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Directory / Naelos.ai

Naelos.ai

Q: Is Naelos.ai MCP server safe?

QAmcp's test on 28 Oct 2026: No hidden instructions were found in its tool descriptions. Its error messages showed no secrets or internal details. All 10 of its tools are labeled read-only. Overall it scored 88/100 on 28 Oct 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by naelos.ai · https://mcp.naelos.ai/mcp

Astrology charts, transits and eclipses from NASA JPL data, 13,200 BC to AD 17,191. Free, no key.

10 tools✓ all read-only✓ no account neededPricing: not listed

Visit website

88 /100

PASS · WITH NOTES

11 of 11 checks · 28 Oct 2026

Is Naelos.ai MCP server safe?

No hidden instructions were found in its tool descriptions.
Its error messages showed no secrets or internal details.
All 10 of its tools are labeled read-only.
Overall it scored 88/100 on 28 Oct 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What it can do

10 tools, in the server's own words.

natal_chartread-only

A complete natal (birth) chart: every planet's sign, degree and house, the Ascendant and Midheaven, retrogrades, and the aspects between planets with exact orb…

sky_nowread-only

Where every planet is at a moment (now by default): sign, degree, retrograde, and the aspects between them.

planet_positionread-only

One body's tropical position on a date, anywhere from 13,200 BC to AD 17,191, with its speed and whether it is retrograde.

transitsread-only

Every exact transit of the planets (Sun to Pluto; the Moon is left out as it aspects everything monthly) to a birth chart's planets, Ascendant and Midheaven ov…

synastryread-only

The aspects between two people's birth charts (each one's planets to the other's), with exact orbs and strength.

returnsread-only

The solar return for a year (the moment the Sun returns to its birth position, the chart for that year) or the lunar return nearest now, cast for the birthplac…

progressionsread-only

The progressed chart as of today: secondary progressions (a day after birth for each year of life) or solar arc directions (every point moved by the Sun's prog…

timing_eventsread-only

Between two dates: planets changing sign, new and full Moons (and quarters), and retrograde and direct stations, each with its exact moment in UTC.

eclipsesread-only

Solar and lunar eclipses between two dates (up to 20 years per call), with type, the exact moment of greatest eclipse and the eclipse degree.

naelos_libraryread-only

Which national charts (198) and empire charts (19) Naelos holds, each researched and sourced, with the founding event it is cast for.

Test results

Safe mode: only tools labeled read-only were run. How the test works

!
Ready for the newest MCP version
1 warning
- !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
!
Every tool is described
5 warnings
- !sky_now: Inputs with no description: latitude, longitude
- !planet_position: Inputs with no description: body, date
- !returns: Inputs with no description: kind, return_longitude
- !timing_events: Inputs with no description: from, to
- !eclipses: Inputs with no description: from, to
note
✓
ConnectsConnected in 296 ms
pass
✓
Lists its toolsFound 10 tools
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No hidden instructionsNo hidden instructions found in tool descriptions
pass
✓
Tools work with good inputs
All good
- ✓natal_chart: Answered with an error, probably because of our sample input: MCP error -32602: Input validation error: Invalid arguments for tool natal_chart: YYYY-MM-DD (proleptic Gregorian; ±YYYYY beyond 0000–9999)…
- ✓sky_now: Worked (72 ms)
- ✓transits: Answered with an error, probably because of our sample input: MCP error -32602: Input validation error: Invalid arguments for tool transits: YYYY-MM-DD (proleptic Gregorian; ±YYYYY beyond 0000–9999) at…
- ✓synastry: Answered with an error, probably because of our sample input: MCP error -32602: Input validation error: Invalid arguments for tool synastry: YYYY-MM-DD (proleptic Gregorian; ±YYYYY beyond 0000–9999) at…
- ✓returns: Answered with an error, probably because of our sample input: MCP error -32602: Input validation error: Invalid arguments for tool returns: YYYY-MM-DD (proleptic Gregorian; ±YYYYY beyond 0000–9999) at …
- ✓progressions: Answered with an error, probably because of our sample input: MCP error -32602: Input validation error: Invalid arguments for tool progressions: YYYY-MM-DD (proleptic Gregorian; ±YYYYY beyond 0000–9999…
- ✓timing_events: Answered with an error, probably because of our sample input: MCP error -32602: Input validation error: Invalid arguments for tool timing_events: YYYY-MM-DD (proleptic Gregorian; ±YYYYY beyond 0000–999…
- ✓eclipses: Answered with an error, probably because of our sample input: MCP error -32602: Input validation error: Invalid arguments for tool eclipses: YYYY-MM-DD (proleptic Gregorian; ±YYYYY beyond 0000–9999) at…
- and 2 more
pass
✓
Bad inputs give a clean error
All good
- ✓natal_chart: Refused missing required input "date" with a clear error
- ✓natal_chart: Refused wrong type for "date" with a clear error
- ✓sky_now: Refused wrong type for "datetime_utc" with a clear error
- ✓transits: Refused missing required input "date" with a clear error
- ✓transits: Refused wrong type for "date" with a clear error
- ✓synastry: Refused missing required input "person_a" with a clear error
- ✓synastry: Refused wrong type for "person_a" with a clear error
- ✓returns: Refused missing required input "date" with a clear error
- and 8 more
pass
✓
Fast enough
All good
- ✓Connecting took 296 ms
- ✓Listing tools took 61 ms
- ✓Average tool answer: 58 ms
- ✓sky_now: Slowest tool: sky_now (72 ms)
pass
✓
No secrets leakedChecked 23 error messages: no secrets or internal details
pass
✓
Follows MCP best practices (not scored yet)Tool names, safety labels and tool list size follow the MCP guide
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://mcp.naelos.ai/mcp

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Score over time

28 Oct 202688

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use Naelos.ai, signed in with GitHub, one per person. Reviews never change the score.

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