list_solar_terms
Use this when you need the date or time of 立春, 清明, 夏至, 冬至 or any other solar term in a given year, or the full 24-term table. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when you only need the term that ...
This record as markdown: /tools/com-tttkmbb-calcgrid/list-solar-terms.md
What list_solar_terms does on Calcgrid
AI agents call list_solar_terms to retrieve information from Calcgrid without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
year | integer | Yes | Gregorian calendar year (1900–2100). |
utc_offset_hours | number | — | Fixed UTC offset in hours for the local date-times (8 = China Standard Time; 9 = Japan/Korea; 5.5 = India). Unit: h. |
Parameters from the server's own tool schema.
Why list_solar_terms is rated Low
Even though list_solar_terms only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs list_solar_terms safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Calcgrid, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_solar_terms, this is the rule to start with:
list_solar_terms is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Calcgrid, apply this rule, and every list_solar_terms call is checked against it from then on.
Questions about list_solar_terms
Use this when you need the date or time of 立春, 清明, 夏至, 冬至 or any other solar term in a given year, or the full 24-term table. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when you only need the term that a specific date falls in (use lunar-calendar-converter), or you need sunrise/sunset times (use sunrise-sunset). What it computes: Lists the 24 solar terms (节气 jieqi) of a Gregorian year with their exact instants: the moments the Sun's apparent longitude reaches multiples of 15°, computed astronomically and shown in a chosen UTC offset (China Standard Time by default). Example user requests: List all 24 solar terms for 2027 in UTC+8. | 2026 年立春和冬至的准确时间是什么？ | When is Qingming this year in China Standard Time? Inputs: year (integer); utc_offset_hours (number, h, optional). Complete JSON argument examples: {"year":2024,"utc_offset_hours":8} | {"year":2026,"utc_offset_hours":8} Outputs: terms, lichun_date, spring_equinox, summer_solstice, autumn_equinox, winter_solstice, year_ganzhi, suishou_note, utc_offset. Formula: term instant: apparent geocentric solar longitude λ(JDE) = k·15° for k = 0 (春分) … 23 (惊蛰), solved by Newton iteration; UT = TT − ΔT; local time = UT + utc_offset_hours Direct REST fallback: POST https://tttkmbb.com/api/v1/calculate/solar-terms with the same JSON input fields. Do not guess another /api/* path. Docs: https://tttkmbb.com/lunar/solar-terms.md. It is categorised as a Read tool in the Calcgrid MCP Server, which means it retrieves data without modifying state.
list_solar_terms accepts 2 parameters: year, utc_offset_hours. Required: year. The full parameter table on this page comes from the server's own tool schema.
Register the Calcgrid MCP server in PolicyLayer and add a rule for list_solar_terms: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Calcgrid. Nothing to install.
list_solar_terms is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_solar_terms rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for list_solar_terms. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
list_solar_terms is provided by the Calcgrid MCP server (https://tttkmbb.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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