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PreClick — An MCP-native URL preflight scanning service for autonomous agents.

by preclick.ai · remote · no sign-in to list tools · v0.3.6 · published by ai.preclick

PreClick scans links for threats and confirms intent match with high accuracy before agents click.

Changes · 2
CompareRegistry entry

6 tools: 2 change things and 4 only read.

Scanned Oct 21, 2026

2 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http preclick https://preclick.ai/mcp

Findings

Matches of fixed checks, with the text they matched.

2 warn
  • Warnurl_scanner_async_scan

    The server marks "url_scanner_async_scan" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"openWorldHint":true}; The description's first verb is "submit": a word for a change.

    What this check looks for
  • Warnurl_scanner_async_scan_with_intent

    The server marks "url_scanner_async_scan_with_intent" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"openWorldHint":true}; The description's first verb is "submit": a word for a change.

    What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

6 tools

Changes things 2Claude Code: ask
  • url_scanner_async_scanSubmit a URL for asynchronous security analysis.1 finding

    Why it is in this group

    • The description's first verb is "submit": a word for a change.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "url_scanner_async_scan" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"openWorldHint":true}; The description's first verb is "submit": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Submit a URL for asynchronous security analysis. Returns immediately with a task_id. Poll with url_scanner_async_task_status to check progress, then url_scanner_async_task_result to get the scan result. Async counterpart of url_scanner_scan for clients without native MCP Tasks support.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: true
  • url_scanner_async_scan_with_intentSubmit a URL with optional user intent for asynchronous security analysis.1 finding

    Why it is in this group

    • The description's first verb is "submit": a word for a change.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "url_scanner_async_scan_with_intent" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"openWorldHint":true}; The description's first verb is "submit": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Submit a URL with optional user intent for asynchronous security analysis. Returns immediately with a task_id. Poll with url_scanner_async_task_status to check progress, then url_scanner_async_task_result to get the scan result. Async counterpart of url_scanner_scan_with_intent for clients without native MCP Tasks support.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: true
Only reads 4Claude Code: allow
  • url_scanner_async_task_resultRetrieve the result of an asynchronous scan task.No findings

    Why it is in this group

    • The description's first verb is "retrieve": a word for reading.
    Description, as the server wrote it
    Retrieve the result of an asynchronous scan task. If completed, returns the full scan result (risk_score, confidence, agent_access_directive, etc.). If still running, returns status with retry_after_ms — call again after that interval. Non-blocking.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: false
  • url_scanner_async_task_statusCheck the status of an asynchronous scan task.No findings

    Why it is in this group

    • The name "url_scanner_async_task_status" says "status": a word for reading.
    Description, as the server wrote it
    Check the status of an asynchronous scan task. Returns the current task status using native MCP task semantics (working, completed, failed, cancelled) without blocking. Use url_scanner_async_task_result to retrieve the result once completed.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: false
  • url_scanner_scanAnalyze a URL for security threats (synchronous, blocks until complete or timeout).No findings

    Why it is in this group

    • The description's first verb is "analyze": a word for reading.
    Description, as the server wrote it
    Analyze a URL for security threats (synchronous, blocks until complete or timeout). Returns risk score, confidence, agent access guidance, and intent_alignment (always not_provided for this tool; use url_scanner_scan_with_intent for intent context). For long-running scans, prefer url_scanner_async_scan which returns immediately with a task_id for polling via url_scanner_async_task_result.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: true
  • url_scanner_scan_with_intentAnalyze a URL for security threats with optional user intent context (synchronous, blocks until complete or timeout).No findings

    Why it is in this group

    • The description's first verb is "analyze": a word for reading.
    Description, as the server wrote it
    Analyze a URL for security threats with optional user intent context (synchronous, blocks until complete or timeout). Returns risk score, confidence, agent access guidance, and intent_alignment. For long-running scans, prefer url_scanner_async_scan_with_intent which returns immediately with a task_id for polling via url_scanner_async_task_result.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • openWorldHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 0.3.6. Values in angle brackets are yours to fill in.

claude mcp add --transport http preclick https://preclick.ai/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__preclick__url_scanner_async_task_result",
      "mcp__preclick__url_scanner_async_task_status",
      "mcp__preclick__url_scanner_scan",
      "mcp__preclick__url_scanner_scan_with_intent"
    ],
    "ask": [
      "mcp__preclick__url_scanner_async_scan",
      "mcp__preclick__url_scanner_async_scan_with_intent"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as preclick. Review it before you use it.