CtrlK
BlogDocsLog inGet started
Tessl Logo

competition-stego-media

Internal downstream skill for ctf-sandbox-orchestrator. CTF-sandbox workflow for image, audio, video, document, and container steganography. Use when the user asks to inspect metadata, alpha or palette channels, LSBs, thumbnails, appended trailers, QR fragments, transcoding artifacts, or recover a hidden payload from media without blind brute force. Use only after `$ctf-sandbox-orchestrator` has already established sandbox assumptions and routed here.

72

Quality

89%

Does it follow best practices?

Run evals on this skill

Adds up to 20 points to the overall score

View guide

SecuritybySnyk

Low

Low-risk findings worth noting

SKILL.md
Quality
Evals
Security

Quality

Content

86%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A concise, well-structured instruction-only skill with a clear sequenced workflow, explicit validation checkpoints, and a clean one-level reference split. Its main gap is the absence of concrete tooling/commands and an explicit channel-failure retry loop.

Suggestions

Add a few concrete tool commands next to the channel checks (e.g. exiftool for metadata, zsteg/pngcheck for LSB/palette, ffprobe for container layout) so guidance is executable, not just descriptive.

Add an explicit re-rank/retry step in the Inspect Candidate Channels phase for when a candidate channel yields no payload (e.g. "if a channel produces nothing reproducible, demote it and try the next-ranked candidate").

Name the target file extensions (e.g. .png/.bmp/.wav/.mp4/.pdf) in either the description or the checklist to improve trigger-term coverage.

DimensionReasoningScore

Conciseness

Lean and efficient throughout — it never explains what steganography or containers are, assumes Claude's competence, and every line is directive guidance that earns its place.

5 / 5

Actionability

Concrete about what to inspect ("alpha, palette order, RGB or YUV planes, LSBs, spectrogram features, document object streams, video frame deltas") but provides no executable tool commands (e.g. exiftool, zsteg, steghide), leaving the agent to choose tooling.

4 / 5

Workflow Clarity

Clear sequenced phases (Establish Container Truth → Inspect Candidate Channels → Reconstruct Hidden Payload Path) with explicit validation ("Stop when the hidden payload is reproduced, not merely suspected"; "a channel hit is not the same as artifact recovery"), but lacks an explicit re-rank/retry loop when a channel fails.

4 / 5

Progressive Disclosure

Well-structured overview with a single clearly-signaled one-level-deep reference ("Load references/stego-media.md for the media checklist, channel ranking guide, and evidence packaging"), and the referenced file exists and holds the deferred detail.

5 / 5

Total

18

/

20

Passed

Description

92%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong, specific description with explicit what/when trigger guidance and a clear downstream-routing constraint that sharply limits conflict risk. The only gap is slightly incomplete natural-term coverage (no file extensions or lay synonyms).

DimensionReasoningScore

Specificity

Lists multiple concrete actions across media types — "inspect metadata, alpha or palette channels, LSBs, thumbnails, appended trailers, QR fragments, transcoding artifacts, or recover a hidden payload" — giving comprehensive, specific coverage rather than vague language.

5 / 5

Completeness

Explicitly answers both "what" (CTF-sandbox workflow for image/audio/video/document/container steganography) and "when" ("Use when the user asks to inspect... or recover a hidden payload") with concrete trigger phrases.

5 / 5

Trigger Term Quality

Good coverage of terms a CTF user would say (metadata, LSBs, alpha/palette channels, QR fragments, trailers), but misses file extensions and common synonyms like .png/.wav or "hidden message," keeping it just below comprehensive.

4 / 5

Distinctiveness Conflict Risk

Clear niche (media steganography) with an explicit routing constraint — "Use only after $ctf-sandbox-orchestrator has already established sandbox assumptions and routed here" — minimizing overlap with sibling skills.

5 / 5

Total

19

/

20

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
zhaoxuya520/reverse-skill
Reviewed

Table of Contents

Is this your skill?

If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.