useSignal
REMOTE · WWW.USESIGNAL.DEV
QR codes, JSON diff/format, hashes, JWT, cron, timestamps, placeholders, flowcharts, forms, regex.
Available components
Last scanned (5 hours ago)
Scores higher than 76% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Developer Tools
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability47
- 0% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Fail
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 1150 tokens (~88/item across 13 items; 12 tools + 1 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage68
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 5% of tool parameters carry a description.Partial
Tool Safety75
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "usesignal_test_regex" implies "execute" and declares readOnlyHint instead, contradicting what its own name says it does. See how to fix → Fail
- An AI judge read all 13 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
- Supports UI / widget rendering.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 2 Nov 26 0
- Stability: 0.97 → pass security
- 1 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
- 29 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.
- 27 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.
- 25 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.
- 23 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.
- 21 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.
- 19 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://www.usesignal.dev/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=*.usesignal.dev | CN=YR2,O=Let's Encrypt,C=US | 13 Oct 2026 | 11 Jan 2027 | RSA 2048 | SHA256-RSA | 6fac5e88d6b7eba959ba9a058d27f471a7f |
| SANs: *.usesignal.dev, usesignal.dev | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of www.usesignal.dev. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dev. | present | 60074 | 8 | Verified |
| usesignal.dev. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
| x-content-type-options | nosniff |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://www.usesignal.dev/mcp | Verified | 200 | |
| http (plaintext) | http://www.usesignal.dev/mcp | HTTPS enforced | 308 | https://www.usesignal.dev/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
usesignal_convert_timestamp ~81
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.
| Name | Type | Req | Description |
|---|---|---|---|
| timeZone | string | – | IANA time zone, e.g. Asia/Kolkata or America/New_York |
| value | string | yes | – |
No output schema declared.
No examples provided.
usesignal_diff_json ~82
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.
| Name | Type | Req | Description |
|---|---|---|---|
| arrays | string | – | – |
| left | string | yes | – |
| right | string | yes | – |
No output schema declared.
No examples provided.
usesignal_encode_decode ~96
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.
| Name | Type | Req | Description |
|---|---|---|---|
| operation | string | yes | – |
| text | string | yes | – |
No output schema declared.
No examples provided.
usesignal_explain_cron ~90
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.
| Name | Type | Req | Description |
|---|---|---|---|
| count | integer | – | – |
| expression | string | yes | – |
| timeZone | string | – | IANA time zone, e.g. Asia/Kolkata or America/New_York |
No output schema declared.
No examples provided.
usesignal_flowchart ~85
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".
| Name | Type | Req | Description |
|---|---|---|---|
| direction | string | – | – |
| input | string | yes | – |
| mode | string | yes | – |
No output schema declared.
No examples provided.
usesignal_format_json ~97
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.
| Name | Type | Req | Description |
|---|---|---|---|
| indent | string | – | – |
| json | string | yes | – |
| mode | string | – | – |
| repair | boolean | – | – |
| sortKeys | boolean | – | – |
No output schema declared.
No examples provided.
usesignal_generate_colors ~76
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.
| Name | Type | Req | Description |
|---|---|---|---|
| baseColor | string | yes | – |
No output schema declared.
No examples provided.
usesignal_generate_form ~91
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.
| Name | Type | Req | Description |
|---|---|---|---|
| json | string | yes | – |
| overrides | array | – | – |
| title | string | – | – |
No output schema declared.
No examples provided.
usesignal_generate_qr ~191
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}.
| Name | Type | Req | Description |
|---|---|---|---|
| dark | string | – | – |
| errorCorrection | string | – | – |
| light | – | – | – |
| margin | integer | – | – |
| moduleStyle | string | – | – |
| type | string | yes | – |
| values | object | yes | – |
No output schema declared.
No examples provided.
usesignal_open_workbench Open useSignal workbench ~61
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.
| Name | Type | Req | Description |
|---|---|---|---|
| input | object | yes | – |
| tool | string | yes | – |
No output schema declared.
No examples provided.
usesignal_placeholder_image ~105
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.
| Name | Type | Req | Description |
|---|---|---|---|
| background | string | – | – |
| color | – | – | – |
| height | integer | yes | – |
| pattern | string | – | – |
| radius | integer | – | – |
| style | string | – | – |
| text | string | – | – |
| width | integer | yes | – |
No output schema declared.
No examples provided.
usesignal_test_regex ~88
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.
| Name | Type | Req | Description |
|---|---|---|---|
| flags | string | – | – |
| pattern | string | yes | – |
| tests | array | – | – |
| text | string | yes | – |
No output schema declared.
No examples provided.
How do I install the useSignal MCP server?
useSignal is a hosted endpoint at https://www.usesignal.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · www.usesignal.dev
claude mcp add --transport http sanket-naik-usesignal 'https://www.usesignal.dev/mcp'
What is the useSignal MCP server?
useSignal is an MCP server listed in the public MCP registry as io.github.sanket-naik/usesignal. QR codes, JSON diff/format, hashes, JWT, cron, timestamps, placeholders, flowcharts, forms, regex. This page covers its hosted endpoint (https://www.usesignal.dev/mcp).
Is the useSignal MCP server safe to use?
useSignal scores 78 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the useSignal MCP server expose?
useSignal exposes 12 tools: usesignal_generate_form, usesignal_generate_colors, usesignal_test_regex, usesignal_generate_qr, usesignal_encode_decode, and 7 more. Their descriptions and schemas cost roughly 1,143 tokens of context every time the server is loaded.
Does the useSignal MCP server require authentication?
No. We connected to useSignal without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the useSignal MCP server still maintained?
useSignal is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.