PlainRouter
REMOTE · PLAINROUTER.COM · 2 COMPONENTS · SCANNED SEP 20
Inspect an approved ad account and first-party signal health, then propose policy-gated actions.
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 Security63
- 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 4 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
- 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 Usability84
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 534 tokens (~106/item across 5 items; 4 tools + 1 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management80
- Stability observed for 24 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 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 6 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
- Supports UI / widget rendering.Pass
How do I install the PlainRouter MCP server?
PlainRouter is a hosted endpoint at https://plainrouter.com/mcp/sandbox, 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 · plainrouter.com
claude mcp add --transport http com-plainrouter-mcp 'https://plainrouter.com/mcp/sandbox'
{
"mcpServers": {
"com-plainrouter-mcp": {
"url": "https://plainrouter.com/mcp/sandbox"
}
}
} {
"servers": {
"com-plainrouter-mcp": {
"type": "http",
"url": "https://plainrouter.com/mcp/sandbox"
}
}
} [mcp_servers.com-plainrouter-mcp] url = "https://plainrouter.com/mcp/sandbox"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-plainrouter-mcp": {
"type": "remote",
"url": "https://plainrouter.com/mcp/sandbox",
"enabled": true
}
}
} openclaw mcp add com-plainrouter-mcp --url 'https://plainrouter.com/mcp/sandbox' --transport streamable-http
mcp_servers:
com-plainrouter-mcp:
url: "https://plainrouter.com/mcp/sandbox" {
"McpServers": {
"com-plainrouter-mcp": {
"Transport": "http",
"Url": "https://plainrouter.com/mcp/sandbox"
}
}
} assistant mcp add com-plainrouter-mcp -t streamable-http -u 'https://plainrouter.com/mcp/sandbox'
{
"mcpServers": {
"com-plainrouter-mcp": {
"type": "http",
"url": "https://plainrouter.com/mcp/sandbox"
}
}
} 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.
- 20 Sept 26 +1
- Schema quality: 93 → 106 ▼ functional
- “get_performance” added an optional parameter “account_id” cosmetic
- “get_account_state” added an optional parameter “account_id” cosmetic
- “get_signal_health” added an optional parameter “account_id” cosmetic
- 18 Sept 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.
- 17 Sept 26 0
- MCP protocol: Implements a current MCP spec version (2026-07-28). functional
- MCP protocol version: 2025-11-25 → 2026-07-28 functional
- Server version: 0.3.2 → 0.4.0 functional
- 16 Sept 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.
- 14 Sept 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.
- 12 Sept 26 +1
- The server rewrote its instructions, which are the text every model session reads security
- The server changed its declared name: PlainRouter Sandbox → Plainrouter Sandbox security
- Tool “validate_sandbox_event” rewrote its description, which is the text the model reads security
- 11 Sept 26 0
- “get_signal_health” added an optional parameter “days” cosmetic
1 cosmetic change on this day. Switch on “Show cosmetic changes” to see it.
- 10 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 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 20 Sept 2026 · Probed https://plainrouter.com/mcp/sandbox
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=plainrouter.com | CN=WE1,O=Google Trust Services,C=US | 7 Aug 2026 | 5 Nov 2026 | ECDSA 256 | ECDSA-SHA256 | 4c0da8387d1b076c0e3177aac71f9ca4 |
| SANs: plainrouter.com, *.plainrouter.com | ||||||
| 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 plainrouter.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| plainrouter.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 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000; includeSubDomains |
| x-content-type-options | nosniff |
| x-frame-options | SAMEORIGIN |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://plainrouter.com/mcp/sandbox | Verified | 200 | |
| http (plaintext) | http://plainrouter.com/mcp/sandbox | HTTPS enforced | 301 | https://plainrouter.com/mcp/sandbox |
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_account_state Sandbox Account State ~66
Synthetic twin of the production tool. Returns an invented advertising account in the real response shape, marked "sandbox": true. Requires no account, API key, or OAuth flow.
| Name | Type | Req | Description |
|---|---|---|---|
| account_id | integer | – | Advertising account ID. Required when the workspace has more than one active account. |
No output schema declared.
No examples provided.
get_performance Sandbox Performance ~85
Synthetic twin of the production tool. Returns invented reconciliation evidence in the real response shape, marked "sandbox": true. Requires no account, API key, or OAuth flow.
| Name | Type | Req | Description |
|---|---|---|---|
| account_id | integer | – | Advertising account ID. Required when the workspace has more than one active account. |
| days | integer | – | Number of reporting days to compare, from 1 to 90. |
No output schema declared.
No examples provided.
get_signal_health Sandbox Signal Health ~88
Synthetic twin of the production tool. Returns invented Signal health in the real response shape, marked "sandbox": true. Requires no account, API key, or OAuth flow.
| Name | Type | Req | Description |
|---|---|---|---|
| account_id | integer | – | Advertising account ID. Required when the workspace has more than one active account. |
| days | integer | – | Trailing window in days. One of 7, 30, 90. |
No output schema declared.
No examples provided.
validate_sandbox_event Validate Sandbox Event ~150
Validate a synthetic, identity-free conversion event against the Plainrouter schema. Requires no account, API key, or OAuth flow. Nothing is stored and nothing is sent to an advertising provider. Use this to confirm the server is reachable and that an event payload is well formed before requesting credentials.
| Name | Type | Req | Description |
|---|---|---|---|
| action_source | string | – | Where the synthetic event originated: website, app, or other. |
| event_id | string | – | Optional synthetic idempotency key. Maximum 128 characters. One is derived when omitted. |
| event_name | string | yes | Synthetic event name, such as Purchase. Maximum 100 characters. |
| value_data | object | – | Optional synthetic commerce data. Identity-bearing fields are rejected. |
No output schema declared.
No examples provided.
What is the PlainRouter MCP server?
PlainRouter is an MCP server listed in the public MCP registry as com.plainrouter/mcp. Inspect an approved ad account and first-party signal health, then propose policy-gated actions. This page covers its hosted endpoint (https://plainrouter.com/mcp/sandbox).
Is the PlainRouter MCP server safe to use?
PlainRouter scores 80 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 PlainRouter MCP server expose?
PlainRouter exposes 4 tools: get_account_state, get_signal_health, get_performance, validate_sandbox_event. Their descriptions and schemas cost roughly 389 tokens of context every time the server is loaded.
Does the PlainRouter MCP server require authentication?
No. We connected to PlainRouter without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the PlainRouter MCP server still maintained?
PlainRouter is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.