | — | ~1.9k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Counterfact CLI Runtime
What does Counterfact CLI Runtime do?
Update Counterfact CLI option behavior, config resolution, telemetry-safe startup handling, and bootstrap/runtime entrypoint flow. Counterfact CLI Runtime is an agent skill from counterfact/api-simulator. Update Counterfact CLI option behavior, config resolution, telemetry-safe startup handling, and bootstrap/runtime entrypoint flow.
When should I use Counterfact CLI Runtime?
Counterfact CLI Runtime fits situations like: tasks that involve OpenAPI specifications.
How do I install Counterfact CLI Runtime in Claude Code?
Run `npx skills add counterfact/api-simulator --skill counterfact-cli-runtime -a claude-code`. Or copy the skill folder (.github/skills/counterfact-cli-runtime in counterfact/api-simulator) into .claude/skills/counterfact-cli-runtime in your project. Claude Code loads it when a task matches its description.
How do I install Counterfact CLI Runtime in Codex?
Run `npx skills add counterfact/api-simulator --skill counterfact-cli-runtime -a codex`. Or copy the skill folder (.github/skills/counterfact-cli-runtime in counterfact/api-simulator) into .agents/skills/counterfact-cli-runtime in your project. Codex loads it when a task matches its description.
Can I use Counterfact CLI Runtime 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 counterfact/api-simulator --skill counterfact-cli-runtime -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/counterfact-cli-runtime, .gemini/skills/counterfact-cli-runtime, .github/skills/counterfact-cli-runtime and .opencode/skills/counterfact-cli-runtime in your project.
What does Counterfact CLI Runtime need to run?
Going by SKILL.md and its folder, Counterfact CLI Runtime needs the command-line tools its instructions call (yarn).
Does Counterfact CLI Runtime 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 Counterfact CLI Runtime 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 Counterfact CLI Runtime use?
Counterfact CLI Runtime 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 Counterfact CLI Runtime use?
About 584 tokens (SKILL.md is roughly 2.3k 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 Counterfact CLI Runtime?
Skills that share tags, products or a category with Counterfact CLI Runtime: ToolJet Marketplace Plugin Builder (ToolJet/ToolJet, 41k stars), Step Parts (earthtojake/text-to-cad, 18k stars), API Designer (Jeffallan/claude-skills, 12k stars) and OpenAPI to MCP Server (mcp-use/mcp-use, 11k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Counterfact CLI Runtime?
counterfact (a GitHub organization) maintains it in counterfact/api-simulator, which has 170 GitHub stars. The repository holds 12 skills in this directory. The repository was last updated on October 8, 2026.
Source: counterfact/api-simulator on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.