write_file

✈ Glider MCP v6.4.0

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[solution]

Writes a .cs file under the loaded root. Uses preview-first behavior by default and explicitly updates or reloads the workspace after applyChanges=true.

Try this tool in Playground.

Parameters

Name	Type	Required	Description
filePath	string	Yes	File path to write. Can be absolute or relative to the loaded root.
content	string	Yes	Full file contents to write.
applyChanges	boolean	No	If true, writes the file to disk. If false, returns a preview only. Default is false.
createIfMissing	boolean	No	If true, creates a new file when it does not already exist. Default is false.
includeDiff	boolean	No	Include unified diff output in the response. Default is true.
maxDiffChars	number	No	Maximum diff characters to return. Use 0 for unlimited. Default is 50000.
pathStyle	string	No	Path style: 'absolute' (default) or 'relative' (to solution root).

Examples

Preview a file edit without writing

Request 
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "write_file",
    "arguments": {
      "filePath": "/Users/dev/MyProject/Program.cs",
      "content": "namespace MyProject;\n\npublic class Program { }"
    }
  }
}

Response 
{
  "success": true,
  "data": {
    "filePath": "/Users/dev/MyProject/Program.cs",
    "changed": true,
    "applied": false,
    "created": false,
    "filesChanged": 1,
    "unifiedDiff": "--- /Users/dev/MyProject/Program.cs\n+++ /Users/dev/MyProject/Program.cs\n@@ ...",
    "changedFiles": [
      {
        "filePath": "/Users/dev/MyProject/Program.cs",
        "changeCount": 1,
        "diff": "--- /Users/dev/MyProject/Program.cs\n+++ /Users/dev/MyProject/Program.cs\n@@ ..."
      }
    ],
    "workspaceUpdate": {
      "kind": "preview",
      "updated": false,
      "inWorkspaceBefore": true,
      "inWorkspaceAfter": true,
      "message": null
    }
  },
  "meta": {
    "durationMs": 112,
    "cancelled": false,
    "timedOut": false,
    "timeoutMs": 1200000
  },
  "error": null
}

Apply a file edit

Request 
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "write_file",
    "arguments": {
      "filePath": "/Users/dev/MyProject/Program.cs",
      "content": "namespace MyProject;\n\npublic class Program { }",
      "applyChanges": true
    }
  }
}

Response 
{
  "success": true,
  "data": {
    "filePath": "/Users/dev/MyProject/Program.cs",
    "changed": true,
    "applied": false,
    "created": false,
    "filesChanged": 1,
    "unifiedDiff": "--- /Users/dev/MyProject/Program.cs\n+++ /Users/dev/MyProject/Program.cs\n@@ ...",
    "changedFiles": [
      {
        "filePath": "/Users/dev/MyProject/Program.cs",
        "changeCount": 1,
        "diff": "--- /Users/dev/MyProject/Program.cs\n+++ /Users/dev/MyProject/Program.cs\n@@ ..."
      }
    ],
    "workspaceUpdate": {
      "kind": "preview",
      "updated": false,
      "inWorkspaceBefore": true,
      "inWorkspaceAfter": true,
      "message": null
    }
  },
  "meta": {
    "durationMs": 112,
    "cancelled": false,
    "timedOut": false,
    "timeoutMs": 1200000
  },
  "error": null
}

Create a new file and apply the change

Request 
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "write_file",
    "arguments": {
      "filePath": "src/NewType.cs",
      "content": "namespace MyProject;\n\npublic class NewType { }",
      "applyChanges": true,
      "createIfMissing": true,
      "pathStyle": "relative"
    }
  }
}

Response 
{
  "success": true,
  "data": {
    "filePath": "/Users/dev/MyProject/Program.cs",
    "changed": true,
    "applied": false,
    "created": false,
    "filesChanged": 1,
    "unifiedDiff": "--- /Users/dev/MyProject/Program.cs\n+++ /Users/dev/MyProject/Program.cs\n@@ ...",
    "changedFiles": [
      {
        "filePath": "/Users/dev/MyProject/Program.cs",
        "changeCount": 1,
        "diff": "--- /Users/dev/MyProject/Program.cs\n+++ /Users/dev/MyProject/Program.cs\n@@ ..."
      }
    ],
    "workspaceUpdate": {
      "kind": "preview",
      "updated": false,
      "inWorkspaceBefore": true,
      "inWorkspaceAfter": true,
      "message": null
    }
  },
  "meta": {
    "durationMs": 112,
    "cancelled": false,
    "timedOut": false,
    "timeoutMs": 1200000
  },
  "error": null
}

Response Notes

Returns diff output plus workspace update status after preview or apply

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