pi-graph-viz

Interactive dependency graph visualizer for the Pi coding agent. Renders any dependency or call graph (from pi-impact-analyzer or direct JSON input) as a self-contained HTML visualization with cycle highlighting, search, and hierarchical layout.

Installation

pi install npm:pi-graph-viz

Features

• Self-contained HTML: No CDN, no external dependencies. The visualization is a single HTML file with inline CSS and SVG.
• Hierarchical layout: Nodes arranged by dependency depth (top-down or left-right).
• Cycle detection: Circular dependencies highlighted in red with a dedicated cycle panel.
• Search: Find nodes by id or label. Non-matching nodes are dimmed.
• Type filter: Filter nodes by type (file, function, class, module).
• Node details: Click any node to see its type, file, line, in-degree, and out-degree.
• Nexus integration: Reads pi-impact-analyzer JSON output directly.
• Live server: Serve the visualization on localhost with SSE auto-reload — the browser updates automatically when the graph is regenerated.

Usage

Via Tool (LLM/agent)

Render a graph from direct JSON input:

graph_viz type=json graph='{"nodes":[{"id":"a","label":"A"},{"id":"b","label":"B"}],"edges":[{"source":"a","target":"b"}]}'

Render pi-impact-analyzer output:

graph_viz type=impact output=./report.html

Options:

• output: Output path for the HTML file (default: graph-viz-report.html).
• title: Optional title for the visualization.
• direction: Layout direction, "TB" (top-bottom) or "LR" (left-right, default: "TB").
• highlightCycles: Highlight cycles in red (default: true).

Via Command (TUI)

Generate and save:

/graph-viz path/to/graph.json

Start a live localhost server:

/graph-viz serve [path-to-graph.json]

Stop the server:

/graph-viz stop

Via Tool with Live Server

graph_viz type=json graph='...' serve=true

The live server supports SSE-based auto-reload: the browser page automatically refreshes when the graph is regenerated.

The JSON file should contain:

{
  "nodes": [
    { "id": "auth", "label": "AuthModule", "type": "module", "file": "src/auth.ts" },
    { "id": "login", "label": "login", "type": "function", "file": "src/auth.ts", "line": 42 }
  ],
  "edges": [
    { "source": "login", "target": "validateToken" },
    { "source": "validateToken", "target": "db" }
  ]
}

Integration with Nexus

pi-graph-viz is part of the Nexus monorepo and pairs naturally with:

• pi-impact-analyzer: Renders its impact analysis output as an interactive graph.
• pi-smart-reader: Quick file-level dependency visualization.
• pi-audit-master: Visualize audit findings as a dependency graph.

Graph Data Types

Field	Type	Description
nodes	Array	Array of {id, label, type?, file?, line?}
edges	Array	Array of {source, target, type?, weight?}
title	string	Optional title for the visualization
metadata	object	Optional metadata key-value pairs

Node types

• file - Source file
• function - Function or method
• class - Class definition
• module - Module or namespace

Edge types

• imports - Import relationship
• calls - Function call
• extends - Class inheritance
• uses - Generic usage

Development

git clone https://github.com/ZachDreamZ/pi-graph-viz.git
cd pi-graph-viz
npm install
npm run build
npm test

Audit Report

This package has been audited by the pi-audit-master extension for code quality, security, and reliability. The full audit report is available in AUDIT-REPORT.md.

Audit Summary

Category	Issues Found	Issues Fixed
🔴 Critical	2	2 ✅
🟠 High	5	5 ✅
🟡 Medium	4	4 ✅
🟢 Low	3	3 ✅
Total	14	14 ✅

Key Improvements

• Security: Fixed signal listener removal, added XSS protection for token injection
• Reliability: Added Node.js fallback, heartbeat cleanup, error logging
• Performance: Removed redundant require() calls, optimized imports
• Maintainability: Added debug logging, improved error handling

Performance Metrics

Metric	Result
Graph Analyzer	0.05ms/analysis
Large Graph (1000 nodes)	0.78ms
HTML Generator	0.08ms/generation
Live Server	0.11ms/update

For detailed findings and recommendations, see the full audit report.

License

MIT