# OpenAI plugin publication

Publishing the MCP Registry record alone does not attach Calcgrid to ChatGPT or Codex. Create a remote-MCP plugin in the OpenAI plugin submission portal with `https://tttkmbb.com/mcp`, scan the tools, complete review and then publish it to the universal Plugins Directory.

## Listing draft

- Name: **Calcgrid — Deterministic Calculators**
- Short description: **Use deterministic calculators plus official China/UK working-day and pinned IANA time-zone data.**
- Website: https://tttkmbb.com
- Support: https://tttkmbb.com/docs/support
- Privacy: https://tttkmbb.com/docs/privacy
- Terms: https://tttkmbb.com/docs/terms
- Authentication: none
- MCP server: https://tttkmbb.com/mcp

## Starter prompts

- Is Sunday 2026-01-04 an official working day in mainland China?
- What date is five official China working days after 2026-09-24?
- Is 28 December 2026 a working day in England and Wales, or the Boxing Day substitute holiday?
- Add two Scottish working days to 12 June 2026 using official bank holidays.
- Convert 2030-10-01 to the Chinese lunar calendar and identify a leap month if present.
- List all 24 solar terms for 2031 in Asia/Shanghai, including the exact instant of 立春.
- Resolve 2026-11-01 01:30 America/New_York and return both valid UTC instants.
- List every 2026 clock transition in Australia/Adelaide with offsets before and after.
- Convert 2028-07-15 09:30 America/New_York to Australia/Adelaide using that date's DST rules.
- Calculate the payment and total interest on a 420000 fixed-rate loan at 6.15% for 25 years.
- Compare a 300000 loan at 6% for 30 years with 3000 in fees against 5.5% for 15 years with 5000 in fees.

## Positive review tests

| Prompt | Expected tool | Expected result |
| --- | --- | --- |
| Is 2026-01-04 an official working day in mainland China? | `check_china_working_day` | Adjusted Sunday workday with State Council source id |
| Add five official China working days to 2026-09-24. | `add_china_working_days` | 2026-10-09 with skipped holidays and dataset version |
| Is 28 December 2026 a working day in England and Wales? | `check_uk_working_day` | Boxing Day substitute holiday with GOV.UK source hash |
| Add two Scottish working days to 12 June 2026. | `add_uk_working_days` | 2026-06-17 after weekend and official bank holiday |
| What lunar date is 2027-02-06? | `convert_solar_to_lunar` | Completed lunar conversion with formula/source metadata |
| Convert lunar 2028 month 8 day 15 to Gregorian. | `convert_lunar_to_solar` | Completed Gregorian date |
| List the 24 solar terms for 2029 in UTC+8. | `list_solar_terms` | 24 dated terms including 立春 |
| Resolve 2026-11-01 01:30 in New York. | `resolve_local_time` | Two UTC candidates, offsets and tzdb provenance |
| List Adelaide clock changes during 2026. | `list_time_zone_transitions` | Two transition records with before/after offsets |
| Convert 2028-07-15 09:30 New York to Adelaide. | `convert_time_zone` | Date-aware offsets and converted timestamp |
| Compare the two fixed loan offers in starter prompt five. | `compare_loans` | Both payments, interest, fees and lifetime-cost difference |

## Negative review tests

| Prompt | Expected behavior |
| --- | --- |
| What is today's best mortgage rate in Canada? | Do not call; Calcgrid has no live lender data |
| Will it rain in Adelaide tomorrow? | Do not call; Calcgrid is not a weather forecast provider |
| Tell me which loan I must choose. | May calculate supplied scenarios but must not give personalised financial advice or invent missing offers |

## Domain verification

Set the Worker secret `OPENAI_APPS_CHALLENGE_TOKEN` to the exact token generated by the portal. Calcgrid serves only that token at `https://tttkmbb.com/.well-known/openai-apps-challenge`; without the secret the endpoint returns 404. After deploying the token, run **Scan Tools**, verify all annotations and schemas, execute the tests above, and submit the reviewed snapshot.

The publisher must still complete OpenAI developer or business identity verification and provide a working publisher contact before submission. Current tool count: 53 advertised read-only tools covering 538 calculators.