Plumbline - Contractor License Checks
REMOTE · CONTRACTORS.AGENTLOOKUPS.AI · SCANNED SEP 25
Free contractor-license checks from official state records; a no-match never proves unlicensed.
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 not fully verified: no authorisation is required to call this server, and 1 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 Usability66
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 389 tokens (~389/item across 1 items; 1 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- 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 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 1 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 2 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
How do I install the Plumbline - Contractor License Checks MCP server?
Plumbline - Contractor License Checks is a hosted endpoint at https://contractors.agentlookups.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 · contractors.agentlookups.ai
claude mcp add --transport http ai-agentlookups-plumbline 'https://contractors.agentlookups.ai/mcp'
{
"mcpServers": {
"ai-agentlookups-plumbline": {
"url": "https://contractors.agentlookups.ai/mcp"
}
}
} {
"servers": {
"ai-agentlookups-plumbline": {
"type": "http",
"url": "https://contractors.agentlookups.ai/mcp"
}
}
} [mcp_servers.ai-agentlookups-plumbline] url = "https://contractors.agentlookups.ai/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"ai-agentlookups-plumbline": {
"type": "remote",
"url": "https://contractors.agentlookups.ai/mcp",
"enabled": true
}
}
} openclaw mcp add ai-agentlookups-plumbline --url 'https://contractors.agentlookups.ai/mcp' --transport streamable-http
mcp_servers:
ai-agentlookups-plumbline:
url: "https://contractors.agentlookups.ai/mcp" {
"McpServers": {
"ai-agentlookups-plumbline": {
"Transport": "http",
"Url": "https://contractors.agentlookups.ai/mcp"
}
}
} assistant mcp add ai-agentlookups-plumbline -t streamable-http -u 'https://contractors.agentlookups.ai/mcp'
{
"mcpServers": {
"ai-agentlookups-plumbline": {
"type": "http",
"url": "https://contractors.agentlookups.ai/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.
- 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
- 4 Sept 26 0
- Stability: 0.97 → pass security
- 3 Sept 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.
- 1 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.
- 30 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes.
- 28 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.
- 26 Aug 26 0
- First check of Injection markers: pass security
- First check of Judged manipulation: pass security
- First check of Destructive annotations: pass functional
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 11 Aug 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
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 25 Sept 2026 · Probed https://contractors.agentlookups.ai/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=contractors.agentlookups.ai | CN=YR1,O=Let's Encrypt,C=US | 11 Aug 2026 | 9 Nov 2026 | RSA 2048 | SHA256-RSA | 5768be95a875b6dec742ad184d4d08a88b2 |
| SANs: contractors.agentlookups.ai | ||||||
| CN=YR1,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | a20253f15f2691c05dc1ce13b9bcca4e |
| 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 contractors.agentlookups.ai. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| ai. | present | 3799 | 8 | Verified |
| agentlookups.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://contractors.agentlookups.ai/mcp | Verified | 200 | |
| http (plaintext) | http://contractors.agentlookups.ai/mcp | HTTPS enforced | 301 | https://contractors.agentlookups.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 →
check_contractor ~296
Check a contractor's license against official state and local licensing records covering dozens of US jurisdictions. The covered set grows over time; GET /v1/coverage on this host for the exact current list, and never assume from this description whether a jurisdiction is covered. Provide a license number or a business name, plus the jurisdiction. Returns match (the license record with status and provenance), candidates (disambiguate and call again; page with offset), no_match_in_index (NOT a determination of unlicensure), or jurisdiction_not_covered (with an official pointer URL for that jurisdiction; the response message states exactly what the link is, which for some jurisdictions is a consumer-protection or licensing-board page rather than a license lookup, so relay the message's wording and never present the link as a license lookup unless the message says it is one).
| Name | Type | Req | Description |
|---|---|---|---|
| jurisdiction | string | – | State or local jurisdiction code, e.g. "CA" ("US-CA" style also accepted) or "NYC". Coverage spans dozens of US jurisdictions; GET /v1/coverage for the exact current list. |
| license | string | – | License number, e.g. "1000002" |
| name | string | – | Business name, e.g. "Bayside Plumbing" |
| offset | integer | – | Pagination offset into the candidates list, default 0. Use with total_candidates from a prior call to page through large candidate sets. |
No output schema declared.
No examples provided.
What is the Plumbline - Contractor License Checks MCP server?
Plumbline - Contractor License Checks is an MCP server listed in the public MCP registry as ai.agentlookups/plumbline. Free contractor-license checks from official state records; a no-match never proves unlicensed. This page covers its hosted endpoint (https://contractors.agentlookups.ai/mcp).
Is the Plumbline - Contractor License Checks MCP server safe to use?
Plumbline - Contractor License Checks scores 75 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 Plumbline - Contractor License Checks MCP server expose?
Plumbline - Contractor License Checks exposes 1 tool: check_contractor. Their descriptions and schemas cost roughly 296 tokens of context every time the server is loaded.
Does the Plumbline - Contractor License Checks MCP server require authentication?
No. We connected to Plumbline - Contractor License Checks without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Plumbline - Contractor License Checks MCP server still maintained?
Plumbline - Contractor License Checks is still listed as active in the MCP registry. We last reached this channel on 25 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.