homemaker-layout/examples/harbor-house/patterns.config
Claude 4931070602
Outdoor space: enforce the per-level rule, drop the fraction
Owner: "maybe plot_ratio is having unintended consequences, Alexander simply
says that all levels should have accessible outside space, he doesn't say how
much."

Both halves are right, and the codebase had the two rules the wrong way round.

ratio_outside is a gaussian on the outdoor FRACTION, applied as a whole-building
multiplier, and its declared targets have no stated basis and contradict each
other: health-centre targets 0.06 and sits at 0.096-0.129, so it is penalised
x0.39-x0.77 for having too MUCH; programme-house targets 0.30 and sits at
0.098-0.293, penalised x0.40-x0.999 for having too LITTLE. Penalties as large as
the ratio_circulation ones 39.24 removed, pulling two programmes in opposite
directions on the same quantity.

force_roof_garden already implements the rule Alexander actually states -- per
level, no outdoor space at all is a hard fail, no quantity attached. It has
existed all along and was switched OFF in every corpus config.

Near-miss worth recording: measuring first, I found zero "no outside space"
fails across the twelve baseline runs and briefly read that as the requirement
being met everywhere. It meant the check never ran. Same shape as 39.20's parity
tests -- no failures from a test that is not executing looks exactly like no
failures from a test that passes, and the tell was again the config, not the
code.

Enabled, it bites on 4 of 25 baseline levels: maple s0 level 1, and
programme-house level 0 in all three seeds. A house with no outdoor space on its
own ground floor is a fair criticism of the layout, and exactly what a
building-level fraction cannot catch, since 22% outdoor concentrated on one
storey satisfies it perfectly.

The upper side ratio_outside used to provide is covered in a better currency by
the minimum-internal-area factor (internal area >= 1.2x the programme's declared
room area), which is live -- binding on harbor s0 x0.920 and programme-house s0
x0.787.

This is the one change in 39.22-39.25 whose risk is NOT measured: nothing here
proves the outdoor fraction will not drift up once the search is free to raise
it, and outdoor space is profitable (1.64 return against a room's 0.66). The
re-baseline (bk9) is what shows it, and 39.25 asks for the fraction to be
recorded there.

4 hard fails added, none removed. 426 passed.

Refs homemaker-py-hxi.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MJ84Feep79Hhm3E4zZJmnB
2026-09-06 15:41:22 +00:00

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---
# Harbor House - Programme-driven building evolution (Simplified)
# Two-story community living facility for 50+ residents
# Using anonymous interchangeable rooms to reduce complexity
# Building programme: community living spaces
spaces:
# GROUND FLOOR - Main Community Areas
cr1:
usage: living
name: Common Room with Fireplace
size:
- 80.0
- 10.0
width:
- 6.0
- 1.5
proportion:
- 2.0
- 0.5
level: 0
adjacency:
- c
- o
ef1:
usage: none
name: Entrance Foyer
size:
- 15.0
- 3.0
width:
- 3.0
- 0.5
level: 0
adjacency:
- c
# homemaker-py-1s3 (§26 path b): a foyer can double as an informal meeting
# nook (Stewart Brand "loose-fit") — declared here, validated against
# interchangeable()'s S1-S4 bounds before it's ever honoured.
co_locate:
- m
da1:
usage: living
name: Dining Area
size:
- 60.0
- 8.0
width:
- 5.0
- 1.0
proportion:
- 2.5
- 0.8
level: 0
adjacency:
- c
- k1
- o
k1:
usage: kitchen
name: Kitchen
size:
- 30.0
- 5.0
width:
- 4.0
- 1.0
level: 0
adjacency:
- da1
- c
# SLEEPING AREAS - Anonymous neighborhoods (5 total, 2 ground + 3 first)
n:
usage: bedroom
name: Neighborhood
size:
- 60.0
- 8.0
width:
- 5.0
- 1.0
proportion:
- 2.0
- 0.6
adjacency:
- c
count: 5
# GROUND FLOOR - Activity Spaces
ws1:
usage: living
name: Workshop Space
size:
- 40.0
- 6.0
width:
- 5.0
- 1.0
proportion:
- 1.8
- 0.5
level: 0
adjacency:
- c
- o
# MEETING ROOMS - Anonymous interchangeable (3 total)
m:
usage: living
name: Meeting Room
size:
- 10.0
- 2.0
width:
- 2.5
- 0.5
level: 0
adjacency:
- c
count: 3
co_locate:
- ef1
# GROUND FLOOR - Service Areas
# BATHROOMS - Ground floor (3 total)
t:
usage: toilet
name: Bathroom
size:
- 6.0
- 1.5
width:
- 2.0
- 0.5
adjacency:
- c
- n # Brand: a WC beside sleeping space can be knocked through later
count: 6 # 3 ground + 3 first floor
la1:
usage: utility
name: Laundry Room
size:
- 20.0
- 4.0
width:
- 3.0
- 0.8
level: 0
adjacency:
- c
# homemaker-py-1s3: laundry and plant/M&E rooms are both "back of house"
# utility space — a common real loose-fit pairing.
co_locate:
- me1
st1:
crinkliness: none # no window needed
usage: utility
name: Ground Floor Storage
size:
- 22.0
- 4.0
width:
- 3.0
- 0.8
level: 0
adjacency:
- c
me1:
crinkliness: none # no window needed
usage: utility
name: Mechanical/Electrical Room
size:
- 25.0
- 4.0
width:
- 3.5
- 0.8
level: 0
adjacency:
- c
co_locate:
- la1
# STAFF OFFICES - Anonymous (2 total)
of:
usage: bedroom
name: Staff Office
size:
- 12.5
- 2.5
width:
- 2.5
- 0.5
level: 0
adjacency:
- c
count: 2
# FIRST FLOOR - Community Areas
li1:
usage: living
name: Library Corner
size:
- 20.0
- 4.0
width:
- 3.5
- 0.8
level: 1
adjacency:
- c
# FIRST FLOOR - Individual Rooms (10 anonymous rooms)
r:
usage: bedroom
name: Individual Room
size:
- 10.0
- 2.0
width:
- 2.5
- 0.5
level: 1
adjacency:
- c
count: 10
# FIRST FLOOR - Storage
st2:
crinkliness: none # no window needed
usage: utility
name: First Floor Storage
size:
- 18.0
- 3.5
width:
- 3.0
- 0.8
level: 1
adjacency:
- c
ut1:
crinkliness: none # no window needed
usage: utility
name: Utilities Closet
size:
- 14.0
- 3.0
width:
- 2.5
- 0.6
level: 1
adjacency:
- c
# Building constraints
storey_minimum: 2
storey_limit: 3
# homemaker-py-hxi (DESIGN.md §39.25): ENABLED. Fails a level that has no
# outdoor space at all -- Alexander's actual requirement, per level and with no
# quantity attached. It had been off in every corpus config, so the only thing
# expressing outdoor space was ratio_outside's arbitrary fraction.
force_roof_garden: 1
# Circulation ratio (allow more circulation for larger building)
# homemaker-py-hxi (DESIGN.md §39.24): disabled. The score is value/cost, a
# ratio, so the per-m2 economics (circulation worth 50 against a build cost of
# 200) is ALREADY a proportional pressure against circulation -- this said the
# same thing a second time, and with a curve where twice the corridor is far
# more than twice as bad. Its other side, "a building needs some circulation",
# was worth at most 13% here and is enforced structurally anyway by the access
# and connectivity checks. Set a [target, sigma] pair to re-enable.
ratio_circulation:
# Outside space ratio (courtyard requirement)
# homemaker-py-hxi (DESIGN.md §39.25): disabled. Alexander says every level
# should have accessible outside space; he does not say how much. The
# qualitative requirement is force_roof_garden below. Set a [target, sigma]
# pair to re-enable this quantitative one.
ratio_outside:
# Staircase requirements (main + secondary)
staircase_min: 2
staircase_max: 2
# Economic parameters
value_inside: 300.0
value_circulation: 50.0
value_outside: 100.0
# homemaker-py-ecx (DESIGN.md §39.19): an upper-level terrace is worth what
# outdoor space is worth (value_outside); it is the COST that differs by level
# (outside 10.0 vs outside_supported 110.0), not the value. At 300.0 -- the
# `value_inside` rate -- a terrace was worth more per square metre than a real
# internal room, which the owner ruled out.
value_supported: 100.0