Skill

flag

Submits and validates CTF flags via ctf-kit CLI. Saves to flag.txt, marks challenge solved in .ctf/challenge.yaml, and checks formats. Use after finding flags.

Bash

security

cli-tools

npx claudepluginhub mysterionrise/ctf-kit

Tool Access

This skill uses the workspace's default tool permissions.

Preview

Submit and validate a CTF flag.

Supporting Assets

scripts/check-tools.sh

SKILL.md

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Last CommitFeb 22, 2026

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CTF Flag

Submit and validate a CTF flag.

When to Use

Use this command when you:

Have found or computed a flag for a challenge

Want to save and validate a flag value

Need to mark a challenge as solved

Bundled Scripts

check-tools.sh — Verify ctf-kit is installed

Instructions

First verify ctf-kit is available: bash scripts/check-tools.sh

Submit the flag:

ctf flag "$ARGUMENTS"

Review the output:

Flag format validation result
Confirmation that flag.txt was saved
Challenge marked as solved in .ctf/challenge.yaml

After submitting a flag:

Suggest /ctf-kit:status to review progress
Suggest /ctf-kit:writeup to generate a writeup
If in a competition, suggest moving to the next challenge

Options

--path, -p — Challenge directory (default: current directory)

--no-validate — Skip flag format validation

Example Usage

/ctf-kit:flag "flag{s0m3_fl4g_h3r3}" /ctf-kit:flag "picoCTF{example_flag}" --path ./crypto/rsa-baby /ctf-kit:flag "non_standard_flag" --no-validate

Related Commands

/ctf-kit:here — Set up challenge context

/ctf-kit:status — View challenge progress after submission

/ctf-kit:writeup — Generate writeup for solved challenge

CTF Flag

Submit and validate a CTF flag.

When to Use

Use this command when you:

Have found or computed a flag for a challenge
Want to save and validate a flag value
Need to mark a challenge as solved

Bundled Scripts

check-tools.sh — Verify ctf-kit is installed

Instructions

First verify ctf-kit is available: bash scripts/check-tools.sh
Submit the flag:
```
ctf flag "$ARGUMENTS"
```
Review the output:
- Flag format validation result
- Confirmation that flag.txt was saved
- Challenge marked as solved in .ctf/challenge.yaml
After submitting a flag:
- Suggest /ctf-kit:status to review progress
- Suggest /ctf-kit:writeup to generate a writeup
- If in a competition, suggest moving to the next challenge

Options

--path, -p — Challenge directory (default: current directory)
--no-validate — Skip flag format validation

Example Usage

/ctf-kit:flag "flag{s0m3_fl4g_h3r3}"
/ctf-kit:flag "picoCTF{example_flag}" --path ./crypto/rsa-baby
/ctf-kit:flag "non_standard_flag" --no-validate

Related Commands

/ctf-kit:here — Set up challenge context
/ctf-kit:status — View challenge progress after submission
/ctf-kit:writeup — Generate writeup for solved challenge