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fuzzmind

fuzzmind-frida-mcp

by fuzzmind

frida_objc_create_block

Create an Objective-C block at runtime with custom return type, argument types, and JavaScript implementation for dynamic code injection in Frida.

Instructions

Create an ObjC block at runtime via new ObjC.Block.

target: process name or pid (string). return_type: return type (e.g. 'void', 'int', 'object'). arg_types: list of argument type strings. js_body: JavaScript function body for the block implementation. Returns the block's handle address.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
targetYes
return_typeYes
arg_typesYes
js_bodyYes
Behavior2/5

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

Without annotations, description carries full burden. It states that it creates a block and returns a handle address, but fails to disclose side effects (e.g., memory allocation in target process), cleanup requirements, permissions, or potential errors. Limited to basic functionality.

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?

Description is very concise: one sentence for purpose, then bullet-like parameter lines, and a return statement. No fluff, every sentence adds value. Well-structured for quick comprehension.

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 no annotations or output schema, the description covers the essential create action, parameter meanings, and return value. However, it lacks behavioral details, usage context, error handling, and lifecycle information about the created block. Adequate but has gaps.

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 0%, so description compensates well. Each parameter is explained with type and examples: target (string), return_type (with examples like 'void'), arg_types (list of strings), js_body (function body). Adds meaningful context beyond schema names.

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?

Description clearly states 'Create an ObjC block at runtime via new ObjC.Block,' specifying the verb and resource. It distinguishes from sibling tools like frida_objc_call_method or frida_objc_choose, which perform different operations. Parameter details further reinforce the purpose.

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 explicit guidance on when to use this tool versus alternatives. Does not mention prerequisites, typical scenarios, or conditions for use. Sibling tools are numerous, but no comparison or context is provided.

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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