An agent can connect on its own if it already holds ASTROLOGY_TOKEN.Remote endpoint behind a static API key or header. The registry never sees the value; the agent fills the placeholder.
tools.schemasevery tool has an object input schema
pass
tools.annotations10 of 10 tools declare readOnlyHint or destructiveHint
fail
tools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: natal_chart (destructiveHint); daily_transits (destructiveHint); sky (destructiveHint); …
pass
tools.token_costabout 3,186 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump
stability25 · weight 15
warn
stability.changes11 tool changes in 30 days
fail
stability.rug_pull2 tools kept their name but changed most of their description in 30 days; review before trusting them
dependenciesn/a · weight 15
n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package
10 tools, about 3,186 tokens to load them all · tool set 7114d3cb66ba · tools last changed 2026-10-17 · checked 2026-10-20 12:13 UTC
Tool changes
best_citieschangeddescription
before
The catalogue of major cities ranked for one chart, overall or by chosen life spheres, worldwide or in one region. (API Pro)
after · 59% of words in common
The catalogue of major cities ranked for one chart, overall or by chosen life spheres, worldwide or in one region. (API Pro) Use it when the user asks where in the world to live, work or travel; it ranks major cities, optionally by life sphere or region.
location_scorechangeddescription
before
One place against one chart: the relocated angles, the planets on them with orbs, a score for each life sphere and an overall score. (API Pro)
after · 61% of words in common
One place against one chart: the relocated angles, the planets on them with orbs, a score for each life sphere and an overall score. (API Pro) Use it when the user asks whether a specific city or place suits them; it needs a birth time and the place's coordinates.
best_dayschangeddescription
before
Every day of a window of up to 62 days scored for one activity (general, business, romance, health, creative, travel, home, clarity): helping and hindering transits, Moon phase and sign, void of course. The five best days first. (API Pro)
after · 82% of words in common
Every day of a window of up to 62 days scored for one activity (general, business, romance, health, creative, travel, home, clarity): helping and hindering transits, Moon phase and sign, void of course. The five best days first. (API Pro) Use it to pick dates for an activity within the next weeks.
solar_returnchangeddescription
before
The solar return chart for a year, cast for the birth place or another location. (API Pro)
after · 68% of words in common
The solar return chart for a year, cast for the birth place or another location. (API Pro) Use it for the year ahead from a birthday; it needs a birth time.
synastrychangeddescription
before
Two charts compared: inter-chart aspects with orbs, house overlays both ways and a score per life sphere. (API Pro)
after · 57% of words in common
Two charts compared: inter-chart aspects with orbs, house overlays both ways and a score per life sphere. (API Pro) Use it when the user asks about compatibility or a relationship and gives birth data for both people.
transitschangeddescriptionmeaning changed
before
Every transit event in a window of up to 92 days: exact transit-to-natal aspects by date, sign ingresses and stations. (API Pro)
after · 42% of words in common
Up to 60 transit events in a window of up to 92 days, the most significant kept when there are more: exact transit-to-natal aspects by date, sign ingresses and stations. (API Pro) Use it for forecasts over weeks or months (a year is four windows); for a single day use daily_transits.
usagechangeddescriptionmeaning changed
before
Your plan, today's count and when the pool refills. Costs nothing.
after · 40% of words in common
Your plan, today's count and when the pool refills. Costs nothing. Use it when a call fails on the limit, or before a long series of calls, to see the plan and what is left today.
skychangeddescription
before
Planetary positions, Moon phase and the coming week's sky events for a date (?date=YYYY-MM-DD, today by default).
after · 57% of words in common
Planetary positions, Moon phase and the coming week's sky events for a date (?date=YYYY-MM-DD, today by default). Use it for where the planets are on a date, the Moon phase, or the coming retrogrades and ingresses, when no one's chart is involved.
daily_transitschangeddescription
before
The calculated day: the sky at noon UTC, the Moon's phase, the sky events of the coming week and, with birth data, every transit to the natal chart with its orb. No generated text.
after · 61% of words in common
The calculated day: the sky at noon UTC, the Moon's phase, the sky events of the coming week and, with birth data, every transit to the natal chart with its orb. No generated text. Use it for a day's horoscope or what is happening for someone now: send birth for a personal answer, leave it out for the general sky of that day.
natal_chartchangeddescription
before
A natal chart from birth data. "part" picks what to return: full (everything: bodies with sign, degree, speed, retrograde flag and house; the angles; twelve Placidus cusps; aspects with orbs; element and quality balance; fixed-star contacts), short (Sun, Moon and Ascendant, each body's sign, retrograde bodies, dominant element and quality), or one part: planets, angles, houses, aspects, elements, fixed-stars. Full by default.
after · 73% of words in common
A natal chart from birth data. "part" picks what to return: full (everything: bodies with sign, degree, speed, retrograde flag and house; the angles; twelve Placidus cusps; aspects with orbs; element and quality balance; fixed-star contacts), short (Sun, Moon and Ascendant, each body's sign, retrograde bodies, dominant element and quality), or one part: planets, angles, houses, aspects, elements, fixed-stars. Full by default. Use it whenever the user gives a birth date, time and place and asks about their chart, signs, houses or aspects, and before interpreting anything; part=short is enough for the Sun, Moon and rising sign.
Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.
Endpoints
remote
auth
reachable
uptime 30d
p50
protocol
last ok
https://www.natalchart.ai/mcpstreamable-http
api_key ${ASTROLOGY_TOKEN}
yes
100%
378 ms
2025-06-18
2026-10-20
Tools (10)
best_citiesread-only
The catalogue of major cities ranked for one chart, overall or by chosen life spheres, worldwide or in one region. (API Pro) Use it when the user asks where in the world to live, work or travel; it ranks major cities, optionally by life sphere or region.
best_daysread-only
Every day of a window of up to 62 days scored for one activity (general, business, romance, health, creative, travel, home, clarity): helping and hindering transits, Moon phase and sign, void of course. The five best days first. (API Pro) Use it to pick dates for an activity within the next weeks.
daily_transitsread-only
The calculated day: the sky at noon UTC, the Moon's phase, the sky events of the coming week and, with birth data, every transit to the natal chart with its orb. No generated text. Use it for a day's horoscope or what is happening for someone now: send birth for a personal answer, leave it out for the general sky of that day.
location_scoreread-only
One place against one chart: the relocated angles, the planets on them with orbs, a score for each life sphere and an overall score. (API Pro) Use it when the user asks whether a specific city or place suits them; it needs a birth time and the place's coordinates.
natal_chartread-only
A natal chart from birth data. "part" picks what to return: full (everything: bodies with sign, degree, speed, retrograde flag and house; the angles; twelve Placidus cusps; aspects with orbs; element and quality balance; fixed-star contacts), short (Sun, Moon and Ascendant, each body's sign, retrograde bodies, dominant element and quality), or one part: planets, angles, houses, aspects, elements, fixed-stars. Full by default. Use it whenever the user gives a birth date, time and place and asks about their chart, signs, houses or aspects, and before interpreting anything; part=short is enough for the Sun, Moon and rising sign.
skyread-only
Planetary positions, Moon phase and the coming week's sky events for a date (?date=YYYY-MM-DD, today by default). Use it for where the planets are on a date, the Moon phase, or the coming retrogrades and ingresses, when no one's chart is involved.
solar_returnread-only
The solar return chart for a year, cast for the birth place or another location. (API Pro) Use it for the year ahead from a birthday; it needs a birth time.
synastryread-only
Two charts compared: inter-chart aspects with orbs, house overlays both ways and a score per life sphere. (API Pro) Use it when the user asks about compatibility or a relationship and gives birth data for both people.
transitsread-only
Up to 60 transit events in a window of up to 92 days, the most significant kept when there are more: exact transit-to-natal aspects by date, sign ingresses and stations. (API Pro) Use it for forecasts over weeks or months (a year is four windows); for a single day use daily_transits.
usageread-only
Your plan, today's count and when the pool refills. Costs nothing. Use it when a call fails on the limit, or before a long series of calls, to see the plan and what is left today.
protogrid