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FaceRuler

by faceruler.com · remote · no sign-in to list tools · v1.0.0 · published by com.faceruler

PSL score tiers, face shape classification and looksmaxxing term lookup from FaceRuler.

Changes · 2
CompareRegistry entry

4 tools: 2 change things and 2 only read.

Scanned Oct 21, 2026

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

claude mcp add --transport http faceruler https://faceruler.com/api/mcp

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warnpsl_score_lookup

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

    Matched text

    annotations: {"readOnlyHint":true,"openWorldHint":false}; The name "psl_score_lookup" says "lookup": a word for reading.

    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.

4 tools

Changes things 2Claude Code: ask
  • classify_face_shapeClassify a face into one of 7 shapes (oval, round, square, oblong, heart, diamond, triangle) from three measured outline ratios, with a match % for every shape.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Classify a face into one of 7 shapes (oval, round, square, oblong, heart, diamond, triangle) from three measured outline ratios, with a match % for every shape.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false
  • psl_score_lookupConvert a PSL score (0–8 looksmaxxing face rating scale) into its tier name, approximate population percentile and casual 1–10 equivalent.1 finding

    Why it is in this group

    • The name "psl_score_lookup" says "lookup": a word for reading.
    • The description's first verb is "convert": 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 "psl_score_lookup" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"openWorldHint":false}; The name "psl_score_lookup" says "lookup": a word for reading.

      What this check looks for
    Description, as the server wrote it
    Convert a PSL score (0–8 looksmaxxing face rating scale) into its tier name, approximate population percentile and casual 1–10 equivalent.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false
Only reads 2Claude Code: allow
  • get_face_measurement_toolReturn the link to FaceRuler’s free on-device tool for measuring a real face from one photo (PSL score, face shape, canthal tilt or facial ratios).No findings

    Why it is in this group

    • The name "get_face_measurement_tool" says "get": a word for reading.
    Description, as the server wrote it
    Return the link to FaceRuler’s free on-device tool for measuring a real face from one photo (PSL score, face shape, canthal tilt or facial ratios). Use when the user wants their own face measured.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false
  • lookup_looksmaxxing_termDefine a looksmaxxing / PSL term (e.g.No findings

    Why it is in this group

    • The name "lookup_looksmaxxing_term" says "lookup": a word for reading.
    Description, as the server wrote it
    Define a looksmaxxing / PSL term (e.g. LTN, HTN, Chadlite, canthal tilt, hunter eyes, mog) and link to its full explanation.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false

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 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http faceruler https://faceruler.com/api/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__faceruler__lookup_looksmaxxing_term",
      "mcp__faceruler__get_face_measurement_tool"
    ],
    "ask": [
      "mcp__faceruler__psl_score_lookup",
      "mcp__faceruler__classify_face_shape"
    ],
    "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 faceruler. Review it before you use it.