get_diagnostics

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[diagnostics]

Gets diagnostics (warnings, errors) for the loaded solution/project. Use includeAnalyzers=true to include analyzer/IDE diagnostics. Workspace load diagnostics are available via server_status with includeWorkspaceDiagnostics=true.

Why this tool exists

Diagnostics are the fastest objective signal that a change broke something or that an existing hotspot needs attention.

How it helps the agent

The model can ask for filtered, paged, or grouped diagnostics before and after edits instead of waiting for a full build transcript.

Try it locally in the GliderMCP playground

Parameters

Name	Type	Required	Description
filePath	string	No	Optional file path filter.
projectName	string	No	Optional project name filter.
includeAnalyzers	boolean	No	Include analyzer/IDE diagnostics. Default is false.
summaryOnly	boolean	No	When true, returns summary counts only. Default is false.
severity	string	No	Minimum severity: 'error', 'warning', 'info', or 'hidden'. Default is 'warning'.
category	string	No	Optional category filter (e.g., 'Compiler', 'Style').
idPrefix	string	No	Optional diagnostic ID prefix filter (e.g., 'CS', 'CA', 'IDE').
pathStyle	string	No	Path style: 'absolute' (default) or 'relative' (to solution root).
sortBy	string	No	Optional sort: 'severity', 'filePath', 'id', 'lineNumber', 'projectName'.
sortOrder	string	No	Sort order: 'asc' (default) or 'desc'.
skip	number	No	Pagination offset. Default is 0.
take	number	No	Pagination size. Default is 200.

Examples

Get warnings and errors (default)

Request 
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_diagnostics",
    "arguments": {}
  }
}

Response 
{
  "success": true,
  "data": {
    "diagnosticCount": 3,
    "errorCount": 1,
    "warningCount": 2,
    "infoCount": 0,
    "paging": {
      "skip": 0,
      "take": 200,
      "returned": 3,
      "total": 3
    },
    "diagnostics": [
      {
        "id": "CS1002",
        "severity": "Error",
        "message": "; expected",
        "filePath": "/path/to/File.cs",
        "lineNumber": 42,
        "column": 17,
        "endLineNumber": 42,
        "endColumn": 18,
        "category": "Syntax",
        "projectName": "MyProject"
      }
    ]
  },
  "meta": {
    "durationMs": 123,
    "cancelled": false,
    "timedOut": false,
    "timeoutMs": 1200000
  },
  "error": null
}

Get error diagnostics only

Request 
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_diagnostics",
    "arguments": {
      "severity": "error"
    }
  }
}

Response 
{
  "success": true,
  "data": {
    "diagnosticCount": 3,
    "errorCount": 1,
    "warningCount": 2,
    "infoCount": 0,
    "paging": {
      "skip": 0,
      "take": 200,
      "returned": 3,
      "total": 3
    },
    "diagnostics": [
      {
        "id": "CS1002",
        "severity": "Error",
        "message": "; expected",
        "filePath": "/path/to/File.cs",
        "lineNumber": 42,
        "column": 17,
        "endLineNumber": 42,
        "endColumn": 18,
        "category": "Syntax",
        "projectName": "MyProject"
      }
    ]
  },
  "meta": {
    "durationMs": 123,
    "cancelled": false,
    "timedOut": false,
    "timeoutMs": 1200000
  },
  "error": null
}

Summary view by project and severity

Request 
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_diagnostics",
    "arguments": {
      "summaryOnly": true,
      "severity": "warning"
    }
  }
}

Response 
{
  "success": true,
  "data": {
    "diagnosticCount": 3,
    "errorCount": 1,
    "warningCount": 2,
    "infoCount": 0,
    "paging": {
      "skip": 0,
      "take": 200,
      "returned": 3,
      "total": 3
    },
    "diagnostics": [
      {
        "id": "CS1002",
        "severity": "Error",
        "message": "; expected",
        "filePath": "/path/to/File.cs",
        "lineNumber": 42,
        "column": 17,
        "endLineNumber": 42,
        "endColumn": 18,
        "category": "Syntax",
        "projectName": "MyProject"
      }
    ]
  },
  "meta": {
    "durationMs": 123,
    "cancelled": false,
    "timedOut": false,
    "timeoutMs": 1200000
  },
  "error": null
}

Response Notes

Returns compiler and analyzer diagnostics, optionally with paging and filtering. Workspace load diagnostics are not included.

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