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pwndbg_setflag

Set individual CPU flags (ZF, CF, SF, OF) to 0 or 1 without modifying the entire flags register during debugging.

Instructions

Modify a CPU flag in the flags register.

pwndbg command: setflag (alias: flag) Source: pwndbg/commands/flags.py Category: Register

Allows setting individual flag bits (ZF, CF, SF, OF, etc.) without modifying the entire flags register.

Args: session_id: The UUID of the session. flag: Flag name (e.g. "ZF", "CF", "SF", "OF"). value: Value to set (0 or 1).

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

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
session_idYes
flagYes
valueYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

With no annotations, the description carries full burden. It discloses that the tool modifies a flag and does so without altering the entire register. However, it does not mention potential side effects, permissions, or invalid inputs.

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 concise with a clear header and parameter list. It includes source information (file, category) that may not be essential for an agent, but overall well-structured.

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 simple operation and existence of output schema, the description is adequate but lacks details on error handling, invalid flag names, or session validity.

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 0%, so description must add meaning. It lists parameters with examples ('ZF', 0/1) for flag and value, but session_id is only described as 'The UUID of the session', adding minimal value beyond schema.

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 clearly states the tool modifies a CPU flag in the flags register, using the verb 'Modify' and specifying the resource. It distinguishes from siblings that read flags or modify other state, but does not explicitly differentiate from other state-modifying tools.

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

Usage Guidelines2/5

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

The description implies use for changing individual flags without modifying the entire register, but provides no explicit guidance on when to use this tool versus alternatives, nor 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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