Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add openephemeris/openephemeris-MCP --skill openephemeris-api-referencegit clone --depth 1 https://github.com/openephemeris/openephemeris-MCPWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/openephemeris/openephemeris-mcp/openephemeris-api-reference)<a href="https://agentmods.dev/skills/openephemeris/openephemeris-mcp/openephemeris-api-reference"><img src="https://agentmods.dev/badge/skills/openephemeris/openephemeris-mcp/openephemeris-api-reference/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/openephemeris/openephemeris-mcp/openephemeris-api-reference"><img src="https://agentmods.dev/badge/skills/openephemeris/openephemeris-mcp/openephemeris-api-reference.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00057 | $0.03111 |
| Opus 5 | $0.00028 | $0.01555 |
| Sonnet 5 | $0.00011 | $0.00622 |
| Haiku 4.5 | $0.00006 | $0.00311 |
Grade A, and why
openephemeris-api-reference scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 263 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OpenEphemeris API Reference
Quick reference for all 120 endpoints across 19 groups. Every endpoint works via:
- MCP
dev_read_api/dev_write_apiwithmethod+path(for allowlisted endpoints — seedev_list_allowed) - Direct REST to
https://api.openephemeris.comwith headerX-Meridian-API-Key: oe_...
Always pass format=llm (query param or body field) unless raw JSON is requested — reduces tokens ~73%.
Standard Procedure Reminder
For ANY chart endpoint that takes birth data:
GET /location/autocomplete?query=<city>→ lat/lonPOST /timezone/lookupwith{latitude, longitude}→ IANA timezone string- Build
birth_locationwith latitude, longitude, AND timezone — all three required - Build
birth_datetimewithisofield as local civil time (the engine handles UTC conversion) - Call the chart endpoint
ACG / Astrocartography (16)
| Method | Path | Tier | Description |
|---|---|---|---|
| POST | /acg/power-lines |
Dev | Planet AC/MC/DC/IC lines globally |
| POST | /acg/hits |
Dev | Lines near a target city |
| POST | /acg/crossings |
Scale | Where two lines intersect |
| POST | /acg/parans |
Dev | Latitude bands where two planets are simultaneously angular |
| POST | /acg/midpoints |
Scale | Planetary midpoint lines |
| POST | /acg/declination-lines |
Scale | Parallels of declination |
| POST | /acg/aspects |
Scale | Where natal planets aspect local angles |
| POST | /acg/local-space |
Dev | Azimuthal directions from a reference city |
| POST | /acg/hermetic-lines |
Dev | Hermetic Lots projected as lines |
| POST | /acg/relational-parans |
Scale | Parans for two-person synastry |
| POST | /acg/ccg |
Scale | Cyclocartography time-series |
| POST | /acg/ccg/parans |
Scale | Transit parans |
| POST | /acg/heatmap/composite |
Service | Composite heatmap |
| POST | /acg/features |
Service | Combined ACG feature collection |
| GET | /acg/datasets |
Free | Available ACG datasets |
| GET | /acg/meta |
Free | ACG engine metadata |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 263 lines · 57 tokens per session scan A 3444fc5e6762
openephemeris-api-reference is a skill published in the GitHub repository openephemeris/openephemeris-MCP (4 stars, last pushed yesterday), licensed MIT. It adds 57 tokens to every session and 3,111 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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