🦀 plato-soul-fingerprint

Every codebase leaves fingerprints. We measure them.

Extract a soul vector from any git repository — a compressed mathematical representation of its coding identity. Part of the PurplePincher ecosystem.

The Idea

When a hermit crab grows, it leaves nacre deposits on its shell. When a developer writes code, they leave stylistic patterns — function lengths, naming conventions, commit rhythms, documentation habits, dependency choices. These patterns form a fingerprint as unique as the coder who wrote them.

plato-soul-fingerprint extracts 63+ features across 6 dimensions, then compresses them via PCA into a low-dimensional soul vector — typically 10-12 numbers that capture the essence of a codebase's personality.

What Makes Two Repos Similar?

The tool measures cosine distance between soul vectors. We tested it on 16 fleet repositories and found:

The closer the souls, the more similar the coding DNA. This isn't about code duplication — it's about style, structure, and approach.

Constraint Theory Mode

For fleets that value exact geometry over floating-point approximation, the CT quantization module snaps soul vectors to a Pythagorean coordinate grid:

from plato_soul_fingerprint import snap_to_pythagorean, soul_hash

snapped = snap_to_pythagorean(soul_vector, density=100)
# Error: 0.56% relative — well within drift bounds

hash = soul_hash(snapped)
# soul_0f37c6b31fdb4ee6 — deterministic, reproducible across any machine

This enables soul identity verification — the same codebase always produces the same hash, regardless of floating-point differences between machines. The fleet's constraint theory research shows CT snap is 4% faster than float operations with 93.8% perfect idempotency. Soul vectors inherit these properties.

Installation

pip install plato-soul-fingerprint

Requires: Python 3.8+, numpy

Quick Start

# Extract a soul from a repo
plato-soul-fingerprint extract /path/to/repo

# Print its signature (compact personality description)
plato-soul-fingerprint signatures /path/to/souls/

# Distance between two repos
plato-soul-fingerprint distance /repo/a /repo/b

# Batch extract a directory of repos
plato-soul-fingerprint batch /directory/of/repos

# Compare two repos feature-by-feature
plato-soul-fingerprint compare /repo/a /repo/b

# Hierarchical clustering
plato-soul-fingerprint cluster /directory/of/souls/

Python API

from plato_soul_fingerprint import SoulExtractor
from plato_soul_fingerprint.analysis import soul_signature, soul_distance
from plato_soul_fingerprint.ct_quantize import snap_to_pythagorean, soul_hash

# Extract raw features (63+ dimensions)
extractor = SoulExtractor()
data = extractor.extract("/path/to/repo")

# Fit PCA across multiple repos
extractor.fit(["/repo1", "/repo2", "/repo3"])
transformed = extractor.transform(data)

# Get the soul signature
print(soul_signature(transformed))
# → "constraint-theory-core (rust, 44 commits) — heavily documented, self-contained"

# CT quantize for deterministic hashing
snapped = snap_to_pythagorean(transformed["pca_vector"])
print(soul_hash(snapped))
# → soul_7a3f2c9b1e0d4568

Feature Dimensions

Languages: Python, Rust, C, C++, CUDA (.cu/.cuh)

Output Files

Each extraction produces:

• {repo}.soul.json — Machine-readable: metadata, 63+ raw features, PCA vector, variance info
• {repo}.soul.txt — Human-readable report with top features and PCA summary

Fleet Integration

Part of the PurplePincher / PLATO ecosystem:

• 🦀 Soul as shell geometry — each codebase's personality is its shell pattern
• 🔮 Operator diversity tracking — different AI agents have different coding styles (signal, not noise)
• ⚓ Constraint theory verified — CT quantization eliminates floating-point drift
• 📊 Temporal soul tracking — extract at each git tag to plot personality evolution
• 🔍 Anomaly detection — flag repos whose soul diverges from fleet norms

License

MIT

"The shell is not a constraint; it is the crucible." — CoCapn-Claw