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attach_to_process

Attach to a running process by ID to enable dynamic instrumentation for runtime analysis, reverse engineering, and application interaction through Frida's capabilities.

Instructions

Attach to a process by ID.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
pidYesThe ID of the process to attach to.
device_idNoOptional ID of the device where the process is running. Uses smart selection when omitted.

Implementation Reference

  • The @mcp.tool()-decorated function that implements attaching to a process by PID using Frida's device.attach(pid). Includes inline schema via Pydantic Field and handles device resolution and errors.
    @mcp.tool()
    def attach_to_process(
        pid: int = Field(description="The ID of the process to attach to."),
        device_id: Optional[str] = Field(
            default=None,
            description="Optional ID of the device where the process is running. Uses smart selection when omitted.",
        ),
    ) -> dict:
        """Attach to a process by ID."""
        try:
            device = _resolve_device_or_raise(device_id)
            device.attach(pid)
            return {
                "pid": pid,
                "success": True,
                "is_detached": False,  # New session is not detached
            }
        except Exception as e:
            return {"success": False, "error": str(e)}
Behavior2/5

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

With no annotations, the description carries full burden but provides minimal behavioral insight. 'Attach' implies a connection or interaction, but it doesn't disclose if this is for read-only monitoring, debugging, requires specific permissions, affects process state, or has side effects like pausing execution. Critical details for safe tool invocation are missing.

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?

The description is a single, direct sentence with zero wasted words. It's appropriately sized and front-loaded, making it easy to parse quickly. Every word earns its place by conveying the core action.

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 no annotations, no output schema, and a potentially complex action like 'attach to a process', the description is incomplete. It doesn't explain what 'attach' entails, what the expected outcome is, or any prerequisites (e.g., needing an existing session). For a tool that likely involves system-level operations, more context is needed for safe and effective use.

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?

Schema description coverage is 100%, so the schema fully documents parameters (pid and device_id). The description adds no additional meaning beyond implying 'ID' refers to 'pid', which is already clear from the schema. Baseline score of 3 applies as the schema handles parameter semantics adequately.

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

Purpose3/5

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

The description 'Attach to a process by ID' states a clear verb ('Attach') and resource ('process'), but it's vague about what 'attach' means operationally. It doesn't differentiate from siblings like 'create_interactive_session' or 'execute_in_session', which might involve similar process interactions. The purpose is understandable but lacks specificity.

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. For example, it doesn't clarify if this is for debugging, monitoring, or control purposes, or how it relates to siblings like 'create_interactive_session' or 'enumerate_processes'. The agent must infer usage from context alone.

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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