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badchars

living-off-the-land-lolbins-mcp-server

by badchars

find_native_crypto

Identify built-in cryptographic and encoding techniques in LOL binaries such as certutil and openssl. Filter by platform and operation to locate encode, decode, encrypt, decrypt, or hash methods.

Instructions

Find native cryptographic and encoding techniques using LOL binaries — certutil, openssl, gpg, base64, PowerShell.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
platformNoTarget platform for cryptographic techniquesall
operationNoCryptographic operation to search forencode
target_binaryNoSpecific binary to search for cryptographic capabilities
Behavior2/5

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

No annotations are provided, so the description carries full burden. It discloses no behavioral traits such as whether the tool modifies state, requires authentication, or returns a list vs. detailed info. The description is purely declarative.

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?

Single sentence with no fluff; front-loaded with verb and purpose. Every word serves a purpose.

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?

The description lacks details on output format, search behavior, or parameter interactions. For a tool with no output schema, more context is needed for effective 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?

Schema covers all parameters (100%), so baseline is 3. The description adds no additional parameter meaning beyond listing example binaries; it does not elaborate on how parameters like 'platform' or 'operation' interact.

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 uses a specific verb ('Find') and resource ('native cryptographic and encoding techniques'), names example binaries, and clearly differentiates from sibling tools focused on other attack techniques.

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 for situations requiring native crypto/encoding techniques, but provides no explicit when-to-use or when-not-to-use guidance, nor mentions alternatives among siblings.

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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