# US Business Calendar MCP

> US federal holidays, business-day maths, invoice due dates and IRS deadlines.

- name: io.github.donniertf-hub/us-business-calendar-mcp
- version: 1.0.0
- connection class: R0 (autonomous)
- trust: 89/100 flags: duplicate-repo
- quality: 79/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/io.github.donniertf-hub%2Fus-business-calendar-mcp
- tools: https://api.protogrid.dev/v1/servers/io.github.donniertf-hub%2Fus-business-calendar-mcp/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "us-business-calendar-mcp": {
      "type": "http",
      "url": "https://us-business-calendar-mcp.donniertf.workers.dev/mcp"
    }
  }
}
```


## Trust

- hygiene: 60
- liveness: 99
- freshness: 100
- provenance: 90
- drivers: +repository +namespace-matches-repo +website +reachable +uptime-97% +updated-9d-ago -duplicate-repo(95 names)
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 79/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-03-26; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 71 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: business_days (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); next_holidays (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); irs_deadlines (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
- pass `tools.token_cost`: about 681 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 9, about 681 tokens to load them all
- tool set hash: 7686ca43bc18db006b1aa57c706db8d0
- badge: [![protogrid quality](https://protogrid.dev/badge/io.github.donniertf-hub/us-business-calendar-mcp.svg)](https://protogrid.dev/servers/io.github.donniertf-hub/us-business-calendar-mcp)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://us-business-calendar-mcp.donniertf.workers.dev/mcp (streamable-http, auth none, reachable true, uptime30d 0.9714286)

## Packages

_none_

## Tools (9)

- `business_days`: PRO. Count US business days between two dates (excludes weekends and federal holidays).
- `cert_history`: Active TLS certificates for a domain from Certificate Transparency logs (crt.sh): issuers, names, validity dates.
- `domain_age`: FREE. Domain trust quick check: registration date, age in days, registrar, expiry and risk flags from RDAP. Accepts a domain or URL.
- `domain_trust_report`: Full domain/URL trust report: RDAP registration, registrar, status, nameservers, plus active TLS certificates and issuers from crt.sh, with risk flags.
- `due_date`: PRO. Due date after N business days or N calendar days (rolled to next business day) — Net 30/60, ACH settlement, contract notice periods.
- `email_domain_check`: Email/domain deliverability check: MX records, SPF and DMARC policy for a domain or email address (DNS over HTTPS).
- `iban_validate`: FREE. Validate an IBAN offline: country, length and ISO 13616 mod-97 checksum, plus bank code and formatted IBAN. No outside source.
- `irs_deadlines`: PRO. Upcoming IRS filing and payment deadlines for the next N months (individual, payroll, corporate), adjusted for weekends/holidays; optional fiscal_year_end.
- `next_holidays`: FREE. Next 3 US federal holidays (with observed dates) and whether today is a business day.