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qwispr

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qwispr — Hybrid Quantum/Classical Code Intelligence

Routes software engineering problems to quantum algorithms (QAOA, VQE, Grover, QWalk, QSVM) on PennyLane simulators with deterministic classical fallback.

qwispr is a CLI + MCP server that treats SE problems as optimization/quantum problems: dependency conflicts → QAOA, test generation → VQE, code search → Grover amplification, call-graph analysis → QWalk, refactoring → QWalk+QSVM. Runs locally on default.qubit/lightning.qubit — no cloud credentials required.

Table of Contents

Related MCP server: code-graph-mcp

Quickstart

# Install
npm i -g qwispr

# 1. Analyze a file (call-graph + QWalk metrics)
qwispr analyze --file src/cli.ts --entry main

# 2. Search with Grover amplification
qwispr search --pattern "eval|dangerous" --files "src/**/*.ts" --top 10

# 3. Resolve dependency conflict (QUBO → QAOA)
echo '{"Q":[[1,-2],[-2,1]]}' > qubo.json
qwispr run --task resolve --qubo qubo.json --vars 2

# 4. Generate test inputs that hit branches (VQE)
qwispr testgen --file src/utils.ts --function parseJson --layers 2

# 5. Get refactoring suggestions (QWalk+QSVM)
qwispr refactor --file src/cli.ts --top 5

# 6. Run MCP server (for VS Code / Claude / etc.)
qwispr mcp --stdio

Installation

Method

Command

npm (global)

npm i -g qwispr

npx (no install)

npx qwispr --help

Docker

docker run --rm ghcr.io/qwispr/qwispr:latest --help

From source

git clone https://github.com/qwispr/qwispr && cd qwispr && npm ci && npm run build

Requirements:

  • Node.js ≥ 20

  • Python ≥ 3.11 + PennyLane (auto-installed via pip on first quantum run)

  • Fallback: QWISPR_DEVICE=default.qubit runs pure Python (no C++ deps)

Commands

Command

Alias

Description

analyze

qwalk

Call-graph + QWalk metrics (reachability, centrality, diameter, hotSpots; diameter -1 = disconnected)

search

grover

Grover-ranked regex search over glob

vqe

—

VQE ground-state for QUBO

testgen

—

VQE boundary test inputs for a function

refactor

—

QWalk+QML refactoring candidates

run

orchestrate

Hybrid router (classical vs quantum)

hardware

backend

List backends + current device

mcp

—

stdio JSON-RPC server (5 tools)

Global options:

--backend simulator|lightning   (also QWISPR_BACKEND env)
--help, -h                      show help

Problem → Algorithm Map

SE Problem

Quantum Algorithm

Skill

How it Works

Dependency resolution (lockfile conflicts)

QAOA

qaoa-agent

QUBO → Ising Hamiltonian → RZZ/RZ + RX mixer, GradientDescent optimizer

Code search (AST/regex patterns)

Grover

grover-agent + search-agent

Analytic Grover iteration (π/4√(N/M)) amplifies matching hits

Test generation (branch coverage)

VQE

vqe-agent + testgen-agent

Branch-distance QUBO → hardware-efficient ansatz RY/RZ+CNOT → parameter-shift

Call-graph analysis (reachability, centrality)

QWalk

qwalk-agent + analyze-agent

BFS + BTree + Floyd (classical fallback; quantum coin+shift for n≤8)

Refactoring suggestions (god functions)

QWalk + QSVM

refactor-agent

Centrality × (1 − cohesion) via simulated RBF kernel

Fragment classification (buggy/clean)

QSVM

qml-agent

Token/AST/n-gram → RY angles → RBF `

MCP Server

qwispr exposes 5 tools via stdio JSON-RPC (MCP protocol):

# Start server
qwispr mcp --stdio

# List tools
echo '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' | qwispr mcp --stdio

# Call analyze
echo '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"analyze","arguments":{"file":"src/cli.ts"}}}' | qwispr mcp --stdio

Tool

Description

analyze

Call-graph + QWalk metrics

search

Grover-ranked regex search

testgen

VQE boundary test generation

refactor

QWalk+QML refactoring candidates

hardware

List backends + current device

Register with OpenAxe:

openaxe mcp add qwispr --cwd . -- node dist/cli.js mcp --stdio
openaxe mcp list  # shows qwispr ✓ connected

VS Code Extension

cd extensions/vscode
npm ci && npm run build    # produces dist/extension.js
vsce package               # creates qwispr-vscode-0.1.0.vsix
code --install-extension qwispr-vscode-0.1.0.vsix

Commands:

  • qwispr.analyze — call-graph + QWalk webview (hotSpots table)

  • qwispr.search — quickpick Grover-ranked results

  • qwispr.testgen — JSON input → boundary test cases

Benchmarks

# Synthetic QUBOs (n=3..8, LCG-generated)
BENCH_N=5 npm run benchmark

# Real lockfile conflicts (react/webpack/eslint/typescript)
BENCH_N=5 npm run benchmark:real

# Generate comparison report
npm run benchmark:report  # → report/index.md + report/data.json

Results (BENCH_N=2, deterministic seed):

Suite

Cases

Success Rate

Avg Time

p95

synthetic

2

100%

~4s

~4.5s

real

2

100%

~4s

~4.5s

Speedup: lightning.qubit ~2-3× faster than default.qubit (benchmarks/BENCH_DEVICE_LIGHTNING.md).

QWISPR_BACKEND=lightning BENCH_N=5 npm run benchmark

Environment Variables

Variable

Default

Description

QWISPR_BACKEND

simulator

simulator | lightning

QWISPR_DEVICE

—

Direct PennyLane device string (e.g., lightning.qubit)

QWISPR_QPU_SHOTS

1024

Shots for QPU (clamp 1..10000)

QWISPR_LAYERS

2

VQE/QAOA ansatz layers (honored by python workers/benchmark only; CLI --layers overrides)

QWISPR_ITERS

50

Optimizer iterations (honored by python workers/benchmark only; CLI --iters overrides)

QWISPR_TELEMETRY

0

Set 1 to enable ~/.qwispr/telemetry.jsonl

QWISPR_TELEMETRY_PATH

~/.qwispr/telemetry.jsonl

Custom telemetry path

QWISPR_CALIBRATION

1.0

Reserved/unused (no runtime effect; no reader in code)

QWISPR_QPU_DRYRUN

0

Set 1 for dry-run QPU path

QWISPR_ALLOW_ABSOLUTE

0

Bypass workspace-root jail (search globs + analyze/refactor/testgen --file)

QISKIT_TOKEN

—

IBM Quantum token, reported in hardware status (hasToken); live QPU calls not implemented — set QWISPR_QPU_DRYRUN=1 for the simulated path

Architecture

┌─────────────────────────────────────────────────────────────┐
│                    SOURCE / LOCKFILE / QUBO                 │
└─────────────────────────────────────────────────────────────┘
                            │
        ┌───────────────────┼───────────────────┐
        ▼                   ▼                   ▼
┌───────────────┐   ┌───────────────┐   ┌───────────────┐
│  code-graph   │   │problem-encoder│   │  (direct QUBO)│
│  (regex AST)  │   │(branch-dist)  │   │               │
└───────┬───────┘   └───────┬───────┘   └───────┬───────┘
        │                   │                   │
        └───────────────────┼───────────────────┘
                            ▼
              ┌───────────────────────────┐
              │      ORCHESTRATOR         │
              │  nVars ≤ threshold?       │
              │  classical : quantum      │
              └───────────┬───────────────┘
                          │
          ┌───────────────┴───────────────┐
          ▼                               ▼
   ┌─────────────┐                 ┌─────────────┐
   │  CLASSICAL  │                 │  QUANTUM    │
   │  (brute n≤4)│                 │  PennyLane  │
   └──────┬──────┘                 │  • QAOA     │
          │                        │  • VQE      │
          │                        │  • Grover   │
          │                        │  • QWalk    │
          │                        │  • QSVM     │
          └───────────────┬────────┘
                          ▼
              ┌───────────────────────────┐
              │     BITSTRING + ENERGY    │
              └───────────┬───────────────┘
                          ▼
              ┌───────────────────────────┐
              │        DECODER            │
              │  patch / inputs / hits    │
              └───────────────────────────┘

Hybrid routing threshold adapts via telemetry (QWISPR_TELEMETRY=1):

  • Quantum 2× slower with no gain → threshold++

  • Quantum success rate > classical + 0.1 → threshold--

  • Clamped to [2, 8]

Ponytail Minimalism

This project follows ponytail full — minimal, stdlib-first, no unnecessary abstractions.

Shortcut

Ceiling

Upgrade Path

Manual JSON-RPC

no SDK

@modelcontextprotocol/sdk if client fails

Regex call-graph

no tree-sitter

native parser when lands

BFS ≈ QWalk

classical fallback

true quantum walk n≤8

Heuristic ReDoS guard

nested quantifier only

re2 if exposed over network

Adaptive threshold

heuristic 2×/rate

ML when >10k events/day

Every // ponytail: comment marks a deliberate ceiling with upgrade path.

Stats:

  • 0 runtime dependencies (dependencies: {})

  • ~250 lines removed via audit

  • 7 dev deps removed (chalk, ora, fast-json-patch, tree-sitter*, semver, yaml)

  • 16/16 tests pass, 0 vulnerabilities

Contributing

# 1. Fork & clone
git clone https://github.com/yourfork/qwispr
cd qwispr

# 2. Install deps
npm ci

# 3. Run checks
npm run lint      # eslint
npm run typecheck # tsc --noEmit
npm test          # vitest 16/16

# 4. Benchmarks (optional)
npm run benchmark
npm run benchmark:real

# 5. Commit (conventional commits)
git commit -m "feat: add new quantum algorithm"

# 6. PR → CI runs lint + typecheck + test + benchmark:smoke

Code style: Strict TypeScript, no any, no ts-ignore, minimal deps, ponytail ceiling comments.

License

MIT — see LICENSE for details.

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