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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "us-sales-tax-nexus": {
      "type": "http",
      "url": "https://us-sales-tax-nexus.nerolabs.workers.dev/mcp"
    }
  }
}

claude mcp add --transport http us-sales-tax-nexus https://us-sales-tax-nexus.nerolabs.workers.dev/mcp

[mcp_servers.us-sales-tax-nexus]
url = "https://us-sales-tax-nexus.nerolabs.workers.dev/mcp"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "us-sales-tax-nexus": {
      "type": "remote",
      "url": "https://us-sales-tax-nexus.nerolabs.workers.dev/mcp",
      "enabled": true
    }
  }
}

{
  "mcpServers": {
    "us-sales-tax-nexus": {
      "type": "http",
      "url": "https://us-sales-tax-nexus.nerolabs.workers.dev/mcp"
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=us-sales-tax-nexus&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vdXMtc2FsZXMtdGF4LW5leHVzLm5lcm9sYWJzLndvcmtlcnMuZGV2L21jcCJ9"
}

{
  "servers": {
    "us-sales-tax-nexus": {
      "type": "http",
      "url": "https://us-sales-tax-nexus.nerolabs.workers.dev/mcp"
    }
  }
}

{
  "mcpServers": {
    "us-sales-tax-nexus": {
      "httpUrl": "https://us-sales-tax-nexus.nerolabs.workers.dev/mcp"
    }
  }
}

extensions:
  "us-sales-tax-nexus":
    enabled: true
    name: "us-sales-tax-nexus"
    type: streamable_http
    uri: "https://us-sales-tax-nexus.nerolabs.workers.dev/mcp"
    timeout: 300

Quality 79 / 100good

protocol75 · weight 25

warn
protocol.modernnewest supported version is 2025-06-18; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
n/a
protocol.statelessonly applies to 2026-07-28 servers
pass
protocol.transportstreamable HTTP
n/a
protocol.list_ttlonly applies to 2026-07-28 servers

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene71 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
fail
tools.annotationsno tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
fail
tools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: list_nexus_thresholds (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list_capabilities (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); check_economic_nexus (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
pass
tools.token_costabout 848 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability100 · weight 15

pass
stability.changesno tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name

dependenciesn/a · weight 15

n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

4 tools, about 848 tokens to load them all · tool set 1a30271fd8a5 · checked 2026-10-19 13:05 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 80 / 100

no-repository

provenance45

liveness100

freshness100

hygiene80

+website +reachable +uptime-100% +updated-9d-ago -no-repository

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://us-sales-tax-nexus.nerolabs.workers.dev/mcp` streamable-http	none	yes	100%	144 ms	2025-06-18	2026-10-19

Tools (4)

`check_economic_nexus`	Checks which US states a remote seller (no office, staff or stock in the state) must register in to collect sales tax, from its sales into each state. Give sales_by_state with the dollar sales and number of transactions (orders) per state, the period those figures cover, and whether they include sales made through marketplaces such as Amazon or Etsy. Returns states where the seller is over the economic nexus threshold (must register), states close to it (80 percent or more), states under it, and for each the threshold, the measurement period the state uses, what sales count (gross, retail or taxable only), whether marketplace sales count, when registration must happen, and the state revenue department source. Unclear cases give the SAFE answer (treated as over) with what it depends on. Free.
`list_capabilities`	Lists coverage (45 sales tax states plus DC, and the 5 states with no statewide sales tax), the date the data was last checked, and related Nero Labs Rules servers. Free.
`list_nexus_thresholds`	Lists the economic nexus threshold of every US sales tax state (or one state) on a date: dollar and transaction thresholds, and/or logic, measurement period, what counts, marketplace rules, when to register and the official source. Also lists the states with no statewide sales tax. Free.
`list_upcoming_nexus_changes`	Lists economic nexus threshold changes in a date window (for example states dropping the 200 transaction test), soonest first, with the old and new rule and source. Use a past from_date to see recent changes. Free.

Schemas: list_tools.

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Official server.json

{
  "name": "io.github.Nero-Engine/us-sales-tax-nexus",
  "title": "US Sales Tax Economic Nexus Check",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://us-sales-tax-nexus.nerolabs.workers.dev/mcp",
      "type": "streamable-http"
    }
  ],
  "version": "1.0.0",
  "websiteUrl": "https://us-sales-tax-nexus.nerolabs.workers.dev/",
  "description": "Which US states must a remote seller register in for sales tax? Every state's nexus rule. Sourced."
}