MCP Server
useSignal
io.github.sanket-naik/usesignal
What this MCP does
Provides developer utilities for JSON, encoding, hashing, JWT inspection, cron expressions, regex testing, QR codes, flowcharts, forms, colors, and placeholder assets.
Capabilities
Tools
12
tools
usesignal_convert_timestamp
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.
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['value'], 'properties': {'value': {'type': 'string', 'maxLength': 100}, 'timeZone': {'type': 'string', 'default': 'UTC', 'maxLength': 64, 'description': 'IANA time zone, e.g. Asia/Kolkata or America/New_York'}}, 'additionalProperties': False}
usesignal_diff_json
Compare two JSON documents structurally and list every added, removed and changed value with its JSONPath. Numbers compare exactly. Arrays match by content by default, so an inserted item shows as one addition; use arrays:"position" to compare index by index.
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['left', 'right'], 'properties': {'left': {'type': 'string', 'maxLength': 200000}, 'right': {'type': 'string', 'maxLength': 200000}, 'arrays': {'enum': ['content', 'position'], 'type': 'string', 'default': 'content'}}, 'additionalProperties': False}
usesignal_encode_decode
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.
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['operation', 'text'], 'properties': {'text': {'type': 'string', 'maxLength': 100000}, 'operation': {'enum': ['base64_encode', 'base64_decode', 'url_encode', 'url_decode', 'jwt_decode', 'hash'], 'type': 'string'}}, 'additionalProperties': False}
usesignal_explain_cron
Explain a standard 5-field cron expression (minute hour day-of-month month day-of-week) in plain English and list its next run times in a given time zone, handling daylight saving time.
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['expression'], 'properties': {'count': {'type': 'integer', 'default': 5, 'maximum': 20, 'minimum': 1}, 'timeZone': {'type': 'string', 'default': 'UTC', 'maxLength': 64, 'description': 'IANA time zone, e.g. Asia/Kolkata or America/New_York'}, 'expression': {'type': 'string', 'maxLength': 200}}, 'additionalProperties': False}
usesignal_flowchart
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".
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['mode', 'input'], 'properties': {'mode': {'enum': ['code', 'steps', 'mermaid'], 'type': 'string'}, 'input': {'type': 'string', 'maxLength': 20000}, 'direction': {'enum': ['vertical', 'horizontal'], 'type': 'string', 'default': 'vertical'}}, 'additionalProperties': False}
usesignal_format_json
Validate, pretty-print or minify JSON, optionally sorting keys. Invalid JSON reports the exact line and column; with repair (default on) it fixes common problems such as trailing commas, single quotes, comments and unquoted keys, and lists each fix.
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['json'], 'properties': {'json': {'type': 'string', 'maxLength': 200000}, 'mode': {'enum': ['format', 'minify'], 'type': 'string', 'default': 'format'}, 'indent': {'enum': ['2', '4', 'tab'], 'type': 'string', 'default': '2'}, 'repair': {'type': 'boolean', 'default': True}, 'sortKeys': {'type': 'boolean', 'default': False}}, 'additionalProperties': False}
usesignal_generate_colors
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.
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['baseColor'], 'properties': {'baseColor': {'type': 'string', 'pattern': '^#[0-9a-fA-F]{6}$'}}, 'additionalProperties': False}
usesignal_generate_form
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.
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['json'], 'properties': {'json': {'type': 'string', 'maxLength': 50000}, 'title': {'type': 'string', 'default': 'Generated form', 'maxLength': 120}, 'overrides': {'type': 'array', 'items': {'type': 'object', 'required': ['path'], 'properties': {'path': {'type': 'array', 'items': {'type': 'string'}, 'maxItems': 9}, 'type': {'enum': ['text', 'email', 'number', 'checkbox', 'textarea'], 'type': 'string'}, 'label': {'type': 'string', 'maxLength': 120}, 'required': {'type': 'boolean'}}, 'additionalProperties': False}, 'default': [], 'maxItems': 100}}, 'additionalProperties': False}
usesignal_generate_qr
Generate a scannable QR code for a link, text, Wi-Fi network, contact card (vCard), email, SMS, phone number, WhatsApp chat or UPI payment. Returns the encoded payload, an SVG file and a PNG preview image. values by type: url{url}; text{text}; wifi{ssid,password,security:WPA|WEP|nopass,hidden}; vcard{firstName,lastName,phone,email,org,title,website,address}; email{to,subject,body}; sms{phone,message}; phone{phone}; whatsapp{phone,message}; upi{vpa,name,amount,note}.
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['type', 'values'], 'properties': {'dark': {'type': 'string', 'default': '#111111', 'pattern': '^#[0-9a-fA-F]{6}$'}, 'type': {'enum': ['url', 'text', 'wifi', 'upi', 'vcard', 'whatsapp', 'email', 'sms', 'phone'], 'type': 'string'}, 'light': {'$ref': '#/properties/dark', 'default': '#FFFFFF'}, 'margin': {'type': 'integer', 'default': 4, 'maximum': 16, 'minimum': 0}, 'values': {'type': 'object', 'additionalProperties': {'anyOf': [{'type': 'string', 'maxLength': 2000}, {'type': 'boolean'}, {'type': 'number'}]}}, 'moduleStyle': {'enum': ['square', 'rounded', 'dots'], 'type': 'string', 'default': 'square'}, 'errorCorrection': {'enum': ['L', 'M', 'Q', 'H'], 'type': 'string', 'default': 'M'}}, 'additionalProperties': False}
usesignal_open_workbench
Open useSignal workbench
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.
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['tool', 'input'], 'properties': {'tool': {'enum': ['usesignal_generate_form', 'usesignal_generate_colors', 'usesignal_test_regex', 'usesignal_generate_qr', 'usesignal_encode_decode', 'usesignal_explain_cron', 'usesignal_convert_timestamp', 'usesignal_diff_json', 'usesignal_format_json', 'usesignal_placeholder_image', 'usesignal_flowchart'], 'type': 'string'}, 'input': {'type': 'object', 'additionalProperties': {}}}, 'additionalProperties': False}
usesignal_placeholder_image
Create a placeholder image URL (served by usesignal.dev) plus HTML, Markdown and CSS snippets, for mockups, prototypes, seed data and layouts. Width and height up to 4000 px.
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['width', 'height'], 'properties': {'text': {'type': 'string', 'maxLength': 120}, 'color': {'$ref': '#/properties/background'}, 'style': {'enum': ['minimal', 'grid', 'gradient', 'dark', 'glass'], 'type': 'string', 'default': 'minimal'}, 'width': {'type': 'integer', 'maximum': 4000, 'minimum': 1}, 'height': {'type': 'integer', 'maximum': 4000, 'minimum': 1}, 'radius': {'type': 'integer', 'maximum': 999, 'minimum': 0}, 'pattern': {'enum': ['plain', 'grid', 'diagonal', 'dots', 'minimal'], 'type': 'string'}, 'background': {'type': 'string', 'pattern': '^#[0-9a-fA-F]{6}$'}}, 'additionalProperties': False}
usesignal_test_regex
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.
Read only
Idempotent
Input schema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['pattern', 'text'], 'properties': {'text': {'type': 'string', 'maxLength': 20000}, 'flags': {'type': 'string', 'default': 'g', 'maxLength': 8}, 'tests': {'type': 'array', 'items': {'type': 'object', 'required': ['text', 'shouldMatch'], 'properties': {'text': {'type': 'string', 'maxLength': 2000}, 'shouldMatch': {'type': 'boolean'}}, 'additionalProperties': False}, 'default': [], 'maxItems': 50}, 'pattern': {'type': 'string', 'maxLength': 1000}}, 'additionalProperties': False}
History
Recent tool changes
Added
usesignal_open_workbench
Oct. 4, 2026, 2:40 a.m.
Added
usesignal_flowchart
Oct. 4, 2026, 2:40 a.m.
Added
usesignal_placeholder_image
Oct. 4, 2026, 2:40 a.m.
Added
usesignal_format_json
Oct. 4, 2026, 2:40 a.m.
Added
usesignal_diff_json
Oct. 4, 2026, 2:40 a.m.
Added
usesignal_convert_timestamp
Oct. 4, 2026, 2:40 a.m.
Added
usesignal_explain_cron
Oct. 4, 2026, 2:40 a.m.
Added
usesignal_encode_decode
Oct. 4, 2026, 2:40 a.m.
Added
usesignal_generate_qr
Oct. 4, 2026, 2:40 a.m.
Added
usesignal_test_regex
Oct. 4, 2026, 2:40 a.m.
Added
usesignal_generate_colors
Oct. 4, 2026, 2:40 a.m.
Added
usesignal_generate_form
Oct. 4, 2026, 2:40 a.m.
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