PCSX2 MCP

by snowyegret23

Overview Schema Source Related Servers Discussions Admin

Python

Local

memory_diff

Snapshot a guest memory range on first call, then compare and clear on second call to detect changes.

Instructions

Snapshot and diff a guest memory range. First call saves, second call compares and clears.

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>",
      "length": "<length>"
    },
    "name": "memory_diff"
  }
}

Input Schema

Name	Required	Default
`name`	No	default
`reset`	No
`length`	Yes
`target`	No	ee
`address`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Jul 27, 2026

TDQS

A3.7/5.0

Behavior4/5

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

Without annotations, the description fully discloses the tool's behavior: it saves a snapshot on first call and diffs/clears on second. This is sufficient for understanding the lifecycle. The 'clears' effect is mentioned, so side effects are transparent.

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 extremely concise with two short sentences. It is front-loaded with the core action and structured logically, with every sentence adding value.

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 complexity of a two-step operation and no output schema, the description should explain parameter usage and expected output. It fails to do so, leaving the agent without crucial details to invoke the tool correctly.

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

Parameters1/5

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

The description provides no information about any of the 5 parameters (address, length, name, reset, target), despite zero schema description coverage. The agent must infer parameter meaning solely from the schema, which lacks descriptions.

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 tool's function: 'Snapshot and diff a guest memory range. First call saves, second call compares and clears.' This is specific and distinguishes it from sibling tools like read_memory or dump_memory that do not perform diffs.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description explicitly explains the two-call pattern ('First call saves, second call compares and clears'), providing clear guidance on when to use the tool. However, it does not mention when not to use it or suggest alternatives for static memory inspection.

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