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xhelio-spice

xhelio-spice is a skill for Claude Code, Codex from huangzesen/xhelio-spice. It costs 22 tokens per session (438 once invoked), scanned A, original, MIT.

A tool for finding the positions and movement of spacecraft, planets, moons, asteroids, and other solar-system bodies. It uses SPICE, a NASA-supported data format and software system for space-mission geometry.

In plain words
What is it for?
Use it to get positions and velocities, measure distances over time, convert between coordinate systems, and manage the required data files.
Why use it?
It removes the need to find, download, load, and interpret the mission data files manually.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 0repo 4mo ago A scan 22 tokens original MIT

Good fit Use it to get positions and velocities, measure distances over time, convert between coordinate systems, and manage the required data files.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/huangzesen/xhelio-spice/xhelio-spice-skill
View source ↗ huangzesen/xhelio-spice
Install

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.

Any agent
npx skills add huangzesen/xhelio-spice --skill xhelio-spice-skill
Clone the repo
git clone --depth 1 https://github.com/huangzesen/xhelio-spice

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for xhelio-spice

README.md
[![agentmods](https://agentmods.dev/badge/skills/huangzesen/xhelio-spice/xhelio-spice-skill/github.svg)](https://agentmods.dev/skills/huangzesen/xhelio-spice/xhelio-spice-skill)
Your own site
<a href="https://agentmods.dev/skills/huangzesen/xhelio-spice/xhelio-spice-skill"><img src="https://agentmods.dev/badge/skills/huangzesen/xhelio-spice/xhelio-spice-skill/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.

agentmods 80×15 button for xhelio-spice

Your own site · 80×15
<a href="https://agentmods.dev/skills/huangzesen/xhelio-spice/xhelio-spice-skill"><img src="https://agentmods.dev/badge/skills/huangzesen/xhelio-spice/xhelio-spice-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 438 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00022 $0.00438
Opus 5.5 $0.00009 $0.00175
Sonnet 5.5 $0.00004 $0.00088
Haiku 4.5 $0.00002 $0.00044

Measured 2mo ago against content hash 163bee0648e3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

xhelio-spice 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 2mo 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.

xhelio-spice-skill/SKILL.md · 43 lines

What it actually says

XHelio-SPICE

Query spacecraft and planetary ephemeris data using SPICE kernels.

Setup

pip install xhelio-spice

What You Can Query

Spacecraft (43): Parker Solar Probe, Solar Orbiter, Juno, Cassini, Voyager 1/2, Mars 2020, MRO, New Horizons, Europa Clipper, Psyche, BepiColombo, JUICE, Lucy, Galileo, Dawn, MESSENGER, SOHO, IBEX, STEREO-A/B, Helios 1/2, Ulysses, Van Allen Probes, THEMIS, MAVEN, LRO, and more...

Planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto

Moons: Moon, Titan, Europa, Ganymede, Io, Phobos, Deimos, and many more

Other: Sun, asteroids, comets, Solar System Barycenter

Tools

  • get_ephemeris — Position and velocity at single time (inline) or timeseries (written to CSV)
  • compute_distance — Distance between two bodies over time range (min/max/mean, closest approach)
  • transform_coordinates — Transform vectors between coordinate frames (RTN, J2000, ECLIPJ2000, etc.)
  • list_spice_missions — List all supported spacecraft
  • list_coordinate_frames — List available coordinate frames
  • manage_kernels — Check status, download, load, or purge kernel cache

Examples

  • "Where is Parker Solar Probe right now?"
  • "What's Earth's distance from the Sun?"
  • "Show me Juno's trajectory for January 2024"
  • "When did Mars get closest to Jupiter in 2024?"
  • "Convert this RTN vector to J2000 frame"
  • "What's the current Moon position?"
Changes

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.

  1. 2mo ago First seen · 43 lines · 22 tokens per session scan A 163bee0648e3

Subscribe to this mod's changes

xhelio-spice is a skill published in the GitHub repository huangzesen/xhelio-spice (0 stars, last pushed 4mo ago), licensed MIT. It adds 22 tokens to every session and 438 once invoked, about $0.0001 per session on Opus 5.5. 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.

Scientific
Related

xhelio-spice compared with skills from other repositories

xhelio-spice next to 6 skills from other repositories
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xhelio-spicehuangzesen/xhelio-spiceSkill04mo agoMITA22Claude Code, Codex
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exploratory-data-analysisK-Dense-AI/scientific-agent-skillsSkill56k5d agoMITA83Claude Code
matlabK-Dense-AI/scientific-agent-skillsSkill56k5d agoMITA44Claude Code
phylogeneticsK-Dense-AI/scientific-agent-skillsSkill56k5d agoMITA71Claude Code, Codex
research-engineerdavila7/claude-code-templatesSkill33ktodayMITA43Claude Code, Codex
mapping-to-snomedmaziyarpanahi/openmedSkill5.8ktodayApache-2.0A205Claude Code