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pwndbg_asm

Assembles assembly code into bytes, outputting as hex or string format for shellcode generation.

Instructions

Assemble shellcode into bytes.

pwndbg command: asm Source: pwndbg/commands/asm.py Category: Misc

Assembles the given assembly code and outputs the resulting bytes in the requested format.

Args: session_id: The UUID of the session. shellcode: Assembly code to assemble (e.g. "nop; ret"). format: Output format — "hex" or "string" (default: "hex").

See: https://pwndbg.re/2025.05.30/reference/pwndbg/commands/asm/

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
session_idYes
shellcodeYes
formatNohex

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

With no annotations, the description must disclose behavior. It explains assembling and output format, but does not mention side effects, error handling, or whether it modifies state.

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

Conciseness3/5

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

The description is clear and front-loaded with purpose, but includes extraneous meta-information (command source, category, URL) that could be trimmed for conciseness.

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 the output schema exists, the description does not need return details. However, it lacks context about required architecture or assembly language, which is important for correct usage.

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?

The input schema has 0% description coverage, but the tool description adds meaningful explanations for each parameter, including examples and format options, compensating well for the gap.

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

Purpose4/5

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

The description starts with 'Assemble shellcode into bytes,' clearly indicating its core function. It distinguishes from sibling tools like pwndbg_disassemble by focusing on assembly to bytes, but does not explicitly contrast with others.

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 usage for converting assembly code to bytes, but lacks explicit guidance on when to use this tool versus alternatives or when not to use it.

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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