# RevitMCPBridge

"Teaching AI to Build"

## Episode 3: First Autonomous Breakthrough

December 2024

## THE TEST

December 2024

REVIT

[ Empty Floor Plan ]

Project1.rvt

Start with nothing. End with something.

## THE PROMPT

Claude Code

> Create a small office floor plan with perimeter walls, interior partitions, and a lobby area.

Claude: Let me check the available levels and wall types, then create your floor plan...

Natural language. That's all it took.

## CLAUDE'S PROCESS

STEP 1: Query the model
getLevels() → Level 1 (ID: 30) at 0'-0"
getWallTypes() → Generic - 8" (ID: 441451)
STEP 2: Plan the geometry
Building: 80' x 50' = 4,000 SF
Lobby: 20' x 25' near entrance
Offices: 10' x 12' typical
STEP 3: Execute commands
createWall() x 30

## COMMANDS FLOWING TO REVIT

{"method":"createWall","params":{"startPoint":[0,0,0],

"endPoint":[80,0,0],"levelId":30,"height":10}}

{"method":"createWall","params":{"startPoint":[80,0,0],

"endPoint":[80,50,0],"levelId":30,"height":10}}

{"method":"createWall","params":{"startPoint":[80,50,0],

"endPoint":[0,50,0],"levelId":30,"height":10}}

... 27 more commands ...

Precise. Coordinated. Autonomous.

## THE MOMENT

BEFORE
Empty
→
AFTER
IT WORKED.

## WHAT THIS MEANT

✓ AI can reason about architectural space
✓ AI can translate intent to precise geometry
✓ AI can execute multi-step workflows autonomously
✓ The bridge actually carries real load

This wasn't a demo. This was a foundation.

## IT WASN'T ALL SMOOTH

PROBLEM 1: Transaction Rollback
Walls created, then disappeared. Revit warnings were causing automatic undo.
PROBLEM 2: Coordinate Confusion
First attempts used wrong units—inches instead of feet. Walls 12x smaller than expected.
PROBLEM 3: Overlapping Walls
No collision detection. Walls placed on top of each other at corners.

Every bug was a lesson. Every fix, progress.

## THE WARNINGSWALLOWER PATTERN

// Before: Transaction would rollback on warnings

trans.Commit(); // ← Warnings = failure

// After: Suppress warnings, let it complete

using (var swallower = new WarningSwallower())

{

trans.SetFailureHandlingOptions(

swallower.GetOptions());

trans.Commit(); // ← Warnings ignored

}

A pattern we'd use 85+ times across the codebase.

## FIRST SUCCESS: THE NUMBERS

30
walls created
11
rooms formed
4,000
square feet
0
mouse clicks

< 60 seconds total execution time

## THE PARADIGM SHIFT

BEFORE

"Draw wall here"
"Extend to there"
"Add door at X"

Human drives
every action

→
AFTER

"Create a room"
(Claude decides
where, how, what)

AI drives
from intent

You describe the outcome. Claude figures out the how.

## BUT THIS WAS JUST THE BEGINNING

30 methods → 705+ methods

30 Growth: 1,400% 705

## Next Episode:

# "From Methods to Intelligence"

How 30 methods became 705 methods.
How commands became comprehension.

BIM Ops Studio

www.bimopsstudio.com

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Audio
BIM Ops Studio