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jpegadv_outguess_detect

Detect OutGuess steganography in JPEG files by analyzing second-order statistics and inter-block DCT coefficient correlations to uncover hidden data.

Instructions

OutGuess steganography detection. OutGuess embeds data in DCT coefficients and adjusts unused coefficients to preserve first-order statistics. Detects by analyzing second-order statistics (inter-block coefficient correlations) that OutGuess disrupts, and checks for preserved histogram with disrupted spatial correlations.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
file_pathYesAbsolute path to the JPEG file to analyze for OutGuess steganography
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description explains the internal detection method (second-order statistics, histogram preservation), which provides some behavioral insight. However, it does not state external behaviors like whether the tool is read-only, or what it returns (e.g., boolean, confidence). With no annotations provided, the description should have covered these aspects more thoroughly.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely concise: two sentences, no wasted words. The first sentence states the purpose, the second adds technical context. It is front-loaded and efficient.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (steg detection), the description omits critical information about return values or output format. Without an output schema, the agent cannot know what to expect from the tool, making it incomplete for practical use.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The single parameter 'file_path' is fully described in the schema (100% coverage). The description adds no additional semantic detail beyond the schema, so the baseline score of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool detects OutGuess steganography in JPEG files, with a specific verb ('detection') and resource. It explains the detection methodology, distinguishing it from sibling tools that target different steganography methods like F5 or JSteg.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description lacks any explicit guidance on when to use this tool versus alternatives. It does not mention prerequisites, false positives, or situations where other detection tools might be more appropriate, leaving the agent without decision support.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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