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Lineage Lens

Free, open-source tool to track AI-generated code from Copilot, Cursor, Claude Code & Gemini.

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Description

Free, open-source tool to track AI-generated code from Copilot, Cursor, Claude Code & Gemini. See which AI wrote each line, and flag IP/license risk.

About Lineage Lens

What is Lineage Lens?

LineageLens is an open-source, self-hosted AI code governance platform that tracks which AI tools wrote code in your repository.

What Lineage Lens does

The tool tracks lines of code produced across 11 AI coding tools including GitHub Copilot, Cursor, Claude Code, OpenAI Codex, and Gemini. It flags unreviewed code, license risks such as GPL matches, and potential security patterns. Using lineagelens blame, teams can annotate files line-by-line with the model and prompt that generated the code, while keeping all data inside their own infrastructure.

How Lineage Lens works

Developers install a VS Code extension that detects AI code insertions locally. To capture prompts and models, teams configure their AI tools to route traffic through a local proxy running on localhost:8788. The proxy records prompts and responses before forwarding requests. Data lands in a self-hosted backend powered by SQLite, PostgreSQL, or Neo4j, enabling teams to review code provenance, timelines, and audit logs.

Key features

  • Line-by-line blame: lineagelens blame annotates files line-by-line with the AI tool, model, and prompt that created each block.
  • Open-source self-hosted: licensed under MIT with all source code and prompts kept entirely within your environment.
  • Proxy capture: local proxy at localhost:8788 intercepts prompts and responses across Anthropic, OpenAI, and Gemini protocols.
  • License risk detection: flags potential license contamination including GPL and AGPL matches before deployment.
  • VS Code extension: watches multi-line insertions directly in the editor without requiring external backend servers.
  • Governance dashboard: centralized interface showing total insertions, model usage, risk distributions, and flagged files.

Facts from lineagelens.dev, checked 8 November 2026

  • LineageLens is open-source software distributed under the MIT license.
  • The software tracks code across 11 AI coding tools.
  • The Base tier is a free VS Code extension requiring no account or server.
  • LineageLens Plus costs $12 per active developer per month.
  • All prompts and code stay within the user's infrastructure without external cloud transmission.

Written from Lineage Lens's own website (Homepage). The maker can claim this listing to edit it.

Categories

AI & Machine LearningDeveloper ToolsOpen Source

Frequently asked questions

What is LineageLens?

LineageLens is an open-source, self-hosted AI code governance and provenance platform that tracks which AI tools generated specific lines of code, the prompts used, and associated risk levels.

Does LineageLens send code or prompts to external servers?

No. LineageLens is entirely self-hosted. All data, including prompts, code insertions, and metadata, remains on your local machine or within your organization's own infrastructure.

How does the local proxy capture AI prompts?

The local proxy runs at localhost:8788, parsing provider protocols including Anthropic tool_use, OpenAI apply_patch, and Gemini functionCall, then forwarding requests untouched.

How much does LineageLens cost?

The Base VS Code extension and Lite Docker backend are free and open-source. LineageLens Plus costs $12 per active developer per month, and Max offers custom enterprise pricing.

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