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CTF Write-up Generator · ljagiello | DecimalAI

documentationby ljagiello

CTF Write-up Generator

ljagiello/ctf-writeup

Source ljagiello/ctf-skills ↗License MIT

Generates a single standardized submission-style CTF writeup for competition handoff and organizer review. Use after solving a CTF challenge to document the solution steps, tools used, and lessons learned in a structured format.

SkillScore59Maintained

Automatic

Security & AppSec pack

Last verified 9/19/2026

What it changes

Passed 12 of 20 test cases with the skill, and 4 of 20 without it.

Without skill18%

With skill59%

Checks it passed that the model alone missed

The YAML frontmatter sets category to web in lowercase.
The YAML frontmatter category is set to web in lowercase.
The metadata includes difficulty set to easy in lowercase.

and 13 more in the full report

10 fixed3 passed either way8 still failing1 broke

Pass-rate lift: +41 pp
Tokens: +45%
Agent turns: 0%
Response time: +4%

Model gemini-3.6-flashMeasured 9/19/2026v213 of 22 cases passed with skill · 20 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/ljagiello-ctf-writeup/SKILL.md https://app.decimal.ai/s/ljagiello-ctf-writeup/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add ljagiello-ctf-writeup, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/ljagiello-ctf-writeup/ and pins it in .decimal/skills.lock

decimalai skills add ljagiello-ctf-writeup

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/ljagiello-ctf-writeup/SKILL.md https://app.decimal.ai/s/ljagiello-ctf-writeup/SKILL.md

Raw file: /s/ljagiello-ctf-writeup/SKILL.md ↗ · machine-readable summary at /s/ljagiello-ctf-writeup.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 10 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 10

Prompt

Draft a markdown writeup for 'Multi-stage Crypto' in SecCTF 2024 (250 points, medium crypto). I have three python snippets: `net.py` (connects to remote), `math.py` (calculates private exponent), and `decrypt.py` (decrypts ciphertext to get `SecCTF{mult1_st4g3_d3cr4pt}`). Combine these into a standardized submission writeup.

What was checked, without and with the skill
Checked	Without skill	With skill
The solution section contains a single complete Python solving script.	Missed	Passed
The solve script starts from challenge parameters and prints the final flag.	Missed	Passed

case-12 · gemini-3.6-flash · 9/19/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md128 linessingle file

CTF Write-up Generator

Generate a standardized submission-style CTF writeup for a solved challenge.

Default behavior:

During an active competition, optimize for speed, clarity, and reproducibility
Keep writeups short enough that a teammate or organizer can validate the solve quickly
Always produce a submission-style writeup
Prefer one complete solve script from challenge data to final flag

Workflow

Step 1: Gather Information

Collect the following from the current session, challenge files, and user input:

Challenge metadata — name, CTF event, category, difficulty, points, flag format
Solution artifacts — exploit scripts, payloads, screenshots, command output
Timeline — key steps taken, dead ends, pivots

# Scan for exploit scripts and artifacts
find . -name '*.py' -o -name '*.sh' -o -name 'exploit*' -o -name 'solve*' | head -20
# Check for flags in output files
grep -rniE '(flag|ctf|eno|htb|pico)\{' . 2>/dev/null

Step 2: Generate Write-up

Write the writeup file as writeup.md (or writeup-<challenge-name>.md) using the submission template below.

Templates

Submission Format

---

Track record

Benchmark

12 / 20

test cases passed, vs 4 / 20 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 9/16/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

ljagiello / ctf-skills

ctf-writeup/SKILL.md

View on GitHub ↗

License MITImported 9/16/2026Version v2

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

CTF Write-up Generator

Workflow

Step 1: Gather Information

Step 2: Generate Write-up

Templates

Submission Format

Track record

Benchmark

Adoption

SkillSafety

Source

Related skills