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fuzzmind

fuzzmind-frida-mcp

by fuzzmind

frida_objc_choose

Enumerate live Objective-C instances of a class from the heap of a target process. Specify the class name to retrieve objects for inspection in memory.

Instructions

Find live ObjC instances of a class on the heap via ObjC.chooseSync.

target: process name or pid (string). class_name: exact ObjC class name (e.g. 'NSMutableArray'). limit: max instances to return (default 100).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
targetYes
class_nameYes
limitNo
Behavior2/5

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

No annotations provided. The description mentions it uses ObjC.chooseSync (synchronous), but does not disclose behavioral traits such as side effects, safety, or if it requires a session. With no annotations, the description should provide more transparency.

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 single sentence followed by parameter definitions. No wasted words, though the parameter list could be formatted more clearly.

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?

The description explains what the tool does and its parameters, but lacks information about the return value or output format. Since there is no output schema, the agent is left guessing about the response structure. Adequate for a simple search tool but not complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

All three parameters are explained in the description: target (process name or pid), class_name (exact ObjC class name), limit (max instances, default 100). This fully compensates for the 0% schema coverage.

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 action ('Find') and resource ('live ObjC instances of a class') and distinguishes from siblings like frida_java_choose by specifying ObjC. The verb and resource are specific.

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?

No guidance on when to use this tool versus alternatives (e.g., frida_objc_call_method or frida_java_choose). No prerequisites or conditions are mentioned.

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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