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Tokeii0

capstone-mcp-server

by Tokeii0

analyze_shellcode_hex

Disassemble shellcode from hex input, detect patterns like NOP sleds, syscalls, and null bytes, and generate statistics. Supports multiple architectures and base address customization.

Instructions

Comprehensively analyze shellcode: disassembly + pattern detection + statistics.

Detects NOP sleds, syscalls, common shellcode jump patterns, null bytes, etc.

Args: hex_code: Hex-encoded shellcode. arch: CPU architecture. Default: x86_64. base_address: Base address. Default: "0".

Returns: JSON-formatted shellcode analysis results.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
hex_codeYes
archNox86_64
base_addressNo0

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

No annotations provided, so description carries full burden. It mentions analysis and JSON return but does not disclose behavioral traits like side effects, permissions, or limitations (e.g., size limits). Minimal disclosure beyond what is obvious.

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?

Well-structured with summary, feature list, and args section. Front-loaded with key purpose. Could be slightly more concise by omitting common examples, but remains readable and informative.

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?

Adequate for a tool with 3 params and no annotations, but lacks details on return structure beyond 'JSON-formatted analysis results'. With high sibling count, more context on output fields would improve agent decision-making.

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

Parameters4/5

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

Schema coverage is 0%, but description defines each parameter clearly: hex_code as hex-encoded shellcode, arch with default x86_64, base_address with default 0. Adds meaning beyond schema, though could list valid arch values or note dependency on list_supported_architectures.

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?

Clearly states comprehensive analysis of shellcode including disassembly, pattern detection, and statistics. Lists specific patterns (NOP sleds, syscalls, jump patterns, null bytes) and distinguishes from sibling tools like disassemble_hex which likely only disassembles.

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?

Implies usage for shellcode analysis but does not explicitly compare with alternatives like disassemble_hex or find_rop_gadgets_hex. No when-not-to-use or prerequisite information provided.

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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