mcp-diff mcp

v1.0.0 · MCP Tool · developer · registry.pascalai.org

Apply unified diffs to files and parse diff structure. Fuzzy hunk matching tolerates +/-20 line offset. Pure RTL, no external dependencies.

diffpatchunified-difffile-patchcode-diffapply-patch

Input Parameters

Parameter	Type	Description
operationrequired	string	apply: read filePath, apply unified diff, write result to outputPath (default: overwrite source). parse: return hunk structure as JSON. One of: `apply`, `parse`.
filePathoptional	string	Path to the source file to patch. Required for apply.
diffoptional	string	Unified diff string (--- +++ @@ headers). Required for apply and parse.
outputPathoptional	string	Output file path for apply. Omit to overwrite the source file in place.

Output Fields

Field	Type	Description
output	string	Path of the written file (apply only)
lines_before	integer
lines_after	integer
size_bytes	integer
hunk_count	integer
hunks	array[object]

Examples

Apply a patch to a file

// Input
{
  "operation": "apply",
  "filePath": "C:/project/main.pas",
  "diff": "--- a/main.pas\n+++ b/main.pas\n@@ -10,3 +10,3 @@\n-  Old line\n+  New line\n"
}

// Output
{
  "output": "C:/project/main.pas",
  "lines_before": 50,
  "lines_after": 50,
  "size_bytes": 1234
}

Parse a diff to inspect its structure

// Input
{
  "operation": "parse",
  "diff": "--- a/file.txt\n+++ b/file.txt\n@@ -1,3 +1,4 @@\n context\n-removed\n+added\n+extra\n context\n"
}

// Output
{
  "hunk_count": 1,
  "hunks": []
}

Install & Discovery

Install

ppm install mcp-diff

Get JSON Schema

GET /v1/packages/mcp-diff/1.0.0/schema

Discover by keyword

GET /v1/mcp/discover?q=diff

Discovery hint: Install with ppm install mcp-diff or invoke remotely via POST /v1/invoke/mcp-diff on the MCP Service.

PascalAI Usage

uses toolslib;
var Tool := LoadTool('mcp-diff');
var R := Tool.Call(JsonObj(['operation','apply','filePath','main.pas','diff',MyDiff]));
Writeln(R.ToJSON);