useSignal
QR codes, JSON diff/format, hashes, JWT, cron, timestamps, placeholders, flowcharts, forms, regex.
使うべきか
品質と安全性
検出事項（3）
- HIGHTool poisoning patterns detected
- MEDIUMTool 'usesignal_placeholder_image' description contains placeholder textusesignal_placeholder_image 内
- INFOTool description contains placeholder or incomplete textusesignal_placeholder_image 内
ツール定義とプロトコルへの準拠に関する自動分析に基づいています。
コンテキストコスト
これは、サーバーのツールがモデルのコンテキストに読み込まれるたびに消費されるおおよそのトークン数です。数が多いほど、ほかのタスクに使える注意が減ります。
インストール
ワンクリックインストール
これを `claude_desktop_config.json` ファイルに追加してください:
{
"mcpServers": {
"usesignal": {
"url": "https://www.usesignal.dev/mcp"
}
}
}リモートエンドポイント
https://www.usesignal.dev/mcpstreamable-httpできること
ツール一覧
ツール（12）
🟢usesignal_generate_form(json, title, overrides)
Generate an editable form from a JSON object. Returns nested field paths, JSON Schema, HTML, React JSX and config exports. Arrays and nulls use JSON textareas. Values are processed in memory; avoid secrets. To show an interactive preview, call usesignal_open_workbench with this result input.
入力スキーマ
{
"type": "object",
"properties": {
"json": {
"type": "string",
"maxLength": 50000
},
"title": {
"type": "string",
"maxLength": 120,
"default": "Generated form"
},
"overrides": {
"type": "array",
"items": {
"type": "object",
"properties": {
"path": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 9
},
"label": {
"type": "string",
"maxLength": 120
},
"type": {
"type": "string",
"enum": [
"text",
"email",
"number",
"checkbox",
"textarea"
]
},
"required": {
"type": "boolean"
}
},
"required": [
"path"
],
"additionalProperties": false
},
"maxItems": 100,
"default": []
}
},
"required": [
"json"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_generate_colors(baseColor)
Generate light and dark semantic color tokens from a six-digit hex brand color. Returns a shade scale, measured text contrast checks and CSS, JSON and Tailwind exports. This measures listed color pairs only, not whole-page accessibility. Call usesignal_open_workbench with the result input to preview.
入力スキーマ
{
"type": "object",
"properties": {
"baseColor": {
"type": "string",
"pattern": "^#[0-9a-fA-F]{6}$"
}
},
"required": [
"baseColor"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_test_regex(pattern, flags, text, tests)
Execute a JavaScript regular expression against text and expected match/non-match test cases. Returns indexed matches and capture groups. Flags use JavaScript semantics. Execution times out after 500ms. Call usesignal_open_workbench with result input to highlight matches.
入力スキーマ
{
"type": "object",
"properties": {
"pattern": {
"type": "string",
"maxLength": 1000
},
"flags": {
"type": "string",
"maxLength": 8,
"default": "g"
},
"text": {
"type": "string",
"maxLength": 20000
},
"tests": {
"type": "array",
"items": {
"type": "object",
"properties": {
"text": {
"type": "string",
"maxLength": 2000
},
"shouldMatch": {
"type": "boolean"
}
},
"required": [
"text",
"shouldMatch"
],
"additionalProperties": false
},
"maxItems": 50,
"default": []
}
},
"required": [
"pattern",
"text"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_generate_qr(type, values, dark, light, moduleStyle, ...)
Generate a scannable QR code for a link, text, Wi-Fi network, contact card (vCard), email, SMS, phone number, WhatsApp chat or UPI payment. Returns the encoded payload, an SVG file and a PNG preview image. values by type: url{url}; text{text}; wifi{ssid,password,security:WPA|WEP|nopass,hidden}; vcard{firstName,lastName,phone,email,org,title,website,address}; email{to,subject,body}; sms{phone,message}; phone{phone}; whatsapp{phone,message}; upi{vpa,name,amount,note}.
入力スキーマ
{
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"url",
"text",
"wifi",
"upi",
"vcard",
"whatsapp",
"email",
"sms",
"phone"
]
},
"values": {
"type": "object",
"additionalProperties": {
"anyOf": [
{
"type": "string",
"maxLength": 2000
},
{
"type": "boolean"
},
{
"type": "number"
}
]
}
},
"dark": {
"type": "string",
"pattern": "^#[0-9a-fA-F]{6}$",
"default": "#111111"
},
"light": {
"$ref": "#/properties/dark",
"default": "#FFFFFF"
},
"moduleStyle": {
"type": "string",
"enum": [
"square",
"rounded",
"dots"
],
"default": "square"
},
"errorCorrection": {
"type": "string",
"enum": [
"L",
"M",
"Q",
"H"
],
"default": "M"
},
"margin": {
"type": "integer",
"minimum": 0,
"maximum": 16,
"default": 4
}
},
"required": [
"type",
"values"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_encode_decode(operation, text)
Exact text transforms: Base64 encode/decode (UTF-8), URL encode/decode, decode a JWT header and payload with readable exp/iat/nbf dates (the signature is not verified), or hash text with MD5, SHA-1, SHA-256 and SHA-512. Use this instead of computing hashes or Base64 by hand.
入力スキーマ
{
"type": "object",
"properties": {
"operation": {
"type": "string",
"enum": [
"base64_encode",
"base64_decode",
"url_encode",
"url_decode",
"jwt_decode",
"hash"
]
},
"text": {
"type": "string",
"maxLength": 100000
}
},
"required": [
"operation",
"text"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_explain_cron(expression, timeZone, count)
Explain a standard 5-field cron expression (minute hour day-of-month month day-of-week) in plain English and list its next run times in a given time zone, handling daylight saving time.
入力スキーマ
{
"type": "object",
"properties": {
"expression": {
"type": "string",
"maxLength": 200
},
"timeZone": {
"type": "string",
"maxLength": 64,
"default": "UTC",
"description": "IANA time zone, e.g. Asia/Kolkata or America/New_York"
},
"count": {
"type": "integer",
"minimum": 1,
"maximum": 20,
"default": 5
}
},
"required": [
"expression"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_convert_timestamp(value, timeZone)
Convert a Unix timestamp (seconds or milliseconds) or an ISO 8601 date into ISO, UTC, epoch seconds/milliseconds, a relative time and the local time in a given time zone.
入力スキーマ
{
"type": "object",
"properties": {
"value": {
"type": "string",
"maxLength": 100
},
"timeZone": {
"type": "string",
"maxLength": 64,
"default": "UTC",
"description": "IANA time zone, e.g. Asia/Kolkata or America/New_York"
}
},
"required": [
"value"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_diff_json(left, right, arrays)
Compare two JSON documents structurally and list every added, removed and changed value with its JSONPath. Numbers compare exactly. Arrays match by content by default, so an inserted item shows as one addition; use arrays:"position" to compare index by index.
入力スキーマ
{
"type": "object",
"properties": {
"left": {
"type": "string",
"maxLength": 200000
},
"right": {
"type": "string",
"maxLength": 200000
},
"arrays": {
"type": "string",
"enum": [
"content",
"position"
],
"default": "content"
}
},
"required": [
"left",
"right"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_format_json(json, mode, indent, sortKeys, repair)
Validate, pretty-print or minify JSON, optionally sorting keys. Invalid JSON reports the exact line and column; with repair (default on) it fixes common problems such as trailing commas, single quotes, comments and unquoted keys, and lists each fix.
入力スキーマ
{
"type": "object",
"properties": {
"json": {
"type": "string",
"maxLength": 200000
},
"mode": {
"type": "string",
"enum": [
"format",
"minify"
],
"default": "format"
},
"indent": {
"type": "string",
"enum": [
"2",
"4",
"tab"
],
"default": "2"
},
"sortKeys": {
"type": "boolean",
"default": false
},
"repair": {
"type": "boolean",
"default": true
}
},
"required": [
"json"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_placeholder_image(width, height, text, background, color, ...)
Create a placeholder image URL (served by usesignal.dev) plus HTML, Markdown and CSS snippets, for mockups, prototypes, seed data and layouts. Width and height up to 4000 px.
入力スキーマ
{
"type": "object",
"properties": {
"width": {
"type": "integer",
"minimum": 1,
"maximum": 4000
},
"height": {
"type": "integer",
"minimum": 1,
"maximum": 4000
},
"text": {
"type": "string",
"maxLength": 120
},
"background": {
"type": "string",
"pattern": "^#[0-9a-fA-F]{6}$"
},
"color": {
"$ref": "#/properties/background"
},
"style": {
"type": "string",
"enum": [
"minimal",
"grid",
"gradient",
"dark",
"glass"
],
"default": "minimal"
},
"pattern": {
"type": "string",
"enum": [
"plain",
"grid",
"diagonal",
"dots",
"minimal"
]
},
"radius": {
"type": "integer",
"minimum": 0,
"maximum": 999
}
},
"required": [
"width",
"height"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_flowchart(mode, input, direction)
Turn JavaScript/TypeScript code, arrow steps or Mermaid-style arrows into a flowchart, returned as Mermaid source and an SVG diagram. Steps mode uses one flow per line: "Start -> Validate -> Save" and branches like "Validate -- No --> Show error".
入力スキーマ
{
"type": "object",
"properties": {
"mode": {
"type": "string",
"enum": [
"code",
"steps",
"mermaid"
]
},
"input": {
"type": "string",
"maxLength": 20000
},
"direction": {
"type": "string",
"enum": [
"vertical",
"horizontal"
],
"default": "vertical"
}
},
"required": [
"mode",
"input"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_open_workbench(tool, input)
Show the editable useSignal UI. First call a useSignal data tool, then pass its returned input and matching tool name. Recomputes from validated inputs; no shared state.
入力スキーマ
{
"type": "object",
"properties": {
"tool": {
"type": "string",
"enum": [
"usesignal_generate_form",
"usesignal_generate_colors",
"usesignal_test_regex",
"usesignal_generate_qr",
"usesignal_encode_decode",
"usesignal_explain_cron",
"usesignal_convert_timestamp",
"usesignal_diff_json",
"usesignal_format_json",
"usesignal_placeholder_image",
"usesignal_flowchart"
]
},
"input": {
"type": "object",
"additionalProperties": {}
}
},
"required": [
"tool",
"input"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}コミュニティ
エビデンス