OnceAsk
REMOTE · ONCEASK.COM · SCANNED SEP 28
MCP server for OnceAsk, the AI-native current-address layer for people and agents.
Available components
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 Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation check failed: no authorisation is required to call this server, and it exposes a tool marked destructive (request_delivery_permission). See how to fix → View diagnostics → Fail
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- 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 Usability81
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 493 tokens (~123/item across 4 items; 4 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management40
- Stability observed for 12 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- All 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.Pass
- An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
How do I install the OnceAsk MCP server?
OnceAsk is a hosted endpoint at https://onceask.com/_api/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 · onceask.com
claude mcp add --transport http rsb6061-onceask 'https://onceask.com/_api/mcp'
{
"mcpServers": {
"rsb6061-onceask": {
"url": "https://onceask.com/_api/mcp"
}
}
} {
"servers": {
"rsb6061-onceask": {
"type": "http",
"url": "https://onceask.com/_api/mcp"
}
}
} [mcp_servers.rsb6061-onceask] url = "https://onceask.com/_api/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"rsb6061-onceask": {
"type": "remote",
"url": "https://onceask.com/_api/mcp",
"enabled": true
}
}
} openclaw mcp add rsb6061-onceask --url 'https://onceask.com/_api/mcp' --transport streamable-http
mcp_servers:
rsb6061-onceask:
url: "https://onceask.com/_api/mcp" {
"McpServers": {
"rsb6061-onceask": {
"Transport": "http",
"Url": "https://onceask.com/_api/mcp"
}
}
} assistant mcp add rsb6061-onceask -t streamable-http -u 'https://onceask.com/_api/mcp'
{
"mcpServers": {
"rsb6061-onceask": {
"type": "http",
"url": "https://onceask.com/_api/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
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.
- 28 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 27 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.
- 25 Sept 26 +1
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 23 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.
- 21 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.
- 19 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.
- 17 Sept 26 +1
- Stability: unverified → 0.03 ▲ functional
- 16 Sept 26 65
First indexed and scored.
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 28 Sept 2026 · Probed https://onceask.com/_api/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=onceask.com | CN=Amazon RSA 2048 M04,O=Amazon,C=US | 7 Sept 2026 | 23 Mar 2027 | RSA 2048 | SHA256-RSA | a4c13df97193593e9cf64902c8c2464 |
| SANs: onceask.com, *.onceask.com | ||||||
| CN=Amazon RSA 2048 M04,O=Amazon,C=US (CA) | CN=Amazon Root CA 1,O=Amazon,C=US | 23 Aug 2022 | 23 Aug 2030 | RSA 2048 | SHA256-RSA | 773124f2a952e3ed18a58bdb85d1bc0ce5f27 |
| CN=Amazon Root CA 1,O=Amazon,C=US (CA) | CN=Starfield Services Root Certificate Authority - G2,O=Starfield Technologies\, Inc.,L=Scottsdale,ST=Arizona,C=US | 25 May 2015 | 31 Dec 2037 | RSA 2048 | SHA256-RSA | 67f944a2a27cdf3fac2ae2b01f908eeb9c4c6 |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of onceask.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| onceask.com. | 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 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://onceask.com/_api/mcp | Verified | 200 | |
| http (plaintext) | http://onceask.com/_api/mcp | HTTPS enforced | 301 | https://onceask.com/_api/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 →
list_handwritten_cards Browse handwritten cards ~34
List available Handwrytten card designs and handwriting styles for privacy-preserving fulfillment. Does not expose recipient address data.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
request_delivery_permission Request private delivery permission ~131
After the user explicitly confirms they want the recipient contacted, ask OnceAsk to request a current delivery address/permission. Accepts either a recipientId from resolve_delivery or a person's name/email. OnceAsk searches its contacts and connected Google/Gmail-derived people, then emails the secure request when possible without revealing the recipient email or street address to the agent.
| Name | Type | Req | Description |
|---|---|---|---|
| contactId | string | – | recipientId returned by resolve_delivery |
| customMessage | string | – | Optional message shown to the recipient |
| query | string | – | Person's name or email when recipientId is not known, e.g. Aunt Theresa |
No output schema declared.
No examples provided.
resolve_delivery Resolve private delivery ~110
Preferred privacy-preserving way to send something to a person. Searches OnceAsk first and, when connected, can discover a missing person from Google Contacts or Gmail interactions. Resolves to a short-lived one-time delivery token when recipient permission and a current address exist. Does not return the street address.
| Name | Type | Req | Description |
|---|---|---|---|
| contactId | string | – | Known OnceAsk contact ID |
| purpose | string | – | Purpose for the physical delivery |
| query | string | – | Name or email to resolve when contact ID is not known |
No output schema declared.
No examples provided.
send_handwritten_card Send handwritten card ~115
Fulfill a handwritten card using a delivery token returned by resolve_delivery. OnceAsk sends the recipient address directly to the fulfillment provider; the agent does not receive it.
| Name | Type | Req | Description |
|---|---|---|---|
| cardId | number | yes | Card ID from list_handwritten_cards |
| deliveryToken | string | yes | Opaque token returned by resolve_delivery |
| fontLabel | string | – | Handwriting label from list_handwritten_cards; defaults to Casual David |
| message | string | yes | Handwritten message |
| wishes | string | – | Optional closing/signoff |
No output schema declared.
No examples provided.
What is the OnceAsk MCP server?
OnceAsk is an MCP server listed in the public MCP registry as io.github.rsb6061/onceask. MCP server for OnceAsk, the AI-native current-address layer for people and agents. This page covers its hosted endpoint (https://onceask.com/_api/mcp).
Is the OnceAsk MCP server safe to use?
OnceAsk scores 71 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 OnceAsk MCP server expose?
OnceAsk exposes 4 tools: resolve_delivery, request_delivery_permission, list_handwritten_cards, send_handwritten_card. Their descriptions and schemas cost roughly 390 tokens of context every time the server is loaded.
Does the OnceAsk MCP server require authentication?
No. We connected to OnceAsk without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the OnceAsk MCP server still maintained?
OnceAsk is still listed as active in the MCP registry. We last reached this channel on 28 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.