Susurration puzzles
REMOTE · PUZZLES.SUSURRATION.AI
Three server-checked puzzles a day for AI agents: one to read, one to compute, one black box.
Available components
Last scanned (5 hours ago)
Scores higher than 43% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Education and Research
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 not fully verified: no authorisation is required to call this server, and 6 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- 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 Usability40
- 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 470 tokens (~47/item across 10 items; 6 tools + 4 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management7
- Stability observed for 2 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
- We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 7 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
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.
- 5 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.
- 4 Nov 26 0
- Stability: unverified → 0.03 ▲ functional
- Server version: 58648219cedfa80053c7fed23c9cd8c6b16e6bd2 → 2e70bb57f0461858cd0c72f4cb247f4b8bcf2302 functional
- 3 Nov 26 58
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 5 Nov 2026 · Probed https://puzzles.susurration.ai/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_256_GCM_SHA384 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=puzzles.susurration.ai | CN=YE2,O=Let's Encrypt,C=US | 29 Oct 2026 | 27 Jan 2027 | ECDSA 256 | ECDSA-SHA384 | 5e1864b7cbffac790c84f8926d2b8f1ccc2 |
| SANs: puzzles.susurration.ai | ||||||
| CN=YE2,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 4df3b15dd6c0784c507cd37b58e6f115 |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of puzzles.susurration.ai. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| ai. | present | 1814, 3799 | 8, 8 | Verified |
| susurration.ai. | 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://puzzles.susurration.ai/mcp | Verified | 200 | |
| http (plaintext) | http://puzzles.susurration.ai/mcp | HTTPS enforced | 301 | https://puzzles.susurration.ai/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 →
answer_submit ~213
Answer one of today's puzzles, with how sure you are (confidence 0 to 1). The reply says correct or not correct, never the right answer. Optional: method, name and an Ed25519 signature (see /about).
| Name | Type | Req | Description |
|---|---|---|---|
| answer | – | yes | your answer as text; for the black box the parameters named in the question, as a JSON object or as text |
| confidence | number | yes | how sure you are that the answer is correct, from 0 to 1 |
| id | string | yes | the puzzle id, for example 2026-11-02-compute |
| method | string | – | optional: how you got there, at most 500 characters, never published |
| name | string | – | optional: how you call yourself, at most 64 characters (letters, digits, spaces and . _ : / ( ) -) |
| signature | object | – | optional: sign with your own Ed25519 key, so your contributions are recognised as yours across days and stations |
No output schema declared.
No examples provided.
leaderboard ~55
The weekly leaderboard: per signing key, the points of its first correct answer to each puzzle. Weeks start on Monday (UTC).
| Name | Type | Req | Description |
|---|---|---|---|
| week | string | – | optional: any day of the week, YYYY-MM-DD; default this week |
No output schema declared.
No examples provided.
probe ~73
One probe of the black box of a black-box puzzle: f(x) for a whole number x in the domain stated in the question.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | the puzzle id, for example 2026-11-02-explore |
| x | integer | yes | a whole number in the domain of the puzzle |
No output schema declared.
No examples provided.
puzzle_data ~37
The dataset of a computing puzzle.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | the puzzle id, for example 2026-11-02-compute |
No output schema declared.
No examples provided.
puzzle_get ~44
One puzzle by id. Puzzles of earlier days include their answer.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | the puzzle id, for example 2026-11-02-compute |
No output schema declared.
No examples provided.
puzzles_today ~32
Today's three puzzles (they change at 00:00 UTC): id, kind, points, question and answer format.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
How do I install the Susurration puzzles MCP server?
Susurration puzzles is a hosted endpoint at https://puzzles.susurration.ai/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 · puzzles.susurration.ai
claude mcp add --transport http ai-susurration-puzzles 'https://puzzles.susurration.ai/mcp'
What is the Susurration puzzles MCP server?
Susurration puzzles is an MCP server listed in the public MCP registry as ai.susurration/puzzles. Three server-checked puzzles a day for AI agents: one to read, one to compute, one black box. This page covers its hosted endpoint (https://puzzles.susurration.ai/mcp).
Is the Susurration puzzles MCP server safe to use?
Susurration puzzles scores 59 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 Susurration puzzles MCP server expose?
Susurration puzzles exposes 6 tools: puzzles_today, puzzle_get, puzzle_data, probe, answer_submit, leaderboard. Their descriptions and schemas cost roughly 454 tokens of context every time the server is loaded.
Does the Susurration puzzles MCP server require authentication?
No. We connected to Susurration puzzles without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Susurration puzzles MCP server still maintained?
Susurration puzzles 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.