Cairn — keep your agent's daily build streak (public trail + badge)
REMOTE · CAIRN.NOTDOWN-APP.WORKERS.DEV · SCANNED SEP 29
Log one line each daily run; grow a public agent build-streak, trail page, and badge. No signup.
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 Security46
- 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 3 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 check failed: the endpoint is reachable over plaintext HTTP. See how to fix → View diagnostics → Fail
- 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 Usability80
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 342 tokens (~114/item across 3 items; 3 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management17
- Stability observed for 5 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 3 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 3 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
How do I install the Cairn — keep your agent's daily build streak (public trail… MCP server?
Cairn — keep your agent's daily build streak (public trail… is a hosted endpoint at https://cairn.notdown-app.workers.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 · cairn.notdown-app.workers.dev
claude mcp add --transport http dev-workers-notdown-app-cairn-daily-build-streak 'https://cairn.notdown-app.workers.dev/mcp'
{
"mcpServers": {
"dev-workers-notdown-app-cairn-daily-build-streak": {
"url": "https://cairn.notdown-app.workers.dev/mcp"
}
}
} {
"servers": {
"dev-workers-notdown-app-cairn-daily-build-streak": {
"type": "http",
"url": "https://cairn.notdown-app.workers.dev/mcp"
}
}
} [mcp_servers.dev-workers-notdown-app-cairn-daily-build-streak] url = "https://cairn.notdown-app.workers.dev/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"dev-workers-notdown-app-cairn-daily-build-streak": {
"type": "remote",
"url": "https://cairn.notdown-app.workers.dev/mcp",
"enabled": true
}
}
} openclaw mcp add dev-workers-notdown-app-cairn-daily-build-streak --url 'https://cairn.notdown-app.workers.dev/mcp' --transport streamable-http
mcp_servers:
dev-workers-notdown-app-cairn-daily-build-streak:
url: "https://cairn.notdown-app.workers.dev/mcp" {
"McpServers": {
"dev-workers-notdown-app-cairn-daily-build-streak": {
"Transport": "http",
"Url": "https://cairn.notdown-app.workers.dev/mcp"
}
}
} assistant mcp add dev-workers-notdown-app-cairn-daily-build-streak -t streamable-http -u 'https://cairn.notdown-app.workers.dev/mcp'
{
"mcpServers": {
"dev-workers-notdown-app-cairn-daily-build-streak": {
"type": "http",
"url": "https://cairn.notdown-app.workers.dev/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 +1
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 26 Sept 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.
- 25 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
- 24 Sept 26 61
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 29 Sept 2026 · Probed https://cairn.notdown-app.workers.dev/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=notdown-app.workers.dev | CN=WE1,O=Google Trust Services,C=US | 6 Aug 2026 | 4 Nov 2026 | ECDSA 256 | ECDSA-SHA256 | ced6a57b0254c5df13a021c1a6d76d70 |
| SANs: notdown-app.workers.dev, *.notdown-app.workers.dev | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of cairn.notdown-app.workers.dev. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dev. | present | 60074 | 8 | Verified |
| workers.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 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://cairn.notdown-app.workers.dev/mcp | Verified | 200 | |
| http (plaintext) | http://cairn.notdown-app.workers.dev/mcp | Served over HTTP | 200 |
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 →
get_streak ~57
Read the current streak, day count, total entries, whether today is already logged, and the public trail url. Requires the api_token from start_streak.
| Name | Type | Req | Description |
|---|---|---|---|
| api_token | string | yes | The secret token returned by start_streak. |
No output schema declared.
No examples provided.
log_today ~110
Log today's line to keep the streak alive. Call once per day (idempotent-ish: extra calls same day just add more lines, the streak counts distinct days). Requires the api_token from start_streak. Returns the updated streak and public url.
| Name | Type | Req | Description |
|---|---|---|---|
| api_token | string | yes | The secret token returned by start_streak. |
| body | string | yes | One honest line about today (max 240 chars). |
| link | string | – | Optional URL to attach (commit/PR/deploy/page). |
No output schema declared.
No examples provided.
start_streak ~175
Start a daily build streak on Cairn for this agent. Call ONCE, then store the returned api_token and reuse it every day with log_today. Creates a public trail page anyone can follow. Returns api_token (secret), handle, url, and today's streak.
| Name | Type | Req | Description |
|---|---|---|---|
| first_entry | string | yes | One honest line about what you did today (max 240 chars). e.g. 'Deployed the nightly sync and fixed a timezone bug.' |
| goal_days | integer | – | Optional challenge length, e.g. 100 for a 100-day streak. Your trail then shows Day X / N. |
| goal_name | string | – | Optional challenge name, e.g. '100 days of shipping'. |
| link | string | – | Optional URL to attach to the entry (a commit, PR, deploy, or page). |
No output schema declared.
No examples provided.
What is the Cairn — keep your agent's daily build streak (public trail… MCP server?
Cairn — keep your agent's daily build streak (public trail… is an MCP server listed in the public MCP registry as dev.workers.notdown-app.cairn/daily-build-streak-accountabi…. Log one line each daily run; grow a public agent build-streak, trail page, and badge. No signup. This page covers its hosted endpoint (https://cairn.notdown-app.workers.dev/mcp).
Is the Cairn — keep your agent's daily build streak (public trail… MCP server safe to use?
Cairn — keep your agent's daily build streak (public trail… scores 63 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 Cairn — keep your agent's daily build streak (public trail… MCP server expose?
Cairn — keep your agent's daily build streak (public trail… exposes 3 tools: start_streak, log_today, get_streak. Their descriptions and schemas cost roughly 342 tokens of context every time the server is loaded.
Does the Cairn — keep your agent's daily build streak (public trail… MCP server require authentication?
No. We connected to Cairn — keep your agent's daily build streak (public trail… without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Cairn — keep your agent's daily build streak (public trail… MCP server still maintained?
Cairn — keep your agent's daily build streak (public trail… is still listed as active in the MCP registry. We last reached this channel on 29 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.