Slash Command

Trailofbits:Ct Check

Detects timing side-channels in cryptographic code

Type: Slash Command
Repository: trailofbits/skills
GitHub stars: 7.3k
License: CC-BY-SA-4.0
Repo last updated: Sep 25, 2026
Source file: plugins/constant-time-analysis/commands/ct-check.md

What Trailofbits:Ct Check is

Trailofbits:Ct Check is a slash command published in the trailofbits/skills repository on GitHub, which has about 7.3k stars. The repository describes itself as: “Trail of Bits Claude Code skills for security research, vulnerability detection, and audit workflows”

A slash command is a reusable prompt saved as a markdown file and run by typing its name after a slash. In Claude Code, custom commands have been merged into skills: a file in .claude/commands/ and a skill folder in .claude/skills/ both create the same kind of command, and existing command files keep working.

Trailofbits:Ct Check gives you a repeatable way to run the same instructions without retyping them, optionally with arguments.

How to install Trailofbits:Ct Check

Claude Code

Download ct-check.md from the repository.
Save it to ~/.claude/commands/ (all projects) or .claude/commands/ (one project). As a skill, you can instead save it as ~/.claude/skills/<name>/SKILL.md.
Run it by typing / followed by its name, with arguments such as <source-file> [--warnings] [--json] [--arch <arch>].

Claude Cowork

Turn the command into a skill: create a folder with the file saved as SKILL.md and zip it.
In Customize → Skills, click +, then upload the ZIP.
Run it from any task with / and the skill name.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from plugins/constant-time-analysis/commands/ct-check.md, shared under the repository's CC-BY-SA-4.0 license. Read the full file on GitHub.

Arguments: $ARGUMENTS

Parse arguments:

Source file (required): Path to source file to analyze
Flags (optional): --warnings, --json, --arch , --opt-level , --func

Invoke the constant-time-analysis skill with these arguments for the full workflow.

Before you install

Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
Try it in a test project or a copy of your files before pointing it at real work.
Pin the version you tested, and review changes before updating.
Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Trailofbits:Ct Check?

Trailofbits:Ct Check is a slash command for Claude Code and Claude Cowork from the trailofbits/skills repository on GitHub. Detects timing side-channels in cryptographic code

How do I install Trailofbits:Ct Check in Claude Code?

Download ct-check.md from the repository. Save it to ~/.claude/commands/ (all projects) or .claude/commands/ (one project). As a skill, you can instead save it as ~/.claude/skills/<name>/SKILL.md. Run it by typing / followed by its name, with arguments such as <source-file> [--warnings] [--json] [--arch <arch>].

Can I use Trailofbits:Ct Check in Claude Cowork?

Turn the command into a skill: create a folder with the file saved as SKILL.md and zip it. In Customize → Skills, click +, then upload the ZIP. Run it from any task with / and the skill name.

Is Trailofbits:Ct Check safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

Similar resources

Browse all skills, subagents, and plugins →

Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under CC-BY-SA-4.0. This directory is independent and not affiliated with Anthropic or the resource's authors.