useSignal
QR codes, JSON diff/format, hashes, JWT, cron, timestamps, placeholders, flowcharts, forms, regex.
我该使用它吗
质量与安全性
发现（3）
- HIGHTool poisoning patterns detected
- MEDIUMTool 'usesignal_placeholder_image' description contains placeholder text在 usesignal_placeholder_image 中
- INFOTool description contains placeholder or incomplete text在 usesignal_placeholder_image 中
基于对工具定义和协议合规性的自动分析。
上下文开销
这是每次将服务器的工具加载到模型上下文窗口时所消耗的大致 token 数。数值越高，可用于其他任务的注意力就越少。
安装
一键安装
将以下内容添加到你的 `claude_desktop_config.json` 文件中：
{
"mcpServers": {
"usesignal": {
"url": "https://www.usesignal.dev/mcp"
}
}
}远程端点
https://www.usesignal.dev/mcpstreamable-http它能做什么
工具清单
工具（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.
输入模式
{
"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,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_generate_colors(baseColor)
Generate light and dark semantic color tokens from a six-digit hex brand color. Returns a shade scale, measured text contrast checks and CSS, JSON and Tailwind exports. This measures listed color pairs only, not whole-page accessibility. Call usesignal_open_workbench with the result input to preview.
输入模式
{
"type": "object",
"properties": {
"baseColor": {
"type": "string",
"pattern": "^#[0-9a-fA-F]{6}$"
}
},
"required": [
"baseColor"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_test_regex(pattern, flags, text, tests)
Execute a JavaScript regular expression against text and expected match/non-match test cases. Returns indexed matches and capture groups. Flags use JavaScript semantics. Execution times out after 500ms. Call usesignal_open_workbench with result input to highlight matches.
输入模式
{
"type": "object",
"properties": {
"pattern": {
"type": "string",
"maxLength": 1000
},
"flags": {
"type": "string",
"maxLength": 8,
"default": "g"
},
"text": {
"type": "string",
"maxLength": 20000
},
"tests": {
"type": "array",
"items": {
"type": "object",
"properties": {
"text": {
"type": "string",
"maxLength": 2000
},
"shouldMatch": {
"type": "boolean"
}
},
"required": [
"text",
"shouldMatch"
],
"additionalProperties": false
},
"maxItems": 50,
"default": []
}
},
"required": [
"pattern",
"text"
],
"additionalProperties": false,
"$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}.
输入模式
{
"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,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_encode_decode(operation, text)
Exact text transforms: Base64 encode/decode (UTF-8), URL encode/decode, decode a JWT header and payload with readable exp/iat/nbf dates (the signature is not verified), or hash text with MD5, SHA-1, SHA-256 and SHA-512. Use this instead of computing hashes or Base64 by hand.
输入模式
{
"type": "object",
"properties": {
"operation": {
"type": "string",
"enum": [
"base64_encode",
"base64_decode",
"url_encode",
"url_decode",
"jwt_decode",
"hash"
]
},
"text": {
"type": "string",
"maxLength": 100000
}
},
"required": [
"operation",
"text"
],
"additionalProperties": false,
"$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.
输入模式
{
"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,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_convert_timestamp(value, timeZone)
Convert a Unix timestamp (seconds or milliseconds) or an ISO 8601 date into ISO, UTC, epoch seconds/milliseconds, a relative time and the local time in a given time zone.
输入模式
{
"type": "object",
"properties": {
"value": {
"type": "string",
"maxLength": 100
},
"timeZone": {
"type": "string",
"maxLength": 64,
"default": "UTC",
"description": "IANA time zone, e.g. Asia/Kolkata or America/New_York"
}
},
"required": [
"value"
],
"additionalProperties": false,
"$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.
输入模式
{
"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,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_format_json(json, mode, indent, sortKeys, repair)
Validate, pretty-print or minify JSON, optionally sorting keys. Invalid JSON reports the exact line and column; with repair (default on) it fixes common problems such as trailing commas, single quotes, comments and unquoted keys, and lists each fix.
输入模式
{
"type": "object",
"properties": {
"json": {
"type": "string",
"maxLength": 200000
},
"mode": {
"type": "string",
"enum": [
"format",
"minify"
],
"default": "format"
},
"indent": {
"type": "string",
"enum": [
"2",
"4",
"tab"
],
"default": "2"
},
"sortKeys": {
"type": "boolean",
"default": false
},
"repair": {
"type": "boolean",
"default": true
}
},
"required": [
"json"
],
"additionalProperties": false,
"$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.
输入模式
{
"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,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢usesignal_flowchart(mode, input, direction)
Turn JavaScript/TypeScript code, arrow steps or Mermaid-style arrows into a flowchart, returned as Mermaid source and an SVG diagram. Steps mode uses one flow per line: "Start -> Validate -> Save" and branches like "Validate -- No --> Show error".
输入模式
{
"type": "object",
"properties": {
"mode": {
"type": "string",
"enum": [
"code",
"steps",
"mermaid"
]
},
"input": {
"type": "string",
"maxLength": 20000
},
"direction": {
"type": "string",
"enum": [
"vertical",
"horizontal"
],
"default": "vertical"
}
},
"required": [
"mode",
"input"
],
"additionalProperties": false,
"$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.
输入模式
{
"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#"
}社区
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