useSignal MCP server

• usesignal_convert_timestampFree

  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.

• usesignal_diff_jsonFree

  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.

• usesignal_encode_decodeFree

  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.

• usesignal_explain_cronFree

  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.

• usesignal_flowchartFree

  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".

• usesignal_format_jsonFree

  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.

• usesignal_generate_colorsFree

  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.

• usesignal_generate_formFree

  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.

• usesignal_generate_qrFree

  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}.

• usesignal_open_workbenchFree

  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.

• usesignal_placeholder_imagewrite actionFree

  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.

• usesignal_test_regexwrite actionFree

  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.

• –Code scanremote-only server, no package to scann/a
• Live reliabilityremote reachable in 502ms20/20
• Tool poisoning12 tool descriptions checked15/15
• Auth qualityopen endpoint exposes 2 write-action tools with no auth3/15
• Maintenancelast push 0 days ago15/15
• Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Safety score

81/100

higher than 62% of 48,255 servers

Tools

12

the typical server has 7

Tools that change things

17%

typical: 0%. Fewer write tools means less an agent can break

Uptime

100%

of our recent checks; the typical remote server answers 100%

Response time

172 ms

faster than 69% of 30,031 servers

useSignal: common questions

Is useSignal MCP server safe?

Mostly: it is graded B (81/100). Read the useSignal safety report

How do I install useSignal?

It runs remotely at www.usesignal.dev. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.

Does useSignal need an API key?

Not as far as the registry entry and our scan can tell: no credentials are declared or required.

Is useSignal maintained?

The last commit was 32 days ago (2026-10-03). The latest release is v0.2.0.

Is useSignal up?

100% of our last 28 checks got an answer. We check remote servers about four times a day.

What can I use instead of useSignal?

Servers from other publishers that do the same job: kordoc MCP server.

How does useSignal compare with other MCP servers?

safety score 81/100 (higher than 62% of 48,255 servers); tools 12 (the typical server has 7); tools that change things 17% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.