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zinja-coder

Apktool MCP Server

by zinja-coder
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Python
Local

modify_smali_file

Modify smali class files in an APKTool project with automatic validation and optional backup for safe reverse engineering.

Instructions

Modify smali file content with validation and backup support.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
class_nameYesFull class name (e.g., com.example.MyClass)
new_contentYesNew content for the smali file
project_dirYesPath to the APKTool project directory
create_backupNoWhether to create a backup of the original file

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. Changed14 schema fields changedv1.0.1
    • addedInput schema / additionalProperties
      Added value: +false
    • addedInput schema / properties / class_name / description
      Added value: +"Full class name (e.g., com.example.MyClass)"
    • removedInput schema / properties / class_name / title
      Removed value: -"Class Name"
    • addedInput schema / properties / create_backup / description
      Added value: +"Whether to create a backup of the original file"
    • removedInput schema / properties / create_backup / title
      Removed value: -"Create Backup"
    • addedInput schema / properties / new_content / description
      Added value: +"New content for the smali file"
    • removedInput schema / properties / new_content / title
      Removed value: -"New Content"
    • addedInput schema / properties / project_dir / description
      Added value: +"Path to the APKTool project directory"
    • removedInput schema / properties / project_dir / title
      Removed value: -"Project Dir"
    • removedInput schema / title
      Removed value: -"modify_smali_fileArguments"
    • addedOutput schema / additionalProperties
      Added value: +true
    • removedOutput schema / properties
      Removed value: -{
-  "result": {
-    "additionalProperties": true,
-    "title": "Result",
-    "type": "object"
-  }
-}
    • removedOutput schema / required
      Removed value: -[
-  "result"
-]
    • removedOutput schema / title
      Removed value: -"modify_smali_fileOutput"
  2. First observedv1.0.0

TDQS

B3.1/5.0
Behavior2/5

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

With no annotations, the description carries the full burden. It mentions 'validation and backup support' but does not explain what validation entails, whether backups are automatic or optional, or any destructive potential (e.g., overwriting files). The behavioral impact of modification is under-specified.

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 a single sentence that is concise and front-loaded with the tool's purpose. However, it could be more structured by separating core function from additional features (validation, backup) without adding unnecessary verbosity.

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

Completeness2/5

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

Given the tool has 4 parameters, 3 required, and an output schema (not described), the description lacks context about return values, error handling, validation criteria, and how backups are managed. It does not provide enough information for an agent to fully understand the tool's behavior and outcomes.

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?

The input schema has 100% description coverage for all four parameters, so the schema already explains each parameter. The description adds only a general mention of 'validation and backup support', which hints at the 'create_backup' parameter but does not add new semantic value beyond the schema.

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 verb 'Modify' and the resource 'smali file content', and it specifically mentions 'validation and backup support', distinguishing it from sibling tools like 'get_smali_file' (read-only) and 'modify_resource_file' (for resources).

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 provides no guidance on when to use this tool versus alternatives, no prerequisites, and no exclusions. It does not mention that this tool is for modifying compiled smali code versus other modification scenarios.

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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