# autofix_file

A write tool on the TwinCAT Validator MCP Server MCP server.

Agent View of the PolicyLayer registry record for `autofix_file`. HTML page: https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/autofix-file

## Facts

- Tool: `autofix_file`
- Server: TwinCAT Validator MCP Server (`agenticcontrolio/twincat-validator-mcp`) — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp.md
- Homepage: https://github.com/agenticcontrolio/twincat-validator-mcp
- Risk category: Write (Medium risk)
- Registry record: grade C, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "autofix_file",
    "arguments": {}
  }
}
```

## Why autofix_file is rated Medium

The tool appears to automatically fix TwinCAT XML files based on validation rules. This is a Write operation (creates or modifies data reversibly) rather than Destructive, since fixes are typically restorable via version control and the server emphasizes 'safe fixes.' Severity is medium because misconfiguration could apply unintended transformations to industrial automation code, affecting system behavior, though…

From the tool's own definition: "Tool named 'autofix_file' in a TwinCAT validation context. Sibling tools include 'autofix_batch' and 'check_specific', and the server description states it 'apply[s] safe fixes' to TwinCAT 3 XML files."

## Use case

AI agents use autofix_file to create or update resources in TwinCAT Validator MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your TwinCAT Validator MCP Server environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches TwinCAT Validator MCP Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "autofix_file": {
      "limits": [
        {
          "counter": "autofix_file_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on TwinCAT Validator MCP Server (15)

- `process_twincat_batch` — Execute — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/process-twincat-batch.md
- `verify_determinism_batch` — Execute — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/verify-determinism-batch.md
- `process_twincat_single` — Other — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/process-twincat-single.md
- `check_specific` — Read — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/check-specific.md
- `get_context_pack` — Read — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/get-context-pack.md
- `get_effective_oop_policy` — Read — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/get-effective-oop-policy.md
- `get_validation_summary` — Read — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/get-validation-summary.md
- `lint_oop_policy` — Read — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/lint-oop-policy.md
- `suggest_fixes` — Read — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/suggest-fixes.md
- `validate_batch` — Read — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/validate-batch.md
- `validate_file` — Read — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/validate-file.md
- `validate_for_import` — Read — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/validate-for-import.md
- `autofix_batch` — Write — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/autofix-batch.md
- `extract_methods_to_xml` — Write — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/extract-methods-to-xml.md
- `generate_skeleton` — Write — https://policylayer.com/tools/agenticcontrolio-twincat-validator-mcp/generate-skeleton.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=agenticcontrolio-twincat-validator-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/agenticcontrolio-twincat-validator-mcp