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ouonet

x64dbg MCP Server

by ouonet

search_memory

Search a debuggee's memory for byte patterns or strings using hex patterns with wildcards, ASCII, or Unicode text, with configurable address range and result limit.

Instructions

Search the debuggee's memory for a byte pattern or string. Supports hex patterns with wildcards (e.g. '4D 5A ?? ??') and text strings.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
sessionIdYesSession ID
patternYesHex pattern with optional ?? wildcards, or a text string
searchTypeNoPattern interpretation: hex bytes, ASCII text, or Unicode texthex
startAddressNoStart address (default: image base)
endAddressNoEnd address (default: end of image)
maxResultsNoMaximum number of results (default 100)
Behavior3/5

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

No annotations are provided, so the description must bear the full burden. It discloses pattern syntax and wildcard support but does not mention side effects, performance implications, or that it is a read-only operation. Adequate but not rich.

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 essential information and an illustrative example. No padding; every word contributes to clarity.

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 6 parameters and no output schema, the description covers the core operation but omits what results look like (e.g., list of addresses with matched bytes). It is incomplete for an agent to fully understand the return format.

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%, so parameters are documented. The description adds value with an explicit example ('4D 5A ?? ??') and explains searchType options. This goes beyond the schema's descriptions.

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 clearly states the tool's action: 'Search the debuggee's memory for a byte pattern or string.' It distinguishes from siblings like read_memory or write_memory by focusing on pattern search. Examples of wildcards and text strings make the purpose concrete.

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 (when you want to find a pattern in memory) but does not explicitly state when to use it vs. alternatives like read_memory or analyze_function. No guidance on when not to use it or prerequisites.

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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