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0xhackerfren

Frida Game Hacking MCP

by 0xhackerfren

attach

Attach to a running game or application process for memory scanning, value modification, function hooking, and code injection during reverse engineering.

Instructions

Attach to a running process.

Args:
    target: Process name (string) or PID (integer)

Returns:
    Session information.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
targetYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Implementation Reference

  • The primary handler function for the 'attach' MCP tool. It attaches a Frida session to a target process by PID or name, manages session state, handles errors like process not found or permission denied, and returns session details.
    @mcp.tool()
    def attach(target: Union[str, int]) -> Dict[str, Any]:
        """
        Attach to a running process.
        
        Args:
            target: Process name (string) or PID (integer)
        
        Returns:
            Session information.
        """
        global _session
        
        if not FRIDA_AVAILABLE:
            return {"error": "Frida not installed. Run: pip install frida frida-tools"}
        
        if _session.is_attached():
            detach()
        
        try:
            device = get_device()
            
            if isinstance(target, str):
                _session.session = device.attach(target)
                _session.process_name = target
                _session.pid = getattr(_session.session, 'pid', None)
            else:
                _session.session = device.attach(target)
                _session.pid = target
                for proc in device.enumerate_processes():
                    if proc.pid == target:
                        _session.process_name = proc.name
                        break
            
            _session.spawned = False
            return {
                "success": True,
                "pid": _session.pid,
                "process_name": _session.process_name,
                "message": f"Attached to {_session.process_name or target}"
            }
        
        except frida.ProcessNotFoundError:
            return {"error": f"Process not found: {target}"}
        except frida.PermissionDeniedError:
            return {"error": "Permission denied. Try running as administrator."}
        except Exception as e:
            return {"error": f"Failed to attach: {str(e)}"}
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions attaching to a process and returning session information, but fails to detail critical aspects like required permissions, potential side effects (e.g., pausing the process), or error conditions, leaving significant gaps.

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 brief and front-loaded with the core purpose, followed by structured 'Args' and 'Returns' sections. However, the 'Returns' section is somewhat vague ('Session information'), slightly reducing efficiency.

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 the tool's moderate complexity (attaching to processes), no annotations, and an output schema present (which handles return values), the description is minimally adequate. It covers the basic action and parameter semantics but lacks behavioral details, making it incomplete for safe use without additional context.

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?

The description adds meaningful context for the single parameter 'target' by specifying it can be a process name (string) or PID (integer), which clarifies beyond the schema's generic 'anyOf' type. With 0% schema description coverage, this effectively compensates, though it could note format examples.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Attach to') and resource ('a running process'), making the purpose evident. However, it doesn't differentiate from sibling tools like 'detach' or 'spawn' beyond the basic verb, missing explicit sibling distinction.

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 is provided on when to use this tool versus alternatives like 'spawn' (to start a new process) or 'detach' (to disconnect). The description lacks context on prerequisites or exclusions, offering minimal usage direction.

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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