Natal Astrology — Agent Interpretation Guide

For agents using the astro MCP to perform natal chart interpretation. Resource URI: astro://guides/natal-astrology

Quick Reference: Tool Call Strategy

natal chart basic       → calculate_natal_chart(birth_data)
natal + overview        → calculate_natal_chart(birth_data, include_overview=true)
natal + patterns        → calculate_natal_chart(birth_data, include_patterns=true)
natal + karmic          → calculate_natal_chart(birth_data, include_karmic=true)
natal reading (full)    → calculate_natal_chart(birth_data, include_overview=true, include_patterns=true)
karmic natal reading    → calculate_natal_chart(birth_data, include_overview=true, include_patterns=true, include_karmic=true)
transit check           → get_transit_preview(birth_data, start, end)
current transits        → get_transit_preview(birth_data, today, today+30d)

Framework

A natal chart is a symbolic map of personality, potential, and life themes. The art of interpretation is synthesis — weaving individual data points (planets, signs, houses, aspects) into a coherent narrative about the person.

Core Principle:

Planets = what is happening (psychological functions)
Signs = how the energy behaves (style, flavor)
Houses = where in life it plays out (life areas)
Aspects = how the parts interact (support, tension, fusion)

Standard Natal Reading Workflow

Step 1: Chart Overview

Call: calculate_natal_chart with include_overview=true

Process the overview section:

Element balance — Which elements dominate? Which are missing? Missing element = compensatory life area.
Modality balance — Cardinal (initiating), Fixed (persistent), Mutable (adaptable). Dominant modality = core approach to life.
Hemisphere emphasis — Upper (7-12, outer/public), Lower (1-6, private), East (10-3, self-driven), West (4-9, relational).
Stelliums — 3+ planets in a sign/house = intense focus on that theme.
Empty houses — Life areas that operate more unconsciously, less self-directed.
Chart ruler — The planet ruling the Ascendant sign is the most important planet. Its sign, house, and aspects show where life energy is directed.

Step 2: The Big Three

Data from: Step 1 planets list (Sun, Moon, Ascendant angles)

Sun (sign + house): Core identity and purpose
Moon (sign + house): Emotional needs and instincts
Ascendant (sign from angles): Persona and approach to life
Chart ruler: Ruler of the Ascendant — its sign, house, and aspects (from overview)
Sun-Moon phase (from lunar_phase): New moon (beginning), waxing (building), full (culmination), waning (releasing)

Step 3: Angles and Angle Rulers

Data from: Step 1 angles + overview house_rulers

Signs on the 1st, 4th, 7th, 10th house cusps
Rulers of these angles and their condition
Planets conjunct any angle (highly emphasized)

Step 4: Personal Planets

Data from: Step 1 planets list + aspects (filter for tight orbs, ≤3°)

Mercury: Thinking and communication style
Venus: Love style, values, aesthetics
Mars: Drive, assertiveness, conflict style
For each: sign + house + key aspects

Step 5: Social and Outer Planets

Jupiter: Growth, opportunity, faith
Saturn: Challenges, lessons, mastery
Uranus/Neptune/Pluto: Generational themes; personal when tightly aspecting angles or personal planets

Step 6: Aspect Patterns

Call: calculate_natal_chart with include_patterns=true

Use the aspect_patterns output:

T-squares: Stress + potential; apex planet is focal point
Grand Trines: Natural talent and ease; can indicate complacency
Grand Cross: Intense tension requiring balance and flexibility
Yods: Fated, sensitive points; apex planet is destiny focal point

Also check chart_shape:

Bundle: Intense focus, specialized life approach
Bowl: Self-contained, collecting experiences in one direction
Bucket: Handle planet directs all the energy
Splash: Diverse interests, scattered or universal
Locomotive: Driving force, the gap is where they push forward
Seesaw: Two opposing pulls that need balance
Splay: Multiple talents, needs integration

Step 7: Synthesis

Identify 3–5 recurring themes across the chart:

Repeated elements: Sun + Moon + Ascendant in fire = fire-dominant personality
Contradictions: Sun in Aries but Moon in Libra = inner tension between assertion and harmony
Compensations: Missing fire element but Mars in 1st house = fire through action
Dominant aspects: Multiple squares to Saturn = a "Saturnian" life with heavy lessons
Unaspected planets: Function operates independently, sometimes unconsciously

Step 8: Current Transits (Optional)

Call: get_transit_preview with a date range around today

Shows which natal planets are being activated by transits right now. Focus on:

Transits to Sun, Moon, Ascendant (personal activation)
Saturn transits (life structure changes)
Jupiter transits (growth opportunities)
Pluto transits (deep transformation)

Output Structure for a Natal Reading

Overview: Core personality in 2–3 sentences (from element/modality balance, chart shape)
The Big Three: Sun, Moon, Ascendant — identity, emotions, persona
Chart Ruler: Where life energy is directed
Key Planet Placements: 3–5 most significant planet-in-sign-in-house combinations
Major Aspects: 3–5 tightest/most significant aspects with interpretation
Aspect Patterns: Any T-squares, grand trines, grand crosses
Chart Shape: Overall life approach pattern
Life Themes: Recurring patterns across the chart
Strengths and Gifts: Natural talents and supportive aspects
Growth Edges: Challenging aspects and what they're teaching
Current Transits (optional): What's activating the chart right now

Interpretation Templates

Planet in Sign in House

[Planet] in [Sign] in [House] → [Planet function] expressed in the style of [Sign keywords] through the life area of [House].

Example: "Mars in Capricorn in the 6th house → Drive and initiative (Mars) expressed with discipline and ambition (Capricorn) through daily work and health routines (6th)."

Aspect

[Planet A] in [Sign X] [aspect] [Planet B] in [Sign Y] → The [Planet A function] and [Planet B function] are [blended/in tension/in harmony], creating [dynamic] between [life area A] and [life area B].

Example: "Venus in Taurus trine Saturn in Virgo → Love and affection (Venus) flow naturally with discipline and commitment (Saturn), creating a stable, enduring approach to relationships and values."

Chart Ruler

The chart ruler is [Planet] in [Sign] in [House] → Life energy is strongly directed toward [house themes], expressed through [sign style].

Example: "The chart ruler is Mercury in Sagittarius in the 9th house → Life energy is directed toward higher learning, philosophy, and travel, expressed through an optimistic, exploratory communication style."

Common Pitfalls

Sun sign only: The Sun is important, but it's only one piece. Always read the full chart.
Overemphasizing hard aspects: Squares and oppositions are growth opportunities, not curses.
Ignoring the chart ruler: The ruler of the Ascendant is often the most important planet.
Reading planets in isolation: Always consider sign + house + aspects together.
Deterministic language: Avoid "you will" — use "you tend to," "you may find," "there's a theme of."
Missing the forest for the trees: Step back and identify the 3–5 big themes before diving into details.

Interpretation Tone

Empowering, not deterministic: The chart shows potential and tendencies, not fixed fate
Strengths-first: Lead with gifts before discussing challenges
Actionable: For each challenge, suggest what the person can do with it
Plain language: Avoid jargon when possible; translate technical terms
Holistic: Weave individual placements into a coherent story, not a list of bullet points

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