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jpegadv_f5_detect

Detects F5 steganography in JPEG files by analyzing DCT coefficient histograms for characteristic zero excess and dip at +/-1 from matrix embedding.

Instructions

F5 steganography detection. F5 embeds data by decrementing the absolute values of DCT coefficients toward zero (shrinkage). Detects the characteristic excess of zeros relative to near-zero coefficients and the histogram dip at +/-1 that F5 matrix embedding produces.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
file_pathYesAbsolute path to the JPEG file to analyze for F5 steganography
Behavior2/5

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

No annotations provided, so description carries the full burden. It explains the detection logic but does not disclose whether the tool modifies the file, requires specific file attributes, or describes side effects. An agent needs to infer read-only behavior from context.

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?

Two sentences: first states purpose, second provides technical mechanism. No wasted words, front-loaded with essential information.

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

Completeness3/5

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

Adequately explains what is detected and how, but does not specify the output format (e.g., boolean, confidence score, or evidence). For a complex detection tool, this omission may require the agent to assume standard output conventions.

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?

Single parameter 'file_path' is fully described in the schema (absolute path to JPEG file). The description adds no additional meaning beyond the schema's parameter description. Baseline score of 3 is appropriate due to complete schema coverage.

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?

Description clearly states it detects F5 steganography, explains the embedding technique (decrementing DCT coefficients) and the detection method (excess zeros, histogram dip). Distinguishes from sibling tools like jpegadv_jsteg_detect by specifying F5-specific signs.

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

Usage Guidelines3/5

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

No explicit guidance on when to use this tool versus alternatives (e.g., other JPEG steganography detectors). Does not mention prerequisites or false positive considerations. Adequate for a direct detection task but lacks comparative context.

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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