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.

Quality

93%

Does it follow best practices?

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Securityby

Low

Low-risk findings worth noting

Quality

Content

87%Weight 40%Scale 1-3

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

The body is a tight, well-structured instruction-only workflow that assumes Claude's competence and points cleanly to a single real reference. Its only gap is the absence of explicit validation/feedback-loop checkpoints in the iterative extraction workflow.

Suggestions

Add an explicit validate->fix->retry checkpoint in the workflow (e.g. 'After extracting a candidate layer, confirm it parses as the expected payload type; if not, return to channel ranking') to lift workflow clarity to 3.

Make the stop/verification condition a concrete step (e.g. 'Verify the recovered payload reproduces the hidden message end-to-end before stopping') rather than only a Quick Start bullet.

Show a minimal extraction command or tool invocation per channel to strengthen actionability with at least one executable example.

Dimension	Reasoning	Score
Conciseness	The body is lean and assumes Claude's competence, with no explanation of concepts Claude already knows (e.g. what steganography or LSB means); every line is actionable guidance that earns its place.	3 / 3
Actionability	Although there is no code, the instruction-only guidance is concrete and specific ('Rank candidate channels by evidence: alpha, palette, LSB, transform-domain residue...', 'Keep the chain in order: container -> channel or carrier -> extraction -> decompression or decode -> final parse'), which the rubric rewards for instruction-only skills.	3 / 3
Workflow Clarity	A clear numbered Quick Start and a sequenced 3-step Workflow with a stop condition are present, but there is no explicit validate->fix->retry feedback loop; per the rubric, missing validation checkpoints in iterative extraction work caps this at 2 rather than 3.	2 / 3
Progressive Disclosure	Content is well-organized into labeled sections and points to one clearly signaled, one-level-deep reference (references/stego-media.md) that exists and matches its described contents, fitting the simple-skill allowance for a top score.	3 / 3
	Total	11 / 12 Passed

Description

100%Weight 40%Scale 1-3

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

The description is specific, trigger-rich, and explicitly gated to a downstream CTF orchestrator, covering both what it does and when to use it. It earns the top score across all dimensions with no vagueness or over-claims.

Dimension	Reasoning	Score
Specificity	Lists multiple specific concrete actions and channels across media types ('inspect metadata, alpha or palette channels, LSBs, thumbnails, appended trailers, QR fragments, transcoding artifacts, or recover a hidden payload'), matching the anchor for listing multiple specific concrete actions rather than merely naming a domain.	3 / 3
Completeness	It explicitly answers both what ('CTF-sandbox workflow for ... steganography') and when ('Use when the user asks to inspect ... or recover a hidden payload') with an explicit trigger clause, so it is not capped at 2 for a missing 'Use when' clause.	3 / 3
Trigger Term Quality	The 'Use when the user asks to inspect metadata, alpha or palette channels, LSBs, thumbnails, appended trailers, QR fragments' clause gives good coverage of natural CTF/stego terms a user would actually say, matching the highest anchor rather than the partial-coverage anchor.	3 / 3
Distinctiveness Conflict Risk	The media-steganography niche is distinct and scoped via explicit gating ('Use only after $ctf-sandbox-orchestrator ... routed here'), making it unlikely to trigger for the wrong skill.	3 / 3
	Total	12 / 12 Passed

Validation

100%

Warnings & errors only

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

Validation — 16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository: zhaoxuya520/reverse-skill
Path: CTF-Sandbox-Orchestrator/competition-stego-media/SKILL.md
Commit: 6aa1362

Reviewed: 7 days ago

Table of Contents

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