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bpcs_threshold

Analyzes an image's bit plane to find the complexity threshold where BPCS steganography is most detectable. Tests multiple thresholds and spots suspicious block ratios.

Instructions

Complexity threshold analysis for BPCS steganalysis. Tests multiple threshold values and analyzes how the complex/simple block ratio changes. Finds the optimal threshold boundary where BPCS embedding would be most detectable, and identifies threshold ranges that produce suspicious ratios.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
planeNoBit plane to analyze: 0=LSB, 7=MSB (default: 0)
channelNoColor channel: 0=R, 1=G, 2=B (default: 0)
file_pathYesPath to image file (PNG or JPEG) for threshold analysis
Behavior2/5

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

With no annotations provided, the description carries the full burden of disclosing behavior. It explains the analysis process (testing thresholds, analyzing ratio changes) but does not state that the tool is read-only (no modifications to files) or any potential side effects. Additional context like required permissions or performance impact is missing.

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

Conciseness4/5

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

The description is two sentences, concise and front-loaded with the core purpose. It avoids unnecessary words. However, it could be slightly more compact by integrating the second and third sentences, but it remains efficient.

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?

Given no output schema and the tool's analytical nature, the description provides an overview of what it does but lacks detail on the output format (e.g., what kind of data is returned). It mentions identifying suspicious ratios but not how they are presented. The tool's complexity warrants a bit more detail on outputs.

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?

Schema coverage is 100%, meaning each parameter is described in the schema. The description adds general context about the tool's purpose but does not elaborate on the specific parameters (plane, channel, file_path) beyond what the schema provides. Baseline 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's purpose: complexity threshold analysis for BPCS steganalysis. It uses specific verbs like 'tests', 'analyzes', 'finds', and 'identifies', and distinguishes from sibling bpcs tools by focusing on threshold boundary and suspicious ratios.

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?

The description implies the tool is used for threshold analysis to find detectability boundaries, but it does not explicitly state when to use it versus other bpcs tools (e.g., bpcs_detect, bpcs_complexity_map) or provide when-not-to-use guidance. No alternatives are mentioned.

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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