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ouonet

x64dbg MCP Server

by ouonet

collect_bp_args

Trace repeated function calls by collecting a memory expression at each breakpoint hit, with default support for reading wchar_t* arguments from the x86 stack.

Instructions

Continue execution in a loop, collecting a memory expression at each breakpoint hit. Use this to trace repeated calls (e.g. AddMoudle, GetClassObject). The default expr 'ptr_utf16@[esp+4]' reads a wchar_t* arg from the x86 stack.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
sessionIdYesSession ID
exprNoExpression to read at each hit: 'ptr_utf16@[esp+4]' (default), 'utf16@<addr>', or any numeric x64dbg expr
maxHitsNoStop after this many hits (default 200)
timeoutSecNoPer-hit timeout in seconds (default 10)
Behavior4/5

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

Explains the looping behavior and default expression. No annotations provided, so description carries full burden; adequately describes the main behavior without destructive implications.

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?

Two sentences, front-loaded with purpose, no wasted words. Example included efficiently.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Adequate for a tool with 4 parameters and no output schema; covers essential behavior but does not specify return format or collection result details.

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 100%, but description adds value by clarifying default expr and usage context (e.g., 'ptr_utf16@[esp+4]' for x86 stack).

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?

Describes the tool as continuing execution in a loop and collecting a memory expression at each breakpoint hit, with a specific use case example. Clearly distinguishes from siblings like trace_execution.

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

Usage Guidelines4/5

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

Provides explicit use case ('trace repeated calls') and a concrete example, but does not mention when not to use or alternative tools.

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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