PCSX2 MCP

by snowyegret23

Overview Schema Source Related Servers Discussions Admin

Python

Local

overwrite_memory_from_file

Overwrites emulated system memory with bytes from a file to inject or patch data at a specified address.

Instructions

Overwrite guest memory with bytes read from a local file.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "address": "<address>",
      "file_path": "<file_path>"
    },
    "name": "overwrite_memory_from_file"
  }
}

Input Schema

Name	Required	Default
`target`	No	ee
`address`	Yes
`file_path`	Yes
`max_bytes`	No

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Jul 27, 2026

TDQS

B3.3/5.0

Behavior3/5

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

No annotations provided, so description carries full burden. It discloses the core action and file source but omits potential side effects, required permissions, or constraints like file existence.

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?

Single sentence, front-loaded with the action and resource. No redundant words.

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?

The description is too minimal for a tool with 4 parameters and no output schema. It does not cover return values, error conditions, or constraints, leaving significant gaps for an agent.

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

Parameters2/5

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

Schema description coverage is 0%, so description must compensate. It implicitly covers address and file_path but does not explain target (default 'ee') or max_bytes (null meaning). Adding parameter context would improve this.

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 ('overwrite'), the resource ('guest memory'), and the source ('bytes read from a local file'). It distinguishes from related tools like read_memory and write_memory.

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., write_memory for direct writing). No prerequisites or context provided.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.